CN-122015534-A - Corrosion-resistant and scale-resistant flue gas waste heat recovery device

Abstract

The application provides an anti-corrosion and anti-scale smoke waste heat recovery device which comprises a shell and a heat exchange tube bundle arranged in the shell, wherein the heat exchange tube bundle is provided with a smoke flow channel and a heat exchange working medium flow channel, a nano hydrophobic ash-repellent coating is arranged on the inner wall of the smoke flow channel, the contact angle is more than or equal to 120 degrees, the device also comprises a cleaning tube and an air supply system, the cleaning tube is arranged in the shell, a plurality of nozzles are arranged on the cleaning tube, jet orifices of the nozzles extend into the smoke flow channel, and an air inlet of the cleaning tube is connected with the air supply system. The anti-corrosion and anti-scale flue gas waste heat recovery device constructs a double anti-scale and anti-corrosion mechanism of active protection and online cleaning, can solve the problem of coupling degradation of dust accumulation and corrosion faced by the traditional device, remarkably improves the long-term stability of heat exchange efficiency, prolongs the service life of equipment, avoids frequent shutdown and maintenance, and greatly reduces the operation cost.

Inventors

• YOU LIANG
• LIU YUQIN
• XUE NING
• JI HAIMIN
• LEI YU
• WANG BO
• ZHENG DI
• SHI LILONG
• JI JIEHONG
• ZHANG ZHIXIANG
• XU DANGQI
• XU XINGGUO
• WU ZHENHAI
• DU YANCHENG
• CHEN SHAOHUA
• XIE HUANBIAO

Assignees

• 华能汕头海门发电有限责任公司
• 西安热工研究院有限公司

Dates

Publication Date

20260512

Application Date

20260311

Claims (9)

1. 1. The device comprises a shell and a heat exchange tube bundle arranged in the shell, wherein the heat exchange tube bundle is provided with a smoke flow passage and a heat exchange working medium flow passage, the device is characterized in that a nano hydrophobic ash-repellent coating is arranged on the inner wall of the smoke flow passage, the contact angle is more than or equal to 120 degrees, the device further comprises a cleaning tube and an air supply system, the cleaning tube is arranged in the shell, a plurality of nozzles are arranged on the cleaning tube, the jet openings of the nozzles extend into the smoke flow passage, and the air inlet of the cleaning tube is connected with the air supply system.
2. 2. The corrosion and scale resistant flue gas waste heat recovery device of claim 1, wherein the cleaning tubes extend in the axial direction of the heat exchange tube bundle and the nozzles are spaced apart in the axial direction of the cleaning tubes.
3. 3. The corrosion and scale resistant flue gas waste heat recovery device of claim 1, wherein the cleaning tube is mounted to the housing by a stationary assembly.
4. 4. The anti-corrosion and anti-scaling smoke waste heat recovery device according to claim 3, wherein the fixing assembly comprises a mounting seat and a first clamp, the mounting seat is mounted on the shell, the first clamp is arranged on the mounting seat, and the cleaning pipe is arranged in the first clamp in a penetrating mode.
5. 5. The corrosion and scale resistant flue gas waste heat recovery device according to claim 4, wherein the mounting base is a T-shaped support plate, and the mounting base is configured to be fastened to the housing by bolts.
6. 6. The corrosion and scale resistant flue gas waste heat recovery device of claim 4, wherein the securing assembly further comprises a second clip, the second clip being connected between the mounting block and the first clip, the heat exchange tube bundle being disposed through the second clip.
7. 7. The corrosion and scale resistant flue gas waste heat recovery device according to claim 1, wherein the gas supply system comprises a gas storage tank, a solenoid valve and an air compressor, a gas outlet of the gas storage tank is connected with a gas inlet of the cleaning pipe, the solenoid valve is arranged at the gas outlet of the gas storage tank or the gas inlet of the cleaning pipe, and the air compressor is communicated with a gas inlet end of the gas storage tank and is used for providing high-pressure gas to the gas storage tank.
8. 8. The corrosion and scale resistant flue gas waste heat recovery device of claim 1, further comprising an intelligent control system comprising a first temperature sensor, a second temperature sensor and a controller, wherein the first temperature sensor and the second temperature sensor are respectively arranged at a flue gas inlet and a flue gas outlet of the flue gas flow channel and are used for collecting temperatures of the flue gas inlet and the flue gas outlet in real time, and the controller is in communication connection with the first temperature sensor and the second temperature sensor and is configured to be capable of calculating a temperature difference between the flue gas inlet and the flue gas outlet and controlling the start and stop of the air supply system according to the temperature difference.
9. 9. The corrosion and scale resistant flue gas waste heat recovery device of claim 8, wherein the controller is specifically configured to control the gas supply system to activate when the temperature difference between the flue gas inlet and the flue gas outlet is below a set threshold.

