CN116510601A - Heat recovery process and recovery device thereof - Google Patents

Abstract

The invention provides a heat recovery process, which comprises the following steps: stirring the materials and a pressure closed container, and transferring the heat of the materials to the pressure closed container; sieving the material subjected to heat transfer and the pressure closed container; heat recovery is carried out on the pressure closed container with heat; the heat recovery device comprises a material conveying device, a pressure container conveying device, a mixing device, a screening device and heat recovery equipment; the invention can effectively recover heat, for example: in the process of cooling solid materials such as wet quenching, vapor generated in the water gasification process is taken away and lost into the atmosphere, and the process investment can be reduced, so that the operation cost is reduced, the industrialized popularization and application of the process are enlarged, the industrialized application occasions are more, the consumption in the production process can be reduced, the environmental pollution is reduced, and the effective utilization of resources and energy sources is realized.

Description

A heat recovery process and its recovery device

technical field

The application relates to the technical field of chemical equipment, in particular to a heat recovery process and a recovery device thereof.

Background technique

Enterprises must carry out energy-saving technological transformation, reduce carbon footprints, and reduce carbon dioxide emissions. However, in many areas of existing technologies, there is a problem that heat is difficult to recover:

In the field of coke production, the temperature of coke out of the coke oven is relatively high, at 800-1000 ° C, which contains huge energy. Coke is an important raw material for making steel. By removing the volatile part in coal (usually about Accounting for 25% of the mass of coal) to produce coke, the ideal is to recapture and utilize the hot waste gas generated in the coke manufacturing process. The coke treatment process in the prior art is mainly wet quenching and dry quenching Coke; Wet coke quenching is the oldest coke quenching method adopted by the iron and steel industry. Its principle is very simple, that is, to use a large amount of water to spray on the red coke just out of the furnace to achieve the effect of extinguishing coke. The old wet coke quenching method The outdated technology of spraying water with openings on the pipes, the spray holes are frequently blocked, the coke quenching time is long, the moisture is high, and the coke is red when it is short. After coke quenching, the coke strength and moisture are not stable enough, and in the wet coke quenching In the process, it is taken away by the steam generated in the water gasification process and lost to the atmosphere; dry coke quenching is an important energy-saving and environmental protection technology in the iron and steel industry, and it is a coke quenching technology that replaces wet coke quenching. The gas (or waste flue gas) is used as the circulating gas to exchange heat with the hot coke in the dry quenching furnace, cooling the temperature of the coke from 1000°C to below 250°C to achieve the purpose of coke quenching, and the circulating gas that has absorbed the heat of the coke will transfer the heat Pass it to the waste heat boiler to generate medium-pressure (or high-pressure) steam, and the cooled inert gas is blown into the dry quenching furnace by the circulating fan. The dry coke quenching technology can improve the quality of coke and avoid environmental pollution by wet coke quenching and recovery of red coke sensible heat, which can play a dual role in energy saving and environmental protection; dry coke quenching has many benefits, but the construction cost of dry coke quenching tower is high, the operation cost is difficult to obtain technology, and traditional coking enterprises invest in technical transformation The amount is relatively large, which limits its industrial application.

In the field of semi-coke, the process of turning coal into semi-coke is mainly dry distillation (pyrolysis). After pyrolysis, part of it becomes flue gas, and the rest is further heated and carbonized into blue at a high temperature of 500 to 600 degrees Celsius. Charcoal, tar and gas all come from volatilized flue gas, which needs to be washed and cooled with water to remove impurities and recover coal tar. This process produces a large amount of waste water; after the carbonization of semi-coke is completed, it needs to be cooled as soon as possible to avoid further combustion, and the process of coke quenching of semi-coke also generally adopts a wet method, which not only produces a large amount of waste water containing phenol, but also wastes heat and consumes water. It has increased a lot; some directly soak the semi-coke in the waste water, and use the waste water to cool the semi-coke with a temperature of 500 or 600 degrees Celsius. When the semi-coke absorbs most of the waste water and vaporizes part of the waste water, there is not much waste water left. The temperature of semi-coke has also dropped. This process is called "water bubble coke quenching" and "water fishing coke". This extensive process has achieved "zero discharge" of wastewater. However, semi-coke absorbs pollutants in wastewater , known as "pollution transfer"; under the background of double carbon, reducing the consumption of the production process and realizing the effective utilization of resources and energy has become the mainstream technology development trend. Therefore, it is necessary to improve the above technical solutions, which will neither cause pollution It can also effectively recover heat.

