CN210367571U

CN210367571U - Deep recovery system for heat energy of coke oven crude gas

Info

Publication number: CN210367571U
Application number: CN201920583410.1U
Authority: CN
Inventors: 高毅夫; 高劼
Original assignee: Beijing Kaide Hengyuan Technology Development Co ltd
Current assignee: Beijing Kaide Hengyuan Technology Development Co ltd
Priority date: 2019-04-25
Filing date: 2019-04-25
Publication date: 2020-04-21
Anticipated expiration: 2029-04-25

Abstract

The deep recovery system of coke oven crude gas heat energy belongs to the coke oven energy-saving emission-reducing technology, and is characterized in that the cooling mode of spraying ammonia water and the primary cooler in the prior art are cancelled, the bridge pipe is changed into the heat-insulating flue connected with the first-stage modern plate heat exchanger of each carbonization chamber, the heat exchanger is adopted to recover the crude gas heat energy of each carbonization chamber of the coke oven, the crude gas of the coke oven with the temperature of 650-750 ℃ is reduced to 80-85 ℃, and simultaneously hot water resources with the temperature of 90 ℃ are obtained, and further, the crude gas of the coke oven with the temperature of 80-85 ℃ at the outlet of the gas collecting pipe is reduced to 25-35 ℃ by adopting the second-stage modern plate heat exchanger, and simultaneously hot water resources with the temperature of 90 ℃ are obtained Saving investment and operation cost, and can be widely used for newly-built, expanded or modified coke oven crude gas heat energy recovery systems.

Description

Deep recovery system for heat energy of coke oven crude gas

Technical Field

The utility model belongs to the coke oven energy-saving and emission-reducing technology.

The utility model does not relate to the manufacturing technology of various plate heat exchangers, the process and equipment manufacturing technology of various coke oven gas refining, the utilization technology of coke oven crude gas heat energy and the concrete technical solution thereof.

Background

High-temperature flue gas (crude gas) at 650-750 ℃ generated by each carbonization chamber in the coking process of the coke oven is conveyed to a gas collecting pipe through an ascending pipe and a bridge pipe, and finally refined gas is conveyed into a coke oven gas cabinet through a primary cooler, a blower, a gas refining facility and the like. Wherein the crude gas is cooled by spraying ammonia water at the bridge pipe, so that the temperature of the crude gas is reduced to 80-85 ℃, and then the crude gas is cooled to 25-35 ℃ by a primary cooler. The heat energy of the flue gas at about 625-725 ℃ in the process is lost; in the modern technology, various attempts for recovering the heat energy of the crude gas by arranging a vaporization cooling flue (boiler) at an ascending pipe and the like are also made, but the problems of low heat energy recovery efficiency, limited temperature range of recovered heat energy, complex heat energy recovery equipment, high equipment cost, graphite due to tar and the like exist, and the practical value is lacked.

In recent years, the domestic air pollution condition is serious, the haze weather is frequent, and the country is accelerating to implement environmental protection measures, on one hand, the emission of pollutants is controlled, and on the other hand, the energy-saving emission reduction measures are taken to reduce the carbon emission. If an efficient deep heat recovery technology (process) for coke oven crude gas can be developed, the implementation and development of national energy conservation and emission reduction and macroscopic decision of circular economy can be well promoted.

The plate heat exchanger has the advantages of easy manufacture, safety, reliability, high heat exchange efficiency, light weight, low price, simple maintenance, convenient use and the like. With the development of heat exchange technology, the emergence of modern high-capacity and high-temperature-resistant heat exchangers makes efficient and cheap heat energy recovery possible, which cannot be luxurious originally, and provides a practical technical platform for heat energy recovery. Unfortunately, no published literature or publications on the deep recovery of coke oven raw gas heat energy, i.e. the use of plate heat exchanger heat energy recovery in this field, have been found to date.

In conclusion, the prior art has the problems of large heat energy loss, low recovery efficiency and the like, so that the energy-saving and emission-reducing potential in the field of coke oven crude gas heat energy recovery exists, and the research and development of an innovative energy-saving and emission-reducing technology are urgently needed.

Publications, documents or literature disclosing published deep recovery systems for the thermal energy of coke oven raw gas have not been found to date.

