CN101550359A

CN101550359A - On-line valve pressurization method by steam

Info

Publication number: CN101550359A
Application number: CNA2009101338584A
Authority: CN
Inventors: 蒋远华; 杨晓勤; 高健; 何涛; 卞平官; 古永红; 卢光胜
Original assignee: YIHUA GROUP CO Ltd HUBEI PROV; YIHUA CHEMICAL CO Ltd HUBEI
Current assignee: YIHUA GROUP CO Ltd HUBEI PROV; YIHUA CHEMICAL CO Ltd HUBEI
Priority date: 2008-12-30
Filing date: 2009-03-30
Publication date: 2009-10-07
Anticipated expiration: 2029-03-30
Also published as: CN101550359B

Abstract

The invention discloses an on-line valve pressurization method by steam, comprising: a first blowing stage: a blowing valve and a pressed steam valve are opened, an up-blowing nitrogen adding valve, a steam main valve and a downstream gas valve are closed, internal cavities of the blowing valve and the up-blowing nitrogen adding valve has no steam injection, the internal cavity of the downstream gas valve has steam injection, interior of the downstream gas valve forms a high pressure steam cavity; a down-blowing stage: the blowing valve, the pressed steam valve, the up-blowing nitrogen adding valve, and the up-blowing steam valve are closed, the steam main valve and the down-blowing steam valve are opened, the internal cavity of the downstream gas valve has no steam injection, and the internal cavities of the blowing valve and the up-blowing nitrogen adding valve has steam injection, and interior of the blowing and the up-blowing nitrogen adding valve form a high pressure steam cavity, and the passage that on-line low-pressure air enters low pressure gas flowing pipeline is cu off by the pressure cavity, thereby effectively resolving problem of leakage of hydraulic control valve and high O2 content in gas, and prolonging service life of the valve in coal gasification flow path.

Description

Method with the online pressure seal valve of steam

Technical field

The present invention relates to a kind of method of pressure seal valve, particularly a kind of method of in intermittent gasification of fixed layer, using the online pressure seal valve of steam.

Background technology

At present, the hydrostatic control valve that the intermittent gasification of fixed layer stove uses all adopts the mode of soft seal and hard sealing to strengthen the valve seal effect, but such method still can't solve the leakage problem that is caused by soft seal or hard seal failure, application number 200420117840.8 discloses a kind of pressurising auxiliary seal valve, comprise valve rod, valve body and spool, spool is positioned at the valve body that is mated, it is characterized in that valve body is provided with the through hole that penetrates valve body wall, through hole connects penstock outward, through hole communicates with cavity between spool and valve body, and the other end of penstock is provided with controlling organization.This utility model carries clean fluid as sealing medium by adopting penstock to the space of valve body and valve core chamber, has solved valve because of the leakage shortcoming of reduction of service life, but O in the descending coal gas in coal gasifying process ₂The problem of too high levels still has to be solved.

Summary of the invention

The purpose of this invention is to provide a kind of method, can solve O in leakage of hydrostatic control valve and the coal gas with the online pressure seal valve of steam ₂The problem of too high levels.

The object of the present invention is achieved like this: a kind of method with the online pressure seal valve of steam,

1), the cavity in steam under pressure valve and the descending gas valve is communicated with, the steam main valve is communicated with following steam blowing valve, following steam blowing valve and on blow nitrogen-adding valve and be communicated with, the steam main valve with on blow the interior cavity of nitrogen-adding valve and blowing valve and be communicated with, on blow nitrogen-adding valve and be communicated with the blowing valve, the valve of drying is communicated with descending gas valve;

2), the blowing stage, blowing valve, steam under pressure opening of valves, on blow nitrogen-adding valve, steam main valve and descending gas valve and close, the blowing valve and on blow in the cavity of nitrogen-adding valve and do not have high pressure steam, in the cavity of descending gas valve high pressure steam is arranged;

3), blow the gas stage down, blowing valve, steam under pressure valve and on blow nitrogen-adding valve and close, steam main valve and following steam blowing opening of valves, the blowing valve and on blow in the cavity of nitrogen-adding valve high pressure steam arranged, descending gas valve internal cavities does not have the steam injection.

