CN111380367A - A high-efficiency and intrinsically safe coke oven high-temperature waste gas heat recovery process and equipment - Google Patents

Abstract

The invention provides a high-efficiency and intrinsically safe coke oven high-temperature raw gas heat recovery process and equipment, wherein the coke oven high-temperature raw gas heat recovery equipment comprises: the system comprises a riser, an evaporation tank and a hot water intermediate tank in a double-sleeve structural form, wherein a heat superconducting element is arranged between an inner sleeve and an outer sleeve of the riser, and a non-condensable gas exhaust stop valve and a rupture disk safety device are arranged on the heat superconducting element; a soft water passage is arranged between the outer sleeve and the heat superconducting element; a raw gas outlet of the ascending pipe is communicated with a gas inlet of the circulating ammonia water spraying device; the soft water outlet of the ascending pipe is communicated with the inlet of the evaporating pot, the steam outlet of the evaporating pot is communicated with the steam pipe network, the hot water outlet of the evaporating pot is communicated with the inlet of the hot water intermediate tank, and the outlet of the hot water intermediate tank is communicated with the soft water inlet of the ascending pipe through the hot water pump. The invention conducts heat by an inorganic heat superconducting technology, and realizes the high-efficiency and safe recovery of the heat of the high-temperature raw coke oven gas.

Description

A high-efficiency and intrinsically safe coke oven high-temperature waste gas heat recovery process and equipment

technical field

The invention relates to a technology for comprehensive utilization of coking energy, in particular to an efficient and intrinsically safe coke oven high-temperature waste gas heat recovery process and equipment.

Background technique

Coking production is a production process in which the coking coal is placed in the coke oven carbonization chamber and indirectly heated to make the coal heated to dry distillation and coking. During the dry distillation and coking process of the coal, a large amount of high-temperature waste gas and water vapor are generated, and each ton of coke produces about 400 m ^3. Waste gas and 150kg water vapor. The high temperature waste gas and water vapor discharged from the rising pipe of the coke oven carbonization chamber is about 650-750 °C. The waste gas and water vapor contain impurities such as tar, ammonia, hydrogen sulfide and dust. The waste gas produced in each carbonization chamber is sprayed and cooled by circulating ammonia water to about 82°C and enters the gas collecting pipe, and the waste gas in the gas collecting pipe is sent to the gas purification workshop for purification treatment. The adiabatic cooling method of spraying high-temperature waste gas with circulating ammonia water has the characteristics of simple operation; however, the sensible heat of high-temperature waste gas and water vapor is not reasonably recovered and utilized in the cooling process. Coke oven coking production is a continuous production process. The coke oven riser is an important equipment for exporting coke oven gas. The high-temperature waste gas in the production is corrosive to the riser pipe wall. In the special environment of continuous production of coke ovens, the corrosion damage and service life of the riser cannot be regularly stopped for inspection and evaluation; in production, there are often sudden perforation accidents of the riser due to high temperature corrosion, resulting in high-temperature waste gas strings in the riser. leak into the atmosphere. How to efficiently and safely utilize the heat of high-temperature waste gas under the special conditions of coke oven coking production is a long-standing problem in the coking industry. Many production enterprises have carried out a lot of exploration in this technical field, and have also achieved many application results and experiences.

At present, there are mainly two ways to recover and utilize the waste heat of high-temperature waste gas. First, a jacket-type riser is used to indirectly exchange heat between water and high-temperature waste gas, and the heat of waste gas is recovered to generate steam. 2. Install the coil in the jacketed riser, pass the heat transfer oil or molten salt through the coil to absorb the heat of the high-temperature waste gas, and then exchange heat with the water to generate steam to recover the heat.

