CN1191335C - Steam generator for gasifying coal - Google Patents

Abstract

A combined, integral steam generator coal gasifier includes a vertically elongated, all welded, gas tight enclosure with a burner zone having a double pitch sloping furnace floor and a slag tap extending therethrough. Successive zones located above the burner zone are provided with appropriate tube materials for conveying synthesis gas produced by the coal gasification process. A multi-pass convection pass zone having upflow and downflow passes is locted at an upper portion of the enclosure and contains a plurality of superheater (primary and secondary) as well as economizer heating surfaces which extract heat from the synthesis gas to produce steam. An ash remover is connected to the outlet of the convection pass zone to remove ash from the synthesis gas exiting from the convection pass zone. The slag tap located at the bottom of the burner zone communicates with a slag tank or a submerged drag chain deasher for receiving and removing slag from the burner zone.

Description

Steam generators for gasifying coal

Background of the invention

1. Field of invention

The present invention relates generally to coal gasifiers, and more particularly to a novel and practical combined integrated steam generator-coal gasifier for converting coal into useful gaseous products, while generating steam for power generation and/or Steam required for the process.

2. Description of related technologies

Figures 1-6 illustrate various known coal gasifier configurations with various structures, system components and connections.

In 1951, Babcock and Wilcox (B&W) supplied the U.S. Bureau of Mines in Morgantown, West Virginia with an atmospheric pressure, oxygen or steam blown, slag-type, entrained flow coal gasifier. Figure 1A shows the device. In addition, B&W also provided a pressurized oxygen and steam blowing, slagging type, entrained flow coal gasifier to the US Bureau of Mines in Morgantown, West Virginia, as shown in Figure 1B. In the early 1950s, B&W supplied E.I. DuPont de Nemours (DuPont) in Belle City, West Virginia with a semi-commercial scale, atmospheric pressure, oxygen and steam blown, slagging-type, entrained flow coal gasification A gasifier, shown in Figure 2, was subsequently provided in the same place with a commercial scale coal gasifier, shown in Figure 3. In the mid-1950s, B&W conducted engineering studies and experimental work on air-blown, slagging-type, entrained-flow gasification for gas turbine-steam turbine combined cycles. This led to a joint project with General Electric, where a coal gasifier (see Figure 4) was operated at B&W's joint research center for more than 3 years (in the 60s). In 1976, B&W built a coal gasifier for a dual-gas pilot plant in Hormer, Pennsylvania. The project was sponsored by the US Department of Energy, as shown in Figure 5. In the 1980s, B&W also participated in a joint venture project with Koppers and established KBW Gasification Systems Co., Ltd. KBW coal gasifier and its auxiliary equipment are shown in Figure 6. These techniques and designs are the basis of the present invention.

Summary of the invention

The present invention relates to a new, integrated integrated steam generator-coal gasifier for the conversion of coal into useful gaseous products, in particular synthesis gas, while generating steam which can be used for power generation and/or for process needs . Compared with any previous design, this integrated steam generator-coal gasifier has unexpected and very practical advantages.

Accordingly, an aspect of the present invention is to provide an integrated steam generator-coal gasifier which can generate steam using heat generated in a coal gasification process while producing synthesis gas from coal. This integral steam generator-coal gasifier has a vertically elongated, all-welded, gas-tight enclosure with walls made of membrane-walled tube panels, which give it a subcritical Design for natural circulation. The coal gasification process takes place within the shell and produces hot syngas and heat that is transferred to the water and steam flowing through the tube sheets. The casing conveys hot synthesis gas from its lower burner region to an outlet. In the area of the burner, a double-slope inclined furnace bottom plate and a slag outlet penetrating the bottom plate are arranged so as to remove the slag generated during the coal gasification process. A corrosion-resistant zone is provided above the burner zone and an upper cooling zone is provided above the corrosion-resistant zone.

