DD271707A1 - METHOD FOR THE HYDROMECHANICAL DEBASTION OF PRESSURE GAS GENERATORS - Google Patents

Abstract

The invention relates to the gasification of spiky or dusty coal. The essence of the invention is that the ash sluice is relaxed until the pressure equalization between ash sluice and flood room in the flood area and then the ash using the existing pressure in the flood room via a pipeline system is hydraulically fed to the ash tank. The advantages of the new solution are that the energy required for ash removal is reduced, the environment is less polluted and the wear on vulnerable assemblies is significantly reduced.

Description

For this 1 page drawing

Field of application of the invention

The invention relates to a method for the hydromechanical deashing of compressed gas generators for gasification of particulate or pulverulent coal under pressure, in particular in the oxygen pressure, wherein the application is carried out in pressurized gas plants for the production of town gas or synthesis gas.

Characteristic of the known state of the art

The pressure gas generators are dehumidified according to DD-PS110511 above the assemblies rotating grate, pressure housing, ash sluice, Aschefallechacht, quenching channel with scraper belt, slag crusher and nozzle tube. The ash and slag is thereby fed through the rotary grate into the ash sluice above the ash sluice shaft and the scratch slat to the slag crusher. After crushing the slag, the ash slag mixture is transported to the landfill in an open flushing channel.

In addition to deflagration in the ash pit by gasification and access of atmospheric oxygen, it came mainly to frequent disruption of the system by caking in the open flush gutter and high wear on the machine elements, such. As the scraper chain, the Aschebreipumpen, the lock closure and the relaxation organs.

Based on these disadvantages, there have been a large number of technical solutions for printing ashes in the past, for example according to DD-PS 210296.210297.210298.210704.210925.210926.210927.210928.

These technical solutions also have shortcomings that impede an effective high-performance operation of the corresponding systems.

The disadvantages are in the control of coarse slag up to a grain size of 200mm and in the wet ash sluice.

Penetration of raw gas into the ash sluice is still not excluded, caking is still possible and the entire ash removal process is confusing.

According to DD-PS 245441, the ash sluice is released to a system pressure of the flood space (preferably 1 MPa) for hydromechanical deashing and then the ash sluice is emptied into the flood space.

The disadvantage of this method lies in the environmental impact when relaxing the ash sluice and in the energy consumption while maintaining the system pressure in the flood area during removal of the ash.

Object of the invention

The aim of the invention is to achieve a substantial improvement of the environmental conditions and to reduce the energy consumption for the removal of the ash.

Next, the wear of vulnerable assemblies, such as the closure organs for relaxing and emptying the ash sluice to be reduced.

-2- 271707 Presentation of the Essence of the Invention

The object of the invention is to stabilize the labile mode of operation of the ash removal system and to make the operation of the ash discharge manageable.

According to the invention, the object is achieved in that the relaxation of the ash sluice takes place within a system ash sluice / flood space and the released energy is used for the Ascheabiranspori in the pipe to Aschespülraum.

During the relaxation of the ash sluice, the ash is removed from the previous ash cycle. The ash sluice is to relax in the flood area, which is located below this. The pressure present in the flood area is used for the hydraulic transport of the asphalt via a pipeline system to the ash rinsing room. The liquid level in the flood area is preferably filled in the range «), ι of the minimum pressure in order to save energy of the desserts of the flood space. Furthermore, the object is achieved in that is minimized by targeted switching dependency of the wear of fittings. During the switching process of the valves and the associated high flow rate, the valve in the ash transport line is supplied with clean water by the predetermined dependency.

exemplary

The invention will be explained below with reference to an exemplary embodiment by means of a drawing:

As shown in the drawing, the ash-slag mixture falls over the upper ash vein. / Conclusion 1 in the under gasification pressure lock 2.

After closing the upper ash sluice closure 1 at Max-Stand ash in the lock, the Aescheschleuse 2, which is covered with gasification pressure, is expanded into the flood space 4 via an expansion valve 3. The flood chamber 4 is at the beginning of the relaxation is ash sluice 2 under a dependent of the pressure of ash ashes minimum pressure.

After reaching pressure equalization between the ash sluice 2 and the flood chamber 4, the lower ash sluice closure β is opened and the ash-slag mixture falls into the flooded space 4 filled with water up to a predetermined level. The liquid level is level-controlled via the line 7. The ash-slag mixture is cooled in the water and fed via a crusher or cell edge 8 of the discharge device 9. By the crusher 8, the ash-slag mixture of the discharge 9 is metered and fed with open valve 10 by means of the system pressure

removed from the flood area.

Too strong approximation of the pressure in the flood chamber 4 to the pressure in the ash transport line S, the pressure on the line 12 in the flood area with the aid of inert gas or steam is increased again or it is aborted the removal of the ash and again at the pressure equalization between the ash sluice. 2 and the flood room 4 was added.

In this case, the valves 11 and 10 are driven in front of the crusher to reduce wear of the valve 10, so that the valve 10th

When opening is treated with clean water. The same objective of reducing wear by opening the valve 10 when exposed to clean water has the time-delayed driving of the lower ash cap head β and the crusher 8 with ashless flood space 4th

The time-delayed closing of the valves 10 and 11 with respect to the stopping of the crusher 8 is to apply the valve 10 when closing with clean water and reduce wear.

At the end of the ash removal, the pressure of the flood space 4 has reached its minimum value. During this operating state, the water level in the flood area 4 is energy-efficiently refilled to its maximum value.

Claims (6)

1. A method for the hydromechanical deashing of compressed gas generators for gasification of particulate and pulverulent coal under pressure with discharge of the dry ash-slag mixture through the lock, extinction in a flood room, crushing in a crusher and hydraulic delivery to the washing compartment, characterized in that the relaxation of Ash sluice (2) carried out within the system between ash sluice (2) and flood chamber (4) and the energy released in the flood space and used for the ash transport in the ash transport line (5) is used to Aschespülraum. 2. The method according to claim 1, characterized in that takes place during the relaxation of the ash sluice (2) of the removal of the ash from the previous cycle ash. 3. The method according to claim 1 and 2, characterized in that the lower closure cone (6) and the valves (10) and (11) are opened simultaneously and the crusher (8) is delayed in operation. 4. The method according to claim 1, characterized in that at ash-free flood space (4) of the lower ash cap head (6) and the crusher (8) with a time delay with respect to the valves (10) and (11) are driven. 5. The method according to claim 1 and 2, characterized in that the valves (10) and (11) after stopping dee crusher (8) and the flushing of the valve (10) are closed with a time delay. 6. The method according to claim 1 and 2, characterized in that the flood space (4) at minimum operating pressure, preferably at the end of the ash removal is filled to a predetermined level with water.