The patent "A Method for Recovering and Utilizing Waste Heat from Waste Gas" (CN104419431A) adopts a water-cooled jacket-type method of heat exchange between waste gas and water to generate steam; the key technical core is to select the inner sleeve material with better corrosion resistance Extend the life of the riser. Due to the long-term and continuous production process of the coke oven, there is a change in the corrosion of the inner sleeve of the riser, and it is impossible to regularly stop production inspection and pre-judgment. The soft water in the cylinder flows into the carbonization chamber from the perforation of the pipe wall, causing serious damage to the coke oven wall; therefore, after a period of production and use of this type of riser pipe, there is a potential safety hazard caused by the corrosion of the pipe wall. Lack of intrinsically safe features in terms of safety. The patent "the waste heat recovery of waste gas and the replacement of heat transfer oil with integrated process method and proprietary equipment" (CN102519285A) adopts the method of heat transfer between heat transfer oil and waste gas. There are problems of low heat exchange efficiency, complex heat exchange system and leakage of heat transfer oil on the top of the coke oven causing combustion. In the 1990s, the Nippon Steel Coking Plant introduced the heat transfer oil recovery system of high-temperature waste gas waste heat from Nippon Steel. Due to the above problems in production, it was stopped after a short period of production and application. If molten salt is used instead of heat transfer oil for heat exchange, there is a problem of cooling and solidification of molten salt in an accident state.

Therefore, the core problem of the application of the high-temperature waste gas cooling system is that the waste gas cooling system can not only efficiently recover heat, but also must have the characteristics of intrinsic safety in terms of equipment safety under the continuous production environment of coke ovens. In the long-term production, in the event of an accidental accident of corrosion and perforation of the rising pipe wall, the coke oven related equipment will not be damaged, and the coke oven production is always in a safe production state.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a high-efficiency, intrinsically safe coke oven high-temperature waste gas heat recovery equipment, which uses inorganic thermal superconducting technology to heat Conduction to achieve efficient and safe recovery of high-temperature waste gas heat.

In order to achieve the above purpose, the technical scheme adopted in the present invention is: a high-efficiency, intrinsically safe coke oven high-temperature waste gas heat recovery equipment, including a double-sleeve structure riser, an evaporation tank and a hot water intermediate tank, the riser A thermal superconducting element is arranged between the inner sleeve and the outer sleeve, and the thermal superconducting element is provided with a non-condensable gas exhaust stop valve and a bursting disc safety device; the bottom and top of the inner sleeve are respectively provided with The high-temperature waste gas inlet and the waste gas outlet communicated with the interior of the inner sleeve, the outer sleeve and the thermal superconducting element are a soft water passage, and the bottom and top of the outer sleeve are respectively provided with a soft water inlet and a soft water passage communicating with the soft water passage. Soft water outlet;

The raw gas inlet of the riser is communicated with the high-temperature raw gas outlet of the coke oven carbonization chamber, the raw gas outlet of the riser is communicated with the gas inlet of the circulating ammonia water spray device; the soft water outlet of the riser is communicated with the inlet of the evaporation tank, so The steam outlet of the evaporation tank is communicated with the steam pipe network, the hot water outlet of the evaporation tank is communicated with the inlet of the hot water intermediate tank, and the hot water intermediate tank outlet is communicated with the soft water inlet of the riser through the hot water pump.

Further, between the inner sleeve and the outer sleeve of the rising pipe, a plurality of sections of thermal superconducting elements are arranged along the height direction;

The multi-stage thermal superconducting elements are not connected, and each section of the thermal superconducting element is provided with a non-condensable gas exhaust stop valve and a bursting disc safety device;

Or, the multi-stage thermal superconducting elements are connected, and the connected thermal superconducting elements are provided with a total non-condensable gas release valve and a total bursting disc safety device.

Further, the height of the heated end of each section of the thermal superconducting element is 300-800 mm.

Further, the non-condensable gas exhaust shut-off valve regularly discharges the non-condensable gas generated in the thermal superconducting element to maintain the heat conduction efficiency of the thermal superconducting element. The bursting disc safety device is a pressure protection device for the thermal superconducting element. When the internal pressure of the thermal superconducting element exceeds the design pressure, the bursting disc safety device is destroyed, making the thermal superconducting element communicate with the atmosphere. Each thermal superconducting element can also be communicated with each other, and the connected thermal superconducting element is provided with a total non-condensable gas exhaust stop valve and a bursting disc safety device, reducing the number of installations of the non-condensable gas exhaust stop valve and the bursting disc safety device.

Further, the thermal superconducting working medium in the thermal superconducting element is prepared by using various inorganic or organic materials and compounds.

Further, the inner wall of the inner sleeve is provided with a refractory lining.

