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System and method for high-temperature coal gas sensible heat recovery and utilization

A high temperature and gas technology, applied in the field of high temperature gas sensible heat recovery and reuse, can solve problems such as damage to equipment and property, loss of life, explosion, etc., to ensure safety, improve energy utilization, and avoid deflagration or even explosion.

Pending Publication Date: 2017-03-15
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, gas, especially high-temperature gas, is flammable and explosive. If it comes into direct contact with the gasification agent during the heat exchange process, it will undergo a violent combustion reaction with the oxygen contained in it, resulting in a deflagration or even an explosion accident. In severe cases, it will damage the equipment. Even cause major property and even loss of life accidents

Method used

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  • System and method for high-temperature coal gas sensible heat recovery and utilization
  • System and method for high-temperature coal gas sensible heat recovery and utilization
  • System and method for high-temperature coal gas sensible heat recovery and utilization

Examples

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Effect test

Embodiment 1

[0078] Using low-temperature saturated steam as the low-temperature medium and low-temperature air as the low-temperature gasification agent, the 20000Nm 3 / h, 800°C high-temperature gas is cooled to low-temperature gas not higher than 200°C and its sensible heat is recycled as a specific example to illustrate the patent of the invention in detail.

[0079] Such as figure 2 As shown, the 20000Nm discharged from the gasifier 1 3 / h, 800°C high-temperature gas is passed into the first channel of the first heat exchange device, and at the same time, 600kg / h is passed into the second channel of the second heat exchange device. The steam with a lower temperature of 133°C generated by the thermal device is used as a low-temperature medium, and the high-temperature gas is cooled by the low-temperature saturated steam to become a medium-temperature gas at 298°C, and at the same time, the temperature of the low-temperature saturated steam rises from 133°C to 453°C to become a high-te...

Embodiment 2

[0082] With liquid water as the low-temperature medium and low-temperature air as the low-temperature gasification agent, the 20000Nm 3 / h, 800°C high-temperature gas is cooled to low-temperature gas not higher than 200°C and its sensible heat is recycled as a specific example to illustrate the patent of the invention in detail.

[0083] Such as image 3 As shown, the 20000Nm discharged from the gasifier 3 / h, 800°C high-temperature gas is passed into the first passage in the first heat exchange device, and at the same time, 410kg / h, 25°C liquid water is passed into the second passage in the first heat exchange device as a low-temperature medium, The high-temperature gas in the first channel is cooled by the liquid water in the second channel to become a medium-temperature gas at 298°C, and at the same time, the liquid water becomes superheated steam at 442°C. The flow rate in three channels is 13000Nm 3 / h, the low-temperature air with an initial temperature of 25°C is hea...

Embodiment 3

[0086] Using low-temperature nitrogen as the low-temperature medium and low-temperature air as the low-temperature gasification agent, the 20000Nm 3 / h, 800°C high-temperature gas is cooled to low-temperature gas not higher than 200°C and its sensible heat is recycled as a specific example to illustrate the patent of the invention in detail.

[0087] Such as Figure 4 As shown, the 20000Nm discharged from the gasifier 3 / h, 800°C high-temperature gas is passed into the first channel in the first heat exchange device, and at the same time, 1290Nm from the nitrogen cooling device is passed into the second channel in the second heat exchange device 3 / h, nitrogen at 80°C is used as a low-temperature medium. The high-temperature gas is cooled by nitrogen to become a medium-temperature gas at 298°C. At the same time, the temperature of the low-temperature nitrogen rises from 80°C to 750°C to become high-temperature nitrogen. The high-temperature nitrogen enters the nitrogen coolin...

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Abstract

The invention discloses a system and method for high-temperature coal gas sensible heat recovery and utilization. The system includes a gasification furnace, a first heat transfer device and a second heat transfer device, wherein the gasification furnace includes a coal feeding hole, a gasification agent inlet and a high-temperature coal gas outlet; the first heat transfer device includes a first heat transfer channel, a second heat transfer channel and a third heat transfer channel in sequence from inside to outside, the first heat transfer channel is provided with a high-temperature coal gas inlet and a middle-temperature coal gas outlet, the second heat transfer channel is provided with a low-temperature medium inlet and a high-temperature medium outlet, the third heat transfer channel is provided with a low-temperature gasification agent inlet and a high-temperature gasification agent outlet, and the high-temperature gasification agent outlet is connected with the gasification agent inlet; the second heat transfer device includes a middle-temperature coal gas inlet, a low-temperature coal gas outlet, a low-temperature water inlet and a steam outlet, and the middle-temperature coal gas inlet is connected with the middle-temperature coal gas outlet. The system can effectively recover residual heat in high temperature coal gas, direct contact does not occur under the condition of equipment abrasion and leakage, deflagration phenomena and even bursting phenomena are avoided, and the safety of production is ensured.

Description

technical field [0001] The invention belongs to the field of recovery and reuse of sensible heat, in particular, the invention relates to a system and method for recovery and reuse of sensible heat of high-temperature gas. Background technique [0002] In the process of using solid fuels such as coal, biomass, and garbage to produce gas, the high-temperature gas generated is very high, generally around 800-900°C, and must be cooled to perform follow-up treatment such as dust removal to meet gas usage standards. Coal gas contains a large amount of energy and high sensible heat. If the sensible heat can be used to preheat the gasification agent and re-participate in the gasification reaction, the gas production rate and the energy and resource conversion efficiency of the coal gasification process will be greatly improved. Therefore, using a gasification agent to cool the high-temperature gas and recover its sensible heat has very important significance for energy saving and e...

Claims

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Application Information

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IPC IPC(8): C10J3/00C10J3/72C10J3/82F28D7/10F22B1/18
CPCC10J3/00C10J3/72C10J3/82C10J2300/093C10J2300/0956C10J2300/0976C10J2300/16C10J2300/1807F22B1/18F28D7/10Y02P20/10
Inventor 刘周恩史雪君吴黎阳余海鹏苏二强孙宝林黄伟史东军吴道洪
Owner SHENWU TECH GRP CO LTD