CN217541581U - Waste heat recovery device for VOC gas of coking plant - Google Patents
Waste heat recovery device for VOC gas of coking plant Download PDFInfo
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- CN217541581U CN217541581U CN202220392392.0U CN202220392392U CN217541581U CN 217541581 U CN217541581 U CN 217541581U CN 202220392392 U CN202220392392 U CN 202220392392U CN 217541581 U CN217541581 U CN 217541581U
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Abstract
The utility model discloses a coke-oven plant VOC gas recovery waste heat device, including pretreatment systems and the heat transfer dust remover who is connected with pretreatment systems, set up the intake pipe that lets the VOC gas get into and let VOC gas exhaust's outlet duct on the heat transfer dust remover, heat exchanger tube side in the heat transfer dust remover is located the below of intake pipe and is located the top of outlet duct. The utility model discloses a coke-oven plant VOC gas recovery waste heat device uses the VOC gas that the steam condensate water heating entered the coke oven burning, improves the temperature that the gas got into the coke oven, but the heat of recycle steam condensate water practices thrift the required heat of coking.
Description
Technical Field
The utility model belongs to the exhaust-gas treatment of coke-oven plant technique, specifically speaking, the utility model relates to a coke-oven plant VOC gas recovery waste heat device.
Background
The coking industry VOCs (volatile organic compounds) has wide sources, various types and high toxicity, and causes serious pollution to the environment. Common volatile gases include tar gas, ammonia gas, hydrogen cyanide, hydrogen sulfide, non-methane total hydrocarbons, and the like. The pollutants are distributed in the whole production section, and the characteristic pollutant components, concentrations and discharge temperatures of different sections are different, so that VOCs in the whole coking industry are discharged with the following characteristics: more discharge nodes, large difference, complex components, heavy peculiar smell, low recovery value and the like.
Common techniques for treating VOCs include: thermal destruction, adsorption, biological treatment, oxidation, condensation recovery, and the like. With the official promulgation of the emission standard of pollutants for coking chemical industry, the technology used before is difficult to meet the existing high standard requirements, the VOCs are mostly returned to the coke oven for combustion in the coking enterprises at present, the treatment effect is good, but the method has the defects of low combustion efficiency, high overall operation cost, interference on coking and influence on the normal operation of production.
According to the practical handbook for treating volatile organic compounds in the coking industry, the method needs to be started from the aspects of source reduction, process control terminal treatment and the like, and has a guiding function on the treatment of the whole VOCs. The utility model relates to a VOCs gas, which can lead the collected waste gas into a negative pressure pipeline, lead a gas negative pressure pipeline to be mixed into the gas, and purify the tail gas by using a complete gas purification process; the combustion, absorption and adsorption processes are adopted.
Patent document CN109173678A discloses a method and a device for treating VOCs tail gas of a coke-oven plant, and the invention teaches a method for treating VOCs and then feeding the treated VOCs into a coke oven for combustion treatment. The gas pretreatment comprises the steps of removing acid, alkali, tar, naphthalene and other components, condensing the gas collected from each section to reduce naphthalene, tar and other substances entering the coke oven, and finally entering the coke oven waste gas shutter together with air for combustion treatment. However, the VOC tail gas treatment method does not treat or preheat VOCs tail gas and then enter a coke oven for combustion.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a coke-oven plant VOC gas recovery waste heat device, the purpose is practiced thrift the coking heat consumption.
In order to realize the purpose, the utility model discloses the technical scheme who takes does: gaseous recovery waste heat device of coke-oven plant VOC, including pretreatment systems and the heat transfer dust remover of being connected with pretreatment systems, set up the intake pipe that lets the gaseous entering of VOC and let the gaseous exhaust outlet duct of VOC on the heat transfer dust remover, the heat exchanger tube side in the heat transfer dust remover is located the below of intake pipe and is located the top of outlet duct.
The pretreatment system comprises an acid washing tower, an alkaline washing tower connected with the acid washing tower and a booster fan connected with the alkaline washing tower.
And a gas collecting hood connected with the gas inlet of the gas outlet pipe is arranged in the heat exchange dust remover and is of a conical structure.
And a spray head is arranged in the heat exchange dust remover and is positioned between the air inlet pipe and the heat exchanger tube pass.
The temperature of the steam condensed water entering the tube pass of the heat exchanger reaches over 100 ℃.
The booster fan adopts a variable-frequency explosion-proof motor.
The heat exchange dust remover is connected with the pretreatment system through a water-sealed flame arrester.
The heat exchange dust remover is connected with the mechanical flame arrester, and the heat exchange dust remover is positioned between the mechanical flame arrester and the pretreatment system.
The utility model discloses a waste heat device is retrieved to coke-oven plant VOC gas uses the heating of steam condensate water to enter the VOC gas of coke oven burning, improves the temperature that gaseous entering coke oven, but the heat of recycle steam condensate water practices thrift the required heat of coking.