Advantageously, the shell walls of the corrosion resistant zone comprise one of bimetallic and/or composite membrane tube panels, while the shell walls of the upper cooling zone may comprise only carbon steel membrane tube panels. A multi-pass convective runner region is disposed above the upper cooling region, the multi-pass convective runner region defining a region containing heated surfaces capable of extracting heat from the syngas as it flows therealong. Preferably, the convective flow channel region includes an upflow channel and a downflow channel for conveying synthesis gas from the upper cooling zone to the outlet. Heated surfaces in the convective runner area include superheater surfaces and economizer surfaces for extracting heat from the synthesis gas. The superheater surface includes the auxiliary superheater surface and the main superheater surface located in the upflow channel and the economizer surface located in the downflow channel. Portions of the main superheater can be located in both the upflow runner and the downflow runner; specifically, the inlet train of the main superheater can be located on top of the downflow runner, while the outlet train of the main superheater can be located in the top of the upflow runner. Finally, an ash removal device is provided connected to the outlet of the convection channel area to separate ash from the synthesis gas exiting the convection channel area, while the slag removal device is connected to the slag outlet to receive the Area slag.

Another aspect of the invention relates to a structure in which the sloping furnace floor and walls of the combustion zone are formed from finned tubes having a pattern of dowels covered with refractory material. Preferably, the finned tubes are multi-directional tubes.

Various proven techniques can also be used to predict and simulate this coal gasifier, especially for the burner flame, furnace temperature and gasification reaction. Specifically, these modeling techniques will affect the design structure of the burner and burner zone.

A further aspect of the invention therefore concerns the arrangement and orientation of the burners relative to the walls through which they burn, ie the walls respectively associated with them. In general, the offset burners are preferably located at two levels in the burner region and arranged to fire inwardly through the walls of the enclosure. The term "offset" means that one burner on one wall is not directly facing another burner on the opposite wall. Each offset burner is disposed through the wall of the enclosure at an angle 9 with respect to a vertical line of the enclosure wall, the angle θ being in the range of approximately 0° to 25°. Preferably, the angle θ is a non-zero value of about 15 degrees to 25 degrees.

In addition, not only are the offset burners arranged at at least one level in the burner area, each burner is arranged and arranged to burn inwardly through a wall of the housing, but each burner is located in its corresponding The distance from one corner of the housing to the wall of the wall is about one-fifth to one-third of the width of the corresponding wall. This, together with an appropriate value of θ, creates eddy currents within the enclosure that enhance the coal gasification process.

Another aspect of the present invention is the dual-slope inclined furnace floor, which preferably includes a plurality of K-shaped forgings that connect the tubes forming the inclined furnace floor and connect them in fluid communication with the header below the inclined furnace floor. In general, each K-shaped forging mechanically connects two tubes from the front and rear walls of the enclosure.

The novel features of the invention are pointed out in the claims annexed to and forming a part of this application. In order to better understand the present invention, its operating advantages and benefits obtained by using the present invention, the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.

Brief description of the drawings

In the attached drawings:

Figure 1A is a side view of a known atmospheric pressure coal gasifier structure provided to the US Bureau of Mines;

Figure 1B is a side view of a known pressurized coal gasifier structure provided to the US Bureau of Mines;

Figure 2 is a view similar to Figures 1A and 1B showing a known semi-commercial scale, atmospheric pressure coal gasifier configuration provided to DuPont;

Figure 3 is a perspective view, with portions cut away, of a known commercial scale, atmospheric pressure coal gasifier construction provided to DuPont.

Fig. 4 is a perspective view of another coal gasifier structure involving gas turbine-steam turbine combined cycle, which is jointly researched and tested with General Electric Company, with some parts cut away.

Fig. 5 is a longitudinal sectional view of a known coal gasifier structure developed for the U.S. Department of Energy's dual-gas pilot plant in Homer, Pennsylvania;

Figure 6 is a perspective view of a known, more mature coal gasifier configuration with flue bridges between the separate coal gasifier and heat recovery sections;

Fig. 7 is a longitudinal sectional view of a combination type integrated steam generator-coal gasifier device according to the present invention;

Fig. 8 is a top plan view of a multiple steam generator-coal gasifier arrangement of the type shown in Fig. 7, showing one possible arrangement in which two steam generator-coal gasifiers are arranged side by side;

Fig. 9 is a sectional view taken along arrow 9-9 in Fig. 7, showing another alternative embodiment of the steam generator-coal gasifier, wherein the burners are relative to the wall of the casing through which they pass ( ie with their associated walls) at an angle;

Fig. 10 is an enlarged cross-sectional view of the lower part of the steam generator-coal gasifier in Fig. 7, showing a double-slope inclined furnace floor structure, which adopts a "K"-shaped forging of the bottom plate of the slag outlet, and will form each root of the inclined furnace floor The tubes are mechanically and fluidly connected to each other;

Figure 11 is a partially enlarged view of a single slag outlet "K" shaped forging of the type shown in Figure 10;

Figure 12 is a left side view (viewed in the direction of arrow 12-12) of the slag outlet "K"-shaped forging shown in Figure 11, showing how multiple slag "K"-shaped forgings are staggered and related to them How the furnace floor tubes are assembled next to each other to form a double-slope inclined furnace floor; and

Fig. 13 is a top plan view seen in the direction of arrow 13-13 in Fig. 12 .