Another object of the present invention also discloses a high-efficiency, intrinsically safe coke oven high-temperature waste gas heat recovery process, comprising the following steps:

The high-temperature waste gas flows from bottom to top in the inner sleeve to exchange heat with the thermal superconducting element, and the waste gas obtained by heat exchange and cooling is discharged from the waste gas outlet to the circulating ammonia water spray device;

The soft water is fed into the soft water passage between the outer sleeve and the thermal superconducting element from the soft water inlet of the rising pipe. After the soft water and the thermal superconducting element are heated and heated, the soft water flows out from the soft water outlet, and flows into the evaporation tank through the hot water main pipe; The steam is sent to the steam pipe network, and the hot water of the evaporation tank flows from the outlet to the hot water intermediate tank; the hot water in the hot water intermediate tank is sent to the soft water inlet of the rising pipe again by the hot water pump to be circulated and heated.

Further, the temperature of the high-temperature waste gas is 650-750°C, and the temperature of the waste gas obtained by cooling is 400-450°C, so as to prevent the tar in the waste gas from sticking to the inner cylinder wall.

Further, the water inlet temperature of the evaporation tank is 180-200° C., and the operating pressure is 1.0-1.5 MPa.

Further, the hot water temperature of the hot water intermediate tank is 160-180° C., and the operating pressure is 0.6-1.0 MPa.

The present invention is a high-efficiency and intrinsically safe coke oven high-temperature waste gas heat recovery process and equipment, relates to the field of comprehensive utilization of coking energy, is a novel coke oven high-temperature waste gas heat recovery technology, and has the following advantages compared with the prior art:

1) The high-efficiency and intrinsically safe coke oven high-temperature waste gas heat recovery equipment of the present invention adopts a double-sleeve structure riser, and a thermal superconducting element is arranged between the inner sleeve and the outer sleeve of the double-sleeve riser, along the riser. A multi-stage arrangement of thermal superconducting elements is highly adopted. When the high-temperature waste gas passes through the riser, the thermal superconducting element absorbs the heat of the high-temperature waste gas, and quickly conducts the heat to the soft water, realizing the heat exchange between the high-temperature waste gas and the soft water through the thermal superconducting element. The invention adopts the superconductivity characteristic of the thermal superconducting element, conducts the heat of the high-temperature waste gas to the soft water, isolates the heat exchange contact between the soft water and the high-temperature waste gas, and prevents the soft water from flowing into the carbonization chamber when the inner sleeve is suddenly corroded and perforated. possibility. It realizes that the cooling system and equipment of high temperature raw gas in the riser have the characteristics of intrinsic safety.

2) The arrangement of the thermal superconducting elements of the double-sleeve riser pipe of the present invention may adopt a multi-stage arrangement. When one of the segments fails, the other segments can still continue to work.

3) The thermal superconducting element of the present invention is provided with a non-condensable gas exhaust stop valve, which regularly discharges the non-condensable gas generated in the thermal superconducting element and maintains the thermal conductivity of the thermal superconducting element. The bursting disc safety device is a pressure protection device for the thermal superconducting element. When the internal pressure of the thermal superconducting element exceeds the design pressure, the bursting disc safety device is destroyed, making the thermal superconducting element communicate with the atmosphere. Each thermal superconducting element can also be communicated with each other, and the connected thermal superconducting element is provided with a total non-condensable gas exhaust stop valve and a bursting disc safety device, reducing the number of installations of the non-condensable gas exhaust stop valve and the bursting disc safety device.

4) The high-efficiency and intrinsically safe coke oven high-temperature waste gas heat recovery process of the present invention cools the high-temperature waste gas from 650-750°C to about 400°C, reducing the cooling load of the gas primary cooler by 25-30%; it can save circulating cooling Water 5t/t coke, and steam 120kg/t coke.

5) In the present invention, in order to prevent the tar in the waste gas from sticking to the inner cylinder wall, the temperature of the waste gas at the outlet of the rising pipe is controlled to be 400-450°C.

6) In the present invention, in order to ensure the thermal stability of the thermal superconducting medium, a refractory lining is arranged on the inner wall of the inner sleeve. The arrangement of the refractory material can prolong the service life of the inner sleeve and reduce the working temperature of the thermal superconducting medium.

