Dry quenching system non-working-condition operation flue gas waste heat recycling device

Abstract

The utility model provides a flue gas waste heat recycling device for non-working-condition operation of a dry quenching system, which belongs to the technical field of flue gas waste heat recycling and comprises a deoxygenization water supply and water supply pipeline, a heat pipe heat exchanger, a deoxygenization water supply and water return pipeline, a water mixing pipeline, a pressure and temperature monitoring system and a temperature recording interlocking alarm. A water inlet of the heat pipe heat exchanger is communicated with a deoxygenization water supply pipeline; the deoxidizing water supply and return pipeline is communicated with a water outlet of the heat pipe heat exchanger; the water mixing pipeline comprises a first branch pipe, a water mixing pump and an electric control valve, the two ends of the first branch pipe are communicated with the deoxygenization water supply and water supply pipeline and the deoxygenization water supply and water return pipeline respectively, and the water mixing pump and the electric control valve are both arranged at the first branch pipe; according to the device, the temperature of the return water can be monitored conveniently, it is ensured that the temperature of the return water reaches a set value, and meanwhile the problem of acid dew point corrosion caused by too low temperature of the pipe wall of the inlet flue gas pipeline of the dry quenching body is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the flue gas waste heat recycling technical field, specifically relates to a dry quenching system non - working condition operation flue gas waste heat recycling device. BACKGROUND

[0002] At present, in the dry quenching circulating gas waste heat utilization system, it is usually composed of heat pipe heat exchanger, desalted water tank, deaerator, deaerated feedwater supply pipeline, backwater pipeline and water pump. The 160 DEG C dry quenching circulating fan outlet flue gas exchanges heat with the 60 DEG C deaerated feedwater supply in the heat pipe heat exchanger, and the deaerated feedwater backwater is lifted to 95 DEG C, and the dry quenching body import flue gas pipeline temperature lower limit value is controlled to be higher than 115 DEG C, to prevent the sulfuric acid vapor in the flue gas from condensing and corroding the pipe wall when the pipe wall temperature is lower than the corrosion temperature of the acid dew point.

[0003] But in actual production working condition, the dry quenching body import flue gas pipeline temperature is often lower than 115 DEG C, and the reasons are as follows two points, reason one: the temperature of dry quenching prestorage chamber and circulating fan outlet when conventional design is not consistent with the temperature of dry quenching prestorage chamber and circulating fan outlet when actual operation, leading to the deaerated feedwater supply temperature and deaerated feedwater backwater temperature applied to conventional design flow are not applicable to actual working condition;Reason two: when conventional design, dry quenching system working condition is full load operation, and there is no low load state reserved treatment measure, when dry quenching system low load operation, the circulating fan outlet circulating gas temperature is lower than 160 DEG C, and since the deaerated feedwater supply backwater temperature and flow are constant, the deaerated feedwater supply backwater heat absorption amount is constant, so that the heat pipe heat exchanger outlet temperature is lower than 115 DEG C. Utility model content

[0004] Based on the above technical problems, the utility model provides a dry quenching system non - working condition operation flue gas waste heat recycling device, which is characterized by being provided with a water mixing pump and an electric regulating valve between the deaerated feedwater supply pipeline and the deaerated feedwater backwater pipeline, and a temperature recording interlocking alarm is installed on the deaerated feedwater backwater pipeline, so as to monitor the temperature of the backwater, ensure that the temperature of the backwater reaches the set value, and avoid the problem of acid dew point corrosion caused by the pipe wall of the dry quenching body import flue gas pipeline due to too low temperature.

