CN106867547B - Coke oven crude gas waste heat recovery system - Google Patents
Coke oven crude gas waste heat recovery system Download PDFInfo
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- CN106867547B CN106867547B CN201710197257.4A CN201710197257A CN106867547B CN 106867547 B CN106867547 B CN 106867547B CN 201710197257 A CN201710197257 A CN 201710197257A CN 106867547 B CN106867547 B CN 106867547B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B27/00—Arrangements for withdrawal of the distillation gases
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B41/00—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
- C10B41/08—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke for the withdrawal of the distillation gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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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
The invention discloses a coke oven raw gas waste heat recovery system, which mainly aims at the conditions that the steam quantity and the steam quality generated by the existing coke oven raw gas waste heat recovery system are not ideal, and provides a coke oven raw gas waste heat recovery system capable of comprehensively recovering the coke oven raw gas waste heat, and the coke oven raw gas waste heat recovery system comprises an ascending pipe evaporator circulation system and a reheating system; the circulating system of the ascending tube evaporator comprises an ascending tube evaporator and a steam drum, wherein a water inlet and a steam outlet of the ascending tube evaporator are respectively communicated with a water outlet and a steam inlet of the steam drum, and the upper part of the steam drum is communicated with a user steam pipe network; the reheating system comprises reheating equipment, wherein the reheating equipment comprises two inlets, one inlet is communicated with the lower part of the steam drum, and the other inlet is communicated with a desalted water pipeline; and the outlet of the reheating equipment is communicated with a user steam pipe network. According to the invention, the low-quality steam of the steam drum is separated out and heated again, and the desalted water is heated to generate part of steam, so that the steam quality and the steam quantity are improved.
Description
Technical Field
The invention relates to a system for recovering waste heat of raw gas of a coke oven.
Background
In the coking process of the coke oven, a great amount of raw coke oven gas escapes from the coking chamber, and is sent to a chemical production device for purification treatment after being cooled and integrated by an ascending pipe, a bridge pipe and a gas collecting pipe of the coke oven; in a coking period, the raw coke oven gas produced by the single-hole coking chamber is about 10000m3The temperature of the raw gas passing through the ascending tube of the coke oven is as high as 650-800 ℃, and a large amount of sensible heat is contained. In order to reduce the temperature of the coke oven crude gas and facilitate subsequent coking process treatment, the traditional process adopts sprayed circulating ammonia water to rapidly cool the high-temperature crude gas, so that the temperature of the crude gas is rapidly reduced to 80-85 ℃. The process flow not only wastes a large amount of sensible heat of the raw gas, but also consumes a large amount of ammonia water, wastes a large amount of water resources and electric power, and increases sewage discharge.
The sensible heat of the coke oven raw gas is huge and is not effectively utilized. The current coking industry actively searches for a new way for cost reduction and efficiency improvement, energy conservation is undoubtedly an important means for reducing cost, along with the high-speed development of industrial production, the energy demand is larger and larger, the energy supply is more and more tense, and various industries have to dive innovation and adopt energy conservation and emission reduction measures as much as possible.
Disclosure of Invention
Aiming at the problems, the invention provides a coke oven crude gas waste heat recovery system for comprehensively recovering waste heat of a coke oven riser.
In order to achieve the purpose, the coke oven crude gas waste heat recovery system comprises an ascending pipe evaporator circulation system for recovering the coke oven crude gas waste heat and a reheating system for reheating low-grade steam;
the circulating system of the ascending tube evaporator comprises an ascending tube evaporator and a steam drum, wherein a water inlet and a steam outlet of the ascending tube evaporator are respectively communicated with a water outlet and a steam inlet of the steam drum, and the upper part of the steam drum is communicated with a user steam pipe network;
the reheating system comprises a reheating device, wherein the reheating device comprises two inlets, one inlet is communicated with the lower part of the steam drum, and the other inlet is communicated with a desalted water pipeline; and the outlet of the reheating equipment is communicated with a user steam pipe network.
Furthermore, the reheating equipment comprises a closed heating box body, a steam inlet communicated with the steam drum is arranged on a top plate of the heating box body, and the steam inlet extends into the heating box body; the lower end of the steam inlet is rotationally communicated with a hollow shaft with a closed lower end and an open upper end, a plurality of hollow blades are uniformly distributed along the circumference of the hollow shaft, and a cavity in the hollow shaft is communicated with a cavity in each hollow blade; a plurality of injection holes are formed in one side of the hollow blade;
the heating box body is further provided with a demineralized water inlet communicated with a demineralized water pipeline, the bottom end of the demineralized water inlet is higher than the highest point of the hollow blade, and the bottom plate orthographic projection of the heating box body is located in the range of the blade rotation track in the bottom plate orthographic projection of the heating box body.