To sum up, the present invention adopts a double-sleeve riser structure, and heat conduction between high-temperature waste gas and soft water is carried out through inorganic thermal superconducting technology, so as to achieve efficient and safe recovery of high-temperature waste gas heat; since the thermal superconducting element isolates waste gas and soft water. The contact between them prevents the possibility that the soft water of the outer sleeve will flow into the carbonization chamber when the inner sleeve is suddenly corroded and perforated, and realizes that the heat recovery system and equipment of high-temperature waste gas have the characteristics of intrinsic safety. High-temperature waste gas, superconducting heat transfer working fluid and soft water form a coupled high-efficiency high-temperature waste gas heat recovery system.

Description of drawings

Fig. 1 is a high-efficiency, intrinsically safe coke oven high-temperature waste gas cooling process flow diagram;

Fig. 2 is the sectional view of the riser pipe of embodiment 1;

Fig. 3 is the top view of Fig. 2;

4 is a cross-sectional view of a riser pipe of Embodiment 3;

Fig. 5 is the top view of Fig. 4;

FIG. 6 is an enlarged view of area A in FIG. 4 .

Detailed ways

Below in conjunction with embodiment, the present invention is further described:

Example 1

The present embodiment discloses a high-efficiency and intrinsically safe coke oven high-temperature waste gas cooling equipment. Between the inner sleeve and the outer sleeve of the riser tube 1, there are multiple sections of thermal superconducting elements along the height direction; when one section of the thermal superconducting element fails, the other sections of the thermal superconducting element can still continue to work. The height of the heated end of each section of the thermal superconducting element is 300-800 mm. The thermal superconducting working medium in the thermal superconducting element is prepared by using various inorganic or organic materials and compounds. This embodiment adopts the superconductivity characteristic of the thermal superconducting element to conduct the heat of the high-temperature waste gas to the soft water, isolate the heat exchange contact between the soft water and the high-temperature waste gas, and prevent the soft water from flowing into the carbonization when the inner sleeve is suddenly corroded and perforated. room possibility. It realizes that the cooling system and equipment of high temperature raw gas in the riser have the characteristics of intrinsic safety.

The multi-stage thermal superconducting elements are not connected, and each section of the thermal superconducting element is provided with a non-condensable gas exhaust stop valve 7 and a bursting disc safety device 3, and the non-condensable gas exhaust stop valve 7 regularly discharges the thermal superconductor. The non-condensable gas generated in the element maintains the thermal conductivity of the thermal superconducting element. The bursting disc safety device 3 is connected with the thermal superconducting element through the outer sleeve, the design pressure of the bursting disc safety device 3 is 3MPa, and the design pressure of the bursting disc safety device 3 is 3MPa. When the internal pressure of the thermal superconducting element exceeds the design pressure, the rupture disc safety device is destroyed, making the thermal superconducting element communicate with the atmosphere. Each thermal superconducting element can also be communicated with each other, and the connected thermal superconducting element is provided with a total non-condensable gas exhaust shut-off valve and a bursting disc safety device to reduce the installation quantity of the non-condensable gas exhaust valve and the bursting disc safety device.

The bottom and top of the inner sleeve are respectively provided with a high-temperature waste gas inlet and a waste gas outlet communicating with the inner sleeve, a soft water passage is formed between the outer sleeve and the thermal superconducting element, and the bottom and top of the outer sleeve are respectively provided with The soft water inlet and the soft water outlet communicated with the soft water passage; the inner wall of the inner sleeve is provided with refractory material, and the arrangement of the refractory material can prolong the service life of the inner sleeve and reduce the working temperature of the thermal superconducting medium.

The raw gas inlet of the rising pipe 1 is connected with the high-temperature raw gas outlet of the coke oven carbonization chamber, and the raw gas outlet of the rising pipe 1 is connected with the gas inlet of the circulating ammonia water spray device. The soft water outlet of the rising pipe 1 is communicated with the inlet of the evaporation tank 4, the steam outlet of the evaporation tank 4 is communicated with the steam pipe network, the hot water outlet of the evaporation tank 4 is communicated with the inlet of the hot water intermediate tank 5, and the hot water middle tank 5 is connected. The outlet of the tank 5 communicates with the soft water inlet of the riser 1 through the hot water pump 6 .

