JP6929649B2 - How to operate slag discharge system, gasification furnace equipment, gasification combined power generation equipment, and slag discharge system - Google Patents

Description

The present invention relates to an operation method of a slag emission system, a gasification furnace facility, a gasification combined power generation facility, and a slag emission system applicable to a gasification furnace for gasifying a carbon-containing solid fuel such as coal.

In a gasification furnace that produces flammable gas by partially burning biomass fuel such as coal and wood pellets and carbon-containing solid fuel such as pet cork, the ash content of the carbon-containing solid fuel melts and becomes slag in the gasification furnace. It is deposited on the slug hopper provided below. Slag water (cooling water) is stored in the slag hopper, and the slag is solidified and crushed by falling into the slag water and being rapidly cooled.

The slag that has been solidified and crushed in this way and accumulated in the slag hopper is discharged to the outside of the gasification furnace system via the lock hopper provided outside the gasification furnace. Since slag has a higher density than slag water, conventionally, when moving slag from a slag hopper to a rock hopper, it was naturally dropped by gravity. For example, Patent Document 1 discloses a slag discharge system in which a lock hopper is arranged below a gasifier.

However, according to the above-mentioned slag discharge system, when the slag is naturally dropped by gravity, the position of the gasifier is increased because the lock hopper is provided on the vertically lower side of the gasifier. Therefore, the height from the installation surface of the plant to the upper part of the gasifier will increase. As the arrangement position of the gasifier becomes higher, the arrangement position of the support pedestal and the operation pedestal for supporting the gasifier becomes higher, and there is a problem that the cost required for the installation work of the gasifier becomes higher.

Therefore, a slag discharge system as disclosed in Patent Document 2 has been proposed. In this slag discharge system, the lock hopper is placed on the side of the gasifier, a slag discharge line that connects the slag hopper to the lock hopper is provided, and a circulation pump forms a water flow from the slag hopper to the lock hopper in the slag discharge line. However, this water flow discharges the slag in the slag hopper to the lock hopper.

By doing so, the slag can be transferred from the slag hopper to the lock hopper on the flow of slag water, so that the lock hopper can be arranged on the side of the gasification furnace and gasified from the installation surface of the plant. The height to the top of the furnace can be kept low.

Japanese Unexamined Patent Publication No. 2011-74274 Japanese Patent No. 5743093

In the slag discharge system disclosed in Patent Document 2, since the lock hopper is arranged on the side of the gasifier, it is necessary to form a water flow in a line that guides the slag from the bottom of the gasifier to the top of the lock hopper. .. Therefore, when the gasifier is started, it is necessary to fill the line leading the slag to the upper part of the lock hopper with water.
However, when the water system was filled with water before the start of the gasifier or at the time of start-up, the pressure inside the gasifier was not sufficiently pressurized, and the slag was extended to the upper part of the lock hopper of the gasifier. Since there is a head difference between the lock hopper water level when the leading line is filled with water and the slag discharge facility level, the combustion part (combustor part, reducer part) of the gasifier before filling the slag leading line. The water held by the water system will flow into the main parts such as, etc., causing problems.

The present invention has been made in view of such circumstances, and guides slag from the slag hopper to the slag separator at the time of starting the gasifier while preventing the height position to the upper part of the gasifier from becoming higher. It is an object of the present invention to provide an operation method of a slag discharge system, a gasification furnace facility, a gasification complex power generation facility, and a slag discharge system capable of filling a slag discharge line with cooling water.