Disclosure of Invention

The utility model discloses according to the characteristics of coke oven crude gas, the gas/water heat exchange method of coke oven crude gas heat energy is researched and developed, carries out the degree of depth recovery to coke oven crude gas heat energy, and the purpose is to overcome the heat energy loss problem that prior art exists to furthest retrieves coke oven crude gas's heat energy, obtains energy saving and emission reduction effect as good as possible.

The key point of the utility model is that application energy saving and emission reduction, green circular economy, industry and city are melted altogether, sustainable development's new theory, it starts from coke oven crude gas heat energy degree of depth recovery, cancel prior art's cooling method that sprays the aqueous ammonia and cancel the primary cooler, aqueous ammonia circulation cooling system and tar/aqueous ammonia piece-rate system have been saved, carry out heat preservation treatment with prior art's tedge, change the bridge pipe into the heat preservation flue of connecting each carbonization room first order modern plate heat exchanger, adopt first order modern plate heat exchanger to retrieve each carbonization room crude gas heat energy of coke oven, reduce the coke oven crude gas of temperature about 650 ~ 750 ℃ into 80 ~ 85 ℃, obtain the hot water resource of temperature about 90 ℃ simultaneously, this hot water resource gets into public hot water pipe network and storage system, supply with the use of hot water user, crude gas entering collector after the cooling, and then adopt second level modern plate heat exchanger to be about 80 ~ 85 ℃ with collector export temperature about with gas The temperature of the coal gas is reduced to 25-35 ℃, hot water resources with the temperature of about 90 ℃ are obtained at the same time, the hot water resources enter a public hot water pipe network and a storage system and are supplied to hot water users for use, and the crude coal gas after being cooled again is sent to a coal gas refining facility through a mechanical tar catcher, an electric tar catcher, a coal gas blower inlet valve and a coal gas blower and is finally sent to a coke oven gas cabinet.

Drawings

FIG. 1 is a process flow diagram of a deep recovery system of coke oven crude gas heat energy, in which FIG. 1 is a coke oven, FIG. 2 is a coke oven No. 1 carbonization chamber riser, FIG. 3 is a No. 1 heat preservation pipe, FIG. 4 is a coke oven No. 1 carbonization chamber heat exchange facility, FIG. 5 is a No. 1 tar exhaust facility, FIG. 6 is an outlet valve of a coke oven No. 1 carbonization chamber heat exchange facility, FIG. 7 is a gas collecting pipe, FIG. 8 is a second stage heat exchange facility, FIG. 9 is an N +1 tar exhaust facility, FIG. 10 is a mechanical tar catcher, FIG. 11 is an electrical tar catcher, FIG. 12 is a gas blower inlet valve, FIG. 13 is a gas blower, FIG. 14 is a coke oven gas refining and chemical by-product recovery facility, FIG. 15 is a coke oven gas cabinet, FIG. 16 is a coke oven No. N carbonization chamber riser, FIG. 17 is a No. N heat preservation pipe, FIG. 18 is a coke oven No..

Detailed Description

For a long time, in the aspect of coke oven crude gas heat energy recycling, because systematic and deep research is not carried out, particularly, new concepts of energy conservation and emission reduction, green circular economy, industrial and urban co-integration and sustainable development are not applied to think of the huge value of heat energy recycling, the research in the aspect is basically in a stagnation state. The deficiency of the heat energy recovery technology and the deficiency of the heat energy utilization technology jointly form the technical bottleneck of the heat energy recovery and utilization of the coke oven crude gas. To break through this technical bottleneck, innovative thinking is needed. The heat energy recovery and utilization are mutually restricted and mutually promoted, and if the heat energy recovery and utilization have no utilization value, the power of the heat energy recovery is not researched; the research on heat energy recovery has great driving force when the heat energy recovery has a utilization value, particularly a utilization value with a wide application prospect.

For recycling the heat energy of the coke oven crude gas, the simplest and effective method is to convert the heat energy into hot water energy for recycling, and the facilities required for converting the crude gas heat energy into the hot water energy are simpler and safer than the facilities required for recycling steam, the equipment is easier to manufacture, and the heat energy conversion efficiency is higher; the hot water energy source has wider utilization range, can be used for industry, civil, municipal facilities, agriculture and the like, can be used for civil winter heating, low-temperature season heating, bathing and the like to improve the living quality of people, can also be used for municipal facilities such as hospitals, hotels and the like, can be used for agricultural greenhouses and the like, and can form good social environment with energy conservation and emission reduction, green recycling economy, city and industry integration and sustainable development.