Detailed description of the preferred embodiment

Please refer generally to the drawings, wherein like reference numerals designate functionally identical or similar parts, particularly in FIGS. coal gasifier. The steam generator-coal gasifier 10 employs various components derived from the prior art, but forms a new, new and unexpected structure with unexpected advantages over any existing structure alone or in combination. Favorable combinations and configurations.

As shown in Figure 7, the steam generator-coal gasifier is an atmospheric pressure, oxygen-blown (or oxygen-containing gas, or such as steam, air, oxygen-enriched air, carbon dioxide, or similar) designed coal gasifier. Synthesis gas 12 can be further refined and made into, for example, ammonia, for the production of industrial feedstocks such as fertilizers, methanol, CO, chemicals and explosives. Although Fig. 7 only shows a single steam generator-coal gasifier 10, those skilled in the art should understand that two or more steam generator-coal gasifiers can be used in a certain set of equipment. device 10. FIG. 8 shows this situation, where there are two steam generator-coal gasifiers 10 arranged side by side. The design of this integrated steam generator-coal gasifier 10 combines various proven technologies with each other in a new combination to meet the design purpose.

The integrated steam generator-coal gasifier 10 of the present invention includes the following features:

- a fully welded airtight enclosure 14;

- by means of a refractory overlay in the burner area 16 and on the double-slope inclined furnace floor 18, and preferably by means of K-shaped forgings and multi-ribbed finned tubes in the inclined furnace floor 18 to form a densely spaced pin pattern;

- the slag opening 20 located on the inclined furnace floor 18 comprises a slag neck (slag neck) 22;

- corrosion resistant zone 24 above the burner zone 16 and use of bimetallic/composite membrane tubes with a transition to less expensive carbon steel pipe in the upper cooling zone 26 above the corrosion resistant zone 24;

-A standard B&W drum boiler RB-El Paso ^TM furnace shell and multi-channel convection runner 28 design with standard B&W RB-El Paso ^TM structural supports and appropriate corrosion protection, whereby Locating standard secondary superheater (SSH) 30, primary superheater (PSH) 32, and economizer (EC) 34 heating surfaces within the "footprint" of furnace shell 14 reduces equipment footprint requirements ;

- Prediction of gasification reaction and furnace temperature is adopted;

- Furnace wall seal configuration for sootblower and convective surface penetration, facilitating airtight and reliable operation;

- Predict burner flames and specific flow patterns analogously and predict the interaction of individual burner flames using computer flow diagrams (CFD); and

- Bottom ash removal using proven slag bins 36 or submerged drag chain conveyors 38 . The submerged drag chain conveyor also acts as a pressure seal against gas leaks in the furnace.

Advantages of the present invention include providing a safe and reliable plant solution for industries requiring synthesis gas production, using components that have been proven by previous use, not necessarily by the combination or configuration of the present invention. The present invention also uses computer simulation to determine the gasification reaction, and CFD simulation to determine the furnace flame pattern, the design structure and placement of the burner, and the shape of the furnace temperature curve. Advances in this technical field have not been used in coal gasifier design in the past.

The present invention provides a fully water-cooled, gas-tight enclosure 14 from the burner zone 16 to the outlet 40 of the multi-channel convective runner zone 28 . This structure eliminates the need for crossover flues required by the previous coal gasifier design (as shown in Figure 6), thereby simplifying the mechanical structure and reducing maintenance requirements while forming a reliable and compact design structure.

Through the use of pin/refractory materials, bimetallic and/or composite pipes, and proper selection of materials for the convective surfaces, the present invention can also generate higher working steam temperatures and pressures, resulting in higher steam cycle efficiencies.