[0005] Its specific technical scheme is as follows:

[0006] A device for recovering and utilizing waste heat from flue gas in a non-operating state of a dry quenching system comprises: a deaerator water supply pipe, a heat pipe heat exchanger, a deaerator water return pipe, a mixing water pipe, a pressure and temperature monitoring system and a temperature recording interlock alarm; the water inlet of the heat pipe heat exchanger is connected to the deaerator water supply pipe; the deaerator water return pipe is connected to the water outlet of the heat pipe heat exchanger; the mixing water pipe comprises a first branch pipe, a mixing water pump and an electric regulating valve, the two ends of the first branch pipe are respectively connected to the deaerator water supply pipe and the deaerator water return pipe, and the mixing water pump and the electric regulating valve are both arranged at the first branch pipe; the pressure and temperature monitoring systems are respectively arranged at the deaerator water supply pipe and the deaerator water return pipe; the temperature recording interlock alarm is arranged on the deaerator water return pipe, and the temperature recording interlock alarm is located between the first branch pipe and the heat pipe heat exchanger.

[0007] In addition, the device for recovering and utilizing waste heat from flue gas in a non-operating state of a dry coke quenching system in the above technical solution provided by the present invention may also have the following additional technical features:

[0008] In the above technical solution, the pressure and temperature monitoring system includes: a first pipeline monitoring system and a second pipeline monitoring system; the first pipeline monitoring system is arranged at the deaeration water supply pipeline, and the first pipeline monitoring system includes a first remote thermometer, a first on-site thermometer, a first on-site pressure gauge and a first remote pressure gauge; the second pipeline monitoring system is arranged at the deaeration water return pipeline, and the second pipeline monitoring system includes a second remote thermometer, a second on-site thermometer, a second on-site pressure gauge and a second remote pressure gauge.

[0009] The above technical solution also includes: a first gate valve and a second gate valve; the first gate valve is arranged between the deaerated water supply pipe and the water inlet of the heat pipe heat exchanger; the second gate valve is arranged between the deaerated water return pipe and the water outlet of the heat pipe heat exchanger.

[0010] The above technical solution also includes: a second branch pipe and a bypass valve; the two ends of the second branch pipe are respectively connected to the deaerated water supply pipe and the deaerated water return pipe; the bypass valve is arranged at the second branch pipe.

[0011] The above technical solution also includes: a third gate valve and a fourth gate valve; the third gate valve is arranged on the first branch pipe, and the third gate valve is located on a side close to the deaerated water supply pipe; the fourth gate valve is arranged on the first branch pipe, and the fourth gate valve is located on a side close to the deaerated water return pipe.

[0012] The above technical solution also includes: a check valve; the check valve is arranged on the deoxygenated water supply pipeline.

[0013] The above technical solution also includes: a circulating fan and a reducing pipe; the inlet of the circulating fan is connected to the CDQ secondary dust collector through a flue gas duct; the two ends of the reducing pipe are respectively connected to the outlet of the circulating fan and the air inlet of the heat pipe exchanger.

[0014] When the flue gas temperature at the CDQ inlet falls below the lower limit of 115°C, the mixing pump is activated. The pump mixes the deaerated feedwater return water that has not reached 95°C with the deaerated feedwater supply at 60°C before sending it to the heat pipe exchanger for secondary heat exchange. The deaerated feedwater return flow rate threshold through the mixing pump is controlled by the opening of the electric regulating valve controlled by the proportional temperature drop in the CDQ inlet flue gas duct. The deaerated feedwater supply and partial deaerated feedwater return water mix, increasing their temperature while maintaining the same flow rate. This reduces the heat exchange rate between the unit cooling fluid and the circulating gas, raising the flue gas duct temperature at the CDQ inlet and the deaerated feedwater return temperature. To prevent prolonged operation of the mixing pump (14) causing the deaerated feedwater return temperature to exceed the vaporization temperature of water, which could cause vibration in the heat pipe exchanger and pose a safety hazard, a remote temperature measurement point on the deaerated feedwater return duct is interlocked with the mixing pump. The mixing pump is shut down when the deaerated feedwater return temperature exceeds 95°C. When the mixing water pump meets the pump start and pump stop conditions at the same time, the pump stop operation has a higher priority than the pump start operation.

