JP5725791B2 - Slag discharge system and method of operating slag discharge system - Google Patents

Description

  The present invention relates to a slag discharge system that collects and discharges generated slag and a method for operating the slag discharge system.

  There is a technology for generating power by driving a gas turbine with coal gas obtained by gasifying coal. In order to gasify coal, a coal gasification furnace is used. When coal is gasified, slag remains as burnt in the coal gasifier. Such slag needs to be discharged from the coal gasifier. Since slag has fluidity at a sufficiently high temperature, it is generally discharged continuously from a slag hole provided in the lower part of the coal gasification furnace. Below the slag hole, a slag discharge cylinder filled with cooling water is provided. The slag is cooled and solidified by the cooling water, and then discharged from the slag discharge cylinder.

  As a system for discharging slag, there are apparatuses as described in Patent Document 1, Patent Document 2, and Patent Document 3. In any of the devices described in Patent Document 1 or Patent Document 2, the solidified slag is conveyed to a storage tank or the like by a belt conveyor. Further, the device described in Patent Document 3 describes a mechanism that is disposed in a housing and conveys slag to a container by rotating a shaft on which a plurality of flights are mounted.

JP 2002-122319 A JP 2003-88832 A JP-T-2003-518157

  Here, the discharge system described in Patent Document 1 to Patent Document 3 is configured to convey slag by a belt conveyor or a screw. For this reason, there is a problem that the degree of freedom of the apparatus configuration is low because the inclination angle of the conveyor is limited or the conveyor and the screw need to be arranged on a straight line. Moreover, although it can convey reliably by conveying slag with a scraper and a scraping nail, conveyance by one scraper and a scratching nail has a limit in conveyance amount, and conveyance becomes intermittent conveyance. .

  This invention is made | formed in view of the above, Comprising: It aims at providing the operating method of the slag discharge system which can discharge | emit slag more simply and efficiently, and a slag discharge system.

A first invention for solving the above-described problem is that a slag lock hopper that temporarily stores granulated slag supplied from a slag hopper, and a predetermined amount of granulated slag from the bottom of the slag lock hopper via an opening / closing valve. A slag reservoir that is dropped and cooled and stored, a slurry tank that stores granulated slag discharged from the slag reservoir via a slag conveyor, and slurry water, and a slag slurry that is slurried in the slurry tank are conveyed. and slag slurry transporting section having a slag slurry pump, from the slag slurry is conveyed from the slag slurry transporting section, and a slag storage tank for storing separated and discharged granulated slag slurry water, separated and discharged from the slag storage tank A recovery unit that collects the discharged water and supplies it to the slurry tank; and falls or slag in the slag reservoir A detection device for detecting the amount of slag in granulated slag discharged from comprising a result of detection of the detecting device, when the amount of slag from the slag lock hopper is equal to or less than a predetermined value, the slag from the slag reservoir In the slag discharge system, when the discharge of the granulated slag is completed by the conveyor, the load of the slag slurry pump is controlled to be low .

According to a second invention, in the first invention, when the supply of the granulated slag from the slag lock hopper is resumed to the slag reservoir, the load of the slag slurry pump is controlled to be normal. The slag discharge system is featured.

3rd invention is 1st or 2nd invention. WHEREIN: The said detection apparatus is provided in the weight measurement apparatus which measures the weight of a slag reservoir tank, or a slag reservoir tank, and the slag conveyor which discharge | releases granulated slag outside The slag discharge system is characterized in that it is at least one of a weight measuring device that measures the weight above and a concentration meter that detects the concentration of slag falling from the slag conveyor .

A fourth invention is a slag lock hopper that temporarily stores granulated slag supplied from a slag hopper, and a predetermined amount of granulated slag is dropped from the bottom of the slag lock hopper via an on-off valve to cool and store A slag reservoir, a slurry tank for storing granulated slag discharged from the slag reservoir via a slag conveyor and slurry water, and a slag having a slag slurry pump for conveying the slag slurry slurried in the slurry tank A slurry transport unit, a slag storage tank that separates and discharges slurry water and stores granulated slag from the slag slurry transported from the slag slurry transport unit, and collects drain water separated and discharged from the slag storage tank And a recovery unit that supplies the slurry tank, and a granulated slag that falls into or is discharged from the slag reservoir A slag discharge system comprising: a detection device that detects a slag amount of the slag, and if the slag amount from the slag lock hopper is equal to or less than a predetermined value as a result of detection by the detection device, the slag conveyor from the slag reservoir When the discharge of the granulated slag is completed, the load of the slag slurry pump is changed to a low load, and the slurry water is supplied to the slag storage tank.

