CN-224215860-U - Device for preventing dust accumulation and corrosion of waste heat recovery heat exchanger at outlet of SCR reactor of industrial boiler

Abstract

The device comprises a medium-temperature section ND steel light pipe type heat exchange tube group, a low-temperature section ND steel light pipe type heat exchange tube group, a shock wave soot blower and a heat exchanger water inlet mixed heat temperature regulating system, wherein the medium-temperature section ND steel light pipe type heat exchange tube group is arranged at the upper part of the low-temperature section ND steel light pipe type heat exchange tube group, the shock wave soot blower is positioned at the position of 300-450mm of the uppermost tube of the low-temperature section ND steel light pipe type heat exchange tube group, and is arranged in front of a water inlet of the low-temperature section ND steel light pipe type heat exchange tube group. The utility model has the characteristics of sulfuric acid corrosion resistance, heat exchange tube wall temperature higher than the dew point of flue gas water, strong ash removing capability of the shock wave ash remover and difficult ash deposition.

Inventors

• NIU YANQING
• XU CHUNMING
• SHI XIAOYONG
• NIU HONGBO
• CAO JUNMIN
• LIU YUANWU
• GUO JUN
• LI FANG
• QIN GUO

Assignees

• 西安交通大学
• 克拉玛依市独山子区晟通热力有限责任公司
• 新疆四方锅炉有限公司

Dates

Publication Date

20260508

Application Date

20250611

Claims (6)

1. 1. The device for preventing the dust accumulation corrosion of the heat exchanger for recycling the waste heat at the outlet of the SCR reactor of the industrial boiler is characterized by comprising a medium-temperature section ND steel light pipe type heat exchange tube group (1), a low-temperature section ND steel light pipe type heat exchange tube group (2), a shock wave soot blower (3) and a heat exchanger water inlet mixed heat temperature regulating system (4); the medium-temperature section ND steel light pipe type heat exchange tube group (1) is arranged at the upper part of the low-temperature section ND steel light pipe type heat exchange tube group (2), the shock wave soot blower (3) is positioned at the 300-450mm position of the uppermost row of tubes of the low-temperature section ND steel light pipe type heat exchange tube group (2), and is arranged in front of the water inlet of the low-temperature section ND steel light pipe type heat exchange tube group (2); The heat exchanger water inlet mixed heating temperature regulating system (4) is connected to a water inlet pipeline of the low-temperature section ND steel light pipe type heat exchange tube group (2).
2. 2. The ash deposition corrosion prevention device for the industrial boiler SCR reactor outlet waste heat recovery heat exchanger according to claim 1, wherein the medium-temperature section ND steel light pipe type heat exchange tube group (1) and the low-temperature section ND steel light pipe type heat exchange tube group (2) are of light pipe type structures.
3. 3. The ash deposition corrosion prevention device for the industrial boiler SCR reactor outlet waste heat recovery heat exchanger according to claim 1, wherein the medium-temperature section ND steel light pipe type heat exchange tube group (1) is arranged in a serpentine shape, and the low-temperature section ND steel light pipe type heat exchange tube group (2) is arranged in an s shape.
4. 4. The ash deposition corrosion prevention device for the industrial boiler SCR reactor outlet waste heat recovery heat exchanger according to claim 1, wherein the medium-temperature section ND steel light pipe type heat exchange tube group (1) and the low-temperature section ND steel light pipe type heat exchange tube group (2) are directly communicated through an intermediate header.
5. 5. The ash deposition corrosion prevention device for the industrial boiler SCR reactor outlet waste heat recovery heat exchanger according to claim 1, wherein the heat exchanger water inlet mixed heat temperature regulating system (4) is used for guiding a part of hot water from a boiler water outlet pipeline to enter the heat exchanger through a pipeline.
6. 6. The ash deposition corrosion prevention device for the industrial boiler SCR reactor outlet waste heat recovery heat exchanger according to claim 5, wherein the heat exchanger water inlet mixed heat temperature adjustment system (4) consists of a connecting pipeline and an adjusting valve between a boiler water outlet main pipe and a heat exchanger water inlet pipeline.

