CN111450562A - A device and process for purifying high-boiling chemical raw materials - Google Patents

Abstract

The invention relates to a purification device suitable for high-boiling chemical raw materials, including a purification tower and a hot blast stove. The device makes full use of the waste heat of the hot blast stove, so that the combustion system, the waste heat boiler and the tower body are naturally integrated; Centralized management; make the extracted fractions purer and the tower body height lower. The flue gas outlet temperature can be controlled below 140°C to avoid unfavorable process conditions such as coking, carbon deposition, sublimation, atomization or easy formation of foam, and innovate the deep processing technology of rectification and distillation. At the same time, a cooling device is set outside the purification tower to reduce the tower height, improve the cooling efficiency of the tower, reduce the temperature of the fraction before the tower, and improve the thermal efficiency of the tower.

Description

A device and process for purifying high-boiling chemical raw materials

technical field

The invention relates to the field of chemical industry, in particular to a purification device suitable for high-boiling chemical raw materials.

Background technique

Most of the high-boiling chemical raw materials are chemical substances that are easy to stick, coke, carbon deposition, sublimation, atomization, and easy to form foam. Fractions are widely used in chemical fiber, pharmaceutical, printing and dyeing and other fields. Due to their special physical properties, they can only be heated to above 400 ℃ by distillation stills at first and sent to distillation towers. , The sublimation part cannot be controlled, resulting in waste. In severe cases, the bottom of the kettle will burn red or burn through. In order to avoid the bottom of the kettle burning red or burning through, the production needs to be stopped for a period of time to deal with coking and carbon deposits, resulting in low production efficiency and heating of the distillation kettle. Caused energy waste; later developed into a tube furnace, but like the traditional process, it still needs to cooperate with steam boilers, heat transfer oil boilers, and cannot solve the problem of reboiling, resulting in some components that cannot be recovered. If reboiling fractions are recovered, distillation is required. The high temperature (above 400 ℃) circulating pump is used to circulate the liquid between the bottom of the tower and the distillation kettle, resulting in a vicious cycle of coking and carbon deposition, and the flue gas temperature of the tubular furnace is above 450 ℃, which is a serious waste.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a purification device suitable for high-boiling chemical raw materials, so that the extracted fraction is purer, and unfavorable process conditions such as coking, coke deposition, sublimation, atomization or easy formation of foam are avoided.

To achieve the above object, the present invention adopts the following technical solutions to realize:

A purification device suitable for high-boiling chemical raw materials includes a purification tower and a hot blast stove. The upper part of the purification tower is provided with a first condenser, the top of the purification tower is connected with a second condenser, and the hot blast stove is connected to a chimney through a waste heat utilization device. The waste heat utilization device includes The flue is equipped with an air heating section, a steam heating section, a heat transfer oil heating section, a raw material preheating heating section, and a residual material reboiling heating section from top to bottom. The air heating section is provided with a preheating section. The hot air pipe, the inlet of the preheating air pipe is fed with air, the outlet of the preheating air pipe is connected to the burner of the hot blast stove, the steam pipe is arranged on the steam heating section, the inlet of the steam pipe is connected to the water pipe, and the outlet of the steam pipe is connected to the insulation pipe of the finished product tank. , The heat transfer oil coil is arranged on the heat transfer oil heating section. The inlet of the heat transfer oil coil is connected to the heat transfer oil pipeline, and the outlet of the heat transfer oil coil is connected to the oil supply pipes of the first condenser and the second condenser, and the raw materials are preheated and heated. The raw material preheating coil is arranged on the section, the inlet of the raw material preheating coil is connected to the raw material conveying pipe, the outlet of the raw material preheating coil is connected to the feeding port of the purification tower through the decompression device, and the residual material is reboiled in the heating section. material reboiling coil, the inlet of the residual material reboiling coil is connected to the reboiling outlet at the bottom of the purification tower, and the outlet of the residual material reboiling coil is connected to the reboiling return port at the bottom of the purification tower; A second flue gas circulation pipe is arranged on the flue to be connected with the furnace chamber of the hot blast stove, and a third flue gas circulation pipe is arranged on the flue of the heat-conducting oil heating section to be connected to the second flue gas circulation pipe.