In order to solve the above problems, the slag discharge system according to one aspect of the present invention employs the following means.
The slag discharge system according to one aspect of the present invention is provided vertically below the gasifier for gasifying the carbon-containing solid fuel, receives the slag generated from the carbon-containing solid fuel, and cools the slag. A slag hopper in which water is stored, a slag separation device that separates the slag from a mixture of the slag and the cooling water, a slag discharge line that guides the mixture from the slag hopper to the slag separation device, and the slag separation device. A cooling water circulation line that returns the separated cooling water to the slag hopper, a circulation pump that forms a water flow from the slag hopper to the slag separator, and a cooler arranged on the downstream side of the circulation pump of the cooling water circulation line. A first on-off valve that is arranged in the slag discharge line and switches between a distribution state in which the mixture flows and a shutoff state in which the flow of the mixture is blocked, and a cooling water circulation line and the cooling water are arranged. A second on-off valve for switching between a flowing state and a shut-off state for shutting off the flow of the cooling water is provided, and the first position in the vertical direction in which the first on-off valve is arranged and the second on-off valve are arranged. than the second position in the vertical direction to be, the Ri is a high position near the third position in the vertical direction downstream end is arranged in the slag discharge line supplying the mixture to the slag separation device, said first position and the second location, Ru located der lower than the vertical position of the combustion section of the gasification furnace are disposed.

According to the slag discharge system according to one aspect of the present invention, the first position in the vertical direction at the downstream end of the slag discharge line from the first position where the first on-off valve is arranged and the second position where the second on-off valve is arranged. Since the three positions are high, it is possible to prevent the height position up to the upper part of the gasifier from being higher than when the slag separator is installed vertically below the gasifier.

Further, since the third position in the vertical direction at the downstream end of the slag discharge line is higher than the first position and the second position, the slag discharge line is closed by closing both the first on-off valve and the second on-off valve. Is separated into the upstream side and the downstream side of the first on-off valve, and the cooling water circulation line is separated into the upstream side and the downstream side of the second on-off valve. The upstream side of the slag discharge line and the downstream side of the cooling water circulation line are low head systems whose vertical positions are lower than those of the first and second positions, and the downstream side of the slag discharge line and the upstream side of the cooling water circulation line. Is a high head system in which the vertical position is higher than the first and second positions.

Since the line through which the cooling water circulates is separated into the low-head system and the high-head system by the first on-off valve and the second on-off valve, water can be injected independently into the low-head system and the high-head system, respectively. can. Therefore, even if water is injected into the high head system and filled with cooling water up to the third position in the vertical direction where the downstream end of the slag discharge line is located, it is separated from the low head system, so it goes to the high head system. The water injection does not flow into the main parts such as the combustion part (combustor part, reducer part) of the gasifier. Therefore, when the gasifier is started, the slag discharge line that guides the slag from the slag hopper to the slag separator can be filled with cooling water.

The slag discharge system of the above aspect includes a bypass line that guides a part of the cooling water stored in the slug hopper to the cooling water circulation line on the upstream side of the circulation pump on the downstream side of the second on-off valve. The circulation pump may be arranged in the cooling water circulation line on the downstream side of the position where the cooling water is guided from the bypass line to the cooling water circulation line.

According to the slag discharge system having the above configuration, even when the gasifier in which the low head system and the high head system are separated is started, the circulation pump is operated to bypass the cooling water stored in the slag hopper. Can be circulated through. Therefore, the cooling water stored in the slag hopper can be circulated even when the gasification furnace is started. Further, for example, during normal operation after the gasification furnace is started, even if an abnormality occurs in the slag separator or the like and the cooling water cannot be circulated to the high head system, the gasification furnace is stopped. The operation can be continued without any problem.

In the slag discharge system having the above configuration, the vertical position of the discharge port for guiding the cooling water from the slag hopper to the bypass line may be higher than the upstream end of the slag discharge line.
By doing so, when an abnormality occurs in the slag separation device and the slag cannot be discharged from the slag hopper, the cooling water is guided to the bypass line from a position away from the upstream end of the slag discharge line. Therefore, it is possible to suppress the discharge of slag to a bypass system that does not have a facility for separating slag.