As shown in Figures 7 and 8, an upright elongated, all-welded, gas-tight enclosure 14 has four walls made from a number of tubes forming membrane-walled tube panels of known construction. From the bottom up, the housing 14 includes several regions: the burner region 16 , the corrosion resistant region 24 , the upper cooling region 26 and the multi-runner convective runner region 28 . The coal gasification process to produce synthesis gas 12 takes place within the shell 14, mainly in the burner zone 16, the corrosion resistant zone 24 and the upper cooling zone 26, and generates transferable heat and produces flow through the membrane walls forming the shell 14 The mixture of water and steam in the tube panel, this mixture of water and steam has a density difference with the water in the downcomer, which makes the membrane fireplace panel to be cooled by natural circulation. The housing 14 conveys the syngas 12 to an outlet 40 of the multi-channel convective flow channel region 28 . At the bottom of the burner zone 16 there is provided a double-slope furnace floor 18 with a slag opening 20 passing through it, which is connected to a slagging neck 22 . The tap neck 22 connects the tap opening 20 to a tap box 36 or, preferably, to a submerged drag chain conveyor 38 .

The sloped furnace floor 18 and walls of the burner area are preferably covered with a dense pattern of pins which is then covered with a layer of refractory material to protect the tubes from the corrosive environment. The pin pattern is such that the pins pass through the refractory for heat transfer. In addition, the sloped furnace floor 18 and the walls of the combustion zone are preferably made of multi-ribbed finned tubes to enhance heat transfer characteristics and prevent heat flow over these tubes from causing them to overheat and fail.

7-9, in the burner area 16, each offset burner 42 is arranged on two heights, at least one (preferably two) has a shooting angle, and four walls of the casing are provided with through Its flame-breathing burner. The term "offset" means that the burners 42 on one wall are not directly facing the burners 42 on the other wall. Each burner 42 is arranged to burn through the wall of its associated housing 14 at an angle θ with a line 41 perpendicular to the wall of about 0° to 25°, preferably between about 15° and Between 25 degrees.

The distance D of each burner on its associated wall to a corner 43 of the casing 14 is from one fifth to one third of the width W of the associated wall. Together with an appropriate value of θ, a flame vortex can be formed within the enclosure 14 to enhance the coal gasification process used to produce synthesis gas 12 .

According to the sequence of synthesis gas 12 flowing from the combustion zone to the outlet 40, above the combustion zone 16 is: a corrosion-resistant zone 24, which preferably has a shell wall made of bimetallic and/or composite tubes; an upper cooling zone 26, which Carbon steel pipes may be used; and a multi-channel convective flow channel region 28 which defines a region containing heated surfaces which extract heat from the synthesis gas 12 as it flows over these heated surfaces. The multi-pass convective runner region 28 includes an upflow runner 44 and a downflow runner 46 for conveying the syngas 12 from the upper cooling region 26 to the outlet 40 . Various heated surfaces within convective runner region 28 , including surfaces of superheaters (secondary superheater (SSH) 30 and primary superheater (PSH) 32 ) and economizer (EC) 34 , are used to extract heat from synthesis gas 12 . The surfaces of SSH30 and PSH32 are located in the upflow channel 44 , while the surfaces of EC34 are located in the downflow channel 46 . A part of the PSH32 can be located in both the upflow channel 44 and the downflow channel 46; in particular, one or more columns of inlets of the PSH32 can be arranged on top of the downflow channel 46, while one or more columns of the PSH32 An outlet may be provided at the top of the upflow channel 44 .

The respective tubes of the rear wall 48 of the housing 14 bifurcate upward at 50 to form a plurality of upflow channels 44 and downflow channels 46 within the convection channel region 28 . This design feature, an aspect of B&W's El Paso ^™ type radiant boiler, eliminates the pendant convection channels and includes upflow channels 44 and downflow channels 46 within the footprint of the boiler shell 14 . Accordingly, some of the tubes forming the rear wall 48 are bent inwardly out of the plane of the rear wall 48 to form a dividing wall 52 separating the upflow channel 44 and the downflow channel 46 . However, synthesis gas 12 can pass from upflow channel 44 to downflow channel 46 due to further bending of some of the tubes forming wall 52 to form channels in the top of shell 14 . Similarly, as the synthesis gas 12 flows down through the downflow channel 46, some of the tubes that form the rear wall 48 and continue straight along the plane of the rear wall 48 also bend to form channels that allow the synthesis gas 12 to diverge from the fork. The outlet 40 discharge channel near the position 50 is also similar to the structure of the "B&W El Paso ^TM type boiler. The convection surface tube bundle is supported by the groove in the baffle wall, so that the elbow is hidden in the recess and can Minimizes erosion and corrosion effects.