[0015] Compared with the prior art, the utility model provides a device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system. The beneficial effects are as follows:

[0016] 1. By adding a first branch pipe, a mixing pump and an electric regulating valve between the deaeration water supply pipe and the deaeration water return pipe, and installing a temperature recording interlock alarm on the deaeration water return pipe, the deaeration water supply can be heated by fully utilizing the waste heat of the CDQ circulating flue gas, ensuring that the deaeration water return temperature is maintained within the predetermined value, and ensuring that the temperature of the CDQ main body inlet flue gas pipe is within a safe range, thereby preventing acid dew point corrosion in the CDQ main body inlet flue gas pipe.

[0017] 2. By adding the third and fourth gate valves on both sides of the mixing pump to facilitate the maintenance of the mixing pump, the maintenance cost and downtime of the system are reduced.

[0018] 3. By combining the temperature recording interlock alarm with the pressure and temperature monitoring system, the temperature and pressure changes in the system can be monitored in real time, thereby automatically adjusting the working status of the mixing pump and the opening of the electric control valve, thereby improving the level of automation and operating efficiency.

[0019] 4. The combination of temperature recording interlock alarm and pressure temperature monitoring system improves the stability and reliability of the entire system under non-operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a structural diagram of a non-operating flue gas waste heat recovery and utilization device for a dry coke quenching system according to the present invention;

[0021] Figure 2 This is a schematic diagram of the connection structure of the inlet and outlet flue gas pipes of the heat pipe heat exchanger of the utility model;

[0022] in, Figures 1 to 2 The corresponding relationship between the reference numerals and component names is as follows:

[0023] 10 Deaeration water supply pipeline, 11 Heat pipe heat exchanger, 12 Deaeration water return pipeline, 13 First branch pipe, 14 Mixing pump, 15 Electric regulating valve, 16 Temperature recording interlock alarm, 17 First remote thermometer, 18 First local thermometer, 19 First local pressure gauge, 20 First remote pressure gauge, 21 Second remote thermometer, 22 Second local thermometer, 23 Second local pressure gauge, 24 Second remote pressure gauge, 25 First gate valve, 26 Second gate valve, 27 Second branch pipe, 28 Bypass valve, 29 Third gate valve, 30 Fourth gate valve, 31 Check valve, 32 Circulation fan, 33 Reducer, 34 CDQ secondary dust collector. DETAILED DESCRIPTION

[0024] The following is a combination of specific implementation cases and attached Figures 1-2 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0025] A device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system, such as Figures 1-2 As shown, it includes: a deoxygenated water supply pipeline 10, a heat pipe heat exchanger 11, a deoxygenated water return pipeline 12, a mixing water pipeline, a pressure and temperature monitoring system and a temperature recording interlock alarm 16; the water inlet of the heat pipe heat exchanger 11 is connected to the deoxygenated water supply pipeline 10; the deoxygenated water return pipeline 12 is connected to the water outlet of the heat pipe heat exchanger 11; the mixing water pipeline includes a first branch pipe 13, a mixing water pump 14 and an electric regulating valve 15, and the two ends of the first branch pipe 13 are respectively connected to the deoxygenated water supply pipeline 10 and the deoxygenated water return pipeline 12, and the mixing water pump 14 and the electric regulating valve 15 are both arranged on the first branch pipe 13; the pressure and temperature monitoring systems are respectively arranged on the deoxygenated water supply pipeline 10 and the deoxygenated water return pipeline 12; the temperature recording interlock alarm is arranged on the deoxygenated water return pipeline 12, and the temperature recording interlock alarm is located between the first branch pipe 13 and the heat pipe heat exchanger 11.