The process and equipment of the high-efficiency and intrinsically safe coke oven high-temperature waste gas heat recovery system in this embodiment adopts a double-sleeve structure riser, and a thermal superconducting element is installed in the space between the inner sleeve and the outer sleeve of the double-sleeve riser. The thermal superconducting elements are arranged in multiple stages along the height of the riser. The heat exchange between high-temperature waste gas and soft water is isolated by thermal superconducting elements, preventing the possibility of soft water flowing into the carbonization chamber when the inner sleeve is suddenly corroded and perforated. When the high-temperature waste gas passes through the riser, the thermal superconducting element absorbs the heat of the high-temperature waste gas, and quickly conducts the heat to the soft water, realizing the heat exchange between the high-temperature waste gas and the soft water through the thermal superconducting element.

Example 2

This embodiment discloses a high-efficiency, intrinsically safe coke oven high-temperature waste gas cooling process using the equipment described in Embodiment 1, comprising the following steps:

A. The high-temperature waste gas in the coke oven carbonization chamber enters the inner sleeve of the riser from the high-temperature waste gas inlet at the lower end of the double-sleeve riser;

B. The high-temperature waste gas flows upward along the inner sleeve and exchanges heat with the thermal superconducting element. The high-temperature waste gas at 650-750°C is cooled to about 400°C, and the waste gas is discharged from the waste gas outlet (outlet of the inner sleeve) at the upper end of the riser. Then, it is sprayed and cooled to about 78-75 ℃ by circulating ammonia water and enters the gas collecting pipe. In order to prevent the tar in the waste gas from sticking to the inner cylinder wall, the temperature of the waste gas at the outlet of the riser is 400-450℃.

C. A thermal superconducting element is installed between the inner sleeve and the outer cylinder of the double-sleeve riser, and the thermal superconducting element is arranged in multiple sections along the height of the riser. When the high-temperature waste gas flows upward along the inner sleeve of the riser, the thermal superconducting element absorbs the heat of the high-temperature waste gas and transfers the heat to the soft water quickly, so as to realize the heat exchange between the high-temperature waste gas and the soft water through the thermal superconducting element.

D. The outer sleeve space of the double-sleeve riser is the water path, and the heat conduction element is between the waste gas in the inner sleeve and the soft water in the outer sleeve; the hot water pump sends the soft water from the soft water inlet at the lower end of the outer sleeve, and the water is The downward and upward flow exchanges heat with the thermal superconducting element to heat up, and the hot water flows from the upper soft water outlet to the hot water main pipe.

E. Each section of the thermal superconducting element of the double-sleeve riser is provided with a non-condensable gas exhaust stop valve and a bursting disc safety device. Each thermal superconducting element is provided with a non-condensable gas exhaust shut-off valve, which regularly discharges the non-condensable gas generated in the thermal superconducting element and maintains the heat conduction efficiency of the thermal superconducting element. The bursting disc safety device is a pressure protection device for the thermal superconducting element. When the internal pressure of the thermal superconducting element exceeds the design pressure, the bursting disc safety device is destroyed, making the thermal superconducting element communicate with the atmosphere.

F. The hot water discharged from the rising pipes of each carbonization chamber is collected into the hot water main pipe, the hot water in the hot water main pipe flows to the evaporation tank, the steam generated by the evaporation tank is sent to the steam pipe network, and the hot water of the evaporation tank flows to the hot water intermediate tank . The inlet water temperature of the evaporation tank is 180～200℃, and the operating pressure is 1.0～1.5MPa.

G. The hot water in the hot water intermediate tank is pumped to the water inlet of the rising pipe of each carbonization chamber through the hot water pump. The hot water temperature of the hot water intermediate tank is 160～180℃, and the operating pressure is 0.6～1.0MPa.

In this embodiment, the high-temperature waste gas is cooled from 650-750°C to about 400°C, which reduces the cooling load of the gas primary cooler by 25-30%; 5t/t coke in circulating soft water can be saved, and 120kg/t coke in steam can be generated.

Example 3

This embodiment discloses a high-efficiency and intrinsically safe coke oven high-temperature waste gas heat recovery equipment, the structure of which is basically the same as that of the first embodiment, the difference is that the multi-stage thermal superconducting elements 2 are connected, and the connected thermal superconducting elements A total non-condensable gas exhaust shut-off valve and a total bursting disc safety device are provided.