Described method with the online pressure seal valve of steam, described online steam pressurized pipeline is connected with double disc valve internal cavity by the access plate of double disc valve.

The method of the online pressure seal valve of steam provided by the invention, the blowing stage: blowing valve, steam under pressure opening of valves, on blow nitrogen-adding valve, steam main valve, descending gas valve and close, the blowing valve, on blow the nitrogen-adding valve internal cavities and do not have steam to inject, descending gas valve internal cavities has steam to inject, the inner vapor pressure chamber that forms a high pressure of descending gas valve; Under blow the gas stage: blowing valve, steam under pressure valve, on blow nitrogen-adding valve, go up the steam blowing valve and close, steam main valve, following steam blowing opening of valves, descending gas valve internal cavities does not have steam to inject, the blowing valve, on blow the nitrogen-adding valve internal cavities and have steam to inject, the blowing valve, on blow the inner vapor pressure chamber that forms a high pressure of nitrogen-adding valve, cut off the passage that online low-pressure air enters the low-pressure gas flowline by pressure chamber, effectively solve O in leakage of hydrostatic control valve and the coal gas ₂The problem of too high levels, and prolong work-ing life of valve in the gasification flow process.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is a process flow sheet of the present invention.

Embodiment

As shown in Figure 1, the online steam pressurized route of pipe line on the air door is: steam main valve 2----blowing valve 5, on blow nitrogen-adding valve 4; The online steam pressurized route of pipe line on the descending gas valve 6 is: steam manifold--the descending gas valve 6 of-steam under pressure valve 3---.

Online steam pressurized pipeline is connected with the valve internal cavity by the access plate of double disc valve.

The blowing stage: blowing valve 5, steam under pressure valve 3 are opened, on blow nitrogen-adding valve 4, steam main valve 2, descending gas valve 6 and close, blowing valve 5, on blow nitrogen-adding valve 4 internal cavities and do not have steam to inject, descending gas valve 6 internal cavities have steam to inject, the descending gas valve 6 inner vapor pressure chambeies that form a high pressure; Under blow the gas stage: blowing valve 5, steam under pressure valve 3, on blow nitrogen-adding valve 4 and close, steam main valve 2, steam blowing valve 1 unlatching down, descending gas valve 6 internal cavities do not have steam to inject, blowing valve 5, following nitrogen-adding valve 4 internal cavities have steam to inject, blowing valve 5, on blow the inner vapor pressure chambeies that form a high pressure of nitrogen-adding valve 4, cut off the passage that online low-pressure air enters the low-pressure gas flowline by pressure chamber, solve O in leakage of hydrostatic control valve and the coal gas ₂The problem of too high levels.

Claims

1, a kind of method with the online pressure seal valve of steam is characterized in that:

1) cavity in steam under pressure valve (3) and the descending gas valve (6) is communicated with, steam main valve (2) is communicated with following steam blowing valve (1), following steam blowing valve (1) and on blow nitrogen-adding valve (4) and be communicated with, steam main valve (2) with on the cavity that blows in nitrogen-adding valve (4) and blowing valve (5) be communicated with, on blow nitrogen-adding valve (4) and be communicated with blowing valve (5), the valve (5) of drying is communicated with descending gas valve (6);

2) the blowing stage, blowing valve (5), steam under pressure valve (3) are opened, on blow nitrogen-adding valve (4), steam main valve (2) and descending gas valve (6) and close, blowing valve (5) and on blow in the cavity of nitrogen-adding valve (4) and do not have high pressure steam, in the cavity of descending gas valve (6) high pressure steam is arranged;

3) blow the gas stage down, blowing valve (5), steam under pressure valve (3) and on blow nitrogen-adding valve (4) and close, steam main valve (2) and following steam blowing valve (1) are opened, blowing valve (5) and on blow in the cavity of nitrogen-adding valve (4) high pressure steam arranged, descending gas valve (6) internal cavities does not have the steam injection.

2, the method with the online pressure seal valve of steam according to claim 1, it is characterized in that: described online steam pressurized pipeline is connected with double disc valve internal cavity by the access plate of double disc valve.