In a fourth aspect of the invention, in the fourth aspect of the invention, when the supply of the granulated slag from the slag lock hopper is resumed to the slag reservoir, the load of the slag slurry pump is changed to normal. The method of operating the slag discharge system is characterized by the following.

  The slag discharge system according to the present invention has an effect that the slag can be discharged while reducing power in the conveyance of the slag.

Drawing 1 is a mimetic diagram showing a schematic structure of one embodiment of a slag discharge system. FIG. 2 is a time chart showing the relationship between the slag discharge amount from the slag lock hopper, the slag discharge amount of the slag conveyor, the load of the slag slurry pump, and the slag slurry concentration. FIG. 3 is a flowchart for explaining the operation of the slag discharge system.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

  Embodiments of a slag discharge system according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

Drawing 1 is a mimetic diagram showing a schematic structure of one embodiment of a slag discharge system. First, the gasification furnace 12, the slag hopper 14, the on-off valve 16, and the transport vehicle 18 arranged around the slag discharge system 20 shown in FIG. 1 will be described. The gasification furnace 12 gasifies a combustion substance such as coal and supplies the generated gas to the combustion furnace or the like.
Further, the gasification furnace 12 drops the molten slag 13 generated when gasifying the combustion substance at the bottom thereof from the slag hole 15 to the slag cooling water 17 to form a granulated slag 19 and then disposed at the lower part. It is stored in the slag hopper 14. The slag hopper 14 is a storage mechanism that is disposed below the gasification furnace 12, collects the granulated slag 19 generated in the gasification furnace 12, and stores the granulated slag 19. The slag hopper 14 has a funnel shape with a diameter that decreases toward the lower side in the vertical direction, and the water slag 19 generated at the bottom of the gasification furnace 12 is moved downward in the vertical direction. Collect crushed slag 19 in one place. The on-off valve 16 is disposed at the lower end in the vertical direction of the passage path of the granulated slag 19 of the slag hopper 14. The on-off valve 16 switches between starting and stopping the discharge of the granulated slag 19 stored in the slag hopper 14 to the slag discharge system 20 by switching between opening and closing. The granulated slag 19 discharged from the on-off valve 16 is a fluid containing slag cooling water 17.
Here, the molten slag 13 dropped into the slag cooling water 17 is rapidly cooled to become particles of a glassy granulated slag 19, and the size thereof is about several millimeters to several tens of millimeters.

  The conveyance vehicle 18 is a vehicle that carries the granulated slag 19 discharged from the slag discharge system 20 to a predetermined position. A truck can be used as the transport vehicle 18. In addition, although it was set as the structure discharged | emitted to the conveyance vehicle 18 in this embodiment, this invention is not limited to this, It can discharge | emit to various objects.

  Next, the slag discharge system 20 will be described. The slag discharge system 20 drops the molten slag 13 generated in the gasification furnace 12 into the slag cooling water 17 to form a granulated slag 19, and transports the granulated slag 19 discharged from the on-off valve 16 of the slag hopper 14. 18 is a system for discharging. The slag discharge system 20 includes a slag lock hopper 22, a slag reservoir 26, a slag transfer unit (slag slurry transfer unit) 28, a slag storage tank 30, and a discharge port 32.

  The slag lock hopper 22 is a storage unit that temporarily stores the granulated slag 19, and is disposed directly below the on-off valve 16. The slag lock hopper 22 temporarily stores the granulated slag 19 discharged from the on-off valve 16, and then periodically supplies it to the slag reservoir 26, which is a slag cooling unit, via the on-off valve 22a.

  The slag reservoir 26 has a slag reservoir tank 26a and a slag conveyor 26b driven by a motor M, and supplies the granulated slag 19 discharged from the slag lock hopper 22 to the slag transport unit 28 by a predetermined amount. The slag conveyor 26b is a transport mechanism that is dropped into the slag reservoir tank 26a and transports the granulated slag 19 together with water. A part of the slag conveyor 26 b is disposed in the slag reservoir tank 26 a, holds the granulated slag 19 in the slag reservoir tank 26 a, moves it, and discharges it to the slag transport unit 28.