Furthermore, a pipeline for communicating the steam drum with the reheating equipment is also provided with a steam-water separation equipment;
and a medium inlet of the steam-water separation equipment is communicated with the lower part of the steam drum, and a steam outlet and a water outlet of the steam-water separation equipment are respectively communicated with a steam inlet of the reheating equipment and a water inlet of the steam drum.
Furthermore, a steam-water separation device is also arranged on a pipeline for communicating the outlet of the reheating device with a user steam pipe network;
and a medium inlet of the steam-water separation equipment is communicated with an outlet of the reheating equipment, and a steam outlet and a water outlet of the steam-water separation equipment are respectively communicated with the user steam pipe network and a water inlet of the steam drum.
Furthermore, the steam-water separation equipment is a deaerator, and a steam inlet on a deaerating head of the deaerator is communicated with a steam outlet of the steam drum;
and the water outlet of the oxygen remover is communicated with the water replenishing port of the steam drum and the water inlet of the reheating equipment.
Furthermore, a plurality of ascending pipes are arranged on the coke oven carbonization chamber, and ascending pipe heat exchangers arranged on the ascending pipes are connected in parallel and then communicated with the steam drum.
Furthermore, the steam-water separation equipment is a pollution discharge flash tank.
Furthermore, the ascending tube evaporator tube group system comprises at least one ascending tube evaporator, and the ascending tube evaporator comprises an inner tube, an inner sleeve, a heat insulation layer and an outer jacket which are sequentially arranged from inside to outside; the inner side of the inner pipe is a crude gas channel, and a steam-water channel is formed between the inner pipe and the inner sleeve.
Furthermore, the raw coke oven gas system is connected with the coke oven carbonization chamber and the three-way pipe through a riser evaporator pipe group system, and then enters the chemical product recovery system through a bridge pipe and a gas collecting pipe.
Further, the inner tube and the inner sleeve are seamless steel tubes, and a non-stick coating is arranged on the inner wall of the inner tube.
The coke oven raw gas waste heat recovery system ensures the safe operation of the coke oven through the ascending pipe evaporator circulating system and the reheating system, does not influence the production process parameters, effectively recovers the sensible heat of the coke oven raw gas, greatly reduces the circulation amount of ammonia water, and reduces the sewage discharge amount. In the coke oven raw gas waste heat recovery system, high-quality steam directly enters a user steam pipe network, low-quality steam enters a reheating system for reheating treatment, so that the quality of the steam is improved, part of steam can be generated by desalted water added into the reheating system, and the steam with the improved quality in reheating equipment and the steam generated by heating the desalted water are also led to the user steam pipe network, so that the problems of low steam quality and insufficient steam quantity in the existing raw gas waste heat recovery system are solved.
Drawings
FIG. 1 is a schematic diagram of an embodiment 1 of the waste heat recovery system of raw coke oven gas of the coke oven of the invention;
FIG. 2 is a gas flow chart of the embodiment 1 of the waste heat recovery system of raw gas of the coke oven of the invention;
FIG. 3 is a flow chart of a steam-water process system of the embodiment 1 of the waste heat recovery system of the raw gas of the coke oven;
FIG. 4 is a schematic diagram of an optimized structure of a tube-rising evaporator of the coke oven crude gas waste heat recovery system of the invention;
fig. 5 is a view a-a of fig. 1.
Detailed Description
The invention is further described in the following with reference to the drawings.
Example 1
As shown in fig. 1 to 5, the present embodiment provides a system for recovering waste heat of coke oven raw gas, which includes an ascending tube evaporator circulation system for recovering waste heat of coke oven raw gas and a reheating system for reheating low-grade steam;
the circulating system of the ascending tube evaporator comprises an ascending tube evaporator and a steam drum, wherein a water inlet and a steam outlet of the ascending tube evaporator are respectively communicated with a water outlet and a steam inlet of the steam drum, and the upper part of the steam drum is communicated with a user steam pipe network;
the reheating system comprises a reheating device, wherein the reheating device comprises two inlets, one inlet is communicated with the lower part of the steam drum, and the other inlet is communicated with a desalted water pipeline; and the outlet of the reheating equipment is communicated with a user steam pipe network.
