CN212747371U - Process unit for acid making waste heat utilization and tail gas comprehensive treatment - Google Patents
Process unit for acid making waste heat utilization and tail gas comprehensive treatment Download PDFInfo
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- CN212747371U CN212747371U CN202021273506.7U CN202021273506U CN212747371U CN 212747371 U CN212747371 U CN 212747371U CN 202021273506 U CN202021273506 U CN 202021273506U CN 212747371 U CN212747371 U CN 212747371U
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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 process unit for utilizing acid making waste heat and comprehensively treating tail gas comprises an incinerator, a cooling and purifying system, a converter, a condensing cooler and a coke oven desulfurization and denitrification system; the converter comprises a first section of catalyst layer, a first section of heat exchanger, a second section of catalyst layer, a second section of heat exchanger, a third section of catalyst layer and a third section of heat exchanger, wherein the first section of catalyst layer, the first section of heat exchanger, the second section of catalyst layer, the second section of heat exchanger, the third section of catalyst layer and the third section of heat exchanger are sequentially arranged from top to bottom; the utility model discloses a coke oven flue gas desulfurization and denitration system SOx/NOx control integrated treatment is sent to the reaction heat back of tail gas recovery converter, has saved original tail gas washing, active carbon adsorption and regenerating unit, has avoided the production of regeneration diluted acid. The cooling air of the condensing cooler is heated by the converter and is sent to the incinerator for combustion air, so that the heat efficiency of the system is improved, and the energy consumption is reduced.
Description
Technical Field
The utility model relates to an acidation technical field especially relates to a process units who makes sour waste heat utilization and tail gas integrated processing.
Background
Wet oxidation desulfurization with simple process and desulfurization (H)2S) has the characteristic of high efficiency and is widely applied to the desulfurization process of coke oven gas, the desulfurized low-quality sulfur and the byproduct salt waste liquid are used as important matched environment-friendly facilities of the desulfurization process, the tail gas generated in acid preparation by burning is not directly discharged after being washed as the environmental protection becomes stricter day by day, the existing tail gas treatment, upgrading and modification method is generally activated carbon adsorption treatment, firstly, the investment and operation cost is high, and secondly, the activated carbon is regenerated to generate dilute acid waste liquid.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a process units of sour waste heat utilization and tail gas integrated processing, the utility model discloses the heat of reasonable recycle converter heats tail gas and condenser cooler cooling air, makes tail gas reach current coke oven flue gas desulfurization and denitration's operating temperature and send into coke oven flue gas desulfurization and denitration system integrated processing together, and condenser cooler cooling air preheats and send burning furnace as combustion air for high temperature air, reduces to burn burning furnace energy resource consumption, realizes energy saving and emission reduction.
In order to achieve the above object, the utility model adopts the following technical scheme:
a process unit for utilizing acid making waste heat and comprehensively treating tail gas comprises an incinerator, a cooling and purifying system, a converter, a condensing cooler and a coke oven desulfurization and denitrification system; the converter comprises a first section of catalyst layer, a first section of heat exchanger, a second section of catalyst layer, a second section of heat exchanger, a third section of catalyst layer and a third section of heat exchanger, wherein the first section of catalyst layer, the first section of heat exchanger, the second section of catalyst layer, the second section of heat exchanger, the third section of catalyst layer and the third section of heat exchanger are sequentially arranged from top to bottom; the device comprises an incinerator process gas outlet, a cooling and purifying system inlet, a converter process gas inlet, a condenser cooler process gas outlet, a converter three-section heat exchanger tail gas inlet, a converter three-section heat exchanger tail gas outlet, a coke oven flue gas desulfurization and denitrification system, a coke oven; cooling air is fed from a shell pass air inlet of the condensing cooler, a shell pass air outlet of the condensing cooler is connected with an air inlet of a second-stage heat exchanger of the converter through a pipeline, and an air outlet of the second-stage heat exchanger of the converter is connected with an air inlet of the first-stage heat exchanger of the converter through a pipeline; the air outlet of the first-stage heat exchanger of the converter is divided into two paths, one path is connected with the air inlet of the incinerator, and the other path is connected with the tail gas outlet of the tube pass of the condensing cooler.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the reaction heat of the tail gas recovery converter is preheated to the temperature (above 180 ℃) required by low-temperature denitration, and is sent to a coke oven flue gas desulfurization and denitration system to be subjected to desulfurization and denitration comprehensive treatment together with the coke oven flue gas, so that the original tail gas washing, activated carbon adsorption and regeneration devices are omitted, and the generation of regenerated dilute acid is avoided.
2) The cooling air of the condensing cooler is further heated into high-temperature (300-400 ℃) preheated air through the converter and is sent to the incinerator for combustion air, the heat efficiency of the system is improved, and energy consumption is reduced.