In the production process of the above device, after the combustion system of the hot blast stove is ignited, the high-temperature flue gas in the furnace enters the flue, the liquid raw material is preheated and supplied to the purification tower, the heat-conducting oil is preheated and supplied to each oil-using unit, and the water is heated into water vapor. Supply each gas unit, preheat the air into the combustion system to participate in the combustion, extract a part of the flue gas through the flue gas circulation pipe and send it to the hot blast furnace to mix it with the hot air in the furnace; the preheated raw materials enter the purification tower for production, The purified residual liquid enters the residual material reboiling coil through the reboiler discharge port, and returns to the bottom of the tower after reboiling for reproduction, and the production waste residue is discharged from the slag discharge pump.

A purification device suitable for high-boiling chemical raw materials includes a purification tower and a hot blast stove. The upper part of the purification tower is provided with a first condenser, the top of the purification tower is connected with a second condenser, and the hot blast stove is connected to a chimney through a waste heat utilization device. The waste heat utilization device includes The flue is equipped with an air heating section, a steam heating section, a heat transfer oil heating section, a raw material preheating heating section from top to bottom, and a preheating air duct and a preheating air duct on the air heating section. The inlet of the preheating air pipe is connected to the burner of the hot blast stove, the steam pipe is arranged on the steam heating section, the inlet of the steam pipe is connected to the water pipe, the outlet of the steam pipe is connected to the insulation pipe of the finished product tank, and the heat transfer oil heating section is arranged The heat transfer oil coil, the inlet of the heat transfer oil coil is connected to the heat transfer oil pipeline, the outlet of the heat transfer oil coil is connected to the oil supply pipes of the first condenser and the second condenser, and the raw material preheating heating section is arranged on the raw material preheating coil. , the inlet of the raw material preheating coil is connected to the raw material conveying pipe, the outlet of the raw material preheating coil is connected to the inlet of the purification tower through the decompression device, and the flue between the air heating section and the chimney is provided with a first flue gas circulation The pipe is connected to the burner of the hot blast stove, the flue of the air heating section is provided with a second flue gas circulation pipe to connect with the furnace of the hot blast stove, and the flue of the heat-conducting oil heating section is provided with a third flue gas circulation pipe and the second flue gas circulation pipe. Flue gas circulation pipe connection. The bottom of the purification tower is provided with a residual material reboiler, the heat source inlet of the reboiler is connected with the furnace of the hot blast stove through a flue gas pipe, and the residual heat outlet of the residual material reboiler is connected with the flue through a flue gas pipe.

In the production process of the above device, after the combustion system of the hot blast furnace is ignited, the hot air in the furnace enters the reboiler at the bottom of the tower, and the high temperature flue gas in the furnace enters the flue, the liquid raw material is preheated and supplied to the purification tower, and the heat transfer oil is preheated Supply each oil unit, heat water into water vapor to supply each gas unit, preheat the air and send it to the combustion system to participate in the combustion, extract a part of the flue gas through the flue gas circulation pipe and send it to the hot blast furnace, so that it can be combined with the hot air in the furnace. Mixing; the preheated raw material enters the purification tower for production, and the purified residual liquid enters the reboiler at the bottom of the tower to reboil and continue production. The preheated flue gas of the reboiler enters the flue, and the production waste is discharged from the slag discharge pump.

Compared with the prior art, the beneficial effects of the present invention are:

The device makes full use of the waste heat of the hot blast stove, so that the combustion system, the waste heat boiler and the tower body are naturally integrated; the energy in the plant is distributed and managed centrally; the extracted fraction is purer and the tower body height is lower.

The flue gas outlet temperature can be controlled below 140°C to avoid unfavorable process conditions such as coking, carbon deposition, sublimation, atomization or easy formation of foam, and innovate the deep processing technology of rectification and distillation. At the same time, a cooling device (condenser) is set outside the purification tower to reduce the tower height, improve the cooling efficiency of the tower, reduce the temperature of the fraction before exiting the tower, and improve the thermal efficiency of the tower.

The process is suitable for batch towers (kettles) and continuous towers. It can also be used in atmospheric towers or vacuum towers (kettles), and is more suitable for high-boiling chemical raw materials. It is also applicable to the distillation and rectification of other raw materials.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 1. FIG.

FIG. 2 is a schematic diagram of a partial structure of Embodiment 1. FIG.

FIG. 3 is a schematic structural diagram of Embodiment 2. FIG.

FIG. 4 is a schematic diagram of a partial structure of Embodiment 2. FIG.

FIG. 5 is a working principle diagram of Embodiment 1. FIG.

FIG. 6 is a working principle diagram of Embodiment 2. FIG.