The concrete structure is as follows:
the system comprises an ascending tube evaporator tube group system 2 and a reheating system 3; the riser evaporator tube bank system 2 is installed in a raw gas system 4.
The ascending tube evaporator tube group system 2 consists of at least one ascending tube evaporator, and the ascending tube evaporator comprises an inner tube 2.1, an inner sleeve 2.2, a heat preservation layer 2.3 and an outer jacket 2.4 which are sequentially arranged from inside to outside;
the inner side of the inner pipe 2.1 is a raw gas channel 2.5, and a steam-water channel is formed between the inner pipe 2.1 and the inner sleeve 2.2.
The raw gas system is connected with a coke oven carbonization chamber 1 and a three-way pipe through a riser evaporator pipe set system 2, and then enters a chemical product recovery system through a bridge pipe and a gas collecting pipe.
In the coking process of the coke oven, a great amount of raw gas escapes from a coking chamber, high-temperature raw gas at 750 ℃ enters an evaporator tube group system 2 of a rising tube of the coke oven, the temperature is reduced to 500 ℃ after heat exchange, the raw gas enters a bridge tube, the raw gas is cooled to 90 ℃ after being sprayed in the bridge tube, and the raw gas enters a chemical production system for purification treatment after being cooled and collected by a gas collecting tube.
In the reheating system 3, demineralized water is introduced into reheating equipment, the reheating equipment heats the demineralized water, the demineralized water is sent into a steam drum through a steam drum water supply pump and then sent into a steam inlet 2.6 of an ascending tube evaporator through a forced circulation pump, raw coke oven gas and cooling water carry out heat exchange through the ascending tube evaporator, steam drum water absorbs heat of the ascending tube evaporator in a jacket to generate a steam-water mixture, a high-temperature steam-water mixture is sent into the steam drum through a steam-water outlet 2.7 of the ascending tube evaporator, and when the pressure of the steam drum reaches a rated value, saturated steam is generated and sent into a pipe network from the upper part of the steam drum. And the low-grade steam of steam drum lower part gets into the equipment of reheating and gets into the steam pipe network after promoting the quality, in addition, in the equipment of reheating, owing to let in demineralized water, consequently, also can produce steam among the reheating process, and this part steam also can send into the steam pipe network.
According to the coke oven crude gas waste heat recovery system, the safe operation of the coke oven is ensured through the ascending pipe evaporator circulating system and the reheating system, the sensible heat of the coke oven crude gas is effectively recovered while the production process parameters are not influenced, the circulation quantity of ammonia water is greatly reduced, and the sewage discharge quantity is reduced. In addition, in the coke oven raw gas waste heat recovery system of the embodiment, high-quality steam directly enters the user steam pipe network, and low-quality steam enters the reheating system for reheating treatment, so that the quality of the steam is improved, and the desalted water added into the reheating system can also generate partial steam, and the steam with the quality improved in the reheating equipment and the steam generated by heating the desalted water are also led to the user steam pipe network, so that the problems of low steam quality and insufficient steam quantity in the existing raw gas waste heat recovery system are solved.
In this embodiment, the water replenishing of the drum is performed by adding demineralized water into the reheating system for heating and then replenishing the drum, or the demineralized water may be directly added into the drum or heated by other devices and then fed into the drum.
For the selection of the reheating device, an electric heater or a device which heats by adopting a fuel combustion mode can be selected.
Example 2
On the basis of the embodiment, the reheating equipment comprises a closed heating box body, wherein a steam inlet communicated with the steam drum is formed in the top plate of the heating box body, and the steam inlet extends into the heating box body; the lower end of the steam inlet is rotationally communicated with a hollow shaft with a closed lower end and an open upper end, a plurality of hollow blades are uniformly distributed along the circumferential direction of the hollow shaft, and a cavity in the hollow shaft is communicated with a cavity in each hollow blade; a plurality of injection holes are formed in one side of the hollow blade;
the heating box body is further provided with a demineralized water inlet communicated with a demineralized water pipeline, the bottom end of the demineralized water inlet is higher than the highest point of the hollow blade, and the bottom plate orthographic projection of the heating box body is located in the range of the blade rotation track in the bottom plate orthographic projection of the heating box body.