All coils of the superheaters 30, 32 are arranged to drain water to prevent possible damage to the steam generator-coal gasifier 10 during start-up. The PSH 32 is arranged counter-currently to the flow direction of the synthesis gas 12 to minimize the surface area required for heat transfer. SSH 30 is arranged partially parallel to the flow of forming gas 12 to minimize metal temperature and tendency to corrode. The convective runner surfaces are also arranged to minimize the velocity of the gases, thereby reducing the risk of potential corrosion damage associated with the high ash nature of this type of combustion process.

The steam generator-coal gasifier 10 also includes a steam drum 54 . The conduit 59 leads from the steam drum 54 to the lower header 56 of the membrane tube panel of the shell 14 of the steam generator-coal gasifier 10 (see FIG. 10 ), and other conduits lead from the upper header of the shell 14 and return to the steam drum 54 . Due to the properly sized ducts and headers, natural circulation can be relied upon to cool the furnace walls without the need for a circulation pump.

The inlet of the EC 34 is connected to a boiler feed water supply pipe (not shown), while its outlet is connected to a pipe leading to the steam drum 54 . The steam drum 54 also has a liquid level control arrangement known in the art. As is also well known in the field of boiler technology, a steam pipe leads from the top of the steam drum 54 to the inlet of the PSH32, and a pipeline leads from the outlet of the PSH32 to the inlet of the SSH30. The pipeline is provided with a water spray desuperheater (not shown), and a boiler feed water pipe leads from the boiler feed water pipe to the water spray desuperheater or other temperature control devices, such as a condenser. A superheated steam pipe leads from the outlet of the SSH to the boundary of this facility. It is thus possible to draw superheated steam of approximately 60 bar from this pipe. A temperature control device may be provided between this pipe and the pipe supplying the boiler feed water to the sprinkler desuperheater.

Pulverized coal is fed to the burners 42 within the burner zone 16 by suitable coal feeders (not shown) and pulverizers (also not shown). Carbon dioxide constitutes the pneumatic transport medium that can pneumatically transport pulverized coal from a supply point to the burner. Each burner 42 is also provided with an oxygen supply pipeline. The steam generator-coal gasifier 10 also includes a nitrogen supply device equipped with a blower for purging the system when the system is started/shut down.

In operation, each burner 42 is pneumatically supplied with pulverized coal at a controlled rate using carbon dioxide as the delivery medium. A control device (not shown) can control the flow of carbon dioxide to a fixed value. Pulverized coal is delivered to each burner 42 through a flow control gate and a flow rate metering device or arrangement. The pulverized coal is fed into a stream of carrier gas (such as carbon dioxide) which then carries the pulverized coal to each burner 42 . Simultaneously, oxygen is supplied to the burner 42 along the flow line. The burners 42 are preferably of the so-called diffusion type, but may also be of the premixed type, in which the combustion of oxygen and pulverized coal takes place inside the casing 14 of the steam generator-coal gasifier 10 . The slag whose temperature is usually about 1400° C. is quenched and hardened by the double-slope inclined furnace floor 10 , the slag outlet 20 , the slag neck 22 and the slag box 36 or the drag chain conveyor 38 and dragged out.

The combustion reaction of pulverized coal and oxygen in the shell 14 produces gaseous components including carbon monoxide and hydrogen and slag. More specifically, a sub-theoretical ratio of oxygen is utilized. Coal is first burned with oxygen to generate high temperature carbon dioxide and water vapor. These gases then react with the rest of the coal to produce carbon monoxide and hydrogen. The gaseous components (ie, synthesis gas 12 ) exit housing 14 through outlet 40 as a product gas (temperature typically about 200° C.) and pass through cyclone 58 .

