Sensible heat recovery device with ash capture for preventing slag bonding and staining

A sensible heat recovery and anti-slagging technology, which is applied in steam condensation, lighting and heating equipment, combustion methods, etc., can solve the problems of reducing overall efficiency, reducing the energy quality of syngas, and improving system operating costs, so as to improve heat transfer The effect of low effect, ash melting point and sodium potassium salt content, wide applicability

Active Publication Date: 2014-12-24
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Shell gasification technology is safe to operate, but the chilling process will greatly reduce the energy quality of the syngas, reduce the overall efficiency, and increase the operating cost of the system

Method used

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  • Sensible heat recovery device with ash capture for preventing slag bonding and staining
  • Sensible heat recovery device with ash capture for preventing slag bonding and staining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A dry powder gasifier with a daily processing capacity of 3,000 tons of coal has a gasification pressure of 4.0 MPa, the temperature at the inlet of the slagging chamber after gasification of the syngas is 1300°C, and the total gas flow out of the gasification chamber is 26,706 Nm3 / h. The inner diameter of the slag collection chamber is 3.6m, and the inner diameter of the slag catcher 3 is 2.5m. The slag catcher is made of high-temperature resistant alloy steel with a heat-resistant coating material on the surface. The guide chamber 7, the radiation heating surface 8 adopts a three-layer membrane water-cooled wall structure, the gas outlet temperature is 780°C, and the gas temperature after cooling by the quenching section 10 is 530°C, and the convection heating surface 14 adopts a membrane-type coil water-cooled wall structure, Gas outlet 260°C. The coal quality analysis is shown in the table below:

[0038] name

Embodiment 2

[0040] A dry powder gasifier with a daily processing capacity of 3,000 tons of coal has a gasification pressure of 4.0 MPa, the inlet temperature of the slagging chamber after gasification of the syngas is 1400°C, and the total amount of gasification of the syngas is 27,402 Nm3 / h. The inner diameter of the slag collection chamber is 3.7m, and the inner diameter of the slag catcher 3 is 2.5m. The slag catcher is made of high-temperature resistant alloy steel with a heat-resistant coating material on the surface. The guide chamber 7, the radiation heating surface 8 adopts a single-layer membrane water wall structure, the gas outlet temperature is 730°C, the chilling section does not use chilling gas, and directly enters the convection heating surface 14, and the convection heating surface 14 adopts membrane coil water cooling Wall structure, gas outlet 260°C.

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Abstract

The invention provides a sensible heat recovery device with ash capture for preventing slag bonding and staining, which comprises a heat recovery unit. The heat recovery unit comprises a housing, and a high-temperature section radiation heat exchange unit and a low-temperature section convection heat exchange unit are sequentially arranged in the housing along an airstream direction of high-temperature gas. The sensible heat recovery device is characterized by also comprising a slag collecting chamber for effectively capturing fused slag in high-temperature gas; the slag collecting chamber is connected with an air inlet arranged on the housing through a transition section; and a chilling section is arranged between the high-temperature section radiation heat exchange unit and the low-temperature section convection heat exchange unit, and the chilling section cools the gas entering the low-temperature section convection heat exchange unit, so that gaseous alkali metal contained in the gas can not be condensed in the low-temperature section convection heat exchange unit. The sensible heat recovery device capable of effectively preventing a heated surface from being slagged and stained disclosed by the invention is particularly suitable for recovery of high-temperature ash gas generated after combustion or gasification of easily-stained or slagged coal.

Description

technical field [0001] The invention relates to a device for recovering sensible heat from high-temperature ash-containing gas generated after gasification or combustion of carbon-containing fuel. Background technique [0002] Integrated Coal Gasification Combined Cycle (English full name: Integrated Coal Gasification Combined Cycle, hereinafter referred to as IGCC) is one of the cutting-edge technologies for global clean energy utilization. Compared with ordinary coal-fired power generation technology, its advantage is that it can use coal more efficiently. resources, and greatly reduce the emission of combustion pollutants. In the IGCC system, the energy recovery device is an essential equipment. Compared with the chilling process, the sensible heat recovery device can greatly improve the system efficiency, and can recover energy equivalent to 15-25% of the low calorific value of raw coal, so that the hot gas efficiency can reach 90-95%, and the net efficiency of IGCC can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D5/00F23M5/06
CPCY02P70/10
Inventor 葛学利乌晓江马胜倪建军刘煜李平张艳伟
Owner SHANGHAI BOILER WORKS
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