In this embodiment, when steam lets in reheating equipment's steam inlet, because the injection of steam, hollow blade can produce rotatoryly, when demineralized water passes through demineralized water inlet and gets into the box, because the injection of steam and the rotation of blade, can make the demineralized water atomizing of entering, atomizing water heat transfer speed is greater than the water under the liquid state far away, consequently, is favorable to accelerating the speed of heat transfer with the demineralized water atomizing, improves reheating equipment to the rate of heating of demineralized water. Simultaneously, because the contact with steam among the demineralized water atomization process, can make steam rapid mix with the demineralized water, simultaneously, the heat of steam also can transmit for the demineralized water, promotes the temperature of demineralized water, makes the speed of steam production accelerate in the box.
In this embodiment, an electric heating device or a fuel combustion heating device is disposed outside the box body to heat the box body.
Example 3
On the basis of the above embodiment, the demineralized water is sent into a box body 3.2 through a pipeline 3.1, and blades 3.16 are arranged in the box body. The desalted water is pressurized and sent into a thermal deaerator 3.4 through a deaerating water feeding pump 3.3. The deaerated water is sent into a steam pocket 3.6 through a steam pocket water feeding pump 3.5, then enters a forced circulation pump 3.7, is sent into a main water feeding pipeline 3.8, and then enters a plurality of ascending pipe evaporator pipe groups 2 for heat exchange to generate a steam-water mixture. The steam-water mixture flows back to the steam drum 3.6 through a water return pipeline 3.9 for steam-water separation. Saturated steam enters the main steam line 3.10. A hole is formed in the main steam pipeline, a heating steam pipeline 3.11 is installed, and the pressure is reduced by a pressure reducing valve for 3.12, and then the steam enters a thermal deaerator 3.4 to perform thermal deaerating. The water with high salt content in the steam pocket enters a pollution discharge expansion tank 3.13, the generated secondary steam enters a secondary steam pipeline 3.14 and then enters a blade 3.16, and the secondary steam is sprayed into the box body through the blade to carry out steam-water mixed heating, so that the quality of the secondary steam is improved, and new steam is generated. The lowest point of the evaporator of the ascending pipe is provided with a sewage discharge outlet 2.8 which discharges sewage into a sewage discharge pipeline 3.15 to discharge the sewage.
In this embodiment, the blowdown flash tank has blowdown and water separator's effect concurrently, and thermal oxygen-eliminating device then has deoxidization and water separator's effect concurrently.
The sensible heat utilization system comprises a steam-water system, on one hand, secondary steam heat energy generated by continuous blowdown is fully recovered, heat loss is reduced, and heat efficiency is improved; on the other hand, the steam-water system adopts self steam to remove oxygen, which is beneficial to reducing the external energy consumption and the installation cost of external steam pipelines. The steam-water system of the sensible heat utilization system has the characteristics of high heat efficiency and investment conservation.
On the basis of the above embodiments, the inner tube 2.1 and the inner sleeve 2.2 are made of a whole alloy seamless steel tube without a welding seam, so that the situation that water flows into a carbonization chamber during an accident can be avoided; the inner wall of the inner pipe is provided with the non-stick coating, so that the coking and corrosion phenomena of the inner wall of the ascending pipe are avoided.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (6)
1. A coke oven crude gas waste heat recovery system is characterized in that: the system comprises an ascending tube evaporator circulating system for recovering the waste heat of the coke oven crude gas and a reheating system for reheating low-grade steam;
the circulating system of the ascending tube evaporator comprises an ascending tube evaporator and a steam drum, wherein a water inlet and a steam outlet of the ascending tube evaporator are respectively communicated with a water outlet and a steam inlet of the steam drum, and the upper part of the steam drum is communicated with a user steam pipe network;
the reheating system comprises a reheating device, wherein the reheating device comprises two inlets, one inlet is communicated with the lower part of the steam drum, and the other inlet is communicated with a desalted water pipeline; the outlet of the reheating equipment is communicated with a user steam pipe network;
a pipeline for communicating the steam drum with the reheating equipment is also provided with a steam-water separation equipment;
and a medium inlet of the steam-water separation equipment is communicated with the lower part of the steam drum, and a steam outlet and a water outlet of the steam-water separation equipment are respectively communicated with a steam inlet of the reheating equipment and a water inlet of the steam drum.
