CN210434260U

CN210434260U - Thermoelectric waste gas recovery device

Info

Publication number: CN210434260U
Application number: CN201921341612.1U
Authority: CN
Inventors: 谢剑文; 隋一雷; 朱俊平; 王树明
Original assignee: Shanghai Jinlian Thermoelectricity Co ltd
Current assignee: Shanghai Jinlian Thermoelectricity Co ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-05-01
Anticipated expiration: 2029-08-16

Abstract

The utility model discloses a thermoelectric waste gas recovery device relates to the thermoelectricity field, aims at handling natural gas generating set exhaust waste gas. The thermoelectric waste gas recovery device comprises a cooling tower, an absorption tower, a release tower, a condensing tower and a heat exchange device. The absorption liquid in the absorption tower captures carbon dioxide in the fixed waste gas, and the carbon dioxide is heated in the release tower to release the carbon dioxide; the carbon dioxide obtained by the method is input into a gas storage tank for storage after operations such as cooling, purification, compression and the like. The thermoelectric waste gas recovery device can recover carbon dioxide contained in the combustion waste gas of natural gas, remove harmful gases such as sulfur dioxide and carbon monoxide, reduce atmospheric pollution and inhibit greenhouse effect to a certain extent. The thermoelectric waste gas recovery device effectively utilizes the waste heat of the waste gas as a heat source for heating and releasing carbon dioxide in the recovery process, and also has the effect of saving energy.

Description

Thermoelectric waste gas recovery device

Technical Field

The utility model belongs to the technical field of the thermoelectricity and specifically relates to a thermoelectric waste gas recovery device.

Background

The natural gas has high heat value and the advantage of cleanness, is ideal energy and can be industrially used as fuel for thermal power generation. The natural gas is mainly combusted to generate carbon dioxide and water, the carbon dioxide is a main greenhouse gas, the greenhouse effect is intensified when the carbon dioxide is directly discharged to the atmosphere, and the carbon dioxide can be widely applied to industrial production and has certain economic benefit.

The present chinese utility model with the granted publication number CN201020694535.0 provides an apparatus for recovering carbon dioxide from flue gas, which comprises a carbon dioxide recovery tower, a carbon dioxide regeneration tower, a cooling condensation separator, a lean and rich solution heat exchanger, a lean solution cooler, a rich solution pump, a regulating valve, a carbon dioxide cooler, and a carbon dioxide gas-water separator.

The working principle is as follows:

1. the pretreated flue gas raw material enters the lower part of a carbon dioxide recovery tower, and MEA absorption liquid is sprayed downwards from the top of the carbon dioxide recovery tower to be in countercurrent contact with the carbon dioxide for recovery. The absorbing solution that has absorbed the carbon dioxide becomes a MEA rich solution.

And 2, the MEA rich solution enters the carbon dioxide regeneration tower from the top, is heated to release carbon dioxide and becomes an MEA lean solution, the MEA lean solution flows out from the bottom of the carbon dioxide regeneration tower, and the released carbon dioxide is output from the top of the carbon dioxide regeneration tower.

3. The carbon dioxide is then purified by passing through a cooling condensation separator to finally obtain carbon dioxide gas with the purity of 99.5%.

This solution has certain drawbacks.

The absorption of carbon dioxide by the absorption liquid needs to be carried out at a lower temperature, and the release of carbon dioxide needs to absorb heat. The waste gas in the actual production has certain waste heat, the temperature is higher, and the absorption liquid can be introduced only by cooling first; and the absorption liquid needs to be heated to raise the temperature when releasing the carbon dioxide. On one hand, extra heating equipment is required to be additionally installed for heating absorption liquid, so that extra power consumption is increased; on the other hand, the waste heat of the waste gas is dissipated along with the cooling of the waste gas and is not reasonably utilized, so that the energy utilization efficiency of the equipment is low. Therefore, a new operation mode needs to be provided, which can not only utilize the waste heat of the waste gas, but also reduce the energy consumption of the equipment.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a thermoelectric waste gas recovery device can retrieve carbon dioxide from the waste gas of natural gas burning to harmful gas such as sulfur dioxide, carbon monoxide is clear away. The thermoelectric waste gas recovery device is also provided with a heat exchange device, so that the waste heat of the waste gas can be recycled, and the thermoelectric waste gas recovery device has the effects of energy conservation and environmental protection.