The slag reservoir tank 26a of the slag reservoir 26 is provided with a weight measuring device 201 for measuring the weight thereof, and the discharge amount of the granulated slag 19 is measured each time.
The weight signal of the weight measuring device 201 is sent to the control means 202 and processed. As a result of the arithmetic processing, when the weight of the granulated slag 19 is less than a predetermined value, that is, when the empty state is judged, the capacity (number of rotations) of the slag slurry pump 43 is reduced from the normal load (100% load operation). Control is performed so that a load operation state is achieved.
If it is determined that the weight of the slag reservoir 26a of the slag reservoir 26 is not empty (when it falls again), control is performed to a normal load (100% load operation).
By performing this control, the power of the slag slurry pump 43 is reduced, and the power cost of the entire system can be reduced.

  The slag transport unit (slag slurry transport unit) 28 is a transport mechanism that transports the granulated slag 19 discharged from the slag reservoir 26 to the slag storage tank 30 as a slurry, and includes a slurry tank 40, a transport pipe 42, and a slag It has a slurry pump 43, a liquid level adjusting means 44, a recovery pipe 62, and water receiving parts 63a and 63b. The slurry tank 40 is a tank that stores the granulated slag 19 supplied from the slag reservoir 26 and the slurry water 29. The slurry tank 40 stores the granulated slag 19 dispersed in the slurry water 29. The transport pipe 42 is a pipe that connects the slurry tank 40 and the slag storage tank 30. The slag slurry pump 43 is interposed in the transport pipe 42, and forms a flow in which the slag slurry 41 in which the granulated slag 19 in the slurry tank 40 is dispersed in the transport pipe 42 flows to the slag storage tank 30. As described above, the slag transport unit 28 converts the granulated slag 19 dispersed in the slurry water 29 in the slurry tank 40 into the slag slurry 41 and transports it to the slag storage tank 30 by the transport pipe 42 and the slag slurry pump 43.

  Next, the liquid level adjusting means 44 controls the supply of the slurry water 29 to the slurry tank 40 and adjusts the liquid level of the slurry tank 40. The liquid level adjusting means 44 includes a water storage tank 50, a supply pipe 51, a water supply pump 52, a circulation pipe 53, an overflow pipe 54, an on-off valve 56, a level meter 58, and a liquid level control unit 60. Have. The water storage tank 50 is a tank that stores water. The supply pipe 51 is a pipe that connects the water storage tank 50 and the slurry tank 40. The water supply pump 52 is disposed in the supply pipe 51, and forms a flow in which the slurry water 29 stored in the water storage tank 50 flows toward the slurry tank 40 in the supply pipe 51. That is, the water supply pump 52 flows the water stored in the water storage tank 50 toward the slurry tank 40. The circulation pipe 53 is a pipe that connects a portion of the supply pipe 51 closer to the slurry tank 40 than the water supply pump 52 and the water storage tank 50. Next, the overflow pipe 54 is a pipe that connects the wall surface of the predetermined liquid level of the slurry tank 40 and the water storage tank 50. The overflow pipe 54 is arranged in such a direction that the slurry water 29 in the slurry tank 40 flows when the liquid level of the slurry tank 40 exceeds the connected portion. The overflow pipe 54 discharges the slurry water 29 discharged from the slurry tank 40 to the water storage tank 50.

  Next, the on-off valve 56 is disposed closer to the slurry tank 40 than the portion of the supply pipe 51 where the circulation pipe 53 is provided, and switches between opening and closing the pipe line of the supply pipe 51. The liquid level adjusting means 44 flows through the supply pipe 51 when the on-off valve 56 is opened, the slurry water 29 flowing through the supply pipe 51 is supplied to the slurry tank 40, and the on-off valve 56 is closed. Water is not supplied to the slurry tank 40. When the on-off valve 56 is closed, the water flowing through the supply pipe 51 by the water supply pump 52 is returned to the water storage tank 50 by the circulation pipe 53. Thereby, it can be set as the state which always driven the water supply pump 52, and control with high responsiveness is attained.