[0026] When the deaeration water supply pipe enters the main circuit, it passes through the check valve and the third gate valve into the heat pipe heat exchanger, and the front end of the check valve is provided with a first pipeline monitoring system. After the water passes through the flue gas in the heat pipe heat exchanger for heat exchange, it is discharged to the deaeration water return pipe through the fourth gate valve. The water return pipe is provided with a second pipeline monitoring system and a temperature recording interlock alarm, thus forming a closed loop; 1. When the deaeration water return temperature is not higher than 95°C, the temperature of the flue gas pipe at the CDQ body inlet is lower than 115°C, the interlock is turned on after a delay of 5s. When the mixing pump is turned on, When the water pump is running and the flue gas temperature at the CDQ unit inlet is below 100°C, the electric control valve is set to 100% opening. 2. When the mixing water pump is running and the flue gas temperature at the CDQ unit inlet is below 108°C but not below 100°C, the electric control valve is set to 80% opening. 3. When the mixing water pump operation signal is received, the electric control valve is interlocked and opened with a delay of 2 seconds, and the electric control valve opening is set to 50%. 4. When the deaerated feedwater return temperature reaches 95°C, the mixing water pump is interlocked and closed with a delay of 5 seconds. After the mixing water pump operation signal disappears, the electric control valve is interlocked and closed with a delay of 2 seconds.

[0027] Among them, the opening and closing of the mixing water pump and electric regulating valve are controlled by PLC.

[0028] By adopting the above technical solution, a first branch pipe 13, a mixing pump 14, and an electric regulating valve 15 are added between the deaerated feed water supply pipe 10 and the deaerated feed water return pipe 12, and a temperature recording interlock alarm 16 is installed on the deaerated feed water return pipe 12. This makes it possible to fully utilize the waste heat of the CDQ circulating flue gas to heat the deaerated feed water, ensure that the deaerated feed water return temperature is maintained within a predetermined value, and ensure that the temperature of the CDQ main body inlet flue gas pipe is within a safe range, thereby preventing acid dew point corrosion in the CDQ main body inlet flue gas pipe. Furthermore, by combining the temperature recording interlock alarm 16 with the pressure and temperature monitoring system, temperature and pressure changes in the system can be monitored in real time, thereby automatically adjusting the operating status of the mixing pump 14 and the opening of the electric regulating valve 15, thereby improving the level of automation and operational efficiency.

[0029] Specifically, the temperature recording interlock alarm 16 and the pressure and temperature monitoring system are used in combination to improve the stability and reliability of the entire system under non-operating conditions.

[0030] Specifically, for dry quenching coke systems with different processing capacities, the lift of the water mixing pump 14 is comprehensively selected based on the amount of circulating gas and the amount of deoxygenated water supply.

[0031] Specifically, by placing the mixing pump 14 at the inlet and outlet of the sample feed water and the deaerator feed water return of the heat pipe heat exchanger 11, the pipe resistance along the pipe is reduced, the pump head is small, and the reaction speed is fast. Without affecting the normal operation of the CDQ system, the waste heat of the CDQ circulating gas is fully utilized to heat the deaerator feed water, ensuring the deaerator feed water return temperature and preventing acid dew point corrosion in the CDQ main inlet pipe. This effectively prevents improper operation by maintenance personnel during non-operating conditions, which could cause an imbalance in the steam-water ratio in the deaerator, resulting in a false liquid level in the deaerator and causing the interlocking circulation fan and boiler feed water pump to stop.

[0032] In the embodiment of the present utility model, as Figure 1 As shown, the pressure and temperature monitoring system includes: a first pipeline monitoring system and a second pipeline monitoring system; the first pipeline monitoring system is arranged at the deaerated water supply pipeline 10, and the first pipeline monitoring system includes a first remote thermometer 17, a first on-site thermometer 18, a first on-site pressure gauge 19 and a first remote pressure gauge 20; the second pipeline monitoring system is arranged at the deaerated water return pipeline 12, and the second pipeline monitoring system includes a second remote thermometer 21, a second on-site thermometer 22, a second on-site pressure gauge 23 and a second remote pressure gauge 24.

[0033] By setting a first remote thermometer 17 and a second remote thermometer 21, the temperature data of the deoxygenated water supply pipeline 10 and the deoxygenated water return pipeline 12 are remotely transmitted respectively, so that the central control system can monitor in real time; by setting a first on-site thermometer 18 and a second on-site thermometer 22, the operator can directly check the temperature of the supply water and the return water; the pressure of the deoxygenated water supply pipeline 10 and the deoxygenated water return pipeline 12 are displayed respectively by the first on-site pressure gauge 19 and the second on-site pressure gauge 23, so that the operator can understand the water supply pressure in time; the pressure data of the deoxygenated water supply pipeline 10 and the deoxygenated water return pipeline 12 are remotely transmitted respectively by the first remote pressure gauge 20 and the second remote pressure gauge 24, so that the central control system can monitor in real time.