Drawings
The present specification includes the following figures, which show the contents:
FIG. 1 is a schematic structural diagram of a waste heat recovery device for VOC gas of a coke-oven plant;
FIG. 2 is a schematic diagram of a heat exchange dust collector;
labeled as: 1. an acid washing tower; 2. an alkaline washing tower; 3. a booster fan; 4. a water-sealed flame arrestor; 5. a heat exchange dust remover; 6. a coke oven shutter; 7. an air inlet pipe; 8. an air outlet pipe; 9. emptying the pipe; 10. a spray head; 11. a gas-collecting hood; 12. a manhole for cleaning.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation.
As shown in FIG. 1 and FIG. 2, the utility model provides a coke-oven plant VOC gas recovery waste heat device, including pretreatment systems and the heat transfer dust remover 5 of being connected with pretreatment systems, set up the intake pipe 7 that lets the VOC gas get into and let VOC gas exhaust outlet duct 8 on the heat transfer dust remover 5, the heat exchanger tube side in the heat transfer dust remover 5 is located the below of intake pipe 7 and is located the top of outlet duct 8.
Specifically, as shown in fig. 1, the pretreatment system includes an acid washing tower 1, a caustic washing tower 2 connected to the acid washing tower 1, and a booster fan 3 connected to the caustic washing tower 2. VOCs gases such as waste gas from power branch plants, waste gas from a desulfurization section, waste gas from an ammonium sulfate section, a salt extraction section and waste gas from an oil depot section are collected, and are subjected to pretreatment procedures such as acid washing and alkali washing, and then are converged and pressurized by a booster fan 3, and then enter a heat exchange dust remover 5, wherein the pressure of the VOCs gas pressurized by the booster fan 3 is 1-20KPa. VOCs gas pretreated by acid washing, alkali washing and the like enters a tube nest of a heat exchanger tube side from an air inlet pipe 7 at the top end of the heat exchanger, goes out from an air outlet pipe 8 at the lower part of the side of a heat exchange dust remover 5, steam condensate water enters the heat exchanger tube side, the flow direction of the steam condensate water enters from bottom to top, a water inlet pipe is arranged at the lower end of the heat exchanger tube side, a water outlet pipe is arranged at the upper end of the heat exchanger tube side, VOCs gas flowing through the heat exchanger tube side and the steam condensate water carry out countercurrent heat exchange, various impurities in the VOCs gas can be precipitated, the VOCs gas can be discharged from an emptying pipe 9 and a hand hole which are arranged at the bottom of the heat exchange dust remover 5, the VOCs gas cannot enter a coke oven, the influence on the coke oven is reduced, and the VOCs gas can be heated to 80-90 ℃ by the method.
As shown in fig. 2, a gas-collecting hood 11 connected to the gas inlet of the gas outlet pipe 8 is disposed in the heat exchange dust collector 5, and the gas-collecting hood 11 is of a conical structure. The gas collecting channel 11 has a large diameter end and a small diameter end, the diameter of the large diameter end of the gas collecting channel 11 is larger than that of the small diameter end, the large diameter end of the gas collecting channel 11 is located below the small diameter end, and the small diameter end of the gas collecting channel 11 is connected with the gas inlet of the gas outlet pipe 8. The gas collecting hood 11 with the inverted cone hopper shape is beneficial to reducing disturbance of an outward-sent gas flow, so that dust can be well settled, and solid particles contained in VOCs gas are deposited in the lower cone hopper of the heat exchanger as far as possible and cannot be brought out to the coke oven shutter 6 and even to checker bricks of a coke oven regenerator.
As shown in FIG. 2, a spray head 10 is arranged in the heat exchange dust remover 5, and the spray head 10 is positioned between the air inlet pipe 7 and the tube pass of the heat exchanger. The spray head 10 is connected with a liquid supply system positioned outside the heat exchange dust remover 5, the liquid supply system provides cleaning liquid for the spray head 10, the spray head 10 sprays the cleaning liquid to a heat exchanger tube pass below, and the inner wall of a heat exchanger pipeline can be cleaned when the inner wall of the heat exchanger pipeline is blocked or cleaned periodically to prevent the pipeline from being blocked.
As shown in fig. 2, a cleaning manhole 12 is provided at the bottom of the heat-exchange dust collector 5, and dust can be manually cleaned even when there is a large amount of dust accumulated in the interior.
The steam condensate used in the heat exchange dust remover 5 preferably adopts steam condensate which is not subjected to low-pressure flash evaporation, namely, a flash evaporation device of medium-pressure steam, such as a flash evaporation tank with the flash evaporation pressure of 0.5-0.7MPa, is utilized, the temperature of the steam condensate extruded by the self-pressure can reach more than 150 ℃, the steam condensate has higher enthalpy, and the resistance of a conveying pipeline can be overcome by utilizing the self-pressure of the steam condensate. The temperature of the steam condensate entering the heat exchanger is displayed by utilizing the temperature of the steam condensate entering the heat exchanger and exiting the heat exchanger, and the temperature of the steam condensate entering the heat exchanger is enabled to reach more than 130 ℃ by controlling the valve, so that the heat exchange area is reduced, and the heat exchange efficiency is improved.