  The level meter 58 is a sensor that detects the liquid level (in this embodiment, the water level) of the slurry water 29 in the slurry tank 40. As the level meter 58, various sensors that can detect the position of the liquid surface (water surface) of water (slurry in which water and slag are mixed) stored in the slurry tank 40 can be used.

  The liquid level controller 60 controls the opening / closing operation of the opening / closing valve 56 based on the liquid level detected by the level meter 58. That is, the liquid level control unit 60 switches whether to supply the water stored in the water storage tank 50 to the slurry tank 40 based on the liquid level detected by the level meter 58. The control operation by the liquid level control unit 60 will be described later. Further, the liquid level control unit 60 may control the operation of each unit as necessary in addition to the on-off valve 56. In addition to the liquid level control unit 60, a control unit for controlling each unit may be separately provided.

  The recovery pipe 62, which is a liquid recovery section, is a conduit for recovering the discharged water 33 separated and discharged from the slag storage tank 30, and connects the water receiving section 63a and the slurry tank 40 to connect the water receiving section 63b and the slurry. The tank 40 is connected. The water receiving portions 63 a and 63 b are disposed below the water discharge portion of the slag storage tank 30, and collect the discharged water 33 discharged and separated from the slag storage tank 30. The water receivers 63a and 63b cause the recovered discharged water 33 to flow through the recovery pipe 62. The water receiving portion 63 a is disposed below the inclined portion of the slag storage tank 30, and the water receiving portion 63 b is disposed below the vertical portion of the slag storage tank 30.

  The slag storage tank 30 is a tank that stores the slag slurry 41 transported by the slag transport unit 28. The slag storage tank 30 has a main body 101 and a filter 106. The main body 101 is a hollow tower, and in this embodiment, has a cylindrical shape with a square cross section (horizontal surface), and an end portion with a gradually decreasing diameter is provided on the lower side in the vertical direction. The filter 106 is a member that does not allow the granulated slag to pass but allows the slurry water to pass therethrough, and a plurality of the filters 106 are disposed on the side surface (wall surface) of the main body 101. The plurality of filters 106 are arranged at respective positions in the vertical direction on one surface of the main body 101. As the filter 106, a member in which a plurality of holes having a diameter through which slag cannot pass and water can pass can be used. The slag storage tank 30 is configured as described above. When the slag slurry 41 composed of the granulated slag and the slurry water 29 is supplied from the slag transport unit 28, only the water is discharged from the filter 106 and the discharged water 33 is discharged. At the same time, the granulated slag 19 is stored therein.

  The discharge port 32 is disposed at the lower end of the slag storage tank 30, and controls the execution and stoppage of the granulated slag 19 stored in the slag storage tank 30. The granulated slag 19 discharged from the discharge port 32 is discharged to the transport vehicle 18 that is waiting directly below.

  The slag discharge system 20 is configured as described above, and the granulated slag 19 generated at the bottom of the gasification furnace 12 is recovered by the slag hopper 14, and the granulated slag 19 discharged from the on-off valve 16 is recovered by the slag lock hopper 22. The slag cooling water 17 is temporarily stored together. The slag discharge system 20 drops the granulated slag 19 stored in the slag lock hopper 22 into the slag reservoir tank 26a of the slag reservoir 26 by a predetermined amount every predetermined time, and the slurry tank 40 is moved by the slag conveyor 26b installed in the slag reservoir tank 26a. Transport the fallen objects to.

  The slag discharge system 20 conveys the granulated slag 19 stored in the slurry tank 40 to the slag storage tank 30 as the slag slurry 41 by the slurry water 29 by the transport pipe 42 and the slag slurry pump 43. Moreover, the slurry water 29 conveyed to the slag storage tank 30 together with the granulated slag 19 is discharged from the filter 106 and falls to the water receiving portions 63a and 63b to become discharged water 33. The discharged water 33 that has dropped to the water receiving portions 63 a and 63 b is conveyed to the slurry tank 40 via the recovery pipe 62 and reused as the slurry water 29 again. Further, the liquid level adjusting means 44 maintains the liquid level of the slurry tank 40 within a certain range.