Detailed ways

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings:

Example 1

As shown in Fig. 1-Fig. 2, a kind of device suitable for high-boiling chemical raw material purification, comprising purification tower 1, hot blast stove 2, the top of purification tower 1 is provided with first condenser 3, and the top of purification tower 1 is connected with second condenser 4, The hot blast stove 2 is connected to the chimney 5 through a waste heat utilization device. The waste heat utilization device includes a flue 6. The flue 6 is provided with an air heating section 610, a steam heating section 620, a heat transfer oil heating section 630, and a raw material preheating section from top to bottom. The heating and heating section 640, the residual material reboiling heating section 650, the air heating section 610 is provided with a preheating air duct 611, the inlet of the preheating air duct 611 is fed with air, and the outlet of the preheating air duct 611 is connected to the hot blast stove 2 burner, steam pipe 621 is arranged on the steam heating section 620, the inlet of the steam pipe 621 is connected to the water pipe, the outlet of the steam pipe 621 is connected to the finished product tank 7 insulation pipe, the heat transfer oil heating section 630 is arranged with a heat transfer oil coil 631, and the heat transfer oil The inlet of the coil 631 is connected to the heat transfer oil pipeline, the outlet of the heat transfer oil coil 631 is connected to the oil supply pipes of the first condenser 3 and the second condenser 4, and the raw material preheating heating section 640 is arranged with a raw material preheating coil 641. The inlet of the raw material preheating coil 641 is connected to the raw material conveying pipe, the outlet of the raw material preheating coil 641 is connected to the inlet 101 of the purification tower through the decompression device 13, and the residual material reboiling heating section 650 is arranged on the residual material reboiling plate. Pipe 651, the inlet of the residual material reboiling coil 651 is connected with the reboiling outlet 102 at the bottom of the purification tower 1, and the outlet of the residual material reboiling coil 651 is connected to the reboiling return port 106 at the bottom of the purification tower 1; The flue 6 of the hot section 610 is provided with a first flue gas circulation pipe 8 to connect with the furnace of the hot blast stove 2, and the flue 6 of the heat-conducting oil heating section 630 is provided with a second flue gas circulation pipe 9 and the first flue gas. Circulation pipe 8 is connected.

The waste heat utilization part of the device fully considers the characteristics of high reboil outlet temperature of high-boiling chemical raw materials, and the temperature of the flue gas outlet is controlled above 560 °C. The raw material is heated to the temperature required by the process (such as 370 °C); the heat transfer oil is heated to the temperature required by the process (such as 200 °C); the heated air is fed into the combustion system; the final flue gas temperature is less than 140 °C; in order to maximize the use of waste heat, Part of the flue gas is drawn out through the flue gas circulation pipe and sent to the hot blast furnace to be mixed with the hot air in the furnace; the remaining flue gas is discharged from the chimney.

The device is suitable for high boiling point temperature of raw materials (generally higher than 300 ° C), and there are unfavorable process conditions such as easy coking and carbon deposition, and it is not suitable for easy sublimation and atomization.

In the production process of the above device, after the combustion system of the hot blast stove is ignited, the high-temperature flue gas in the furnace enters the flue, the liquid raw material is preheated and supplied to the purification tower, the heat-conducting oil is preheated and supplied to each oil-using unit, and the water is heated into water vapor. Supply each gas unit, preheat the air into the combustion system to participate in the combustion, extract a part of the flue gas through the flue gas circulation pipe and send it to the hot blast furnace to mix it with the hot air in the furnace; the preheated raw materials enter the purification tower for production, The purified residual liquid enters the residual material reboiling coil through the reboiler discharge port, and returns to the bottom of the tower after reboiling for reproduction, and the production waste residue is discharged from the slag discharge pump.

