KR101615222B1 - Apparatus and Method for withdrawing Slag - Google Patents

Abstract

A slag removing apparatus and method are proposed. The method for removing slag includes the steps of supplying moisture to a gasifier to discharge the slag to the outside of the gasifier, filtering the liquid slurry made of water and slag by selecting a filter to be used among a plurality of filters, Checking the filtration performance of the filter by checking the foreign matter content, stopping the operation of the filter whose filtration performance has deteriorated through the inspection result, continuing the filtration operation by selecting one of the remaining filters, And checking the stopped filter after removing the slag of the filtered filter.

Description

[0001] Apparatus and Method for withdrawing Slag [

The present invention relates to an apparatus and a method for removing slag.

Generally, the Integrated Gasification Combined Cycle technology is a clean coal utilization technology that gasifies coal, purifies the coal gas, and then combines the purified coal gas with fuel.

The failure of the slag treatment system during the operation of the gasifier is a problem that directly affects the operation of the gasifier. Among these, the slag treatment system in the process of transferring the slag to the accumulation tank or the process of slugging the slag is most frequently occurred.

At this time, the slag accumulated in the lower part of the gasifier is transferred to the lower tank to remove water, and the water is removed through the hydrocyclone to circulate the removed water through the hydrocyclone to the gasifier. At this time, the spray nozzles of the gasifier are clogged due to the particles which have not been completely removed, and the circulation of water is not performed, so that the process frequently stops.

Korean Patent Publication No. 10-2011-0034002

SUMMARY OF THE INVENTION It is an object of the present invention to provide a slag removing apparatus and method for maintaining a smooth flow of slag through water supply for stirring a slag to prevent slag accumulation under the gasifier.

It is another object of the present invention to provide a slag removing apparatus and method for checking the filtration performance by measuring the material flow and density of the filtrate.

According to an aspect of the present invention, there is provided a slag removing method.

The method for removing slag includes the steps of supplying moisture to a gasifier to discharge the slag to the outside of the gasifier, filtering the liquid slurry made of water and slag by selecting a filter to be used among a plurality of filters, Checking the filtration performance of the filter by checking the foreign matter content, stopping the operation of the filter whose filtration performance has deteriorated through the inspection result, continuing the filtration operation by selecting one of the remaining filters, And checking the stopped filter after removing the slag of the filtered filter.

According to another aspect of the present invention, there is provided a slag removing apparatus.

A slag removing device for removing slag of a gasifier generated during a gas production process comprises a water supply part for supplying water to the gasifier so as to discharge slag of the gasifier to the outside of the gasifier, Selecting one of a plurality of filters for filtering the slurry and a plurality of filters to instruct the operation of the filtration operation and checking the foreign matter content of the filtered filtrate from the selected filter to check the filtration performance of the filter in operation, And stopping the operation of the lowered filter and selecting one of the remaining filters to instruct operation of the filtering operation.

The apparatus and method for removing slag according to an embodiment of the present invention can operate slag removal continuously by operating a plurality of filters in conjunction with each other to improve slag removal efficiency and to prevent occurrence of a fault in advance.

1 is a view showing a slag removing apparatus according to an embodiment of the present invention.
2 is a view of a filter according to an embodiment of the present invention.
3 is a flowchart illustrating a slag removing method according to an embodiment of the present invention.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

Hereinafter, an apparatus and method for removing slag according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a slag removing apparatus according to an embodiment of the present invention.

1, the apparatus for removing slag according to an embodiment of the present invention includes a water supply unit 75, a first filter 80, a second filter 82, A third filter 84, and a control unit 90.

First, the gasifier 70 generates synthesis gas as the main product by the gasification reaction of the fuel using coal as fuel. And the gasifier 70 can produce the slag as a by-product by the gasification reaction of the fuel. Where the gasifier 70 can discharge the syngas to the top and discharge the molten slag to the bottom.

The gasifier 70 flows down the melted slag, which is the main slag, to remove it. Here, the molten slag flows into the reservoir under the gasifier 70 and can be collected into a small granular type slag. At this time, the gasifier 70 can supply liquid to the fly ash and non-briquettes flowing into the storage tank through the nozzles to make a liquid slurry. And the gasifier 70 can stir the granular type slag with water using a baffle.

The water supply part (75) supplies water to the gasifier (70). Here, the water supply part 75 may be connected to the water spray nozzle installed in the gasifier 70. And the water supply unit 75 may supply the filtered water to the gasifier 70 through the first filter 80 to the third filter 84 again.

Each of the first to fourth filters 80 to 84 removes the slag from the liquid slurry discharged from the gasifier 70. Here, only the first filter 80 is described with reference to FIG. 2 since the first filter 80 to the third filter 84 are substantially the same.

2 is a view of a filter according to an embodiment of the present invention.

Referring to FIG. 2, the first filter 80 includes a filament filter 100, a filtrate storage tank 140, a pump 160, and a temperature controller 190.

The body filter 100 includes a screen 105, a motor 110, a drive shaft 120, a crusher 130, and a pressure regulator 180.

