CN-224215859-U - Industrial boiler SCR reactor outlet waste heat recovery heat exchanger

Abstract

The waste heat recovery heat exchanger at the outlet of the SCR reactor of the industrial boiler comprises a water outlet header and a water inlet header, wherein a high-temperature section double-H fin type heat exchange tube group, a medium-temperature Duan Guangguan type heat exchange tube group, a middle header and a low-temperature Duan Guangguan type heat exchange tube group are sequentially communicated between the water outlet header and the water inlet header, the water outlet header is arranged at the topmost end of the heat exchanger, and the water inlet header is arranged at the bottommost end of the heat exchanger. The inside of the heat exchanger is sequentially divided into a high-temperature flue gas area, a medium-temperature flue gas area and a low-temperature flue gas area from top to bottom, the high-temperature section double-H-fin type heat exchange tube set is arranged in the high-temperature flue gas area, the medium-temperature Duan Guangguan type heat exchange tube set is arranged in the medium-temperature flue gas area, the low-temperature Duan Guangguan type heat exchange tube set is arranged in the low-temperature flue gas area, and an intermediate header is arranged at the outlet of the low-temperature Duan Guangguan type heat exchange tube set. The utility model has the characteristics of moderate volume of the heat exchanger, convenient maintenance and dust removal in structure and convenient maintenance and replacement of the low-temperature section corrosion damaged pipeline.

Inventors

• NIU YANQING
• CAO JIANZHONG
• JIANG KUN
• YU GENG
• CAO JUNMIN
• LIU YUANWU
• ZHAO XIAOMIN
• YU WUSHENG
• ZHAO JINMEI

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 industrial boiler SCR reactor outlet waste heat recovery heat exchanger is characterized by comprising a water outlet header (1) and a water inlet header (6), wherein a high-temperature section double-H fin type heat exchange tube group (2), a medium-temperature Duan Guangguan type heat exchange tube group (3), a middle header (4) and a low-temperature Duan Guangguan type heat exchange tube group (5) are sequentially communicated between the water outlet header (1) and the water inlet header (6); The water outlet header (1) is arranged at the topmost end of the heat exchanger, and the water inlet header (6) is arranged at the bottommost end of the heat exchanger; The interior of the heat exchanger is sequentially divided into a high-temperature smoke area, a medium-temperature smoke area and a low-temperature smoke area from top to bottom; the high-temperature section double-H-fin type heat exchange tube group (2) is arranged in a high-temperature flue gas area, the medium-temperature Duan Guangguan type heat exchange tube group (3) is arranged in a medium-temperature flue gas area, the low-temperature Duan Guangguan type heat exchange tube group (5) is arranged in a low-temperature flue gas area, and an intermediate header (4) is arranged at the outlet of the low-temperature Duan Guangguan type heat exchange tube group (5).
2. 2. The industrial boiler SCR reactor outlet waste heat recovery heat exchanger of claim 1, wherein the high temperature section double H fin type heat exchange tube group (2) is of double H fin type, the medium temperature Duan Guangguan type heat exchange tube group (3) is of a light tube type, and the low temperature Duan Guangguan type heat exchange tube group (5) is of a light tube type, and the heat exchange tube group form a cuboid type heat exchanger.
3. 3. An industrial boiler SCR reactor outlet waste heat recovery heat exchanger according to claim 1, wherein the medium temperature Duan Guangguan heat exchange tube group (3) is provided with a light tube type heat exchange tube, and the longer face of the light tube type heat exchange tube is provided with an ash removal access door (7).
4. 4. An industrial boiler SCR reactor outlet waste heat recovery heat exchanger according to claim 1, wherein the low temperature Duan Guangguan heat exchange tube group (5) is provided with a light tube type heat exchange tube, the bottom of the light tube type heat exchange tube group (5) is provided with a water inlet header (6), and the upper part is provided with an intermediate header (4).
5. 5. The industrial boiler SCR reactor outlet waste heat recovery heat exchanger of claim 1, wherein the inspection ash removal manhole (8) is arranged on the flue wall plate of the inspection ash removal space between the high temperature section double H fin type heat exchange tube group (2) and the medium temperature Duan Guangguan type heat exchange tube group (3), and the inspection ash removal manhole (8) is arranged on the wall surface of the heat exchanger along the flow direction of the flue gas between the medium temperature Duan Guangguan type heat exchange tube group (3) and the low temperature Duan Guangguan type heat exchange tube group (5).
6. 6. An industrial boiler SCR reactor outlet waste heat recovery heat exchanger according to claim 1, wherein an overhaul space is left between the high temperature section double H fin type heat exchange tube group (2) and the medium temperature Duan Guangguan type heat exchange tube group (3), between the medium temperature Duan Guangguan type heat exchange tube group (3) and the low temperature Duan Guangguan type heat exchange tube group (5), and an intermediate header (4) is arranged between the medium temperature Duan Guangguan type heat exchange tube group (3) and the low temperature Duan Guangguan type heat exchange tube group (5).