The utility model discloses a concrete scheme as follows:

a thermoelectric exhaust gas recovery device comprising:

the cooling tower is provided with a waste gas inlet and a drain pipe, the cooling tower is connected with a pipeline, and the other end of the pipeline is connected with the absorption tower.

The absorption tower is connected with a tail gas pipe, the other end of the tail gas pipe is connected with a tail gas treatment device, the absorption tower is connected with a second pipeline, and the other end of the second pipeline is connected with the release tower; the absorption tower is filled with absorption liquid.

The releasing tower is connected with a third pipeline, and the other end of the third pipeline is connected with the condensing tower.

The condensing tower is connected with No. four pipelines on the condensing tower, and No. four pipeline other ends and gas compression device are connected.

The heat exchange device comprises a heat absorption assembly, a heat release assembly, a circulating pump and a circulating pipe, wherein the heat absorption assembly is fixedly connected with the cooling tower, the heat release assembly is fixedly connected with the release tower, and the heat absorption assembly, the heat release assembly and the circulating pump are connected through the circulating pipe to form an annular passage; the heat exchange device is internally provided with a heat exchange medium.

Through adopting above-mentioned technical scheme, the waste gas that the natural gas burning produced passes through the waste gas entry and gets into the cooling tower, and the cooling back of waste gas is upwards exported from the cooling tower top, and the vapor in the waste gas then the liquefaction gathers in the bottom of the cooling tower and discharges. Then, the exhaust gas is fed into the absorption tower, carbon dioxide in the exhaust gas is absorbed by the absorption liquid, and other impurity gases are discharged from the exhaust gas pipe without being absorbed by the absorption liquid. The absorption liquid absorbing the carbon dioxide is heated in the release tower to release the carbon dioxide again, and the carbon dioxide is input into the condensing tower to be condensed and purified, so that the high-purity carbon dioxide gas is finally obtained.

In addition, the heat exchange device is used for recovering waste heat of the waste gas and heating the absorption liquid in the release tower. The heat exchange medium in the heat exchange device can absorb the heat of the waste gas in the cooling tower in the heat absorption assembly to reduce the temperature of the waste gas. The heat exchange medium after absorbing heat enters the heat release assembly along the circulating pipe, and the heat is released to heat the absorption liquid in the release tower to raise the temperature. And then the heat exchange medium after releasing heat returns to the heat absorption assembly along the circulating pipe. Through heat exchange medium, waste gas waste heat is passed to in the release tower for the heating of absorption liquid, has both realized recycling of waste gas waste heat, has reduced the extra heating energy consumption of release tower department again, plays energy-conserving efficient effect.

This utility model discloses further set up to: the thermoelectric waste gas recovery device is also provided with an absorption liquid recovery device which comprises a first recovery pump, a second recovery pump, a first recovery pipe and a second recovery pipe. The first recovery pump is arranged on the first recovery pipe, and the second recovery pump is arranged on the second recovery pump; one end of the first recovery pipe is connected with the release tower, and the other end of the first recovery pipe is connected with the absorption tower; one end of the second recovery pipe is connected with the condensing tower; the other end is connected with a first recovery pipe.

By adopting the technical scheme, the residual absorption liquid in the release tower and the condensation tower can flow back to the absorption tower, so that the cyclic utilization of the absorption liquid is realized, and the loss of the absorption liquid is reduced. This indirectly saves the cost of the waste gas recovery treatment.