In the iron and steel industry and the cement industry, there is also the heat recovery problem of high-temperature solids. For example, in the patent CN210636002 U, a kettle-type air heat carrier method heat recovery device is proposed to recover the heat of steel slag through hot air, but the heat capacity of the gas is low. , high circulating air volume and high economic investment and operation costs; Chinese patent 201310566022. , 201510617368.7, and 201510618002.1 disclosed the waste heat recovery method of arranging heat exchange tubes between the bottom shell of the water cooler and the clinker channel; Ratio and efficiency need to be improved.

Therefore, it is necessary to provide a new technical solution to solve the above technical problems, which can not only effectively recover heat, but also reduce pollution and ensure lower cost.

Contents of the invention

A heat recovery process, characterized in that it comprises the following steps:

The material is contacted and stirred with the pressure-tight container, and the heat of the material is transferred to the pressure-tight container;

Screening of materials and pressure-tight containers after heat transfer;

Heat recovery from pressure-tight containers with heat.

As a preferred solution, a heat recovery process further includes the following step: recovering the pressure airtight container after heat recovery into the airtight container storage part.

As a preferred solution, at least one of steam generator, heat carrier furnace and heat conduction oil furnace can be used to recover heat from the pressure-tight container with heat.

As a preferred solution, a heat carrier with high heat capacity is placed in the pressure-tight container.

As a preferred solution, the recovered heat range is 200-1300°C.

As a preferred solution, the contact stirring method between the material and the pressure-tight container is one of a drum type and a closed space vibration contact type.

The present invention also provides a heat recovery device, comprising:

Material conveying device: used for conveying materials;

Pressure vessel conveying device: used for conveying airtight containers with pressure;

Mixing device: used to stir the material and the pressured closed container, and transfer the heat of the material to the closed container;

Screening device: used for screening the material after heat transfer and the closed container with pressure;

Heat recovery equipment: recover the heat of a pressure-closed container.

As a preferred solution, a transmission device is provided at the outlet of the heat recovery device, and the transmission device is connected to the storage part of the airtight container.

As a preferred solution, the material of the airtight container is one of carbon steel, alloy steel and silicon carbide.

As a preferred solution, the airtight container adopts one of spherical, long cylindrical and elliptical shapes; spherical, long cylindrical and elliptical shapes have good pressure resistance and large contact and heat transfer areas.

As a preferred solution, the airtight container includes a cylindrical body, and two ends of the cylindrical body are provided with sealed elliptical heads.

As a preferred solution, a heat carrier is placed in the airtight container.

As a preferred solution, the heat carrier adopts one of water, heat transfer oil or molten salt.

As a preferred solution, the heat recovery equipment adopts at least one of a steam generator, a heat carrier furnace, and a heat conduction oil furnace.

The heat recovery process and heat recovery device of the present invention use the dispersed pressure airtight container to directly stir and mix with the high-temperature material, transfer the heat of the material to the pressure airtight container, and design according to the temperature difference and heat transfer efficiency of heat recovery Set a certain contact time; as the temperature rises, the pressure in the container will rise, but it will not exceed the maximum pressure allowed by its design. After the heat is transferred to the closed container, it will be separated from the material. After separation, the pressured closed container into the steam generator for heat recovery.

The invention can effectively recover heat, for example, it can avoid being taken away by the steam generated in the water gasification process and lost to the atmosphere in the process of wet coke quenching; the invention can also reduce the process investment and reduce the operating cost Reduce, thereby expanding its industrialization application, so that there are more occasions for its industrialization application, it can reduce the consumption in the production process, reduce environmental pollution, and realize the effective utilization of resources and energy.

Description of drawings

Fig. 1 is the structural representation of heat recovery device;

Figure 2 is one of the structural schematic diagrams of the airtight container;

Fig. 3 is a structural schematic diagram of angle 1 of a specific structure of the heat recovery device;

Fig. 4 is a structural schematic diagram of angle 2 of a specific structure of the heat recovery device;

1. Material conveying device 2. Pressure vessel conveying device 3. Airtight container

4. Mixing device 5. Screening device 6. Material storage device 7. Heat recovery equipment

8. Steam 9. Transmission device 10. Airtight container storage part 11. Cylindrical body

12. Oval head 13. Material conveyor belt 14. Pressure vessel conveyor belt

15. Conveyor belt bracket 16. Feet 17. Mixer 18. Feeding port

19. Outlet 20. Vibrating screen 21. Airtight container outlet 22. Material outlet.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Embodiment one:

This embodiment provides a heat recovery process, comprising the following steps:

According to the temperature difference and heat transfer efficiency of heat recovery, set the contact time between the material and the pressure-tight container;

Set the maximum pressure of the pressure-tight container; a heat carrier with high heat capacity is placed in the pressure-tight container, and the heat carrier is water, heat-conducting oil, molten salt, etc.