2. The coke oven raw gas waste heat recovery system of claim 1, characterized in that: the reheating equipment comprises a closed heating box body, a steam inlet communicated with the steam drum is formed in the top plate of the heating box body, and the steam inlet extends into the heating box body; the lower end of the steam inlet is rotationally communicated with a hollow shaft with a closed lower end and an open upper end, a plurality of hollow blades are uniformly distributed along the circumferential direction of the hollow shaft, and a cavity in the hollow shaft is communicated with a cavity in each hollow blade; a plurality of jet holes are formed in one side of the hollow blade;
the heating box body is further provided with a demineralized water inlet communicated with a demineralized water pipeline, the bottom end of the demineralized water inlet is higher than the highest point of the hollow blade, and the bottom plate orthographic projection of the heating box body is located in the range of the blade rotation track in the bottom plate orthographic projection of the heating box body.
3. The coke oven crude gas waste heat recovery system of claim 1, characterized in that: a steam-water separation device is also arranged on a pipeline for communicating the outlet of the reheating device with a user steam pipe network;
and a medium inlet of the steam-water separation device is communicated with an outlet of the reheating device, and a steam outlet and a water outlet of the steam-water separation device are respectively communicated with the user steam pipe network and a water inlet of the steam drum.
4. The coke oven crude gas waste heat recovery system of claim 3, characterized in that: the steam-water separation equipment is a deaerator, and a steam inlet on a deaerator head of the deaerator is communicated with a steam outlet of the steam drum;
and the water outlet of the oxygen removing water device is communicated with the water replenishing port of the steam drum and the water inlet of the reheating equipment.
5. The coke oven raw gas waste heat recovery system of claim 1, characterized in that: and a plurality of ascending pipes are arranged on the coke oven carbonization chamber, and ascending pipe heat exchangers arranged on the ascending pipes are connected in parallel and then communicated with the steam drum.
6. The coke oven raw gas waste heat recovery system of claim 1, characterized in that: the steam-water separation equipment is a sewage flash tank.
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| CN201710197257.4A CN106867547B (en) | 2017-03-29 | 2017-03-29 | Coke oven crude gas waste heat recovery system |
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| CN201710197257.4A CN106867547B (en) | 2017-03-29 | 2017-03-29 | Coke oven crude gas waste heat recovery system |
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Families Citing this family (3)
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| CN107289787A (en) * | 2017-07-07 | 2017-10-24 | 中冶东方工程技术有限公司 | A kind of waste-heat recovery device for heating furnace |
| CN108373925B (en) * | 2018-04-04 | 2024-02-02 | 胡孝晨 | Coke oven raw gas sensible heat recycling device |
| CN109539217A (en) * | 2018-12-19 | 2019-03-29 | 临涣焦化股份有限公司 | A kind of Riser waste heat recovery device for coke oven |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796537A (en) * | 2012-08-31 | 2012-11-28 | 上海宝钢节能技术有限公司 | System and method for recovering superheated steam of waste heat of raw gas of combined coke oven |
| CN206591075U (en) * | 2017-03-29 | 2017-10-27 | 中冶华天工程技术有限公司 | Waste heat of coke oven crude gas recovery system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102796537A (en) * | 2012-08-31 | 2012-11-28 | 上海宝钢节能技术有限公司 | System and method for recovering superheated steam of waste heat of raw gas of combined coke oven |
| CN206591075U (en) * | 2017-03-29 | 2017-10-27 | 中冶华天工程技术有限公司 | Waste heat of coke oven crude gas recovery system |
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Effective date of registration: 20220601 Address after: 243000 Fu Chang Industrial Park, 259 HSI Nan Road, Ma'anshan economic and Technological Development Zone, Anhui Applicant after: HUATIAN ENGINEERING & TECHNOLOGY CORPORATION, MCC Applicant after: HUATIAN NANJING ENGINEERING & TECHNOLOGY CORPORATION, MCC Address before: 243005 Hunan West Road, Ma'anshan, Ma'anshan, Anhui Applicant before: HUATIAN ENGINEERING & TECHNOLOGY CORPORATION, MCC Applicant before: HUATIAN NANJING ENGINEERING & TECHNOLOGY CORPORATION, MCC Applicant before: MCC HUATIAN (ANHUI) ENERGY SAVING ENVIRONMENTAL PROTECTION RESEARCH INSTITUTE Co.,Ltd. |
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