This utility model discloses further set up to: the thermoelectric waste gas recovery device is also provided with a gas compression device, which comprises a gas compressor and a gas storage tank, wherein the gas compressor is connected with the condensing tower through a fourth pipeline, and the gas storage tank is connected with the gas compressor through a compression gas pipe.

Through adopting above-mentioned technical scheme, compress carbon dioxide gas in order to reduce its required space of storing, can save storage and transportation cost.

This utility model discloses further set up to: still be equipped with a tail gas processing apparatus on this thermoelectric waste gas recovery device, including sulphur fixing device and tail gas combustion chamber, pass through the tail gas union coupling between sulphur fixing device, tail gas combustion chamber and the absorption tower.

By adopting the technical scheme, after the tail gas is treated, the emission of harmful gases such as sulfur dioxide, carbon monoxide and the like can be reduced, the atmospheric pollution is reduced, and the damage to the environment is reduced.

This utility model discloses further set up to: a condenser is also arranged in the heat exchange device, and the condenser is arranged on one of the circulating pipes.

Through adopting above-mentioned technical scheme, the condenser can accelerate the cooling of the heat transfer medium in the heat release subassembly to improve the heat absorption efficiency of the heat transfer medium in the heat absorption subassembly.

This utility model discloses further set up to: the second pipeline is also provided with an absorption liquid delivery pump.

Through adopting above-mentioned technical scheme, absorption liquid delivery pump efficiency can improve the speed that absorption liquid transported to the release tower from the absorption tower, indirectly improves the conveying efficiency of carbon dioxide.

This utility model discloses further set up to: a cooling tower thermometer is arranged on the cooling tower; the releasing tower is provided with a releasing tower thermometer.

Through adopting above-mentioned technical scheme, install cooling special thermometer and release tower thermometer on cooling tower and release tower respectively, be favorable to the temperature in user's real time monitoring cooling tower and the release tower.

The utility model has the beneficial technical effects that:

1. the heat exchange device effectively realizes the reutilization of waste gas waste heat, the waste heat of the waste gas is used for releasing the heat source released by the carbon dioxide in the tower, a heating assembly does not need to be additionally arranged, the heating cost is reduced, and the energy utilization rate is also improved.

2. The waste gas treatment device can treat other harmful gases except carbon dioxide in the waste gas generated by the combustion of the natural gas, is beneficial to protecting the environment and saves the environmental treatment cost; and the absorption liquid recovery device is installed, so that the absorption liquid can be recycled, the loss of the absorption liquid is reduced, and the recovery and treatment cost of the waste gas is further reduced.

Drawings

Fig. 1 is a schematic structural view of a thermoelectric exhaust gas recovery device.

In the figure, 1, a cooling tower; 11. a first pipeline; 12. a drain pipe; 13. an exhaust gas inlet; 14. a cooling tower thermometer; 2. an absorption tower; 21. a second pipeline; 22. an absorption liquid delivery pump; 3. a release tower; 31. a third pipeline; 32. a release column thermometer; 4. a condensing tower; 41. a fourth pipeline; 5. a heat exchange device; 51. a heat sink assembly; 52. a heat emitting assembly; 53. a circulation pump; 54. a circulation pipe; 55. a condenser; 6. an absorption liquid recovery device; 61. a first recovery pump; 62. a second recovery pump; 63. a first recovery pipe; 64. a second recovery pipe; 7. a gas compression device; 71. a gas compressor; 72. a gas storage tank; 73. compressing the air pipe; 8. a tail gas treatment device; 81. a sulfur fixing device; 82. a tail gas combustion chamber; 83. a tail gas pipe; 84. and a tail gas pump.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

Example one

Referring to fig. 1, the thermoelectric waste gas recovery device includes a cooling tower 1, an absorption tower 2, a release tower 3, a condensing tower 4, a heat exchange device 5, a tail gas treatment device 8, an absorption liquid recovery device 6, and a gas compression device 7.