Example 2

As shown in Fig. 3-Fig. 4, a kind of device suitable for purification of high-boiling chemical raw materials comprises purification tower 1, hot blast stove 2, and the top of purification tower 1 is provided with first condenser 3, and the top of purification tower 1 is connected with second condenser 4, The hot blast stove 2 is connected to the chimney 5 through a waste heat utilization device. The waste heat utilization device includes a flue 6. The flue 6 is provided with an air heating section 610, a steam heating section 620, a heat transfer oil heating section 630, and a raw material preheating section from top to bottom. The heat supply section 640, the air heating section 610 is provided with a preheating air duct 611, the inlet of the preheating air duct 611 is fed with air, and the outlet of the preheating air duct 611 is connected to the burner of the hot blast stove 2, and the steam heating section The steam pipe 621 is arranged on the 620, the inlet of the steam pipe 621 is connected to the water pipe, the outlet of the steam pipe 621 is connected to the thermal insulation pipe of the finished product tank 7, the heat transfer oil coil 631 is arranged on the heat transfer oil heating section 630, and the inlet of the heat transfer oil coil 631 is connected to the heat transfer oil pipeline. , the outlet of the heat transfer oil coil 631 is connected to the oil supply pipes of the first condenser 3 and the second condenser 4, the raw material preheating heating section 640 is arranged with a raw material preheating coil 641, and the inlet of the raw material preheating coil 641 is connected The raw material conveying pipe, the outlet of the raw material preheating coil 641 is connected to the feeding port 101 of the purification tower through the decompression device 13, and the flue 6 of the air heating section 610 is provided with the first flue gas circulation pipe 8 and the hot blast stove 2. The furnace is connected, and the flue 6 of the heat-conducting oil heating section 630 is provided with a second flue gas circulation pipe 9 to connect with the first flue gas circulation pipe 8;

The bottom of the purification tower 1 is provided with a residual material reboiler 10, the heat source inlet of the reboiler 10 is connected to the furnace of the hot blast stove 2 through a flue gas pipe 11, and the residual heat outlet of the residual material reboiler 10 is connected to the flue through a flue gas pipe 12. 6 connections.

The waste heat utilization part of the device fully considers the characteristics of high reboil outlet temperature of high-boiling chemical raw materials, and the temperature of the flue gas outlet is controlled above 560 °C. The raw material is heated to the temperature required by the process (such as 370 °C); the heat transfer oil is heated to the temperature required by the process (such as 200 °C); the heated air is fed into the combustion system; the final flue gas temperature is less than 140 °C; in order to maximize the use of waste heat, Part of the flue gas is extracted through the flue gas circulation pipe and sent to the hot blast stove, mixed with the hot air of the combustion system and sent to the reheater; the remaining flue gas is discharged from the chimney.

The tower body of the device starts from the reboiler, which solves the coking and carbon deposition of liquid reboiling, frequent accidents caused by the high temperature circulating pump, and energy loss in the pipeline from the bottom of the tower to the distillation kettle; the height of the tower body is significantly reduced; The liquid separator fully purifies the front distillate, recovers the last part of the distillate, and avoids the unfavorable working environment such as vacuum pump blockage and high temperature.

In the production process of the above device, after the combustion system of the hot blast furnace is ignited, the hot air in the furnace enters the reboiler at the bottom of the tower, and the high temperature flue gas in the furnace enters the flue, the liquid raw material is preheated and supplied to the purification tower, and the heat transfer oil is preheated Supply each oil unit, heat water into water vapor to supply each gas unit, preheat the air and send it to the combustion system to participate in the combustion, extract a part of the flue gas through the flue gas circulation pipe and send it to the hot blast furnace, so that it can be combined with the hot air in the furnace. Mixing; the preheated raw material enters the purification tower for production, and the purified residual liquid enters the reboiler at the bottom of the tower to reboil and continue production. The preheated flue gas of the reboiler enters the flue, and the production waste is discharged from the slag discharge pump.

The production residual liquid of the device does not need to be reboiled outside the tower through the pipeline output, so as to avoid the residual liquid condensing in the pipeline. The device is suitable for raw materials with unfavorable process conditions such as coking, coke deposition, sublimation, atomization or foam formation, especially when the temperature is high (generally higher than 300 ° C), and the circulating pump or slag discharge pump is used to extract energy during the cycle process. waste, and the temperature of the circulating raw materials is high, which is easy to cause accidents, which can be easily avoided by this device.

The above description is only the basic principle of the present invention, and does not limit the present invention. Any equivalent changes and modifications made to it according to the present invention are all within the scope of the technical protection scheme of this patent.