  The slag discharge system 20 continues the slag conveyance described above. In the slag storage tank 30, the granulated slag 19 from which the discharged water 33 is separated is discharged from the discharge port 32 to the transport vehicle 18, and the transport vehicle 18 loads the granulated slag 19 and transports the slag to a predetermined point. To do. The transport vehicle 18 sequentially moves directly below the discharge port 32, and moves to a predetermined point after loading the slag. Thus, the conveyance vehicle 18 repeats conveyance of slag.

Next, operations of the slag discharge system 20, particularly the slag reservoir 26 and the slag slurry transport unit 28 will be described with reference to FIGS. 2 and 3.
FIG. 2 is a chart showing the relationship between the slag supply amount from the slag lock hopper 22, the slag discharge amount of the slag conveyor 26b, the load of the slag slurry pump 43, and the slag slurry concentration in time series. In FIG. 2, the situation of five drops from slag discharge I to slag discharge IV is shown.

As shown in FIG. 2, for example, in the first slag discharge I, when the predetermined granulated slag 19 is discharged (supplied) from the slag lock hopper 22, the slag conveyor 26 b is driven, and the slag slurry of slag emissions of water granulated slag 19 to the tank 40 is made. Incidentally, T ₁ is the opening and closing valve 22a of the regularly slag lock hopper 22 as opened at regular intervals, a supply of water granulated slag (fall) time.
Granulated slag 19 within the time of the T ₁ is supplied to the slag reservoir 26a from the slag lock hopper 22 (falling). T ₂ is a state in which the on-off valve 22a is closed.
In this embodiment, when the discharge of the granulated slag 19 to the slurry tank 40 is completed within a predetermined time, the amount of the slag slurry 41 discharged from the slag slurry tank 40 is reduced. Is changed from normal (100% load) to low load (for example, 50% load) to reduce the supply amount of the slag slurry 41 to the slag storage tank 30.

Thus, when the discharge of the slurry tank 40 of the granulated slag 19 within a predetermined time is completed, the supply of slurries water 29 only. For this reason, the slag slurry pump 43 is not driven at a normal load (100%), and the power is reduced by operating at a low load (for example, 50%), so that the cost of the power of the entire system can be reduced. .

FIG. 3 is a flowchart for explaining the operation of the slag discharge system.
The control means 202 of the slag discharge system 20 first measures the weight of the slag reservoir 26 as step S11. In step S11, the control means 202 opens the on-off valve 22a, measures the slag weight at which a predetermined amount of the granulated slag 17 falls, and determines whether the measured slag amount is equal to or less than a predetermined value in step S12.

  If the control means 202 determines that the slag weight determined and measured in step S12 is equal to or less than the predetermined value (the supply amount is small) (step S12: Yes), the control means 202 proceeds to step S13, and the discharge by the slag conveyor 26b is completed. Is confirmed, the currently set slag slurry pump 43 is changed to low load operation (for example, 50% load operation). That is, the number of rotations of the slag slurry pump 43 is lowered to reduce the supply amount of slurry. Thereafter, the control means 202 proceeds to step S14.

  Moreover, if the control means 202 detects the signal whose measured slag weight is a weight value other than zero in step S14 (step S15: Yes), it will judge that the on-off valve 22a opened and supply of the granulated slag 19 was restarted. In step S16, the slag slurry pump 43 is changed to the normal load operation (100% load operation). That is, the rotation speed of the slag slurry pump 43 is set to the normal rotation speed, and the supply amount of the slurry is returned to the normal state.

  If it is determined in step S15 that the measured slag weight is equal to or smaller than the predetermined value (step S15: No), the control unit 202 measures the weight of the slag reservoir 26 again in step S14.

  If it is determined in step S12 that the measured slag weight is equal to or greater than the predetermined value (large supply amount) (step S12: No), the control unit 202 continues normal load operation (100% load operation) as step S17. To do. That is, since the amount of the granulated slag 19 dropped is large, the supply amount of the slurry is continued with the rotation speed of the slag slurry pump 43 kept at a normal rotation speed. In this case, as shown in the slag discharge III shown in FIG. 2, the next granulated slag 19 is supplied before the completion of the slag discharge.

  In step S18, the control unit 202 determines whether the process is completed (process completed). If it is determined in step S18 that the process is not completed (No), the control unit 202 proceeds to step S11 and repeats the above-described process. On the other hand, the control means 202 will complete | finish a process, if it determines with it being process completion (Yes) by step S18.