By applying the new concepts of energy conservation and emission reduction, green circular economy, industrial and urban co-integration and sustainable development, the deep recovery system of the heat energy of the coke oven crude gas shown in the attached figure 1 is researched and developed, and is characterized by comprising the following components: a coke oven (1), a coke oven No. 1 carbonization chamber riser (2), a No. 1 heat preservation pipeline (3), a coke oven No. 1 carbonization chamber heat exchange facility (4), a No. 1 tar discharge facility (5), a coke oven No. 1 carbonization chamber heat exchange facility outlet valve (6), a gas collecting pipe (7), a second-stage heat exchange facility (8), an N +1 tar discharge facility (9) and a mechanical tar catcher (10), an electric tar catcher (11), a gas blower inlet valve (12), a gas blower (13), a coke oven gas refining and chemical byproduct recycling facility (14), a coke oven gas cabinet (15), a coke oven N-number carbonization chamber ascending pipe (16), an N-number heat insulation pipeline (17), a coke oven N-number carbonization chamber heat exchange facility (18), an N-number tar discharging facility (19) and a coke oven N-number carbonization chamber heat exchange facility outlet valve (20); the coke oven (1) is a process device and is respectively connected with a coke oven No. 1 carbonization chamber ascending pipe (2) and a coke oven No. N carbonization chamber ascending pipe (16); the ascending pipe (2) of the carbonization chamber No. 1 of the coke oven is a device for collecting crude gas of the carbonization chamber No. 1 of the coke oven; the No. 1 heat-insulating pipeline (3) is pipeline equipment for connecting a riser of a No. 1 carbonization chamber of the coke oven with a heat exchange facility of a No. 1 carbonization chamber of the coke oven, and is a heat-insulating pipeline; the heat exchange facility (4) of the No. 1 coking chamber of the coke oven is a modern high-temperature-resistant plate heat exchanger, is designed in an explosion-proof manner, is a first-stage modern plate heat exchanger, has an installation gradient of 10 degrees, and is respectively connected with the No. 1 tar discharge facility (5) and the outlet valve (6) of the No. 1 coking chamber of the coke oven, and is used for reducing the temperature of crude gas at the outlet of the heat exchanger to 80-85 ℃ in a gas/water heat exchange manner during the coking process of the No. 1 coking chamber of the coke oven, and simultaneously recovering hot water resources subjected to heat exchange, sending the hot water resources into a public hot water pipe network and a storage system for hot water users to use; the No. 1 tar discharge facility (5) is a tar discharge facility consisting of a valve and a pump, and is used for discharging tar precipitated in the heat exchanger at all times or at regular time and sending the tar to a tar collecting pipe network; the outlet valve (6) of the heat exchange facility of the No. 1 coking chamber of the coke oven is an electric, hydraulic or pneumatic regulating valve, is connected with a gas collecting pipe (7) and is used for regulating the flow and the pressure of the crude gas of the No. 1 coking chamber according to the change of the coking working condition of the coke oven; the gas collecting pipe (7) is a process pipeline device, is connected with the second-stage heat exchange facility (8) and is used for collecting the crude gas of each carbonization chamber; the second-stage heat exchange facility (8) is a modern low-temperature plate type heat exchanger, is designed to be explosion-proof, is a second-stage modern plate type heat exchanger, has an installation gradient of 10 degrees, is respectively connected with the No. N +1 tar discharging facility (9) and the mechanical tar catcher (10), and has the function of reducing the temperature of the crude gas at the outlet of the gas collecting pipe to 25-35 ℃ in a gas/water heat exchange mode, and simultaneously recovers hot water resources of heat exchange, sends the hot water resources into a public hot water pipe network and a storage system, and supplies the hot water resources for hot water users; the No. N +1 tar discharge facility (9) is a tar discharge facility consisting of a valve and a pump, and is used for discharging tar precipitated in the heat exchanger at all times or at regular time and sending the tar to a tar collecting pipe network; the mechanical tar catcher (10) is process equipment and is connected with the electric tar catcher (11); the electric tar catcher (11) is process equipment and is connected with an inlet valve (12) of a coal gas blower; the inlet valve (12) of the gas blower is an electric, hydraulic or pneumatic regulating valve, is connected with the gas blower (13) and is used for regulating the flow and pressure of crude gas of a pipe network according to the change of the coking working condition of the coke oven; the coal gas blower (13) is an axial flow fan or a centrifugal fan, operates in a variable speed mode, and is connected with a coke oven gas refining and chemical byproduct recovery facility (14); the coke oven gas refining and chemical byproduct recycling facility (14) is a process facility and is connected with a coke oven gas cabinet (15) and is used for refining coke oven crude gas and recycling chemical byproducts; the coke oven gas cabinet (15) is a process device; the ascending pipe (16) of the carbonization chamber No. N of the coke oven is equipment for collecting the smoke of the carbonization chamber No. N of the coke oven; the N-shaped heat insulation pipeline (17) is pipeline equipment for connecting an ascending pipe of the N-shaped carbonization chamber of the coke oven with a heat exchange facility of the N-shaped carbonization chamber of the coke oven, and is a heat insulation pipeline; the heat exchange facility (18) of the No. N carbonization chamber of the coke oven is a modern high-temperature-resistant plate heat exchanger, is designed in an explosion-proof manner, is a first-stage modern plate heat exchanger, has an installation gradient of 10 degrees, and is respectively connected with the No. N tar discharge facility (19) and the outlet valve (20) of the No. N carbonization chamber heat exchange facility of the coke oven, and is used for reducing the temperature of the flue gas at the outlet of the heat exchanger to about 80-85 ℃ in a gas/water heat exchange manner during the coking process of the No. N carbonization chamber of the coke oven, and simultaneously recovering hot water resources subjected to heat exchange, sending the hot water resources into a public hot water pipe network and a storage system for hot water users to use; the No. N tar discharge facility (19) is a tar discharge facility consisting of a valve and a pump, and is used for discharging tar precipitated in the heat exchanger at all times or at regular time and sending the tar to a tar collecting pipe network; the outlet valve (20) of the heat exchange facility of the No. N coking chamber of the coke oven is an electric, hydraulic or pneumatic regulating valve, is connected with the gas collecting pipe (7) and is used for regulating the flow and the pressure of the crude gas of the No. N coking chamber according to the change of the coking working condition of the coke oven.

