CN209890576U - Raw coke oven gas washing purifies and low temperature waste heat recovery device - Google Patents
Raw coke oven gas washing purifies and low temperature waste heat recovery device Download PDFInfo
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- CN209890576U CN209890576U CN201920500000.6U CN201920500000U CN209890576U CN 209890576 U CN209890576 U CN 209890576U CN 201920500000 U CN201920500000 U CN 201920500000U CN 209890576 U CN209890576 U CN 209890576U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
A raw coke oven gas washing and purifying and low-temperature waste heat recovery device comprises a washing and cooling tower, a washing liquid pump and a circulating ammonia water and tar separation device, wherein the upper part of the washing and cooling tower is provided with an ammonia water spraying device, the middle part of the washing and cooling tower is an ammonia water washing section, the lower part of the washing and cooling tower is a hot water cooling section, and the bottom of the washing and cooling tower is provided with a liquid breaking disc; the ammonia water spraying device is connected with the circulating ammonia water and tar separation device, the ammonia water outlet of the bottom liquid breaking disc is connected with the washing liquid pump, the washing liquid pump is connected with the circulating ammonia water and tar separation device, the hot water inlet of the hot water cooling section is connected with the low-temperature hot water pipeline, and the hot water outlet of the hot water cooling section is connected with the high-temperature hot water pipeline; the utility model is arranged in front of the coal gas primary cooler. The utility model discloses detach buggy, burnt powder, naphthalene, tar impurity in the coal gas, prevent that the primary cooler from blockking up, retrieve the low temperature heat of raw coke oven gas and the heat of circulation aqueous ammonia simultaneously, obtain 70 ℃ -75 ℃ hot water and can provide the heat source for lithium bromide refrigeration, negative pressure ammonia evaporation, heating in winter, vacuum carbonate desulfurization regeneration and the preheating of thiamine mother liquor.
Description
Technical Field
The utility model relates to a coke oven raw gas washing purifies and low temperature waste heat recovery utilizes's technical field, especially relates to a raw gas washing purifies and low temperature waste heat recovery device.
Background
The temperature of raw gas from the coke oven is about 750 ℃, saturated gas at 80-83 ℃ is formed after the raw gas is sprayed and cooled by circulating ammonia water, the subsequent gas is further cooled to 20-30 ℃ by a primary cooler, the gas contains a large amount of low-temperature steam (about 0.3kg of steam per cubic meter of gas), a large amount of cooling water is consumed for cooling, the low-temperature heat is recovered to obtain hot water at 70-75 ℃, and the heat can be used for lithium bromide refrigeration, negative pressure ammonia distillation, winter heating, vacuum carbonate desulfurization regeneration, ammonium sulfate mother liquor preheating and the like.
Because the environmental protection requirement is becoming strict and the high-pressure ammonia water and the single riser negative pressure control technology are generally applied, the overflow phenomenon of raw gas, coal powder and coke powder is obviously reduced when the coke oven is used for charging and discharging coke, but a large amount of coal powder and coke powder are sucked into the raw gas, the raw gas vaporized and cooled by circulating ammonia water contains a large amount of coal powder, coke powder, tar, naphthalene and the like, the solid coal powder, coke powder, naphthalene and tar are easy to cause the blockage of a primary cooler, great influence is brought to subsequent gas purification, and substances such as coal powder, coke powder, naphthalene, tar and the like in the gas must be removed as much as possible to create extremely favorable conditions for the subsequent gas purification.
Therefore, how to purify the impurities such as coal dust, coke powder, naphthalene, tar and the like in the raw coke oven gas and recover the low-temperature heat in the raw coke oven gas is a subject of the purification of the coking oven gas at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a raw coke oven gas washing purifies and low temperature waste heat recovery device, before the foremost coal gas primary cooler of gas purification unit, impurity such as buggy in the raw coke oven gas, coke breeze, naphthalene, tar are purified in the washing, retrieve the low temperature heat in the raw coke oven gas simultaneously, obtain 70 ℃ -75 ℃ hot water, prevent that the coal gas primary cooler from blockking up, establish good basis for follow-up coal gas cooling purification process, 70 ℃ -75 ℃ hot water can be for lithium bromide refrigeration, the ammonia is evaporated to the negative pressure, heating in winter, vacuum carbonate desulfurization regeneration and sulphur ammonium mother liquor preheat and provide the heat source, improve energy utilization efficiency.