The lower end of the cooling tower 1 is provided with a waste gas inlet 11, and the bottom of the cooling tower 1 is provided with a drain pipe 12; the top of the cooling tower 1 is connected with a first pipeline 13, and the other end of the first pipeline 13 is connected with the absorption tower 2.

The absorption tower 2 is connected with a tail gas pipe 83, and the other end of the tail gas pipe 83 is connected with a tail gas treatment device 8; the absorption tower 2 is connected with a second pipeline 21, and the other end of the second pipeline 21 is connected with the bottom of the release tower 3. The absorption tower 2 is filled with absorption liquid.

A first recovery pipe 63 is connected to the release tower 3, and the other end of the first recovery pipe 63 is connected with an absorption liquid recovery device 6; the top of the releasing tower 3 is connected with a third pipeline 31, and the other end of the third pipeline 31 is connected with the bottom of the condensing tower 4.

A second recovery pipe 64 is connected to the condensing tower 4, and the other end of the second recovery pipe 64 is connected with the absorption liquid recovery device 6; the top of the condensing tower 4 is connected with a fourth pipeline 41, and the other end of the fourth pipeline 41 is connected with the gas compression device 7.

Referring to fig. 1, a heat exchange device 5 is installed between a cooling tower 1 and a discharge tower 3 in order to recover and utilize waste heat of exhaust gas. The heat exchange device 5 includes a condenser 55, a circulation pump 53, two circulation pipes 54, a heat absorbing module 51, and a heat releasing module 52.

The heat absorbing module 51 and the heat releasing module 52 are box-shaped containers with hollow interiors, and a heat exchange medium flows in the containers, wherein absolute ethyl alcohol is used. The heat absorbing component 51 is arranged on the side wall of the cooling tower 1, the heat releasing component 52 is arranged on the side wall of the releasing tower 3, the heat absorbing component 51 and the heat releasing component 52 are connected through two circulating pipes 54 to form an annular passage, the circulating pump 53 is arranged on one circulating pipe 54, and the condenser 55 is arranged on the other circulating pipe 54.

Referring to fig. 1, an absorption liquid recovery device 6 is further provided in the thermoelectric exhaust gas recovery device, and the absorption liquid recovery device 6 includes a first recovery pump 61, a second recovery pump 62, a first recovery pipe 63, and a second recovery pipe 64. The first recovery pump 61 is arranged on the first recovery pipe 63, and the second recovery pipe 64 is arranged on the second recovery pipe 64; two ends of a first recovery pipe 63 are connected with the releasing tower 3 and the absorption tower 2, and two ends of a second recovery pipe 64 are connected with the condensing tower 4 and the absorption tower 2.

Referring to fig. 1, a gas compression device 7 is further provided in the thermoelectric waste gas recovery device, the gas compression device 7 includes a gas compressor 71 and a gas storage tank 72, wherein the gas compressor 71 and the condensing tower 4 are connected by a fourth pipe 41, and the gas storage tank 72 and the gas compressor 71 are connected by a gas collecting pipe.

Referring to fig. 1, an exhaust gas treatment device 8 is connected to the absorption tower 2 through an exhaust pipe 83, and the exhaust gas treatment device 8 includes a sulfur fixing device 81 and an exhaust gas combustion chamber 82, wherein a desulfurizing agent is contained in the sulfur fixing device 81.

The waste gas generated by burning natural gas in the thermoelectric unit comprises carbon dioxide, water vapor, carbon monoxide, residual natural gas and sulfur dioxide. The exhaust gas is conveyed through the exhaust gas pipe to the exhaust gas inlet 11 and enters the cooling tower 1, and the temperature in the cooling tower 1 is raised by the heat of the exhaust gas. The heat exchange medium anhydrous ethanol contained in the heat absorption component 51 has low boiling point and is volatile, and the high temperature in the cooling tower 1 enables the heat exchange medium to be rapidly volatilized to be changed into a gaseous state, and meanwhile, the heat of the waste gas in the cooling tower 1 can be absorbed, so that the temperature of the waste gas is reduced. This has the advantage that, on the one hand, the water vapor in the exhaust gas is condensed and liquefied and is discharged through the water discharge pipe 12; on the other hand, when the temperature of the exhaust gas is lowered, the binding capacity between the carbon dioxide in the exhaust gas and the absorbent can be improved. As for the heat in the exhaust gas, it is absorbed and carried away by the heat exchange medium, which then leaves the heat absorption module 51 through the circulation pipe 54.