The high-temperature material is stirred with the pressure-tight container, and the heat of the material is transferred to the pressure-tight container. As the temperature rises, the pressure in the pressure-tight container will rise, but it will not exceed the maximum pressure of the pressure-tight container; the material is granular Solids, such as coke, semi-coke, ash, steel slag, cement, etc.; the contact stirring method between the high-temperature material and the pressure-tight container is one of the rotary drum type and the closed space vibration contact type.

Screening of materials and pressure-tight containers after heat transfer;

Carry out heat recovery to the pressure-tight container with heat; preferably, the range of the recovered heat is 200-1300°C; preferably, steam generator, heat carrier furnace, heat transfer oil can be used for the pressure-tight container with heat There is at least one method for heat recovery in the furnace, and coke, semi-coke, ash, steel slag, cement and other materials are treated accordingly, such as storage and transportation.

This embodiment can effectively recover heat, reduce process investment, and reduce operating costs, thereby expanding its industrialization and application, making it more suitable for industrial applications, reducing consumption in the production process, and reducing environmental pollution. , to realize the effective utilization of resources and energy; for example, in the process of wet coke quenching, it can be prevented from being taken away by the steam generated in the water gasification process and lost to the atmosphere.

Embodiment two:

In this implementation, the pressure-tight container after heat recovery can be recycled, which is convenient for recycling next time and improves the versatility and practicability of the equipment. Specifically:

A heat recovery process, further comprising the following steps: recovering the pressure airtight container after heat recovery to the airtight container storage part; it can be transported through a transmission device, etc., and the pressure airtight container after heat recovery is recovered to the airtight container through the transmission device Inside the storage part of the airtight container; the storage part of the airtight container can adopt an open structure to facilitate its heat dissipation.

Embodiment three:

This embodiment provides a heat recovery device, comprising:

Material conveying device 1: used for conveying materials, the material conveying device 1 can adopt belt conveying device, bucket hoist, etc. in the prior art, and the present invention does not specifically limit it, as long as it can realize the conveying of materials. The conveyed material is a high-temperature material, which is used to recover its heat. The material is a granular solid, such as coke, semi-coke, ash, steel slag, cement, etc.;

Pressure vessel conveying device 2: used for conveying the airtight container 3 with pressure; in the same way, the pressure vessel conveying device 2 can adopt the belt conveying device in the prior art, etc., and the present invention does not specifically limit it, and can It is enough to realize the delivery of the pressure vessel 3 .

Mixing device 4: used to stir the material and the pressured airtight container 3, and transfer the heat of the material to the airtight container 3; the material conveyed by the material conveying device 1 and the pressure vessel conveying device 2 and the pressure vessel 3 enter the mixing chamber In the material device 4, the material mixing device 4 can adopt the mixer in the prior art, and the present invention does not make any improvements to it, so it will not be described in detail here, and the stirring of the material and the airtight container 4 can be realized, and the heat can be realized. It can be transferred, horizontal or vertical technicians can choose according to specific conditions, and the present invention does not make specific limitations; when mixing, multiple airtight containers 3 are used.

Screening device 5: the screening device 5 is arranged at the outlet of the mixing device 4, and the mixed material and the airtight container 3 in the mixing device 4 enter the screening device 5 through the discharge port for screening. The material after heat transfer and the airtight container 3 with pressure are screened; the screening device 5 can adopt the screening device in the prior art, and the technician selects a suitable size screen according to the size of the material and the airtight container 3 That is, the sieved airtight container 3 enters the next process for heat recovery, and the sieved material enters the material storage device 6 for storage or next-step utilization.

Heat recovery equipment 7: recover the heat of the pressurized airtight container 3, and the pressurized airtight container sieved by the screening device 5 is transported to the heat recovery equipment 7 through the transmission device in the prior art or manually To recover heat, the heat recovery device in this embodiment can use the steam generator in the prior art, and use the airtight container that has absorbed the heat to provide heat energy to the steam generator, and heat the water to become hot water or steam for use The heat recovery device can adopt the heat carrier furnace in the prior art, and the airtight container that has absorbed the heat is used to provide heat energy to the heat carrier furnace, and the powdery molten salt is heated to a melting point above 142 ° C, so that it is in a molten flow state The heat recovery device can use the heat transfer oil furnace in the prior art, and the airtight container that has absorbed the heat is used to provide heat energy to the heat transfer oil furnace, and the heat transfer oil is used as the circulating medium for heating; the heat recovery device 7 can also be Other devices in the prior art are used, and the present invention does not describe them in detail here, and it is only necessary for technicians to make corresponding selections according to specific conditions.