In order to achieve the above object, the utility model adopts the following technical scheme:
a raw coke oven gas washing and purifying and low-temperature waste heat recovery device comprises a washing and cooling tower, a washing liquid pump and a circulating ammonia water and tar separation device, wherein the upper part of the washing and cooling tower is provided with an ammonia water spraying device, the middle part of the washing and cooling tower is an ammonia water washing section, the lower part of the washing and cooling tower is a hot water cooling section, and the bottom of the washing and cooling tower is provided with a liquid breaking disc; an ammonia water inlet of an ammonia water spraying device at the upper part of the washing cooling tower is connected with a circulating ammonia water outlet of a circulating ammonia water and tar separation device through a pipeline, an ammonia water outlet of a liquid breaking disc at the bottom of the washing cooling tower is connected with a washing liquid pump inlet through a pipeline, a washing liquid pump outlet is connected with a circulating ammonia water inlet of the circulating ammonia water and tar separation device through a pipeline, a hot water inlet of a hot water cooling section at the lower part of the washing cooling tower is connected with a low-temperature hot water pipeline, and a hot water outlet of a hot water cooling; the raw gas washing and purifying and low-temperature waste heat recovery device is arranged before the working procedure of a gas primary cooler of the gas purifying unit.
The raw gas washing, purifying and low-temperature waste heat recovery device is independently arranged in front of the gas primary cooler or integrated at the primary section of a gas inlet of the gas primary cooler.
The ammonia water washing section is used for washing by directly contacting gas and liquid, can be an air-jet washing and purifying section, and can also be a filler washing and purifying section, and the height of the section is not less than the diameter of an inscribed circle of the box body.
And a communicating pipe with a valve is arranged between the outlet of the washing liquid pump and the ammonia water inlet of the ammonia water spraying device at the upper part of the washing cooling tower.
The hot water cooling section is an indirect heat exchanger (two media are not in contact).
Compared with the prior art, the beneficial effects of the utility model are that:
1) the utility model discloses an use the raw coke oven gas that thermal cycle aqueous ammonia direct contact mode washing was come from the coke oven, follow the most coal gas of follow and detach buggy, burnt powder, naphthalene, the tar impurity that is brought by the coke oven in the source, protect the coal gas primary cooler, prevent that the primary cooler from blockking up, aqueous ammonia washing liquid gets back to aqueous ammonia tar separator together with the cyclic ammonia water and separates the recycling again.
2) Because the heat circulation ammonia water is used for washing and purifying, the loss of the low-temperature heat of the raw gas can not be caused, simultaneously the low-temperature heat of the raw gas and the heat brought by the heat circulation ammonia water can be recovered, and the obtained hot water with the temperature of 70-75 ℃ can provide a heat source for lithium bromide refrigeration, negative-pressure ammonia evaporation, winter heating, vacuum carbonate desulfurization regeneration and ammonium sulfate mother liquor preheating, thereby improving the energy utilization efficiency.
Drawings
Fig. 1 is a process flow diagram of the present invention.
In the figure: 1-washing cooling tower, 1-1 ammonia water spraying device, 1-2 ammonia water washing sections, 1-3 hot water cooling sections, 1-4 bottom night-breaking discs, 2-washing liquid pump and 3-circulating ammonia water tar separation device.