Description

Device for preventing dust accumulation and corrosion of waste heat recovery heat exchanger at outlet of SCR reactor of industrial boiler Technical Field The utility model relates to the technical field of boiler flue gas denitration, in particular to an ash deposition corrosion prevention device for an industrial boiler SCR reactor outlet waste heat recovery heat exchanger. Background In the SCR denitration implementation process, the following problems exist in the prior art of an outlet waste heat recovery heat exchanger: the existing full-light pipe heat exchanger has no intensified heat transfer function, has the advantages of large number of pipe rows, large volume, large occupied space, limited outlet space of an industrial boiler SCR reactor and difficult arrangement. The steel consumption is large and the cost is high. The water inlet mixed heating temperature regulating system is not needed, the wall temperature of the low-temperature Duan Huanre pipe is low, and the accumulated ash is easy to corrode. After being corroded at low temperature Duan Ji, ash removal and maintenance are difficult. After low temperature Duan Ji ash corrosion, single heat exchange tube leaks, and when emergency treatment, one row of heat exchange tube needs to be blindly plugged, and the heat exchange area loss is large and the damaged pipeline is difficult to replace. The existing full-fin heat exchanger has no water inlet mixed heat temperature regulating system, and the low temperature Duan Ji is easy to be corroded by accumulated ash due to a fin type heat exchange structure. After being corroded at low temperature Duan Ji, ash removal and maintenance are difficult. When the low-temperature Duan Shangen heat exchange pipes are subjected to dust accumulation, corrosion and water leakage, one row of heat exchange pipes need to be blindly blocked during emergency treatment, the heat exchange area loss is large, and the damaged pipeline is difficult to replace. The temperature of the inlet water of the heat exchanger is 45-50 ℃, so that the wall temperature of the low-temperature section of the waste heat recovery heat exchanger is lower than the dew point of the boiler flue gas water. The low temperature section is seriously dust-accumulated and rapidly corroded due to water dew and acid dew. After being corroded at low temperature Duan Ji, ash removal and maintenance are difficult. Disclosure of utility model In order to overcome the defect of easy ash deposition and corrosion in the prior art, the utility model provides an ash deposition and corrosion prevention device for an industrial boiler SCR reactor outlet waste heat recovery heat exchanger, which has the characteristics of sulfuric acid corrosion resistance, heat exchange tube wall temperature higher than a flue gas water dew point, strong ash removal capability of a shock wave ash remover and difficult ash deposition. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: The device comprises a medium-temperature section ND steel light pipe type heat exchange tube group 1, a low-temperature section ND steel light pipe type heat exchange tube group 2, a shock wave soot blower 3 and a heat exchanger water inlet mixed heat temperature regulating system 4; The medium-temperature section ND steel-light tube type heat exchange tube group 1 is arranged at the upper part of the low-temperature section ND steel-light tube type heat exchange tube group 2, the shock wave soot blower 3 is positioned at the position 300-450mm of the uppermost row tube of the low-temperature section ND steel-light tube type heat exchange tube group 2, and is arranged in front of the water inlet of the low-temperature section ND steel-light tube type heat exchange tube group 2. The heat exchanger water inlet mixed heating temperature regulating system 4 is connected to a water inlet pipeline of the low-temperature section ND steel-light tube type heat exchange tube group 2. The heat exchanger water inlet mixed heating temperature regulating system 4 is led out from a boiler water outlet main pipe by a pipeline and is connected to a heat exchanger water inlet pipeline, so that the water inlet temperature of the low-temperature section ND steel light pipe type heat exchange pipe group 2 is improved, acid dew is prevented from being generated, and the service life of the heat exchanger is prolonged. The medium-temperature section ND steel light pipe type heat exchange tube group 1 and the low-temperature section ND steel light pipe type heat exchange tube group 2 are of light pipe type structures. The medium-temperature section ND steel light pipe type heat exchange tube group 1 is provided with 25 layers, and the low-temperature section ND steel light pipe type heat exchange tube group 2 is provided with 5 layers. The medium-temperature section ND steel light pipe type heat exchange tube group 1 is arranged in a serpentine shape, and the low-tem