Drawings
Fig. 1 is a process flow diagram of the present invention.
In the figure: the system comprises a 1-incinerator, a 2-cooling purification system, a 3-converter, a 3-1 section of catalyst layer, a 3-2 section of heat exchanger, a 3-3 section of catalyst layer, a 3-4 section of heat exchanger, a 3-5 section of catalyst layer, a 3-6 section of heat exchanger, a 4-condensing cooler, a 5-coke oven desulfurization and denitrification system, 6-tail gas, 7-cooling air, 8-compressed air, 9-process gas, 10-high temperature air, 11-sulfur paddle and 12-coke oven flue gas.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings:
in the process of burning sulfuric acid by using low-quality sulfur generated by wet oxidation and desulfurization of coke oven gas and salt waste liquid containing sulfur as raw materials, tail gas 6 and cooling air 7 from a condensation cooler 4 are heated by heat of a converter 3, so that the tail gas 6 reaches the operating temperature required by a coke oven flue gas desulfurization and denitrification system 5 and is sent to the coke oven flue gas desulfurization and denitrification system 5 for comprehensive treatment, and after the cooling air 7 from the condensation cooler is preheated to high-temperature air 10, part or all of the cooling air is sent to an incinerator 1 as high-temperature combustion-supporting air.
Returning the tail gas 6 with the temperature of 90-160 ℃ coming out of the condensation cooler 4 to the bottom of the converter 3, exchanging heat with the process gas 9 through a heat exchanger to recover reaction heat, heating the tail gas 6 to 180-280 ℃ to meet the temperature requirement for low-temperature denitration of coke oven flue gas, and sending the tail gas 6 to a coke oven flue gas desulfurization and denitration system 5 to perform desulfurization and denitration together with the coke oven flue gas 12 to remove trace SO in the tail gas2、SO3And NOX。
Cooling air 7 with the temperature of 170-210 ℃ coming out of the condensation cooler 4 enters the converter 3, reaction heat is recovered through heat exchange of a heat exchanger and process gas 9, the cooling air 7 is heated into high-temperature air 10 with the temperature of 300-400 ℃, and a part of the cooling air is used as high-temperature combustion-supporting air to be sent to the incinerator 1.
The other part (5-20%) of the high-temperature air 10 from the heat exchanger of the converter is sent to the upper part (tail gas side) of the tube pass of the condensing cooler 4 to be mixed with the discharged tail gas 6, so that the superheat degree of the tail gas from the condensing cooler 4 is improved.
The utility model adopts ammonia as alkali source as follows: low-quality sulfur produced by coke oven gas wet oxidation desulfurization process with HPF, PDS and the like as catalysts and salt waste liquid containing sulfur element as raw materials, and process method for waste heat utilization and tail gas comprehensive treatment of process for preparing sulfuric acid by burning sulfur pulp waste liquid
As shown in fig. 1, a process device for utilizing acid making waste heat and comprehensively treating tail gas comprises an incinerator 1, a cooling and purifying system 2, a converter 3, a condensing cooler 4 and a coke oven desulfurization and denitrification system 5; the converter 3 comprises a first section catalyst layer 3-1, a first section heat exchanger 3-2, a second section catalyst layer 3-3, a second section heat exchanger 3-4, a third section catalyst layer 3-5 and a third section heat exchanger 3-6, wherein the first section catalyst layer 3-1, the first section heat exchanger 3-2, the second section catalyst layer 3-3, the second section heat exchanger 3-4, the third section catalyst layer 3-5 and the third section heat exchanger 3-6 are sequentially arranged from top to bottom; the process gas outlet of the incinerator 1 is connected with the inlet of the cooling and purifying system 2 through a pipeline, the process gas outlet of the cooling and purifying system 2 is connected with the process gas inlet of the converter 3 through a pipeline, the process gas outlet of the converter 3 is connected with the tube pass inlet of the condensing cooler 4 through a pipeline, the tube pass tail gas outlet of the condensing cooler 4 is connected with the tail gas inlet of the three-section heat exchanger 3-6 of the converter through a pipeline, and the tail gas outlet of the three-section heat exchanger 3-6 of the converter is connected with the flue gas desulfurization and denitrification system 5 of the coke oven through a pipeline; cooling air 7 is fed from a shell side air inlet of a condensing cooler 4, a shell side air outlet of the condensing cooler 4 is connected with an air inlet of a second-stage heat exchanger 3-4 of the converter through a pipeline, and an air outlet of the second-stage heat exchanger 3-4 of the converter is connected with an air inlet of a first-stage heat exchanger 3-2 of the converter through a pipeline; the air outlet of the first section heat exchanger 3-2 of the converter is divided into two paths, one path is connected with the air inlet of the incinerator 1, and the other path is connected with the pipe pass tail gas outlet of the condensing cooler 4.