The heat energy recovery equipment cools crude gas with the temperature of 650-750 ℃ to crude gas with the temperature of about 25-35 ℃ through a modern plate heat exchanger, and simultaneously converts the temperature-reduced heat energy of the crude gas into hot water with the temperature of 90 ℃, and the hot water is used for industrial, civil or agricultural purposes and the like. The energy saving of the heat exchange process is considerable, and the gas amount of the crude coal is 90000m³The annual heat energy recovery benefit is calculated by taking the example of the temperature of the raw gas at the inlet of the heat exchanger as 700 ℃, the temperature of the flue gas at the outlet as 35 ℃, the temperature of the cooling water at the inlet of the heat exchanger as 20 ℃, the temperature at the outlet as 90 ℃, the annual operating rate of the coke oven as 320 days and the electricity charge as 0.5 yuan/kWh: the standard coal is saved by 21259.92 tons, the reduced carbon emission in reduced years is 14456.75 tons, the electric quantity in reduced years is 53149812kWh, and the electricity-saving cost in reduced years is 2657.49 ten thousand yuan. Hundreds of coke ovens exist in China, and if a deep recovery technology of heat energy of coke oven crude gas is adopted, billions of yuan of benefit can be generated every year, and millions of tons of carbon emission can be reduced every year.

Compared with the prior art, the deep recovery system of the coke oven crude gas heat energy recovers the coke oven crude gas heat energy to the maximum extent, cancels the cooling mode of spraying ammonia water and primary cooler, omits an ammonia water circulating cooling system and a tar/ammonia water separation system, obtains economic benefits of greatly saving energy and greatly reducing equipment cost and maintenance cost, has prominent substantive characteristics and remarkable progress, and has the beneficial characteristics that:

(a) the novel concepts of energy conservation and emission reduction, green circular economy, industrial and urban co-integration and sustainable development are firstly applied to think of the huge value of the heat energy recovery of the coke oven crude gas, the cooling mode of spraying ammonia water and the primary cooler in the prior art are firstly eliminated, the bridge pipe in the prior art is changed into the heat-preservation flue connected with the modern plate heat exchanger, the novel process of recovering the heat energy of the coke oven crude gas by adopting the multistage modern plate heat exchanger is adopted, and a novel approach is opened up for the heat energy recovery of the coke oven crude gas;