The screen 105 removes the slag from the liquid slurry. Where the screen 105 can be filtered to a granular type slag by performing filtration below the desired particle size.

The motor 110 drives the crushing unit 130. Here, the motor 110 is connected to the crushing part 130 through the drive shaft 120. The motor 110 may provide power to the crusher 130 with the drive shaft 120.

The driving shaft 120 connects the motor 110 and the crushing unit 130. Here, the drive shaft 120 can be rotated by the motor 110.

The crushing unit 130 crushes the slag filtered by the screen 105. Here, the crushing unit 130 may be powered by the motor 110 to crush the slag. The crushed slag is contained in the slag storage part 150 and can be discharged to the outside.

The pressure regulator 180 regulates the internal pressure of the nasal filter 100. Here, the pressure regulator 180 may pressurize or depressurize the internal pressure of the nakedness filter 100. To this end, the pressure regulator 180 may be supplied with nitrogen gas from an external gas supply unit 170 for pressurization. Alternatively, the pressure regulator 180 may discharge the gas inside the body filter 100 to the outside of the body filter 100 for reducing the pressure.

The filtrate storage tank 140 stores the filtered moisture through the nakedness filter 100. Here, the filtrate storage tank 140 may discharge the filtrate to the outside through the sensing of the level of the stored filtrate.

The pump 160 supplies the filtrate stored in the filtrate storage tank 140 to the water supply unit 75.

The temperature regulator 190 regulates the temperature of the filtrate discharged from the filament filter 100. Here, the temperature controller 190 may increase or decrease the temperature of the filtrate.

The first filter (80) can adjust the filtration rate according to the level of the filtrate collected in the filtrate storage tank (140). The first filter 80 can confirm the slag removal time accumulated in the filter 100 by a predetermined control logic and discharge the slag present in the filter 100 through the discharge port. For example, the first filter 80 can confirm the slag removal time using the pressure difference between the inlet and outlet or the visual observation.

The control unit 90 controls the operations of the first filter 80 to the third filter 84. Here, the controller 90 may select one of the first filter 80 to the third filter 84 to perform the filtering operation. The controller 90 may control the operation of the first to fourth filters 80 to 84 by monitoring the filtration performance of the first filter 80 to the third filter 84, respectively.

The control unit 90 may measure the flow rate of the filtered filtrate in each of the first filter 80 to the third filter 84. [ Here, the material flow of the filtrate can be measured by the following equation (1).

[Equation 1]

Filtrate liquid flow rate = water supply x 0.9

The controller 90 may measure the material flow of the filtrate filtered after the start of operation of the first filter 80 and measure the density of the filtrate when the predetermined material flow reference value is satisfied. Here, the material flow reference value can be set to about 70% or more of the total water supply amount as a value capable of measuring whether or not the filtration is performed well. The control unit 90 stops the operation of the first filter 80 when the filtrate of the first filter 80 is not good and the speed of the filtrate is slow and stops the operation of the second filter 82 or the third filter 84 ) Can be operated. At this time, the control unit 90 finally removes the filtrate of the first filter 80 and removes the slag in the first filter 80 according to the stop of the operation of the first filter 80, Can be checked for damage. The first filter (80) is maintained in an operation stop state after the inspection is finished, and can wait until the next operation.

The controller 90 measures the density of the filtrate to detect the content of the solid component and maintains the operation of the first filter 80 when the measured density of the filtrate satisfies the density reference value. Here, the density reference value may be set to a solid content of about 2% or less as a foreign substance. And the reference density can be set to 1.

On the other hand, when the density of the filtrate is higher than the density reference value because the solid content of the filtrate is high, the controller 90 stops the operation of the first filter 80 and stops the operation of the second filter 82 or the third filter 84, Can be operated.

Here, the reason why the first to fourth filters 80 to 84 are used is to remove the filtrate in the filter, or to prepare a filter with extra margin in case the slag removal or the damper filter is damaged.

The control unit 90 may control the water supply unit 75 to supply water to the gasifier 70 when additional water supply is required depending on the level inside the gasifier 70. [ The controller 90 may adjust the amount of the liquid slurry supplied to the first to third filters 80 to 84 through the level controller connected to the gasifier 70.

In addition, the controller 90 may measure the temperature of the filtrate, and if necessary, cool the filtrate through the water supply unit 75 and supply the filtrate to the gasifier 70. The control unit 90 may measure the temperature of the water supplied to the gasifier 70 and control the temperature by the control of the water supply unit 75.

The slag removing apparatus according to an embodiment of the present invention can operate the plurality of filters in conjunction with each other to continuously remove the slag, thereby improving the slag removal efficiency and preventing the occurrence of faults.

3 is a flowchart illustrating a slag removing method according to an embodiment of the present invention.

Referring to FIG. 3, the method of removing slag according to an embodiment of the present invention includes discharging slag from a gasifier (S110), selecting a filter to be used among a plurality of filters, (S120), checking the foreign matter content of the filtrate filtered by the filter in use, and checking the filtering performance of the filter (S130). If the filtering performance of the filter in use is degraded, the operation of the filter is stopped In operation S140, one of the remaining filters is selected to perform a filtration operation in operation S150. In operation S150, the slag in the filtered filter is removed and the filter is inspected in operation S160.

