A new type of tube-panel water-tube heat exchanger integrated with electrostatic precipitator

Abstract

A novel tube panel type water tube heat exchanger integrated with an electrostatic precipitator consists of a plurality of rows of tube panels, wherein each row of tube panels consists of heat exchanger headers at two ends and a plurality of heat exchanging tube bundles which are connected with the heat exchanger headers at the two ends; tube ends of the heat exchanger heads at the two ends of each of the adjacent tube panels are connected to one another through large-diameter elbows, so that working media of the adjacent tube panels are connected to one another; and heat exchanging tube bundles of each tube panel are arranged in a flue structure in a middle section of an extension section of an inlet of the precipitator. The heat exchanger does not occupy the other effective space in front of the inlet of the electrostatic precipitator; the waste heat of the smoke can be reasonably used; and the specific resistance of the soot is reduced, so that the efficiency of the electrostatic precipitator is improved. The novel tube panel type water tube heat exchanger integrated with the electrostatic precipitator has the advantages that the structure is simple and compact, modular production and modular assembly can be realized, and field installation is quite convenient.

Description

technical field [0001] The invention relates to the technical field of waste heat utilization of coal-fired boiler flue gas, in particular to a novel tube-panel water-tube heat exchanger integrated with an electrostatic precipitator. Background technique [0002] Coal is the most important primary energy in China, and coal-fired power generation occupies the most important position in my country's power production. Therefore, improving the power generation efficiency of coal-fired units and reducing coal energy consumption is of great significance to my country's energy conservation and emission reduction. Flue gas waste heat loss is the most important item in the heat loss of coal-fired boilers, accounting for 4-8% of the input heat of large and medium-sized boilers, accounting for about 80% of the total heat loss of boilers. Generally, for every 12°C increase in the exhaust gas temperature of a coal-fired boiler, the heat loss of the exhaust gas increases by about 1%. [...

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Problems solved by technology

[0005] In the existing flue gas waste heat utilization technology, the heat exchangers are all arranged in the horizontal or vertical flue before or after the dust collector. However, in some cases, due to the limited space, the flue arrangement is extremely compact. There is no waste heat recovery device arranged in the straight section of the flue between the bell mouth of the heater and the inlet of the dust collector; sometimes although a straight section of the flue is designed, the waste heat recovery device is greatly affected by the arrangement of the denitrification reactor above the straight section of the flue. restrictions, especially not conducive to the transformation of existing power plants, in view of this, we propose a new type of tube-panel water-tube heat exchanger integrated with electrostatic precipitator

[0006] Most of the existing flue gas waste heat utilization technologies use water-tube heat exchangers. The heat exchangers are all serpentine tube bundle structures connected by a large number of 180-degree elbows. Not only is the structure of the heat exchanger complex, but also A large number of 180 degrees occupy a huge space

In the existing flue gas waste heat utilization technology, there are also heat pipe heat exchangers, but compared with water pipe heat exchangers, the metal consumption of heat pipe heat exchangers in the evaporation heat absorption section is equivalent, but the condensation heat release section is added, resulting in The structure is complex, the volume is huge, and the cost is high. Moreover, once the working liquid in the heat exchange tube of the heat pipe heat exchanger is filled, the metal wall temperature will not change, and it cannot be adjusted according to the change of the coal type of the boiler, so it is difficult to adapt The variety of coal in domestic coal-fired power plants leads to frequent changes in the acid dew point of flue gas

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