The slag discharge system 20 is configured as described above, and the granulated slag 19 is mixed with the slurry water 29 and supplied to the slag storage tank 30 in a slurry state, whereby the granulated slag 19 is supplied to the slag storage tank 30. Can be transported.
Moreover, since the slag discharge system 20 is made into a slurry and transports the granulated slag 19, it is possible to increase the degree of freedom of the route of the piping. That is, the slag can be transported even if the transport path is not linear, and the transport path has an arbitrary inclination angle. Thereby, an apparatus can be arrange | positioned compactly.

  Further, by providing a filter 106 on the side surface of the slag storage tank 30 and discharging water (liquid), the water used for transporting the slag can be efficiently and easily discharged from the slag storage tank 30. be able to. In addition, by collecting the water discharged from the filter 106 of the slag storage tank 30 and returning it to the slurry tank 40, the water used for transportation can be used efficiently. Further, even when a part of the granulated slag 19 is discharged from the filter 106, it can be supplied again to the slag storage tank 30 as the slag slurry 41, and the granulated slag 19 can be transported more efficiently. it can.

In the above embodiment, the weight of the granulated slag 19 falling from the slag lock hopper 22 is measured by the weight measuring device 201. However, the present invention is not limited to this. You may make it measure the fall weight using the weight measuring apparatus which measures the weight on the slag conveyor 26b which discharges the slag 19 outside.
Alternatively, a concentration sensor for detecting the concentration of slag falling from the slag conveyor 26b into the slurry tank 40 is provided, whether or not the granulated slag 19 is discharged is confirmed, and the information is sent to the control means 202, and the slag slurry pump 43 When supplying only water by controlling the number of rotations, the power of the slag slurry pump 43 is reduced to reduce the power cost of the entire system.

  Furthermore, the slag discharge system 20 maintains the liquid level (water level) of the slurry tank 40 within a certain range by the liquid level adjusting means 44. Thereby, the water held in the slurry tank 40 can be in a certain range, and the slag concentration of the slurry sent from the slurry tank 40 to the slag storage tank 30 can be in the certain concentration range. That is, even if the amount of water discharged from the slag storage tank 30 and recovered into the slurry tank 40 changes, the liquid level in the slurry tank 40 can be kept within a certain range. For example, even if the storage of slag in the slag storage tank 30 has changed and the liquid level has changed, the amount of water discharged from the slag storage tank 30 has changed, and the amount of recovered water has changed. Accordingly, the liquid level adjusting means 44 adjusts the supply of water to the slurry tank 40, so that the liquid level of the slurry tank 40 can be maintained within a certain range.

  Thus, the slag discharge system 20 can suppress the concentration of the slag in the slurry within a certain concentration range, thereby increasing the concentration of the slag and preventing the slurry from being conveyed. For example, the concentration of slag in the slurry can be maintained at 40% or less, and the slag can be appropriately conveyed from the slurry tank 40 to the slag storage tank 30. Moreover, the slag discharge system 20 can convey slag efficiently because the density | concentration of the slag in a slurry can be in a fixed density | concentration range. That is, it can suppress that the quantity of slag contained in a slurry decreases and conveyance efficiency falls. The range of the slag concentration in the slurry is not particularly limited because it varies depending on the configuration of the apparatus, the performance of the pump, and the like. For example, it is preferably 5% to 40%.

  The slag discharge system 20 may control the supply of slag to the slurry tank 40 by controlling the driving of the slag conveyor 26 b of the slag reservoir 26. The supply of slag to the slurry tank 40 may be controlled as being constant.

  In addition, the liquid level adjusting means 44 can provide the overflow pipe 54 so that the liquid level of the slurry tank 40 can be more surely kept below a certain liquid level. Moreover, the liquid level adjusting means 44 can be in a state where the water supply pump 52 is always operated by providing the circulation pipe 53. Thereby, responsiveness can be made high. The water circulated by the liquid level adjusting means 44 and the water stored in the water storage tank 50 may be used for other purposes.