In step S110, after the gasifier is operated, water is supplied to the gasifier to discharge the slag generated in the gasifier to the outside of the gasifier. Here, the water can be supplied by controlling the water supply unit connected to the gasifier.

In step S120, one of the plurality of filters connected to the gasifier is selected to select the filter to be used. Then, the selected filter is supplied with the liquid slurry discharged from the gasifier, which is composed of water and slag, and performs filtration. For example, the first filter selected from the first filter, the second filter and the third filter receives the liquid slurry discharged from the gasifier and filters the slag contained in the liquid slurry.

In step S130, the substance flow of the filtrate is measured to check the foreign matter content of the filtrate filtered in the filter. The material flow of the filtrate can be measured by the above-described equation (1). And compares the material flow of the filtrate with a preset material flow reference value. Where the material flow reference value can be set at about 70% or more of the total water supply. If the material flow of the filtrate exceeds the material flow reference value, the density of the filtrate is measured and the filtration performance of the filter is determined by comparing the density of the measured filtrate with a predetermined density reference value. Here, the density reference value can be set to about 2%.

In step S140, if the filtration performance of the filter is deteriorated through the comparison of the material flow and the density of the filtrate, one of the remaining filters is selected to perform the filtration operation and the performance of the filter to be operated is determined.

Specifically, if the material flow of the filtrate is below the material flow reference value, the filtering operation of the selected filter is stopped, the filtering operation of the filter is stopped, and one of the remaining filters is selected to perform filtration of the selected filter. If the density of the measured filtrate exceeds the density reference value as a result of comparison, the filtration operation of the filter can be stopped and one of the remaining filters can be selected to perform filtering operation of the selected filter.

For example, if the filtration performance of the first filter is deteriorated, the operation of the first filter may be stopped, and the second filter may be selected to continuously perform the filtration operation. If the filtration performance of the second filter is deteriorated, the operation of the second filter may be stopped, and the filtration may be continuously performed by selecting the third filter.

If the check result is less than the density reference value of the measured filtrate, the filtration operation can be maintained in accordance with the measurement cycle of the material flow and the density. Here, the measurement period can be set to one per 10 minutes. That is, if the filtration performance of the filter is good as a result of the check, the filtration operation of the filter is continued until the next measurement.

In step S150, the filtrate and slag in the filter whose operation is stopped are removed and the filter damage of the filter is checked. The checked filter waits until the next operation.

The method of removing slag according to an embodiment of the present invention can operate slag removing operation continuously by operating a plurality of filters to improve slag removal efficiency and to prevent occurrence of a fault in advance.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

70: Gasifier
75:
80, 82, 84: first filter, second filter, third filter
90:
100: Native filter
105: Screen
110: motor
120: drive shaft
130:
140: Filtrate tank
150: Slag storage part
160: Pump
170: gas supply unit
180: Pressure regulator
190: Temperature control unit

Claims (8)

Supplying moisture to the gasifier to discharge the slag to the outside of the gasifier;
Selecting a filter to be used among the plurality of filters and filtering the liquid slurry comprising the water and the slag;
Checking the foreign matter content of the filtrate filtered from the selected filter to check the filtration performance of the filter;
Stopping the operation of the filter whose filtration performance has deteriorated through the check result;
Selecting one of the remaining filters to continue filtering; And
And removing the slag from the filtered filter and checking the filtered filter.
The method according to claim 1,
In the step of checking the filtration performance of the selected filter
Wherein at least one of the material flow and the density of the filtrate is measured to check a foreign matter content of the filtered filtrate in the selected filter, and the measured value is compared with a corresponding one of a predetermined material flow reference value and a density reference value. 3. The method of claim 2,
Wherein the material flow reference value is set to 70% or more of the total water supply amount.
3. The method of claim 2,
Wherein the density reference value is set to be within 2% of the solid content contained in the filtrate, and is set assuming that the density of the reference moisture is 1. [
A slag removing apparatus for removing slag of a gasifier generated in a gas generating process,
A water supply unit for supplying water to the gasifier to discharge slag of the gasifier to the outside of the gasifier;
A plurality of filters composed of the moisture and the slag to filter the liquid slurry discharged from the gasifier; And
Selecting one of the plurality of filters to instruct the operation of the filtration operation and checking the foreign matter content of the filtrate filtered from the selected filter to check the filtration performance of the filter in operation and check the operation of the filter having the reduced filtration performance And selecting one of the remaining filters to instruct operation of the filtration operation.
6. The method of claim 5,
The control unit
Wherein a material flow and a density of the filtrate are measured to check a foreign matter content of the filtered filtrate in an operating filter, and the measured substance flow and density are compared with a preset reference value and density reference value.
The method according to claim 6,
Wherein the material flow reference value is set to 70% or more of the total water supply amount.
The method according to claim 6,
Wherein the density reference value is set to be within 2% of the solid content contained in the filtrate, and is set assuming that the density of the reference moisture is 1. [

Images