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Air preheater

An air preheater and air inlet technology, which is applied to heat exchanger shells, heat exchange equipment, direct heating and dry distillation, etc., can solve the problems of few baffles, uniform distribution of air, and tube sheet failure.

Pending Publication Date: 2021-11-02
DORIGHT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the flow ratio of air and gas in the coal-to-gas process, the design of the air preheater is short and thick, and the number of baffles is small. The air cannot be evenly distributed in the shell side, forming a flow dead zone. When the equipment is working Under severe temperature difference thermal stress, especially the tube sheet, the air forms a flow dead zone in the area opposite to the inlet. This uneven flow distribution leads to uneven heating of the tube sheet, resulting in severe temperature difference thermal stress, and the tube sheet fails in a short time

Method used

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  • Air preheater

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Embodiment Construction

[0008] figure 1 A schematic diagram of the invention is shown. An air preheater of the present invention comprises a heat exchange tube, a baffle plate, a shell, a hot-side tube plate, a cold-side tube plate, an expander, a smoke box one, a smoke box two, an air inlet, an air outlet, and a splitter plate , Bypass pipe, the hot side tube plate is composed of tube plate one, tube plate two, sleeve tube, cooling air inlet pipe, and cooling air outlet pipe. The specific implementation method is as follows:

[0009] A plurality of heat exchange tubes 1 pass through the baffles 2 arranged in a staggered manner according to a certain arrangement rule, and the tube bundle composed of the heat exchange tubes 1 and the baffles 2 is placed in a cylindrical shell 3, and one end of the shell 3 is provided with The hot side tube plate 4 and the cold side tube plate 5 are arranged at the other end. Both tube plates have tube holes corresponding to the position and number of heat exchange tu...

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Abstract

The invention discloses an air preheater, and particularly relates to an air preheater which is used for heating air to more than 500 DEG C in a coal-to-gas process. Tube plates on the two sides of the air preheater both have effective measures for cooling and uniformly flowing the air, so that the air is uniformly distributed in a shell pass, especially at the tube plates, uniform and effective cooling is provided for the tube plates, and the failure caused by serious temperature difference thermal stress is avoided.

Description

technical field [0001] The invention relates to an air preheater, in particular to an air preheater for heating the air temperature to above 500 DEG C for the coal-to-gas process. Background technique [0002] Coal-to-gas is a process in which coal is heated to a certain temperature in the absence of oxygen and then converted into gas and other by-products. The heat for heating coal is provided by burning a part of coal. The temperature of the gas generated after the reaction in the reaction furnace is very high and carries a large amount of heat energy, while the finished gas needs to be kept at about normal temperature. Therefore, a lot of heat energy recovery equipment is designed in the process, which can not only recover heat energy but also reduce the temperature of the gas to the required level. temperature. The air preheater is one of the heat energy recovery equipment in the process. Its function is to heat the air used for coal combustion in the reaction furnace. ...

Claims

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Application Information

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IPC IPC(8): F23L15/00F28F9/22C10B49/02C10B57/00
CPCF23L15/00F28F9/22C10B49/02C10B57/00F28F2009/222Y02E20/34Y02P20/129
Inventor 金延超
Owner DORIGHT