In the slag discharge system of the above aspect, the first on-off valve and the second on-off valve are provided with a control unit for controlling the open / closed state of the first on-off valve and the first on-off valve before the control unit starts the gasification furnace. The valve and the second on-off valve may be controlled to be closed.
By doing so, before starting the gasifier, the slag discharge line is separated into the upstream side and the downstream side of the first on-off valve, and the cooling water circulation line is separated into the upstream side and the downstream side of the second on-off valve. It is possible to inject water independently into the low head system and the high head system.

The slag discharge system having the above configuration includes a pressure detection unit that detects the pressure inside the gasification furnace, and the control unit is said to be the first when the pressure detected by the pressure detection unit becomes equal to or higher than a predetermined pressure. 1 The on-off valve and the second on-off valve may be controlled to be in the open state.
By doing so, the low-head system and the high-head system can be connected according to the pressure of the low-head system being equal to or greater than the head difference from the high-head system. As a result, the slag generated by starting the gasifier can be discharged from the slag hopper, and the slag can be separated by the slag separator.

The gasification furnace equipment according to one aspect of the present invention includes a gasification furnace that partially burns a carbon-containing solid fuel to gasify it, and the slag discharge system according to any one of the above.
According to the gasifier equipment according to one aspect of the present invention, the height to the upper part of the gasifier is kept low, and the slag discharge line that guides the slag from the slag hopper to the slag separator at the time of starting the gasifier is cooled by the cooling water. Can be filled with.

The gasification combined power generation facility according to one aspect of the present invention includes a gasification furnace that partially burns a carbonaceous solid fuel to gasify it, the slag emission system according to any one of the above, and gas by the gasification furnace. A generator that generates power from the gasified solid fuel containing carbon is provided.
According to the gasification combined power generation facility according to one aspect of the present invention, the slag discharge line that guides the slag from the slag hopper to the slag separator is cooled at the time of starting the gasification furnace while keeping the height to the upper part of the gasification furnace low. It can be filled with water.

The method of operating the slag discharge system according to one aspect of the present invention is provided below a gasifier that partially burns and gasifies the carbon-containing solid fuel, receives the slag generated from the carbon-containing solid fuel, and the slag. A slag hopper in which cooling water for cooling the slag is stored, a slag separator that separates the slag from a mixture of the slag and the cooling water, and a slag discharge line that guides the mixture from the slag hopper to the slag separator. a cooling water circulation line for returning the cooling water separated in the slag separation device in the slag hopper, and a circulation pump to form a water flow to the slag separation device from the slag hopper, cooling for cooling the cooling water of the cooling water circulation line The vessel, a first on-off valve arranged in the slag discharge line and switching between a distribution state in which the mixture flows and a shutoff state in which the flow of the mixture is blocked, and a first on-off valve arranged in the cooling water circulation line and the cooling water. A method of operating a slag discharge system including a second on-off valve for switching between a flow state in which the slag flows and a shut-off state in which the flow of the cooling water is cut off. The first position and the second position in the vertical direction in which the second on-off valve is arranged are higher than the bottom of the slag hopper, and the mixture is supplied to the slag separator from the first position and the second position. The third position in the vertical direction where the downstream end of the slag discharge line is arranged is at a high position, and the first position and the second position are higher than the positions in the vertical direction where the combustion part of the gasifier is arranged. also a low position, before starting the gasification furnace, the first on-off valve and said the blocking step and a second on-off valve in the closed state, the first to the said shut-off step-off valve and the second The first water injection that injects the cooling water to the upstream side of the first on-off valve of the slag discharge line and the downstream side of the second on-off valve of the cooling water circulation line with the on-off valve closed. With the first on-off valve and the second on-off valve closed by the step and the shut-off step, the slag discharge line is downstream of the first on-off valve and the cooling water circulation line is the first. 2 After the second water injection step of injecting the cooling water upstream of the on-off valve and the water injection by the first water injection step and the second water injection step, the pressure in the gasification furnace is equal to or higher than the predetermined pressure. It is provided with a pressure confirmation step for confirming that the above is true, and a connection step for opening the first on-off valve and the second on-off valve.