Preferably, a heat absorbing layer is provided on the outside of the airtight container 3 , specifically, the outer surface of the airtight container 3 is treated to enhance radiation heat absorption, and the treatment method is black coating or blackening.

In this embodiment, the material and the pressurized airtight container 3 are transported to the mixing device 4 through the material conveying device 1 and the pressure vessel conveying device 2, so that the dispersed pressurized airtight container 3 is directly stirred and mixed with the high-temperature material , according to the temperature difference of heat recovery and heat transfer efficiency, set a certain contact time; as the temperature rises, the pressure in the airtight container 3 will rise, but it will not exceed the maximum pressure allowed by its design, and the heat will be transferred to the airtight container After 3, it is separated from the material, and the separated pressurized airtight container 3 enters the heat recovery equipment for heat recovery.

Embodiment four:

In this embodiment, it is convenient to recycle the airtight container after heat recovery, specifically:

The outlet of the heat recovery equipment 7 is provided with a transmission device 9, the transmission device 9 adopts a belt transmission device in the prior art, etc., the transmission device 9 is connected to the storage part 10 of the closed container, and after the heat recovery, the airtight The container 3 is recovered into the airtight container storage part 10 through the conveying device 9; the airtight container storage part 10 can adopt an open structure to facilitate its heat dissipation.

Embodiment five:

The present embodiment describes the airtight container 3, specifically:

The airtight container 3 adopts a small-volume container, which is convenient for mixing and turning it, so as to better absorb heat and recover heat. Preferably, the airtight container 3 includes a cylindrical body 11, and the cylindrical body The two ends of 11 are provided with sealed elliptical head 12, and airtight container 3 also can adopt the pressure-resistant shape such as spherical.

The airtight container 3 is in a vacuum or semi-vacuum state, and a liquid or solid with high heat capacity is placed in the airtight container 3, such as heat carriers such as water, ammonia, molten salt, and heat transfer oil; the heat recovery device 7 adopts Steam generator for conversion to steam for recovery.

The material of the airtight container 3 is one of carbon steel, alloy steel, silicon carbide and the like.

Embodiment six:

This embodiment provides a specific implementation manner, specifically:

A heat recovery device, mainly used for recovering semi-coke. The particle diameter of semi-coke coming out of the pyrolysis furnace is 30-50mm, the temperature is 630°C, the outer diameter of the pressure vessel is 80mm, and the length is 240mm. After the interior is vacuumed, Inhale some water, the volume accounts for 90% of the total volume, the material is SS304 stainless steel, the wall thickness is 5mm, a heat recovery device includes a material conveyor belt 13, the material conveyor belt 13 is used to transport blue carbon particles, and one side of the material conveyor belt 13 is provided with The pressure vessel conveyor belt 14, the material conveyor belt 13 and the pressure vessel conveyor belt 14 can adopt the transmission belts in the prior art, and the outside of the material conveyor belt 13 and the pressure vessel conveyor belt 14 is provided with a conveyor belt bracket 15, and the bottom of the conveyor belt bracket 15 passes through the legs 16 is in contact with the ground; one side of the material conveyor belt 13 and the pressure vessel conveyor 14 is provided with a mixer 17, and the mixer 17 is arranged on the bottom of the material conveyor belt 13 and the pressure vessel conveyor belt 14, and the semi-coke particles and the airtight container 3 directly Enter in the mixer 17 by the feed inlet 18 of mixer 17; Mixer 17 adopts the mixer in the prior art and gets final product, and mixer 17 is used for being used for semi-coke particle and with pressure The closed container 3 is stirred, and the heat of the semi-coke particles is transferred to the closed container 3; the outlet 19 of the mixer 17 is provided with a vibrating screen 20 below, and the vibrating screen 20 can adopt a vibrating screen in the prior art, and the specific model Not specifically limited, engineers and technicians can select a suitable size screen according to the size of the semi-coke particles and the airtight container 3; the sieved airtight container 3 enters the next process for heat recovery, and the sieved semi-coke particles Enter the semi-coke particle storage device for storage or next-step utilization; the airtight container outlet 21 of the vibrating screen 20 can be connected with the transfer device, and the transfer device is connected with the steam generator, and the airtight container 3 screened out by the vibrating screen passes through the airtight container outlet 21 sieve out, transfer to the steam generator through the transfer device, absorb the heat in the airtight container 3 and recover the heat in the form of steam 8, the temperature of the semi-coke particles will drop to about 220 degrees Celsius; it can also be connected to the storage without connecting the transfer device device, which is manually transported to the steam generator for recovery; the semi-coke particles screened out through the material outlet 22 enter the semi-coke particle storage device for storage or next-step utilization; It only needs to make a corresponding selection, and the present invention does not describe it in detail here.