  Further, the liquid level adjusting means 44 of the present embodiment is controlled so as to keep the liquid level within a certain range, but the present invention is not limited to this, and even if the liquid level is controlled to be maintained above a certain level. Good. That is, when it is detected that the liquid level in the slurry tank 40 is lower than a certain liquid level (lower limit value), water may be supplied to the slurry tank 40. Further, water may be constantly supplied, and water exceeding the upper limit value may be recovered by the overflow pipe 54. That is, the liquid level may be maintained at the liquid level at which the liquid is recovered by the overflow pipe 54. In addition, the structure which always supplies water in this way supplies water excessively, and energy efficiency falls.

  In the present embodiment, water is used as the liquid for making the slag into a slurry form, but any liquid other than water may be used as long as it is a liquid.

  As described above, the slag discharge system according to the present invention is useful for discharging slag, and is particularly suitable for cooling slag generated in a combustion furnace and discharging it to a predetermined position.

DESCRIPTION OF SYMBOLS 12 Gasification furnace 13 Molten slag 14 Slag hopper 16 On-off valve 18 Transport vehicle 19 Granulated slag 20 Slag discharge system 22 Slag lock hopper 26 Slag reservoir 26a Slag reservoir tank 26b Slag conveyor 28 Slag conveyor 30 Slag storage tank 32 Discharge port 40 Slurry Tank 41 Slag slurry 42 Transport pipe 43 Slag slurry pump 44 Liquid level adjustment means 50 Water storage tank 51 Supply pipe 52 Water supply pump 53 Circulation pipe 54 Overflow pipe 56 On-off valve 58 Level meter 60 Liquid level control unit 62 Recovery pipe 63a, 63b Water receiver Numeral 101 Main body 106 Filter 201 Weight measuring device 202 Control means

Claims (5)

A slag lock hopper for temporarily storing granulated slag supplied from the slag hopper;
A slag reservoir in which a predetermined amount of granulated slag is dropped from the bottom of the slag lock hopper via an on-off valve, and cooled and stored;
A slurry tank for storing granulated slag and slurry water discharged from the slag reservoir via a slag conveyor;
A slag slurry transport unit having a slag slurry pump for transporting the slag slurry slurried in the slurry tank;
A slag storage tank that separates and discharges slurry water from the slag slurry transported from the slag slurry transport unit and stores the granulated slag;
A recovery unit for recovering the drained water separated and discharged from the slag storage tank and supplying it to the slurry tank;
A detector for detecting the amount of slag of granulated slag that falls into or is discharged from the slag reservoir;
When the amount of slag from the slag lock hopper is equal to or less than a predetermined value as a result of detection by the detection device, when the discharge of the granulated slag from the slag reservoir is completed by the slag conveyor, the load of the slag slurry pump is reduced. A slag discharge system characterized by performing control to be changed. In claim 1,
When the supply of the granulated slag from the slag lock hopper is resumed to the slag reservoir, control is performed to change the load of the slag slurry pump to normal. In claim 1 or 2,
From the weight measuring device which measures the weight of a slag reservoir tank, or the weight measuring device which is provided in a slag reservoir tank and which measures the weight on the slag conveyor which discharges granulated slag outside, or the slag conveyor A slag discharge system, wherein the slag discharge system is at least one concentration meter that detects a falling slag concentration. A slag lock hopper for temporarily storing granulated slag supplied from the slag hopper;
A slag reservoir in which a predetermined amount of granulated slag is dropped from the bottom of the slag lock hopper via an on-off valve, and cooled and stored;
A slurry tank for storing granulated slag and slurry water discharged from the slag reservoir via a slag conveyor;
A slag slurry transport unit having a slag slurry pump for transporting the slag slurry slurried in the slurry tank;
A slag storage tank that separates and discharges slurry water from the slag slurry transported from the slag slurry transport unit and stores the granulated slag;
A recovery unit for recovering the drained water separated and discharged from the slag storage tank and supplying it to the slurry tank;
Using a slag discharge system comprising a detection device that detects the amount of slag of granulated slag that falls into the slag reservoir or is discharged from the slag reservoir,
As a result of detection by the detection device, when the amount of slag from the slag lock hopper is a predetermined value or less, when the discharge of the granulated slag from the slag reservoir by the slag conveyor is completed, the load of the slag slurry pump is reduced. A method for operating a slag discharge system, characterized in that the slurry water is changed and fed to a slag storage tank. In claim 4,
When the supply of the granulated slag from the slag lock hopper to the slag reservoir is resumed, control is performed to change the load of the slag slurry pump to normal.

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