The cooled exhaust gas leaves the cooling tower 1 through a first pipeline 13 at the top end of the cooling tower 1 and is conveyed to the absorption tower 2. The absorption liquid ethanolamine stored in the absorption tower 2 has a property of absorbing carbon dioxide at a low temperature and releasing carbon dioxide when heated. Carbon dioxide can be quickly absorbed and fixed by the absorption liquid, and gases such as carbon monoxide, natural gas, sulfur dioxide and the like can not be absorbed by the absorption liquid and are free. The off gas is discharged from the absorption tower 2 through the off gas pipe 83, and the absorption liquid having absorbed carbon dioxide is sent to the release tower 3 through the second pipe 21.

The tail gas is pushed by a tail gas pump 84 and is input into a sulfur fixing device 81 through a tail gas pipe 83, and sulfur dioxide in the tail gas is absorbed by a desulfurizer; the tail gas then enters the tail gas combustor 82 through the tail gas pipe 83, and carbon monoxide and natural gas in the tail gas are ignited and removed.

The absorbing liquid having absorbed the carbon dioxide is transported into the releasing tower 3 through the second pipe 21. At the same time, the heat exchange medium, i.e., absolute ethanol, absorbing heat enters the heat releasing assembly 52 through the circulation pipe 54. The heat exchange medium cools and releases heat in the heat releasing assembly 52, and the released heat raises the temperature in the release tower 3; the absorption liquid having absorbed carbon dioxide releases carbon dioxide by heating, and carbon dioxide leaves the release tower 3 through a third pipe 31 at the top of the release tower 3. In addition, the liquefied heat-exchange medium after heat release leaves the heat releasing module 52 through the circulation pipe 54 and returns to the heat absorbing module 51.

The circulation pump 53 circulates the heat exchange medium through the heat absorbing module 51, the heat releasing module 52, and the circulation pipe 54.

Carbon dioxide released from the absorption liquid is conveyed to the condensing tower 4 through a third pipeline 31. The condensing tower 4 serves to condense and remove the absorbent evaporated from the releasing tower 3, thereby further obtaining high-purity carbon dioxide gas. The condensed and purified carbon dioxide gas enters a gas compressor 71 through a fourth pipeline 41, and the gas compressor 71 pressurizes the carbon dioxide gas and sends the carbon dioxide gas into a gas storage tank 72 for storage through a compressed gas pipe 73.

Further, the absorption liquid in the release tower 3 and the condensation tower 4 returns to the absorption tower 2 through the first recovery pipe and the second recovery pipe, respectively, and is powered by the first recovery pump and the second recovery pump, respectively.

In order to increase the liquefaction rate of the heat exchange medium in the heat exchange unit 5, a condenser 55 is installed on the circulation pipe 54 of the heat exchange unit 5. This has the advantage that the heat exchange medium from the discharge tower 3 is not completely liquefied, and the reflux of the gas-liquid mixed heat exchange medium to the heat absorbing module 51 lowers the heat absorbing efficiency of the heat absorbing module 51. The condenser 55 ensures complete liquefaction of the heat exchange medium flowing back from the heat releasing module 52 to ensure the heat absorption efficiency of the heat absorbing module 51.

In order to increase the speed of the absorption liquid transferred from the absorption tower 2 to the discharge tower 3, an absorption liquid transfer pump 22 is installed on the second pipe.