As shown in fig. 2, the bottom of the heat exchange dust collector 5 is provided with an emptying pipe 9, the emptying pipe 9 is positioned below the air outlet pipe 8, the emptying pipe 9 is provided with a valve group, and the valve group is preferably set as a double valve to ensure safety and reliability and facilitate maintenance and cleaning of discharged ash. As an optimized scheme, the double valves can be set to be automatic, and automatic ash discharge is achieved.
As shown in figures 1 and 2, an air outlet pipe 8 is connected with a coke oven shutter 6, an explosion-proof membrane or a safety valve is arranged between the air outlet pipe 8 and the coke oven shutter 6, and the VOCs gas passes through a heat exchange dust remover 5 to reach a coke oven pipeline to be provided with the explosion-proof membrane or the safety valve so as to prevent the explosion caused by the tempering of the coke oven. And the pipelines from the VOCs gas passing through the heat exchanger to the front of the coke oven shutter 6 are required to be insulated.
Preferably, the booster fan 3 adopts a variable-frequency explosion-proof motor, a pipeline behind the heat exchanger is provided with an online VOCs gas pressure gauge, the fan is interlocked with the gas pressure gauge, when the VOCs gas pressure behind the heat exchanger exceeds 10-20KPa, the fan reduces the rotating speed and reduces the air supply quantity, when the VOCs gas pressure exceeds 20KPa, the fan is stopped, the fan is opened in front of the machine, and the diffused gas is directly discharged after being processed by the active carbon purification device. The operation safety of the coke oven system and the VOCs device is ensured.
As shown in fig. 1 and 2, the heat exchange dust remover 5 is connected with the pretreatment system through a water-sealed flame arrester 4, and the air outlet of the booster fan 3 is connected with the air inlet of the water-sealed flame arrester 4. The gas outlet of water seal formula spark arrester 4 is connected with the air inlet of intake pipe 7, and heat transfer dust remover 5 is located behind water seal formula spark arrester 4 to prevent after this device heat transfer, when passing through the water seal again, can absorb moisture, reduce the temperature.
As a variant, the heat-exchanging dust remover is connected to a mechanical flame arrester, the heat-exchanging dust remover being located between the mechanical flame arrester and the pretreatment system. The air outlet of the booster fan is connected with the air inlet of the air inlet pipe, the air outlet pipe is connected with the mechanical flame arrester, and the mechanical flame arrester is connected with the coke oven shutter. Before the spark arrester was arranged in to the heat transfer dust remover, because this heat transfer device has certain function of removing the impurity granule, be difficult to make subsequent piping installation (like the spark arrester) block up, so recommend adopt mechanical type spark arrester to arrange this heat transfer device in after, as the optimal combination.
The invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-described manner. Various insubstantial improvements are made by adopting the method conception and the technical proposal of the utility model; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.
Claims (8)
1. Gaseous waste heat recovery device of coke-oven plant VOC, its characterized in that: the device comprises a pretreatment system and a heat exchange dust remover connected with the pretreatment system, wherein an air inlet pipe for allowing VOC gas to enter and an air outlet pipe for allowing the VOC gas to be discharged are arranged on the heat exchange dust remover, and a heat exchanger tube side in the heat exchange dust remover is positioned below the air inlet pipe and above the air outlet pipe.
2. The coke-oven plant VOC gas recovery waste heat device of claim 1, characterized in that: the pretreatment system comprises an acid washing tower, an alkaline washing tower connected with the acid washing tower and a booster fan connected with the alkaline washing tower.
3. The coke-oven plant VOC gas recovery waste heat device of claim 1 or 2, characterized in that: and a gas collecting hood connected with the gas inlet of the gas outlet pipe is arranged in the heat exchange dust remover, and the gas collecting hood is of a conical structure.
4. The coke-oven plant VOC gas recovery waste heat plant of claim 1 or 2, characterized in that: and a spray head is arranged in the heat exchange dust remover and is positioned between the air inlet pipe and the heat exchanger tube pass.
5. The coke-oven plant VOC gas recovery waste heat device of claim 1 or 2, characterized in that: the temperature of the steam condensed water entering the tube pass of the heat exchanger reaches over 100 ℃.
6. The coke-oven plant VOC gas recovery waste heat device of claim 2, characterized in that: the booster fan adopts a variable-frequency explosion-proof motor.
7. The coke-oven plant VOC gas recovery waste heat device of claim 1 or 2, characterized in that: the heat exchange dust remover is connected with the pretreatment system through a water seal type flame arrester.
8. The coke-oven plant VOC gas recovery waste heat device of claim 1 or 2, characterized in that: the heat exchange dust remover is connected with the mechanical flame arrester, and the heat exchange dust remover is positioned between the mechanical flame arrester and the pretreatment system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220392392.0U CN217541581U (en) | 2022-02-25 | 2022-02-25 | Waste heat recovery device for VOC gas of coking plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220392392.0U CN217541581U (en) | 2022-02-25 | 2022-02-25 | Waste heat recovery device for VOC gas of coking plant |
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| CN217541581U true CN217541581U (en) | 2022-10-04 |
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| CN202220392392.0U Active CN217541581U (en) | 2022-02-25 | 2022-02-25 | Waste heat recovery device for VOC gas of coking plant |
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