JPS5837420A - Method and device for supplying coal-water suspension to burner of pressure gassifying device or combustion apparatus of coal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for supplying a coal-water suspension to the burner of a pressurized coal gasification or combustion apparatus.

Suspensions have already been used in the field of combustion and gasification technology for several years, i.e. coal is wet-comminuted and the resulting suspension is fed to the combustion or gasification station, where it is pulverized. It is loaded via the

A suspension of coal powder* and water has the advantage that it can be supplied by a pump. In coal gasification processes that use a water-containing fuel or suspension, the suspension has a solids content of 70% or less. A considerable proportion of water must therefore be evaporated during gasification.

This results in heat loss.

Equipment implementing such known methods is relatively expensive. This is because it is necessary to maintain the suspension state during the feeding process from the hot crusher to the reactor, which significantly increases the cost of the fruiting equipment.

It is therefore an object of the present invention to propose a method for supplying a coal-water suspension to the burners of a pressurized gasification device or combustion device for r1 coal, so that the suspension burner (also known as a mixed burner) of the respective device (as referred to above), for example, to obtain a solids concentration in suspension that reduces the amount of excess water vapor in the gasifier, significantly improving the cold gas efficiency and thermal efficiency and reducing the demand for oxygen. That's true.

The task is to prepare relatively water-rich coal, wet-milled and possibly with additives to obtain a suspension, before feeding it to the pressurized gasification reactor or burner of the combustion plant. , the problem can be solved by a method of concentrating to a solid concentration of 7 or more.

In this way, excess water vapor can be optimally reduced, for example in a pressurized coal gasification plant.

The apparatus for carrying out the method described above has the following characteristics. That is, the concentrator with a backwashing device consists of a storage tube containing a coal-water suspension, this V-1 filter tube being surrounded by a tubular jacket, and between the filter tube and the tubular jacket. A space is used for drawing off the separated liquid and supplying and discharging the discontinuously supplied cleaning medium, and a throttling device is provided at the narrowed outlet of the filter tube.

Because of the water-rich sludge (40 to 50% of the 116 sludge can be considered), Type 41 grinding of 5-charcoal does not impose any special demands on the equipment. When supplying suspensions, no special problems arise regarding the selection of pumps.

An intermediate vessel or addition vessel (for feeding and mixing additives)? ``r path, and therefore the pump required for intermediate supply can also be omitted.

According to the invention, a density measuring device is provided at the narrowed outlet of the screening pipe. The purpose of this density measuring device is, for example, to keep the concentration of the suspension constant reaching the pressurized gasification reactor. is reduced by an appropriate number of cleaning pulses in the range of .

It should be noted that the pulsed IfN during backwashing is temporary and is controlled with respect to the amount of cleaning medium in such a way that the cycle of backwashing and pauses is usually characterized by short pulse and pause times, so that the cleaning process discontinuities are eliminated and the suspension reaches the reactor (5) with a substantially constant solids concentration.

The invention will be explained below with reference to the drawings.

Coal reaches wet crushing R2 from the Fi coal bunker.

The coal-water suspension formed here flows into a suspension pump 4 via a filter device 3 which preserves large coal particles and foreign matter. This pump 4 sends the US liquid to the intermediate container 5, and can supply additives or added water useful for improving WIA turbidity to this #3 intermediate container 5. The addition of such additives becomes necessary, for example, when US fluids are to be supplied over large distances. The suspension is pumped from this container 5 to a concentrator 7 via a pump 6. The concentrator 7 consists of a filter tube 8 and a tubular jacket 9 surrounding the F5 filter tube 8. The outlet below the concentrator 7 is narrowed in the form of a throttle device 10 . A density measuring device 11 is provided above the gauze device IO. The concentrated coal sludge is then fed to burner 17 of pressurized gasification reactor 18.

The suspension supplied to the filtration tube 8 and Bl! between the filtration tube 8 and the jacket 9! Liquid separated from iJ liquid (6) There is a gap between the internal resistance of the suspension and the space filled with the body.
A pressure difference appears which is determined by the resistance of the micropores of the tube 8 and the resistance of the basic setting of the valve 12.

The suspension is concentrated using this pressure difference.

The i7474 conduit 8 size is matched to the maximum concentration ratio and diffusion resistance of the suspension. The throttle device IO makes it possible to reduce the pressure in the offshore conduit 8 if necessary.

In some cases, it may contain fine particles. The body separated from the 8 vessel 7 is returned via the valve 12 to guard the suspension again.

In order to keep the v-r conduit 8, which may be configured as a slit, in a microporous state, a discontinuous cleaning process can be applied. For this purpose, the cleaning medium pump 14 must be operated via the control device 13. This pump 14 first conveys the cleaning medium via a cleaning medium conduit 15 up to a reversing valve 16 .

Simultaneously with the start of operation of the pump 14 by the control device 13, the cleaning process chamber 16 must be opened and the valve 2 must be closed (7). After the end of the pulse cleaning, the valve 16 is closed via the control device 13 and at the same time the valve 12 is opened again.

Via the known density measuring device 11, the concentration of the suspended Ei can be kept constant by the initially mentioned control device.

Since the cleaning interval is short in the backwashing process, the rotary pump 14 is preferably operated continuously, and if the interval between cleaning pulses is long, the pump I4 can be stopped.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an apparatus for manufacturing and supplying a suspension in an example of a pressurized gasification apparatus for C charcoal, and Figure 2 is a diagram showing details of a part of this apparatus. be. 2... Wet grinding type, 7... Concentrator, 8... J5 tube, 9... Tubular jacket, lO... Grating device, 17...
・Burner, 18...pressurized gasification reactor (8,"65

Claims (1)

[Claims] l Coal containing a relatively high moisture content, which has been wet-milled and optionally has been added with additives to obtain a suspension, is placed in a pressurized gasification reactor (18) or in a combustion device. A method for feeding a coal-water suspension to a burner of a pressurized coal gasifier or combustion device, characterized in that it is concentrated to a solids concentration of 70% or more before being fed to the burner (17). 2. Coal that has been crushed in the Sakai style, possibly with additives added to obtain a suspension, and has a relatively high moisture content, is sent to the pressurized gasification reactor (18) or to the burner (17) of the combustion device. Concentrator (7) equipped with a backwash device, in an apparatus for concentrating to a solids concentration of 70% or more before feeding
consists of a filter tube (8) containing a coal-water suspension;
This filtration tube (8) is surrounded by a tubular jacket (9), and the space between the filtration tube (8) and the tubular jacket (9) leads to and is supplied discontinuously with the separated liquid. Pressurized gasification or combustion device for coal, characterized in that the narrowed outlet [1 of the filter tube (8) is provided with a throttling device (10), which is used for supplying and discharging the cleaning medium. A device that supplies coal-water suspension to the burner of the device. 3 Attach the density measuring device (1) to the narrowed outlet of the filtration tube (8).
2. Device according to claim 2, characterized in that: 1) is provided.