Description

Corrosion-resistant and scale-resistant flue gas waste heat recovery device Technical Field The application relates to the technical field of energy-saving, environment-friendly and heat energy engineering, in particular to an anti-corrosion and anti-scale smoke waste heat recovery device. Background In the industrial processes of coal-fired power generation, biomass utilization, garbage incineration, chemical production and the like, high-temperature flue gas carries a large amount of recoverable heat energy, and the flue gas waste heat recovery device is used as energy-saving and environment-friendly core equipment, so that the heat energy can be converted into available energy, and the energy consumption and carbon emission of enterprises are reduced. The existing flue gas waste heat recovery device adopts a finned tube type, a tube type or a double-tube type heat exchanger structure, but has the following prominent technical defects in actual operation: 1. The problems of ash deposition and scaling are remarkable, namely fly ash, alkali metal salt, tar and acid medium contained in the flue gas are easy to perform physical deposition and chemical reaction on the wall surface of the low-temperature heat exchange tube to form a compact and difficult-to-clean scale layer, so that the heat transfer resistance is greatly increased, the waste heat recovery efficiency is continuously reduced, and even a heat exchange channel is blocked when the waste heat recovery efficiency is severe, so that equipment is forced to stop; 2. The traditional device is of a fixed structure, lacks online ash removing capability, needs to be stopped periodically for manual ash removing or high-pressure water flushing, interrupts the production flow, has the problems of incomplete ash removing, high labor intensity, long maintenance period and the like, and remarkably improves the operation cost; 3. the corrosion and the economical contradiction are remarkable, namely, the acid medium in the flue gas is easy to corrode the heat exchange pipe, the corrosion resistance of the common carbon steel is poor, the service life is short, and the corrosion resistance of the whole stainless steel or the corrosion resistant alloy material can be improved, but the material cost is high, so that the large-scale popularization and application are difficult; 4. The active protection and intelligent adaptation are lacking, the problems of corrosion or dust accumulation in the prior art such as ND steel materials, enamel coatings and the like can be only singly relieved, the difficult problem of 'corrosion-dust accumulation' coupling degradation can not be solved, an intelligent monitoring and active cleaning triggering mechanism is not available, the fluctuation scene of smoke parameters is difficult to adapt, and the protection effect is unstable. Disclosure of Invention The embodiment of the application at least provides an anti-corrosion and anti-scale flue gas waste heat recovery device, and a double anti-scale and anti-corrosion mechanism of active protection and on-line cleaning is constructed, so that the problem of 'dust accumulation-corrosion' coupling degradation faced by the traditional device can be solved, the long-term stability of heat exchange efficiency is obviously improved, the service life of equipment is prolonged, frequent shutdown maintenance is avoided, and the running cost is greatly reduced. The embodiment of the application provides an anti-corrosion and anti-scale smoke waste heat recovery device which comprises a shell and a heat exchange tube bundle arranged in the shell, wherein the heat exchange tube bundle is provided with a smoke flow channel and a heat exchange working medium flow channel, a nano hydrophobic ash-repellent coating is arranged on the inner wall of the smoke flow channel, the contact angle is more than or equal to 120 degrees, the device also comprises a cleaning tube and an air supply system, the cleaning tube is arranged in the shell, a plurality of nozzles are arranged on the cleaning tube, the injection openings of the nozzles extend into the smoke flow channel, and the air inlets of the cleaning tube are connected with the air supply system. In an alternative embodiment, the cleaning tubes extend in the axial direction of the heat exchange tube bundle, and the nozzles are spaced apart in the axial direction of the cleaning tubes. In an alternative embodiment, the cleaning tube is mounted to the housing by a securing assembly. In an alternative embodiment, the fixing component comprises a mounting seat and a first clamp, the mounting seat is mounted on the shell, the first clamp is arranged on the mounting seat, and the cleaning pipe is arranged in the first clamp in a penetrating mode. In an alternative embodiment, the mounting is a T-shaped support plate, the mounting being arranged to be secured to the housing by means of bolts. In an alternative embodiment, the fixing assembly further comprise