In this embodiment, the semi-coke particles and the pressurized airtight container 3 are transported to the mixer 17 by the blue-coke particle conveyor belt 13 and the pressure vessel conveyor belt 14, so that the pressure-filled airtight container 3 of the dispersed type is directly mixed with the high-temperature blue-coke The particles are directly stirred and mixed, and a certain contact time is set according to the temperature difference of heat recovery and heat transfer efficiency; as the temperature rises, the pressure in the airtight container 3 will rise, but it will not exceed the maximum pressure allowed by its design. After being transferred to the closed container 3, it is separated from the semi-coke particles, and the separated pressurized closed container 3 enters the steam generator for heat recovery.

This embodiment can effectively recover heat. Generally, the range of heat that can be recovered is 300-700°C. This embodiment is easy to operate and strong in safety and reliability.

The present invention has simple process, simple structure, and is convenient to use. The dispersed pressurized airtight container 3 is directly stirred and mixed with high-temperature semi-coke particles, and a certain contact time is set according to the temperature difference of heat recovery and heat transfer efficiency; As the temperature rises, the pressure in the airtight container 3 will rise, but it will not exceed the maximum pressure allowed by its design. After the heat is transferred to the airtight container 3, it will be separated from the semi-coke particles, and the airtight container 3 with pressure after separation Enter the heat recovery device 7 for heat recovery.

To sum up, due to the adoption of the above technical solution, the present invention can effectively recover heat, such as coke quenching treatment of semi-coke, which can avoid the process of wet coke quenching, which is produced by water gasification The steam is taken away and lost to the atmosphere, which can also reduce the process investment and reduce the operating cost, thereby expanding its industrialization and application, making it more suitable for industrialization, reducing consumption in the production process, and reducing environmental pollution. Realize the efficient use of resources and energy.

The devices and connections not specifically described above all belong to the prior art, and the present invention does not describe them in detail here, and they all belong to conventional technical means. That's it.

The preferred mode of the present application has been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the specific details in the above-mentioned embodiment. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solution of the present application. These Simple modifications all belong to the protection scope of the present application.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. In order to avoid unnecessary repetition, various possible combinations of the present application The method will not be further explained.

In addition, any combination of various implementations of the present application can also be made, as long as they do not violate the idea of the present application, the application should also be regarded as the content disclosed in the present application.

Claims (10)

1. A heat recovery process comprising the steps of:

the materials are contacted and stirred with a pressure closed container, and the heat of the materials is transferred to the pressure closed container;

sieving the material subjected to heat transfer and the pressure closed container;

and (5) recovering heat from the pressure closed container with heat.

2. A heat recovery process according to claim 1, further comprising the steps of: and recovering the heat in the pressure closed container after heat recovery into the closed container storage part.

3. The heat recovery process according to claim 1, wherein the heat recovery is performed by at least one of a steam generator, a heat carrier furnace and a heat conducting oil furnace on the pressure closed container with heat.

4. A heat recovery process according to claim 1, wherein a heat carrier having a high thermal capacity is placed in the pressure-tight vessel.

5. The heat recovery process according to claim 1, wherein the material is contacted with the pressure-tight container in a manner of one of a drum type and a closed space vibration contact type.

6. A heat recovery process according to claim 1, wherein the recovered heat of the heat recovery has a recovered heat amplitude of 200-1300 ℃.

7. A heat recovery device, comprising:

material conveying device (1): for conveying materials;

pressure vessel conveying device (2): a closed container (3) for conveying the material under pressure;

mixing device (4): the stirring device is used for stirring materials and a closed container (3) with pressure, and transferring heat of the materials to the closed container (3);

screening device (5): the device is used for sieving the materials subjected to heat transfer and a closed container (3) with pressure;

heat recovery device (7): heat of the pressurized closed container (3) is recovered.

8. A heat recovery device according to claim 7, characterized in that the outlet of the heat recovery device (7) is provided with a transfer device (9), the transfer device (9) being connected to a closed container storage (10).

9. A heat recovery device according to claim 7, wherein the closed vessel (3) is one of spherical, oblong, oval.

10. A heat recovery device according to claim 7, wherein the closed container (3) comprises a cylindrical body (11), and both ends of the cylindrical body (11) are provided with sealed elliptical heads (12).