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A system and method for recovering excess pressure energy in a coal gasification black water treatment system

A treatment system and recovery system technology, applied in the field of energy recovery or energy conversion, can solve problems such as the influence of system operation stability, difficulty in turbine structure design, and impact on turbine operation, so as to improve the operation status and energy recovery level , The effect of reducing equipment loss

Active Publication Date: 2019-01-08
BEIJING AEROSPACE PROPULSION INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the high temperature, non-condensable gas, and solid particles of the black water medium cause difficulties in the design of the turbine structure. At the same time, the non-condensable gas is precipitated during the flow of the turbine during depressurization, and the high-temperature water may flash under the local low-pressure flow conditions in the turbine. , The energy matching state of the system has an impact on the operation of the turbine, and the black water pressure and flow control have an impact on the stability of the system operation

Method used

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  • A system and method for recovering excess pressure energy in a coal gasification black water treatment system

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Effect test

Embodiment 1

[0026] like figure 1 As shown, a residual pressure energy recovery system for a coal gasification black water treatment system according to the present invention includes a gasification furnace 1, a slag breaker 2, a flow regulating valve 3, a hydraulic turbine 4, and a pressure regulating valve-5 , High-pressure flash tank 6, oxygen removal tank 7, pressure regulating valve 2 8, heat exchanger 9, washing tower 10, ejector 11, quenching water pump 12, washing tower feed pump 13, load equipment 14.

[0027] The lower black water outlet of the gasification furnace 1 is connected to the inlet of the high-pressure flash tank 6 through two parallel pipelines, one of which is provided with flow regulating valve 3, hydraulic turbine 4, and pressure regulating valve 1 in sequence, and the other pipeline is Set the pressure regulating valve 2 8; the hydraulic turbine 4 is connected to the load equipment 14; it divides the black water energy into two parts, the residual pressure energy ...

Embodiment 2

[0041] like figure 1Shown, a kind of coal gasification black water treatment system of the present invention uses residual pressure energy recovery method, in the method, oxygen, pulverized coal or coal-water slurry are burned in gasification furnace 1 to form crude gas;

[0042] The black water coming out from the lower part of the gasification furnace 1 enters the hydraulic turbine 4 after the flow is adjusted by the flow regulating valve 3, and the residual pressure energy is recovered through the hydraulic turbine 4, thereby driving the load equipment 14; the black water coming out of the hydraulic turbine 4 The water enters the high-pressure flash tank 6 after the pressure is adjusted by the pressure regulating valve 1, and the heat energy is recovered by flash vaporization in the high-pressure flash tank 6; Two 8 spare pipelines.

[0043] The pressure of the gasification furnace 1 is P 1 , the saturation pressure of water is P 2 , the residual pressure energy P recove...

Embodiment 3

[0045] like figure 1 Shown, a kind of coal gasification black water treatment system residual pressure energy recovery method of the present invention, this method comprises the steps:

[0046] (a) Oxygen and pulverized coal enter the gasification furnace 1 and burn to form crude gas, and the crude gas enters the washing tower 10 through the ejector 11;

[0047] (b) The black water coming out of the lower part of the gasification furnace 1 enters the high-pressure flash tank 6 after passing through the flow regulating valve 3, the hydraulic turbine 4, and the pressure regulating valve-5, and part of the water forms low-pressure steam and simultaneously precipitates non-condensable gas; The power turbine recovers residual pressure energy to drive the load equipment 14; the load equipment 14 is a generator or a pump or other rotating equipment.

[0048] (c) the steam containing non-condensable gas from the high-pressure flash tank 6 enters the heat exchanger 9 for heating the w...

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Abstract

The invention provides a residual pressure energy recovery system and method for a coal gasification black water treatment system.A black water outlet on the lower portion of a gasification furnace is connected with an inlet of a high-pressure flashing tank through two pipelines which are in parallel connection, a flow adjusting valve, a hydraulic turbine and a first pressure adjusting valve are sequentially arranged on one of the pipelines, a second pressure adjusting valve is arranged on the other one pipeline, and the hydraulic turbine is connected with loading equipment.Black water energy is divided into residual pressure energy higher than saturation pressure of water and heat energy, the heat energy is recovered by the high-pressure flashing tank through flashing gasification, and the residual pressure energy is recovered by the hydraulic turbine.By using the residual pressure energy recovery system and method, energy recovery level of the coal gasification wet-process dedusting black water treatment system is improved, device energy consumption is lowered, and improving of running state of the pressure adjusting valves (also known as flashing valves) and lowering of equipment loss are facilitated.

Description

technical field [0001] The invention belongs to the field of energy recovery or energy conversion, in particular to a residual pressure energy recovery system and method for a coal gasification black water treatment system, which is suitable for the recovery of pressure energy in the wet dust removal process system of a coal gasification device, and the recovered energy can be used For driving pumps or generators and other rotating equipment. Background technique [0002] Coal gasification is the core technology for clean coal utilization. Whether it is pulverized coal pressurized gasification, coal-water slurry pressurized gasification or other gasification processes, the crude gas produced must be dedusted and purified. Among them, wet dedusting is the process of coal gasification. One of the most widely used dust removal methods. Wet dust removal has the characteristics of stable operation and low equipment cost. Although the heat of black water is fully recovered throu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10J3/48F01D15/08F01D15/10C10K1/10
CPCC10J3/485C10J2300/0933C10J2300/0959C10J2300/1615C10K1/101F01D15/08F01D15/10Y02P20/10
Inventor 吴玉珍赵钊张彦军丛建华冉治通郝开元张春雷于槟恺于继胜曹耀
Owner BEIJING AEROSPACE PROPULSION INST