The converter 3 is typically a three-bed catalyst SO2Conversion to SO3The reactor of (1).
The condensate cooler 4 is typically a high temperature sulfuric acid corrosion resistant glass tube condensate cooler with process gas 9 on the tube side and cooling air 7 on the shell side.
The first-stage heat exchanger 3-2, the second-stage heat exchanger 3-4 and the third-stage heat exchanger 3-6 in the converter 3 can also be separately arranged from the converter.
The incinerator 1, the cooling purification system 2 and the coke oven desulfurization and denitrification system 5 are the prior art or devices.
The embodiment of the utility model provides a concrete technological process as follows:
1) the sulfur slurry 11 is atomized and sprayed into the incinerator 1 by the compressed air 8 to be mixed with the high-temperature combustion air from the converter 3, and is then mixed in the incinerator 1Burning to generate SO at 950-1100 deg.C2The process gas 9 is cooled to 380-420 ℃ by a cooling and purifying system 2, purified and dedusted, and then sent into a converter 3, and SO is converted in the converter 3 under the action of a catalyst2Conversion to SO3SO-containing gas from the converter 33The process gas 9 enters the condensing cooler 4 to be condensed and cooled to separate out concentrated sulfuric acid, and tail gas 6 (with the temperature of 90-110 ℃) is discharged from the top of the condensing cooler 4.
2) The tail gas 6 discharged from the top of the condensing cooler 4 is mixed with part (10%) of high-temperature air 10 from the first-stage heat exchanger 3-2 of the converter 3 to increase the temperature (120-140 ℃) of the tail gas 6, and then the tail gas is sent into the three-stage heat exchanger 3-6 of the converter 3 to exchange heat, heated to 230-270 ℃, sent into the coke oven desulfurization and denitrification system 5 to be mixed with the coke oven flue gas 12 to be subjected to desulfurization and denitrification treatment together.
3) Cooling air 7 (the temperature is 170-210 ℃) from the condensing cooler 4 enters a second-stage heat exchanger 3-4 of the converter 3 and a first-stage heat exchanger 3-2 of the converter 3 for heat exchange to be heated to 350-400 ℃, most (90%) of high-temperature air 10 from the first-stage heat exchanger 3-2 of the converter 3 is sent to the incinerator 1 as combustion air, and a small part (10%) of high-temperature air is sent to a tail gas outlet at the top of a tube pass of the condensing cooler 4 to be mixed with tail gas so as to improve the superheat degree of the tail gas.
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 (1)
1. A process unit for utilizing acid making waste heat and comprehensively treating tail gas is characterized by comprising an incinerator, a cooling and purifying system, a converter, a condensing cooler and a coke oven desulfurization and denitrification system; the converter comprises a first section of catalyst layer, a first section of heat exchanger, a second section of catalyst layer, a second section of heat exchanger, a third section of catalyst layer and a third section of heat exchanger, wherein the first section of catalyst layer, the first section of heat exchanger, the second section of catalyst layer, the second section of heat exchanger, the third section of catalyst layer and the third section of heat exchanger are sequentially arranged from top to bottom; the device comprises an incinerator process gas outlet, a cooling and purifying system inlet, a converter process gas inlet, a condenser cooler process gas outlet, a converter three-section heat exchanger tail gas inlet, a converter three-section heat exchanger tail gas outlet, a coke oven flue gas desulfurization and denitrification system, a coke oven; cooling air is fed from a shell pass air inlet of the condensing cooler, a shell pass air outlet of the condensing cooler is connected with an air inlet of a second-stage heat exchanger of the converter through a pipeline, and an air outlet of the second-stage heat exchanger of the converter is connected with an air inlet of the first-stage heat exchanger of the converter through a pipeline; the air outlet of the first-stage heat exchanger of the converter is divided into two paths, one path is connected with the air inlet of the incinerator, and the other path is connected with the tail gas outlet of the tube pass of the condensing cooler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021273506.7U CN212747371U (en) | 2020-07-02 | 2020-07-02 | Process unit for acid making waste heat utilization and tail gas comprehensive treatment |
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| CN202021273506.7U CN212747371U (en) | 2020-07-02 | 2020-07-02 | Process unit for acid making waste heat utilization and tail gas comprehensive treatment |
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| CN212747371U true CN212747371U (en) | 2021-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841310A (en) * | 2020-07-02 | 2020-10-30 | 宁波科新化工工程技术有限公司大连分公司 | Acid making waste heat utilization and tail gas comprehensive treatment process and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841310A (en) * | 2020-07-02 | 2020-10-30 | 宁波科新化工工程技术有限公司大连分公司 | Acid making waste heat utilization and tail gas comprehensive treatment process and device |
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