[0034] Specifically, in order to prevent the mixing water pump 14 from working for a long time, causing the return temperature of the deoxygenated feed water to be higher than the vaporization temperature of water, thereby causing vibration of the heat pipe heat exchanger 11 and posing a safety hazard, the second remote thermometer 21 on the deoxygenated feed water return pipe 12 is interlocked with the mixing water pump 14. When the return temperature of the deoxygenated feed water is higher than 95°C, the mixing water pump 14 is interlocked and shut down. When the mixing water pump 14 meets the conditions for starting and stopping the pump at the same time, the priority of the pump stopping operation is higher than the pump starting operation.

[0035] In the embodiment of the present utility model, as Figure 1As shown, it also includes: a first gate valve 25 and a second gate valve 26; the first gate valve 25 is arranged between the deoxygenated water supply pipe 10 and the water inlet of the heat pipe heat exchanger 11; the second gate valve 26 is arranged between the deoxygenated water return pipe 12 and the water outlet of the heat pipe heat exchanger 11.

[0036] When inspection or maintenance is required, the heat pipe heat exchanger 11 is isolated from the deaerated water supply pipe 10 and the deaerated water return pipe 12 by closing the first gate valve 25 and the second gate valve 26 for safe operation, thereby preventing the accident from expanding.

[0037] In an embodiment of the present utility model, it further includes: a second branch pipe 27 and a bypass valve 28; both ends of the second branch pipe 27 are respectively connected to the deoxygenated water supply pipe 10 and the deoxygenated water return pipe 12; the bypass valve 28 is arranged at the second branch pipe 27.

[0038] By providing the bypass valve 28 and the second branch pipe 27 , the purpose of allowing the supply water to flow through the second branch pipe 27 and be discharged when a problem occurs in the heat exchanger 11 with the heat exchange tubes is achieved.

[0039] In the embodiment of the present utility model, as Figure 1 As shown, it also includes: a third gate valve 29 and a fourth gate valve 30; the third gate valve 29 is arranged on the first branch pipe 13, and the third gate valve 29 is located on a side close to the deaerated water supply pipe 10; the fourth gate valve 30 is arranged on the first branch pipe 13, and the fourth gate valve 30 is located on a side close to the deaerated water return pipe 12.

[0040] By providing the third gate valve 29 and the fourth gate valve 30 , an operator can close the third and fourth gate valves 30 , thereby facilitating maintenance or replacement of the water mixing pump 14 .

[0041] In the embodiment of the present utility model, as Figure 1 As shown, it also includes: a check valve 31; the check valve 31 is arranged on the deoxygenated water supply pipeline 10.

[0042] The check valve 31 is provided to prevent the water in the heat pipe heat exchanger 11 from flowing back to the deoxygenated water supply pipe 10 .

[0043] In the embodiment of the present utility model, as Figure 2 As shown, it also includes: a circulating fan 32 and a reducing pipe 33; the inlet of the circulating fan 32 is connected to the CDQ secondary dust collector 34 through a flue gas duct; the two ends of the reducing pipe 33 are respectively connected to the outlet of the circulating fan 32 and the air inlet of the heat pipe heat exchanger 11.

[0044] The circulating fan 32 and the heat pipe heat exchanger 11 are connected via the reducing pipe 33 so that the flue gas can smoothly enter the heat pipe heat exchanger 11 .