Claims (4)

1. A purification device suitable for high-boiling-point chemical raw materials is characterized by comprising a purification tower and a hot-blast stove, wherein a first condenser is arranged at the upper part of the purification tower, a second condenser is connected with the top part of the purification tower, the hot-blast stove is connected with a chimney through a waste heat utilization device, the waste heat utilization device comprises a flue, an air heating section, a steam heating section, a heat conduction oil heating section, a raw material preheating heating section and a residual material reboiling heating section are arranged on the flue from top to bottom, a preheating air pipeline is arranged on the air heating section, air is introduced into an inlet of the preheating air pipeline, an outlet of the preheating air pipeline is connected with a burner of the hot-blast stove, a steam pipeline is arranged on the steam heating section, an inlet of the steam pipeline is connected with a water pipe, an outlet of the steam pipeline is connected with a finished product tank heat preservation pipe, a heat conduction oil coil is arranged on the heat conduction oil heating section, an, a raw material preheating coil is arranged on the raw material preheating and heat supplying section, an inlet of the raw material preheating coil is connected with a raw material conveying pipe, an outlet of the raw material preheating coil is connected with a feeding port of the purifying tower through a pressure reducing device, a residual material reboiling coil is arranged on the residual material reboiling and heat supplying section, an inlet of the residual material reboiling coil is connected with a reboiling discharging port at the bottom of the purifying tower, and an outlet of the residual material reboiling coil is connected with a reboiling returning port at the bottom of the purifying tower; and a second flue gas circulation pipeline is arranged on a flue of the air heating section and connected with a hearth of the hot blast stove, and a third flue gas circulation pipeline is arranged on a flue of the heat conduction oil heating section and connected with the second flue gas circulation pipeline.

2. A purification device suitable for high-boiling-point chemical raw materials is characterized by comprising a purification tower, a hot-blast stove, a first condenser is arranged at the upper part of the purification tower, a second condenser is connected at the top part of the purification tower, the hot-blast stove is connected with a chimney through a waste heat utilization device, the waste heat utilization device comprises a flue, an air heating section, a steam heating section, a heat-conducting oil heating section and a raw material preheating heating section are arranged on the flue from top to bottom, a preheating air pipeline is arranged on the air heating section, air is introduced into an inlet of the preheating air pipeline, an outlet of the preheating air pipeline is connected with a burner of the hot-blast stove, a steam pipeline is arranged on the steam heating section, an inlet of the steam pipeline is connected with a water pipe, an outlet of the steam pipeline is connected with a finished product tank heat-insulating pipe, a heat-conducting oil coil pipe is arranged on the heat-conducting oil, the raw material preheating and heating section is provided with a raw material preheating coil, an inlet of the raw material preheating coil is connected with a raw material conveying pipe, an outlet of the raw material preheating coil is connected with a feeding port of the purification tower through a pressure reducing device, a flue between the air heating section and the chimney is provided with a first flue gas circulation pipeline connected with a burner of the hot blast stove, a flue of the air heating section is provided with a second flue gas circulation pipeline connected with a hearth of the hot blast stove, and a flue of the heat conduction oil heating section is provided with a third flue gas circulation pipeline connected with the second flue gas circulation pipeline. The bottom of the purification tower is provided with a residual material reboiler, a heat source inlet of the reboiler is connected with a hearth of the hot blast stove through a flue gas pipe, and a waste heat outlet of the residual material reboiler is connected with a flue through a smoke exhaust pipe.

3. The production process suitable for the high-boiling-point chemical raw material purification device according to claim 1, wherein after the combustion system of the hot blast stove is ignited, high-temperature flue gas in a hearth enters a flue, liquid raw materials are preheated and supplied to the purification tower, heat conducting oil is preheated and supplied to each oil unit, water is heated to be steam and supplied to each gas unit, air is preheated and sent to the combustion system to participate in combustion, and a part of flue gas is pumped out and sent to the hot blast stove through a flue gas circulating pipe so as to be mixed with hot air in the hearth; the preheated raw material enters a purification tower for production, purified residual liquid enters a residual material reboiling coil pipe through a reboiling discharge port, the residual liquid returns to the tower bottom for reproduction after reboiling, and production waste residues are discharged from a residue discharge pump.

4. The production process suitable for the purification device of high boiling point chemical raw material as claimed in claim 2, wherein after the combustion system of the hot-blast stove is ignited, the hot air in the hearth enters the reboiler at the bottom of the tower, the high temperature flue gas in the hearth enters the flue, the liquid raw material is preheated and supplied to the purification tower, the heat conducting oil is preheated and supplied to each oil unit, the water is heated to be steam and supplied to each gas unit, the air is preheated and supplied to the combustion system for combustion, and a part of the flue gas is pumped out and supplied to the hot-blast stove through the flue gas circulating pipe to be mixed with the hot air in; the preheated raw materials enter a purification tower for production, the purified residual liquid enters a reboiler at the bottom of the tower for reboiling and then continues to be produced, the preheated flue gas of the reboiler enters a flue, and the production waste residues are discharged from a residue discharge pump.

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