Detailed Description
The following further illustrates embodiments of the present invention:
as shown in figure 1, the raw coke oven gas washing, purifying and low-temperature waste heat recovery device comprises a washing and cooling tower 1, a washing liquid pump 2 and a circulating ammonia water and tar separation device 3, wherein the upper part of the washing and cooling tower 1 is provided with an ammonia water spraying device 1-1, the middle part is an ammonia water washing section 1-2, the lower part is a hot water cooling section 1-3, and the bottom is provided with a liquid breaking disc 1-4; the upper gas inlet of the washing and cooling tower 1 is connected with a raw gas pipeline, and the lower gas outlet of the washing and cooling tower 1 is connected with a subsequent gas pipeline; an ammonia water inlet of an ammonia water spraying device 1-1 at the upper part of a washing cooling tower 1 is connected with a circulating ammonia water and tar separation device 3 through a pipeline, an ammonia water outlet of a liquid breaking disc 1-4 at the bottom of the washing cooling tower 1 is connected with an inlet of a washing liquid pump 2 through a pipeline, an outlet of the washing liquid pump 2 is connected with a circulating ammonia water and tar separation device 3 through a pipeline, a hot water inlet 1-3 at the lower part of the washing cooling tower 1 is connected with a low-temperature hot water pipeline to receive returned low-temperature hot water, and a hot water outlet 1-3 at the lower part of the washing cooling tower 1 is connected with a high-temperature hot water pipeline to send high-temperature; the raw gas washing and purifying and low-temperature waste heat recovery device is arranged before the working procedure of a gas primary cooler of the gas purifying unit.
The raw gas washing, purifying and low-temperature waste heat recovery device is independently arranged in front of the gas primary cooler or integrated at the primary section of a gas inlet of the gas primary cooler.
And a communicating pipe with a valve is arranged between the outlet of the washing liquid pump 2 and the ammonia water inlet of the ammonia water spraying device 1-1 at the upper part of the washing cooling tower 1.
An inlet of an ammonia water spraying device 1-1 at the upper part of the washing cooling tower 1 is connected with a nozzle combination device, and is refined and uniformly distributed through the pressure of the nozzle combination device, so that fine liquid drops are fully contacted with raw coke oven gas in an ammonia water washing section 1-2, and the raw coke oven gas is washed and purified to remove impurities such as coal powder, coke powder, naphthalene, tar and the like.
The lower hot water cooling section 1-3 is an indirect heat exchanger. The indirect heat exchanger can be a tube type, a plate type or a spiral plate type.
The ammonia water washing section 1-2 is an air-jet washing and purifying section or a filler washing and purifying section. The height of the ammonia water washing section 1-2 is not less than the diameter of an inscribed circle of the washing cooling tower box body.
A raw gas washing and purifying and low-temperature waste heat recovery process is characterized in that impurities containing coal powder, coke powder, tar and naphthalene in raw gas are washed and removed before a gas primary cooler of a gas purifying unit, the impurities are used for protecting the gas primary cooler, preventing the gas primary cooler from being blocked, and simultaneously, waste heat recovery is carried out on the raw gas to heat low-temperature hot water; the specific process comprises the following steps:
before entering a coal gas primary cooler of a coal gas purification unit, 80-83 ℃ saturated raw coal gas enters a middle ammonia water washing section 1-2 from a coal gas inlet at the top of a washing cooling tower 1, 75-80 ℃ circulating ammonia water sent from a circulating ammonia water outlet of a circulating ammonia water and tar separation device 3 enters an ammonia water spraying device 1-1 at the upper part of the washing cooling tower 1 through an inlet of a nozzle combination device to be subjected to pressure refining and uniform distribution of fine liquid drops, and the coal powder and the coke powder contained in the coal gas are removed by washing and purification, the impurities of tar and naphthalene enter a hot water cooling section 1-3 at the lower part of a washing cooling tower 1 together with coal gas and ammonia water washing liquid from the lower part of a middle ammonia water washing section 1-2 to indirectly exchange heat with hot water to be cooled, the temperature of the cooled coal gas is 70-75 ℃, and the cooled coal gas is sent to a coal gas primary cooler after ammonia water washing liquid is separated from the cooled coal gas through a bottom liquid breaking disc 1-4;
the ammonia water washing liquid containing impurities is separated out of coal gas from a bottom liquid breaking disc 1-4, then sent to a circulating ammonia water and tar separation device 3 through a washing liquid pump 2, and enters from a circulating ammonia water inlet to be separated from tar, coal powder and coke powder together with the circulating ammonia water for recycling; the temperature of the ammonia water washing liquid returned to the circulating ammonia water tar separation device 3 from the outlet at the bottom of the washing cooling tower 1 is 70-75 ℃.