In this embodiment, the thermal superconducting elements of each section of the double-sleeve riser are communicated with each other to reduce the number of installations of the non-condensable gas release valve and the bursting disc safety device.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (8)

1. The high-efficiency and intrinsically safe coke oven high-temperature raw gas heat recovery equipment is characterized by comprising a double-sleeve structural form ascending pipe (1), an evaporating pot (4) and a hot water intermediate tank (5), wherein a heat superconducting element (2) is arranged between an inner sleeve and an outer sleeve of the ascending pipe, and a non-condensable gas exhaust stop valve (7) and a rupture disk safety device (3) are arranged on the heat superconducting element (2); the bottom and the top of the inner sleeve are respectively provided with a high-temperature raw gas inlet and a raw gas outlet which are communicated with the inside of the inner sleeve, a soft water passage is formed between the outer sleeve and the heat superconducting element, and the bottom and the top of the outer sleeve are respectively provided with a soft water inlet and a soft water outlet which are communicated with the soft water passage;

a raw gas inlet of the ascending pipe 1 is communicated with a high-temperature raw gas outlet of a coke oven carbonization chamber, and a raw gas outlet of the ascending pipe 1 is communicated with a gas inlet of a circulating ammonia water spraying device; soft water outlet and the evaporimeter jar (4) entry intercommunication of tedge (1), evaporimeter jar (4) steam outlet and steam pipe network intercommunication, groove (5) entry intercommunication in the middle of evaporimeter jar (4) hot water outlet and the hot water, groove (5) export is passed through the soft water entry intercommunication of hot-water pump (6) and tedge (1) in the middle of the hot water.

2. The high-efficiency intrinsically-safe coke oven high-temperature raw gas heat recovery device as claimed in claim 1, characterized in that a plurality of sections of heat superconducting elements are arranged between an inner sleeve and an outer sleeve of the ascending pipe (1) along the height direction;

the multiple sections of heat superconducting elements are not communicated, and each section of heat superconducting element is provided with a non-condensable gas exhaust stop valve and a rupture disk safety device;

or the multiple sections of heat superconducting elements are communicated, and the communicated heat superconducting elements are provided with a total noncondensable gas exhaust stop valve and a total rupture disk safety device.

3. The high-efficiency intrinsically-safe coke oven high-temperature raw gas heat recovery equipment as claimed in claim 2, wherein the height of the heated end of each section of the thermal superconducting element is 300-800 mm.

4. The high-efficiency intrinsically-safe coke oven high-temperature raw gas heat recovery device of claim 1, wherein the inner wall of the inner sleeve is lined with a refractory material.

5. A high-efficiency and intrinsically safe coke oven high-temperature raw gas heat recovery process is characterized by comprising the following steps:

high-temperature raw gas flows from bottom to top in the inner sleeve to exchange heat with the heat superconducting element, and the cooled raw gas is discharged from a raw gas outlet to the circulating ammonia water spraying device;

soft water is sent into a soft water passage between the outer sleeve and the heat superconducting element from a soft water inlet of the ascending pipe, and flows out from a soft water outlet after heat exchange and temperature rise of the soft water and the heat superconducting element and flows into the evaporation tank through a hot water main pipe; the steam generated by the evaporation tank is sent to a steam pipe network, and the hot water of the evaporation tank flows to the hot water intermediate tank from the outlet; and the hot water in the hot water intermediate tank is sent to the soft water inlet of the ascending pipe again through the hot water pump to be circularly heated.

6. The efficient and intrinsically safe coke oven high-temperature raw gas heat recovery process as claimed in claim 5, wherein the temperature of the high-temperature raw gas is 650-750 ℃, and the temperature of the raw gas obtained by cooling is 400-450 ℃.

7. The high-efficiency and intrinsically safe coke oven high-temperature raw gas heat recovery process of claim 5, wherein the water inlet temperature of the evaporation tank is 180-200 ℃, and the operating pressure is 1.0-1.5 MPa.

8. The high-efficiency and intrinsically safe coke oven high-temperature raw gas heat recovery process as claimed in claim 5, wherein the hot water temperature of the hot water intermediate tank is 160-180 ℃, and the operating pressure is 0.6-1.0 MPa.

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