According to the operation method of the slag discharge system according to one aspect of the present invention, a slag discharge line that guides slag from the slag hopper to the slag separator at the time of starting the gasifier is provided while keeping the height to the upper part of the gasifier low. It can be filled with cooling water.

A slag discharge system, gas that enables the slag discharge line that guides slag from the slag hopper to the slag separator to be filled with cooling water when the gasifier is started, while keeping the height position up to the top of the gasifier. It is possible to provide a method of operating a gasification furnace facility, a gasification complex power generation facility, and a slag emission system.

It is a schematic block diagram of the coal gasification combined cycle equipment to which the gasification furnace equipment which concerns on 1st Embodiment of this invention is applied. It is a schematic block diagram of the gasification furnace equipment shown in FIG. It is a flowchart which shows the operation method at the time of starting of the gasification furnace equipment shown in FIG. It is a schematic block diagram of the gasification furnace equipment which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the operation method at the time of starting of the gasification furnace equipment shown in FIG.

Hereinafter, an embodiment of the gasification furnace facility (slag discharge system) according to the present invention will be described with reference to the drawings.
[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of an integrated coal gasification combined cycle facility 10 to which the gasification furnace facility 14 according to the first embodiment is applied.

The integrated coal gasification combined cycle (IGCC) 10 to which the gasification combined cycle equipment 14 according to the present embodiment is applied uses air as an oxidizing agent, and in the gasification furnace equipment 14, from fuel. It uses an air combustion method that produces flammable gas (produced gas). Then, the integrated coal gasification combined cycle facility 10 purifies the generated gas generated by the gasification combined cycle facility 14 into a fuel gas by the gas refining facility 16 and then supplies the gas to the gas turbine 17 to generate power. That is, the integrated coal gasification combined cycle facility 10 of the present embodiment is an air combustion type (air blown) power generation facility. As the fuel to be supplied to the gasifier facility 14, for example, a carbon-containing solid fuel such as coal is used.

As shown in FIG. 1, the integrated coal gasification combined cycle facility (gasification combined cycle facility) 10 includes a coal supply facility 11, a gasification furnace facility 14, a char recovery facility 15, a gas purification facility 16, and a gas turbine. It includes 17, a steam turbine 18, a generator 19, and a heat recovery steam generator (HRSG) 20.

The coal supply facility 11 supplies coal, which is a carbon-containing solid fuel, as raw coal, and crushes the coal with a coal mill (not shown) to produce pulverized coal pulverized into fine particles. The pulverized coal produced in the coal supply facility 11 is pressurized by nitrogen gas as a transport inert gas supplied from the air separation facility 42, which will be described later, at the outlet of the coal supply line 11a, and is directed to the gasifier facility 14. Will be supplied. The inert gas is an inert gas having an oxygen content of about 5% by volume or less, and nitrogen gas, carbon dioxide gas, argon gas and the like are typical examples, but the inert gas is not necessarily limited to about 5% or less.

The gasifier facility 14 is supplied with pulverized coal produced by the coal supply facility 11, and the char (unreacted coal and ash) recovered by the char recovery facility 15 is returned and supplied for reuse. Has been done.

Further, a compressed air supply line 41 from the gas turbine 17 (compressor 61) is connected to the gas turbine equipment 14, and a part of the compressed air compressed by the gas turbine 17 is pressed by the booster 68 at a predetermined pressure. It is possible to supply the gas to the gasifier equipment 14 by increasing the pressure. The air separation facility 42 separates and generates nitrogen and oxygen from the air in the atmosphere, and the air separation facility 42 and the gasifier facility 14 are connected by a first nitrogen supply line 43. A coal supply line 11a from the coal supply facility 11 is connected to the first nitrogen supply line 43.