(b) the deep recovery of the heat energy of the coke oven crude gas is realized, the heat energy of the crude gas at 625-725 ℃ is recovered more than that of the prior art, and the heat energy of the coke oven crude gas is recovered to the maximum extent basically;

(c) the process flow is simple, the heat energy recovery equipment is simple and easy to manufacture;

(d) the equipment has low operation cost and convenient maintenance;

(e) the investment of engineering projects is low, and the occupied area is small;

(f) the method is very suitable for carrying out energy-saving emission-reduction transformation on the existing coke oven crude gas system, is easy to implement, and has good social and economic benefits;

(g) the new process provides a more convenient way for independent pressure control of each carbonization chamber, and is simpler, more economical, more practical and more competitive than the PROven system of the most advanced technology in the world;

the deep recovery system of the heat energy of the coke oven crude gas can be widely applied to newly built, expanded or modified coke oven crude gas heat energy recovery systems, is not limited to the coke oven crude gas heat energy recovery system, and is also suitable for flue gas heat energy recovery systems of other kilns. Therefore, although the present invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that changes may be made in the above embodiments or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The deep recovery system of coke oven crude gas heat energy is characterized by comprising: a coke oven (1), a coke oven No. 1 carbonization chamber riser (2), a No. 1 heat preservation pipeline (3), a coke oven No. 1 carbonization chamber heat exchange facility (4), a No. 1 tar discharge facility (5), a coke oven No. 1 carbonization chamber heat exchange facility outlet valve (6), a gas collecting pipe (7), a second-stage heat exchange facility (8), an N +1 tar discharge facility (9) and a mechanical tar catcher (10), an electric tar catcher (11), a gas blower inlet valve (12), a gas blower (13), a coke oven gas refining and chemical byproduct recycling facility (14), a coke oven gas cabinet (15), a coke oven N-number carbonization chamber ascending pipe (16), an N-number heat insulation pipeline (17), a coke oven N-number carbonization chamber heat exchange facility (18), an N-number tar discharging facility (19) and a coke oven N-number carbonization chamber heat exchange facility outlet valve (20); the coke oven (1) is a process device and is respectively connected with a coke oven No. 1 carbonization chamber ascending pipe (2) and a coke oven No. N carbonization chamber ascending pipe (16); the ascending pipe (2) of the carbonization chamber No. 1 of the coke oven is a device for collecting crude gas of the carbonization chamber No. 1 of the coke oven; the No. 1 heat-insulating pipeline (3) is pipeline equipment for connecting a riser of a No. 1 carbonization chamber of the coke oven with a heat exchange facility of a No. 1 carbonization chamber of the coke oven, and is a heat-insulating pipeline; the heat exchange facility (4) of the No. 1 coking chamber of the coke oven is a modern high-temperature-resistant plate heat exchanger, is designed in an explosion-proof manner, is a first-stage modern plate heat exchanger, has an installation gradient of 10 degrees, and is respectively connected with the No. 1 tar discharge facility (5) and the outlet valve (6) of the No. 1 coking chamber of the coke oven, and is used for reducing the temperature of crude gas at the outlet of the No. 1 coking chamber of the coke oven to between 650 and 750 ℃ in a gas/water heat exchange manner, reducing the temperature of the crude gas at the outlet of the heat exchanger to between 80 and 85 ℃, simultaneously recovering hot water resources subjected to heat exchange, sending the hot water resources into a public hot water pipe network and a storage system, and supplying; the No. 1 tar discharge facility (5) is a tar discharge facility consisting of a valve and a pump, and is used for discharging tar precipitated in the heat exchanger at all times or at regular time and sending the tar to a tar collecting pipe network; the outlet valve (6) of the heat exchange facility of the No. 1 coking chamber of the coke oven is an electric, hydraulic or pneumatic regulating valve, is connected with a gas collecting pipe (7) and is used for regulating the flow and the pressure of the crude gas of the No. 1 coking chamber according to the change of the coking working condition of the coke oven; the gas collecting pipe (7) is a process pipeline device, is connected with the second-stage heat exchange facility (8) and is used for collecting the crude gas of each carbonization chamber; the second-stage heat exchange facility (8) is a modern low-temperature plate type heat exchanger, is designed to be explosion-proof, is a second-stage modern plate type heat exchanger, has an installation gradient of 10 degrees, is respectively connected with the No. N +1 tar discharging facility (9) and the mechanical tar catcher (10), and has the function of reducing the temperature of the crude gas at the outlet of the gas collecting pipe to 25-35 ℃ in a gas/water heat exchange mode, and simultaneously recovers hot water resources of heat exchange, sends the hot water resources into a public hot water pipe network and a storage system, and supplies the hot water resources for hot water users; the No. N +1 tar discharge facility (9) is a tar discharge facility consisting of a valve and a pump, and is used for discharging tar precipitated in the heat exchanger at all times or at regular time and sending the tar to a tar collecting pipe network; the mechanical tar catcher (10) is process equipment and is connected with the electric tar catcher (11); the electric tar catcher (11) is process equipment and is connected with an inlet valve (12) of a coal gas blower; the inlet valve (12) of the gas blower is an electric, hydraulic or pneumatic regulating valve, is connected with the gas blower (13) and is used for regulating the flow and pressure of crude gas of a pipe network according to the change of the coking working condition of the coke oven; the coal gas blower (13) is an axial flow fan or a centrifugal fan, operates in a variable speed mode, and is connected with a coke oven gas refining and chemical byproduct recovery facility (14); the coke oven gas refining and chemical byproduct recycling facility (14) is a process facility and is connected with a coke oven gas cabinet (15) and is used for refining coke oven crude gas and recycling chemical byproducts; the coke oven gas cabinet (15) is a process device; the ascending pipe (16) of the carbonization chamber No. N of the coke oven is equipment for collecting the smoke of the carbonization chamber No. N of the coke oven; the N-shaped heat insulation pipeline (17) is pipeline equipment for connecting an ascending pipe of the N-shaped carbonization chamber of the coke oven with a heat exchange facility of the N-shaped carbonization chamber of the coke oven, and is a heat insulation pipeline; the heat exchange facility (18) of the No. N carbonization chamber of the coke oven is a modern high-temperature-resistant plate heat exchanger, is designed in an explosion-proof manner, is a first-stage modern plate heat exchanger, has an installation gradient of 10 degrees, and is respectively connected with the No. N tar discharge facility (19) and the outlet valve (20) of the No. N carbonization chamber heat exchange facility of the coke oven, and is used for reducing the temperature of the flue gas at the outlet of the heat exchanger to about 80-85 ℃ in a gas/water heat exchange manner during the coking process of the No. N carbonization chamber of the coke oven, and simultaneously recovering hot water resources subjected to heat exchange, sending the hot water resources into a public hot water pipe network and a storage system for hot water users to use; the No. N tar discharge facility (19) is a tar discharge facility consisting of a valve and a pump, and is used for discharging tar precipitated in the heat exchanger at all times or at regular time and sending the tar to a tar collecting pipe network; the outlet valve (20) of the heat exchange facility of the No. N coking chamber of the coke oven is an electric, hydraulic or pneumatic regulating valve, is connected with the gas collecting pipe (7) and is used for regulating the flow and the pressure of the crude gas of the No. N coking chamber according to the change of the coking working condition of the coke oven.

2. The system according to claim 1, characterized in that the coking oven No. 1 coking chamber heat exchange means (4) and the coking oven No. N coking chamber heat exchange means (18) are not limited to the use of modern high temperature plate heat exchangers, but also include the use of high temperature heat exchangers meeting the specifications.

3. System according to claim 1, characterized in that the second stage heat exchange means (8) are not limited to the use of modern cryogenic plate heat exchangers, but also to the use of cryogenic heat exchangers complying with the specifications.

4. System according to claim 1, characterised in that the installation gradient of the first stage modern plate heat exchanger and the second stage modern plate heat exchanger is not limited to 10 ° but is also applicable to suitable gradients.

5. The system according to claim 1, wherein the temperature of the raw gas at the outlet of the modern plate heat exchanger of the first stage and the temperature of the raw gas at the inlet of the modern plate heat exchanger of the second stage are not limited to 80-85 ℃, and the system is suitable for suitable temperatures.

6. The system of claim 1, wherein the system is widely applied to newly built, expanded or modified coke oven crude gas heat energy recovery systems, and the system is not limited to the coke oven crude gas heat energy recovery system, and is also suitable for being applied to flue gas heat energy recovery systems of kilns in the industrial and mining fields.