[0045] Implementation: When the flue gas temperature at the CDQ inlet falls below the lower limit of 115°C, mixing pump 14 is activated. It mixes the deoxygenated feedwater return water that hasn't reached 95°C with the deoxygenated feedwater at 60°C before sending it to heat pipe heat exchanger 11 for secondary heat exchange. The deoxygenated feedwater return flow rate threshold through mixing pump 14 is controlled by controlling the opening of electric regulating valve 15 in proportion to the temperature drop in the CDQ inlet flue gas duct. The deoxygenated feedwater return water mixes with the deoxygenated feedwater return water, increasing its temperature while maintaining the same flow rate. This reduces the heat exchange rate between the unit cooling fluid and the circulating gas, increases the flue gas duct temperature at the CDQ inlet, and increases the deoxygenated feedwater return temperature. To prevent the deaerated feedwater return temperature from exceeding the vaporization temperature due to prolonged operation of mixing pump 14, which could cause vibration in heat pipe heat exchanger 11 and create a safety hazard, a remote temperature measurement point on deaerated feedwater return pipe 12 is interlocked with mixing pump 14. When the deaerated feedwater return temperature exceeds 95°C, mixing pump 14 is shut down. When mixing pump 14 meets both the start and stop conditions, the stop operation takes priority over the start operation.

[0046] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise expressly defined, the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connect," "install," and "fix" should be understood in a broad sense. For example, "connection" can mean a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0047] In the description of this utility model, the terms "one embodiment," "some embodiments," "specific embodiments," etc., mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the utility model. In this utility model, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system, characterized in that: include: Deaerated water supply pipeline; a heat pipe heat exchanger, wherein the water inlet of the heat pipe heat exchanger is connected to the deoxygenated water supply pipeline; a deoxygenated water supply return pipe, the deoxygenated water supply return pipe being connected to the water outlet of the heat pipe heat exchanger; A mixed water pipeline, comprising a first branch pipe, a mixed water pump and an electric regulating valve, wherein both ends of the first branch pipe are respectively connected to the deaerated water supply pipe and the deaerated water return pipe, and the mixed water pump and the electric regulating valve are both arranged at the first branch pipe; A pressure and temperature monitoring system, wherein the pressure and temperature monitoring systems are respectively arranged at the deaerated water supply pipe and the deaerated water return pipe; A temperature recording interlock alarm is provided on the deoxygenated water supply return pipe, and the temperature recording interlock alarm is located between the first branch pipe and the heat pipe heat exchanger.

2. The device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system according to claim 1 is characterized in that: The pressure and temperature monitoring system comprises: a first pipeline monitoring system, the first pipeline monitoring system being arranged at the deaerated water supply pipeline, and the first pipeline monitoring system comprising a first remote thermometer, a first on-site thermometer, a first on-site pressure gauge and a first remote pressure gauge; The second pipeline monitoring system is arranged at the deoxygenated water return pipeline, and the second pipeline monitoring system includes a second remote thermometer, a second on-site thermometer, a second on-site pressure gauge and a second remote pressure gauge.

3. The device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system according to claim 2 is characterized in that: Also includes: a first gate valve, the first gate valve being arranged between the deoxygenated water supply pipeline and the water inlet of the heat pipe exchanger; A second gate valve is provided between the deoxygenated feed water return pipe and the water outlet of the heat pipe exchanger.

4. The device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system according to claim 3 is characterized in that: Also includes: a second branch pipe, wherein both ends of the second branch pipe are respectively connected to the deaerated water supply pipe and the deaerated water return pipe; A bypass valve is provided at the second branch pipe.

5. The device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system according to claim 4 is characterized in that: Also includes: a third gate valve, the third gate valve being arranged on the first branch pipe and being located on a side close to the deaerated water supply pipeline; The fourth gate valve is provided on the first branch pipe, and the fourth gate valve is located on a side close to the deoxygenated feed water return pipe.

6. The device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system according to claim 5 is characterized in that: Also includes: A check valve is provided on the deaerated water supply pipeline.

7. The device for recovering waste heat from flue gas in a non-operating state of a dry coke quenching system according to claim 6 is characterized in that: Also includes: A circulating fan, the inlet of which is connected to the CDQ secondary dust collector through a flue gas duct; A reducing pipe, both ends of which are respectively connected to the outlet of the circulation fan and the air inlet of the heat pipe exchanger.

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