Low-pressure heat exchanger for two-section dry coal powder gasification furnace

Abstract

The invention discloses a low-pressure heat exchanger for a two-section dry coal powder gasification furnace. The low-pressure heat exchanger comprises a shell and a heat exchange pipeline, a water inlet pipe is arranged at the top of the shell, the water inlet pipe is embedded into the shell, and is in communication with the shell, the bottom of the water inlet pipe is connected with a dischargepipe, a plurality of spray heads which are arranged symmetrically are arranged on the side surface of the discharge pipe, a steam outlet is formed in the adjacent side of the water inlet pipe, the steam outlet is in communication with the shell, the heat exchange pipeline is arranged at the bottom of the discharge pipe, the end parts of the heat exchange pipeline are provided with a synthesis gasinlet and a synthesis gas outlet respectively, symmetric supporting legs are arranged at the bottom of the shell, and the supporting legs are welded and fixed to the shell. The low-pressure heat exchanger has the advantages that the water supply temperature of a boiler is improved, the water inlet mode of the boiler water supply is changed, the phenomenon that local supercooling forms ammonia saltcrystallization is avoided, so that the problem of heat exchange pipe leakage caused by heat exchange pipe blockage and ammonia salt corrosion on the heat exchange pipe is solved.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a low-pressure heat exchanger for a second-stage dry coal pulverized gasifier. Background technique [0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial productions. Heaters can be used as heaters, coolers, condensers, evaporators and reboilers, etc., and are widely used. In the field of coal chemical industry, pulverized coal gasification furnace is required for coal gasification, and heat exchanger is an indispensable part of gasification furnace. [0003] However, after analysis, it was found that the existing low-pressure heat exchangers used in the second-stage dry coal gasifier have the following deficiencies; Leakage to the water vapor side. Contents of the invention [0004] There...

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Problems solved by technology

[0004] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a low-pressure heat exchanger for the second-stage dry pulverized coal gasifier, which can increase the boiler feed water temperature, change the boiler feed water inlet mode, and avoid local overcooling to form ammonia salt crystallization , which solves the advantages of heat exchange tube blockage and ammonia salt corrosion of heat exchange tubes leading to heat exchange tube leakage

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