The low-temperature hot water with the temperature of 60-65 ℃ returned by the user enters the hot water cooling section 1-3 at the lower part of the washing and cooling tower 1, is heated to 70-75 ℃ by the coal gas and ammonia water washing liquid and then is sent to the hot water user.
The technical process of the utility model can also be that coal gas enters from bottom to top. When the raw gas enters the upper part, the raw gas washing and purifying and low-temperature waste heat recovery device and the gas primary cooler can be integrally arranged at the upper part of the gas primary cooler; when the coal gas enters downwards, the raw gas washing and purifying and low-temperature waste heat recovery device and the coal gas primary cooler can be integrally arranged at the lower part of the coal gas primary cooler.
Although the above description has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and on the basis of the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative efforts are still within the scope of the present invention.
Claims (4)
1. A raw gas washing and purifying and low-temperature waste heat recovery device is characterized by comprising a washing and cooling tower, a washing liquid pump and a circulating ammonia water and tar separation device, wherein an ammonia water spraying device is arranged at the upper part of the washing and cooling tower, an ammonia water washing section is arranged at the middle part, a hot water cooling section is arranged at the lower part, and a liquid breaking disc is arranged at the bottom; an ammonia water inlet of an ammonia water spraying device at the upper part of the washing cooling tower is connected with a circulating ammonia water outlet of a circulating ammonia water tar separation device through a pipeline, an ammonia water outlet of a liquid breaking disc at the bottom of the washing cooling tower is connected with a washing liquid pump inlet through a pipeline, an outlet of the washing liquid pump is connected with a circulating ammonia water inlet of the circulating ammonia water tar separation device through a pipeline, and a communicating pipe with a valve is arranged between the outlet of the washing liquid pump and the ammonia water inlet of the ammonia water spraying device at the; a hot water inlet of a hot water cooling section at the lower part of the washing and cooling tower is connected with a low-temperature hot water pipeline, and a hot water outlet of the hot water cooling section at the lower part of the washing and cooling tower is connected with a high-temperature hot water pipeline; the raw gas washing and purifying and low-temperature waste heat recovery device is arranged before the working procedure of a gas primary cooler of the gas purifying unit.
2. The raw coke oven gas washing, purifying and low-temperature waste heat recycling device as claimed in claim 1, wherein the raw coke oven gas washing, purifying and low-temperature waste heat recycling device is arranged before the gas primary cooler independently or is integrated in the primary section of the gas inlet of the gas primary cooler.
3. The raw coke oven gas washing and purifying and low-temperature waste heat recovery device as claimed in claim 1, wherein the ammonia water washing section is a gas-liquid direct contact washing and purifying section, and is an air-spraying washing and purifying section or a filler washing and purifying section.
4. The raw coke oven gas washing and purifying and low-temperature waste heat recovery device as claimed in claim 1, wherein the hot water cooling section is an indirect heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920500000.6U CN209890576U (en) | 2019-04-12 | 2019-04-12 | Raw coke oven gas washing purifies and low temperature waste heat recovery device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920500000.6U CN209890576U (en) | 2019-04-12 | 2019-04-12 | Raw coke oven gas washing purifies and low temperature waste heat recovery device |
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| CN209890576U true CN209890576U (en) | 2020-01-03 |
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| CN201920500000.6U Active CN209890576U (en) | 2019-04-12 | 2019-04-12 | Raw coke oven gas washing purifies and low temperature waste heat recovery device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109929596A (en) * | 2019-04-12 | 2019-06-25 | 济南冶金化工设备有限公司 | A kind of raw coke oven gas washing, purifying and low temperature exhaust heat recyclable device and technique |
-
2019
- 2019-04-12 CN CN201920500000.6U patent/CN209890576U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109929596A (en) * | 2019-04-12 | 2019-06-25 | 济南冶金化工设备有限公司 | A kind of raw coke oven gas washing, purifying and low temperature exhaust heat recyclable device and technique |
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