In order to facilitate the user to monitor the temperature changes of the cooling tower 1 and the releasing tower 3, a cooling tower thermometer 14 is installed on the cooling tower 1, and a releasing tower thermometer 32 is installed on the releasing tower 3.

Above is only the preferred embodiment of the utility model, the utility model discloses a protection scope does not confine above-mentioned embodiment to, and the all that belongs to the utility model discloses technical scheme under the thinking all belongs to the utility model discloses a protection scope. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A thermoelectric exhaust gas recovery device, comprising:

the device comprises a cooling tower (1), wherein a waste gas inlet (13) and a drain pipe (12) are formed in the cooling tower (1), a first pipeline (11) is connected to the cooling tower (1), and the other end of the first pipeline (11) is connected with an absorption tower (2);

the device comprises an absorption tower (2), wherein a tail gas pipe (83) is connected to the absorption tower (2), the other end of the tail gas pipe (83) is connected with a tail gas treatment device (8), a second pipeline (21) is connected to the absorption tower (2), and the other end of the second pipeline (21) is connected with a release tower (3); absorption liquid is filled in the absorption tower (2);

the device comprises a release tower (3), wherein a third pipeline (31) is connected to the release tower (3), and the other end of the third pipeline (31) is connected with a condensation tower (4);

the condensation tower (4), the condensation tower (4) is connected with a fourth pipeline (41), and the other end of the fourth pipeline (41) is connected with the gas compression device (7);

the heat exchange device (5), the heat exchange device (5) comprises a heat absorption assembly (51), a heat release assembly (52), a circulating pump (53) and a circulating pipe (54), the heat absorption assembly (51) is fixedly connected with the cooling tower (1), the heat release assembly (52) is fixedly connected with the release tower (3), and the heat absorption assembly (51), the heat release assembly (52) and the circulating pump (53) are connected through the circulating pipe (54) to form an annular passage; the heat exchange device is internally provided with a heat exchange medium.

2. The thermoelectric exhaust gas recovery device according to claim 1, characterized in that:

the absorption liquid recovery device (6) is further arranged and comprises a first recovery pump (61), a second recovery pump (62), a first recovery pipe (63) and a second recovery pipe (64), the first recovery pump (61) is installed on the first recovery pipe (63), and the second recovery pump (62) is installed on the second recovery pump (62); one end of the first recovery pipe (63) is connected with the release tower (3), and the other end is connected with the absorption tower (2); one end of the second recovery pipe (64) is connected with the condensing tower (4); the other end is connected with a first recovery pipe (63).

3. The thermoelectric exhaust gas recovery device according to claim 1, characterized in that:

the gas condensation device is also provided with a gas compression device (7) which comprises a gas compressor (71) and a gas storage tank (72), the gas compressor (71) is connected with the condensing tower (4) through a fourth pipeline (41), and the gas storage tank (72) is connected with the gas compressor (71) through a compressed gas pipe (73).

4. The thermoelectric exhaust gas recovery device according to claim 1, characterized in that:

the tail gas treatment device (8) is further arranged and comprises a sulfur fixing device (81) and a tail gas combustion chamber (82), the sulfur fixing device (81), the tail gas combustion chamber (82) and the absorption tower (2) are connected through a tail gas pipe (83), and a tail gas pump (84) is further arranged on the tail gas pipe.

5. The thermoelectric exhaust gas recovery device according to claim 1, characterized in that: a condenser (55) is also arranged in the heat exchange device (5), and the condenser (55) is arranged on one circulating pipe (54).

6. The thermoelectric exhaust gas recovery device according to claim 1, characterized in that: a cooling tower thermometer (14) is arranged on the cooling tower (1); and a release tower thermometer (32) is arranged on the release tower (3).

7. The thermoelectric exhaust gas recovery device according to claim 1, characterized in that: an absorption liquid conveying pump (22) is also arranged on the second pipeline (21).