Referring now to Figures 10-13, another feature of the present invention that has heretofore not been utilized in gasifier design is the double sloped sloped furnace floor 18 which preferably includes a plurality of K-shaped forgings 60 which will A number of tubes forming the inclined furnace floor 18 are connected and bring them into fluid communication with a manifold or header 56 below the inclined furnace floor 18 . In general, each K-shaped forging 60 joins two tubes from opposing front and rear walls of the housing 14 to form a double-slope inclined furnace floor 18 . Each K-shaped forging 60 has flat sides to facilitate offsetting and welding multiple tap "K" forgings together to assemble their associated floor tubes next to each other to form a double ramp Furnace floor 18. This special type of K-shaped forging is used for a different type of environment, namely the cyclone furnace environment. For a typical cyclone boiler, B&W recommends a 24" x 36" floor tap, which is larger than the original 18" x 24" floor tap. The increase in size of the floor slag outlet is to accommodate western high ash coals and/or coals with high ash melting temperatures. While Western coals typically have a low ash percentage, the low radiant heat of combustion and ash properties combine to produce a very viscous slag, which can lead to bridging and sealing of the floor taps. The double-slope inclined furnace floor 18 with K-shaped forgings 60 is actually a construction for a supercritical pressure cyclone boiler floor, not a B&W El Paso ^TM type drum boiler.

The heat generated by combustion in the shell 14 is directly used to heat (that is, not be cooled by any water) the boiler feed water flowing along the boiler feed water pipe of the shell 14 to generate about 60 bar of steam, which in turn heats the boiler continuously entering the EC34 Water is fed and steam from steam drum 54 is superheated in PSH32 and SSH30.

The flow configuration sets the oxygen flow to meet the required useful gas flow, which can be measured by means of measuring devices known in the art for carbon monoxide and hydrogen in gas products. The control configuration can also adjust the coal to oxygen ratio to maintain the desired carbon dioxide concentration in the gas product being produced.

In this steam generator-coal gasifier 10, all waste heat is recovered as high-pressure superheated steam without additional water cooling. The synthesis gas exiting the cyclone 58 may be scrubbed and dedusted if desired. The pressure drop of the steam generator-coal gasifier 10 is set such that the synthesis gas 12 can be delivered at the required pressure without the need for a booster blower.

This steam generator-coal gasifier 10 can be used in the manufacture of any chemical that feeds carbon monoxide and/or hydrogen or both. Such chemicals include ammonia and its derivatives, methanol and its derivatives, acetic acid and its derivatives, and more. The steam generator-coal gasifier 10 may also form at least part of an integrated power plant.

It is believed that in the steam generator-coal gasifier 10, more than 85% of the theoretical waste heat produced can be recovered as high-pressure superheated steam suitable for driving a steam turbine, where the theoretical waste heat is defined as the input steam generator-coal gasification The heating value of the coal in the gasifier 10 is less than the heating value of the gas, fly ash and slag exiting the gasifier.

It is also believed that the steam generator-coal gasifier 10 converts coal to gas at a higher rate than known gasifiers, thereby producing less fly ash. Furthermore, such a steam generator-coal gasifier 10 allows a significant reduction in electricity consumption compared to known production processes in which the product gas is quenched in the steam generator-coal gasifier 10 and does not require a feedstock for the quenching The gas consumes water, and the safety of the production process is also improved.

In addition, the gas produced in the steam generator-coal gasifier 10, which may contain highly corrosive components, can be kept in a fully water-cooled enclosure 14 until the temperature of the synthesis gas 12 has dropped below a temperature that could cause corrosion . By choosing an appropriate working pressure, the temperature of the housing 14 itself can be kept at the boiling temperature of the water in the furnace wall of the steam generator-coal gasifier 10 . To this end, the furnace walls of the steam generator-coal gasifier 10 may be constructed of suitable materials, which may be materials commonly used for the construction of modern high-pressure industrial boilers.

While the application of the principles of the invention has been illustrated and described in detail in connection with the particular embodiment, it should be understood that the invention may be embodied in other ways without departing from the spirit of the invention.

Claims (19)