Description

Industrial boiler SCR reactor outlet waste heat recovery heat exchanger Technical Field The utility model relates to the technical field of industrial boiler flue gas denitration, in particular to an industrial boiler SCR reactor outlet waste heat recovery heat exchanger. Background The existing SCR reactor outlet waste heat recovery heat exchanger technology has the following problems: The existing full-light pipe heat exchanger has no intensified heat transfer function, large pipe row number, large volume, large occupied space, limited outlet space of the SCR reactor of the industrial boiler, difficult arrangement, large steel consumption, high cost, no water inlet mixed heat temperature regulating system and low temperature Duan Yi dust accumulation corrosion. 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 blind plug, and heat exchange area loss is big, and damaged pipeline is difficult to change. 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. After low temperature Duan Ji ash corrosion, single heat exchange tube leaks, and when emergency treatment, one row of heat exchange tube needs blind plug, and heat exchange area loss is big, and damaged pipeline is difficult to change. Disclosure of utility model In order to overcome the defects in the prior art, the utility model provides the waste heat recovery heat exchanger at the outlet of the SCR reactor of the industrial boiler, which has the characteristics of moderate volume, convenient maintenance and ash removal in structure and convenient maintenance and replacement of a low-temperature section corrosion damaged pipeline. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: The industrial boiler SCR reactor outlet waste heat recovery heat exchanger comprises a water outlet header 1 and a water inlet header 6, wherein a high-temperature section double-H fin type heat exchange tube group 2, a medium-temperature Duan Guangguan type heat exchange tube group 3, a middle header 4 and a low-temperature Duan Guangguan type heat exchange tube group 5 are sequentially communicated between the water outlet header 1 and the water inlet header 6; The water outlet header 1 is arranged at the topmost end of the heat exchanger, and the water inlet header 6 is arranged at the bottommost end of the heat exchanger. The interior of the heat exchanger is sequentially divided into a high-temperature smoke area, a medium-temperature smoke area and a low-temperature smoke area from top to bottom; The high-temperature section double-H-fin type heat exchange tube group 2 is arranged in a high-temperature smoke area, the medium-temperature Duan Guangguan type heat exchange tube group 3 is arranged in a medium-temperature smoke area, the low-temperature Duan Guangguan type heat exchange tube group 5 is arranged in a low-temperature smoke area, and the middle header 4 is arranged at the outlet of the low-temperature Duan Guangguan type heat exchange tube group 5. The high-temperature section double-H fin type heat exchange tube group 2 is of a double-H fin type, the medium-temperature Duan Guangguan type heat exchange tube group 3 is of a light tube type, and the low-temperature Duan Guangguan type heat exchange tube group 5 is of a light tube type, so that a cuboid type heat exchanger is formed. The high-temperature section double-H fin type heat exchange tube group 2, the medium-temperature Duan Guangguan type heat exchange tube group 3 and the low-temperature Duan Guangguan type heat exchange tube group 5 have the advantages of reducing the volume and reducing the steel consumption compared with a full-light tube type heat exchange tube group. The medium-temperature Duan Guangguan-layer heat exchange tube group 3 is provided with 25 layers of light tube type heat exchange tubes according to actual requirements, and the ash removal access door 7 is arranged on the longer surface of the light tube type heat exchange tubes. The low-temperature Duan Guangguan-layer light pipe type heat exchange tube is arranged on the heat exchange tube group 5 according to actual requirements, the water inlet header 6 is arranged at the bottom (inlet) of the light pipe type heat exchange tube group 5, and the middle header 4 is arranged at the upper part (outlet). An inspection ash removal manhole 8 is arranged on a flue wall plate of an inspection ash removal space between the high-temperature section double-H-fin type heat exchange tube group 2 and the medium-temperature Duan Guangguan type heat exchange