1. A kind of integrated steam generator-coal gasifier, which is used to generate steam by means of the heat generated by the coal gasification process while producing synthetic gas from coal, which includes: A vertically elongated, all-welded, gas-tight enclosure having walls made of multiple membrane-walled tube panels within which the coal gasification process occurs and produces hot synthesis gas; heat is transferred to the stream Water and steam mixture passing through each tube sheet, said shell can transport hot synthesis gas from a burner area in its lower part to an outlet; A burner zone constructed and designed to withstand the corrosive and erosive environment created by the gasification process, comprising at least one burner zone offset in height, each burner positioned and arranged to burn separately through the walls of the enclosure; A double-slope inclined furnace floor, which is located at the bottom of the burner zone and has a slag tap through the floor; a corrosion-resistant zone located above said burner zone; an upper cooling zone located above said corrosion resistant zone; a multi-channel convective flow region above said upper cooling region, which region forms a region containing heated surfaces capable of extracting heat from the syngas as it flows therealong; an ash removal device connected to the outlet of the convective channel area for separating ash from the synthesis gas discharged from the convective channel area; and A slag removal device communicated with the slag outlet for receiving slag from the burner area. 2. The steam generator-coal gasifier according to claim 1, further comprising a slagging neck connected to the slagging outlet. 3. The steam generator-coal gasifier according to claim 2, wherein the slag removal device comprises a slag discharge box and a submerged drag chain conveyor connected to the slag discharge neck. 4. The steam generator-coal gasifier of claim 1 wherein said sloped furnace floor and burner zone walls comprise a pattern of pins covered by refractory material. 5. The steam generator-coal gasifier according to claim 1, wherein said ash removal device comprises a cyclone separator device connected to the outlet of said convective channel area. 6. The steam generator-coal gasifier according to claim 1, wherein the shell wall of the corrosion-resistant zone comprises a bimetallic and/or composite membrane tube panel. 7. The steam generator-coal gasifier according to claim 1, characterized in that, the shell wall of the upper cooling area comprises a carbon steel membrane tube panel. 8. The steam generator-coal gasifier according to claim 1, wherein the convective channel area includes an upward flow channel and a downward flow channel for cooling the synthesis gas from above The area is conveyed to the outlet. 9. The steam generator-coal gasifier of claim 1, wherein said heating surfaces in said convective flow path region include superheater and economizer surfaces for extracting heat from synthesis gas. 10. The steam generator-coal gasifier according to claim 9, characterized in that, the superheater surface includes a secondary superheater surface and a main superheater surface in the upward flow channel, and a surface in the downward flow channel Economizer surface. 11. The steam generator-coal gasifier according to claim 1, characterized in that the inclined furnace floor and the wall of the burner area are made of finned tubes with refractory materials on them The covered pin pattern. 12. The steam generator-coal gasifier of claim 1, wherein each offset burner is arranged to pass through the enclosure at an angle θ with respect to a perpendicular to the enclosure wall in which it is located For wall combustion, the angle θ is in the range of 0 degrees to 25 degrees. 13. The steam generator-coal gasifier according to claim 12, wherein the angle θ is in the range of 15 degrees to 25 degrees. 14. The steam generator-coal gasifier as claimed in claim 1, characterized in that, it comprises at least one burner offset along the height direction in the burner area in the burner area, and each burner is set and Arranged to burn through respective walls of the enclosure, each burner is located on the wall at a distance from one-fifth to one-third of the width of the wall from a corner of the enclosure. 15. The steam generator-coal gasifier according to claim 1, wherein the double-slope furnace floor includes the multi-K-shaped forgings, which fluidly connect the tubes forming the inclined furnace floor to the inclined furnace floor. Header under furnace floor. 16. The steam generator-coal gasifier of claim 15, wherein each K-shaped forging mechanically connects two tubes forming the inclined furnace floor. 17. A method of producing steam from heat generated by a coal gasification process while producing synthesis gas from coal comprising the steps of: Coal is fed into the combustion zone below a vertically elongated, fully welded, gas-tight enclosure; Provide an oxygen-containing fluid supplied in such an amount that it reacts with coal in a suboptimal manner to produce hot synthesis gas; transfer of heat from the hot synthesis gas to the water and steam mixture in the shell wall tubes; The hot synthesis gas is continuously sent up through a corrosion resistant zone and an upper cooling zone, then up and down through a multi-pass convective runner zone with superheater and economizer heating surfaces for further extraction from the hot Syngas recovery of heat; and The ash is removed from the hot synthesis gas after it exits the outlet in the convective runner area. 18. The method of claim 17, further comprising the step of conveying hot synthesis gas upwardly through the upflow channel of the convection channel region and through the secondary superheater and the primary superheater The heated surface of the economizer, then down through the downflow runner in the convection runner area and over the heated surface of the economizer. 19. The method of claim 17, further comprising the step of: providing a partition wall made of water and steam delivery pipes in the upper portion of the housing of the multi-channel convection zone to separate A portion of the superheater heating surface is separated from the economizer heating surface, thereby creating upflow channels and downflow channels for the continuous delivery of synthesis gas.

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