A second nitrogen supply line 45 branching from the first nitrogen supply line 43 is also connected to the gasifier facility 14, and the second nitrogen supply line 45 has a char return line 46 from the char recovery facility 15. It is connected. Further, the air separation equipment 42 is connected to the compressed air supply line 41 by an oxygen supply line 47. Then, the nitrogen separated by the air separation equipment 42 is used as a transport gas for coal or char by flowing through the first nitrogen supply line 43 and the second nitrogen supply line 45. Further, the oxygen separated by the air separation facility 42 is used as an oxidant in the gasifier facility 14 by flowing through the oxygen supply line 47 and the compressed air supply line 41.

The gasifier equipment 14 includes, for example, a two-stage jet bed type gasifier 101 (see FIG. 2). The gasification furnace facility 14 gasifies the coal (pulverized coal) and char supplied to the inside by partially burning them with an oxidizing agent (air, oxygen) to obtain a produced gas. The gasifier facility 14 is provided with a foreign matter removing facility 48 for removing foreign matter (molten slag (hereinafter, also simply referred to as slag)) mixed in the pulverized coal. A gas generation line 49 for supplying the generated gas to the char recovery equipment 15 is connected to the gasifier facility 14, so that the generated gas containing the char can be discharged. In this case, as shown in FIG. 2, by providing a thin gas cooler 102 (gas cooler) in the gas generation line 49, the generated gas may be cooled to a predetermined temperature and then supplied to the char recovery equipment 15.

The char collecting facility 15 includes a dust collecting device 51 and a supply hopper 52. In this case, the dust collecting facility 51 is composed of one or more cyclones or porous filters, and can separate the char contained in the generated gas generated by the gasifier facility 14. Then, the generated gas from which the char is separated is sent to the gas refining facility 16 through the gas discharge line 53. The supply hopper 52 stores the char separated from the generated gas by the dust collector 51. A bin may be arranged between the dust collector 51 and the supply hopper 52, and a plurality of supply hoppers 52 may be connected to the bin. Then, the char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

The gas refining facility 16 purifies the produced gas from which the char is separated by the char recovery facility 15 by removing impurities such as sulfur compounds and nitrogen compounds. Then, the gas refining facility 16 purifies the produced gas to produce a fuel gas, and supplies the fuel gas to the gas turbine 17. Since the char is still contained sulfur content in the product gas separated (such as H 2 _S) is, in the gas purification equipment 16 removes recovering sulfur by such amine absorbent, effective use do.

The gas turbine 17 includes a compressor 61, a combustor 62, and a turbine 63, and the compressor 61 and the turbine 63 are connected by a rotating shaft 64. A compressed air supply line 65 from the compressor 61 is connected to the combustor 62, a fuel gas supply line 66 from the gas refining facility 16 is connected to the combustor 62, and a combustion gas supply line 67 extending toward the turbine 63 is connected. Is connected. Further, the gas turbine 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the gasifier equipment 14, and a booster 68 is provided in the middle of the gas turbine 17. Therefore, in the combustor 62, a part of the compressed air supplied from the compressor 61 and at least a part of the fuel gas supplied from the gas refining facility 16 are mixed and burned to generate and burn the combustion gas. The generated combustion gas is supplied to the turbine 63. Then, the turbine 63 rotationally drives the generator 19 by rotationally driving the rotary shaft 64 with the supplied combustion gas.

The steam turbine 18 includes a turbine 69 connected to a rotating shaft 64 of the gas turbine 17, and a generator 19 is connected to a base end portion of the rotating shaft 64. The exhaust heat recovery boiler 20 is connected to an exhaust gas line 70 from a gas turbine 17 (turbine 63), and generates steam by exchanging heat between the water supply and the exhaust gas of the turbine 63. The exhaust heat recovery boiler 20 is provided with a steam supply line 71 and a steam recovery line 72 between the exhaust heat recovery boiler 20 and the turbine 69 of the steam turbine 18, and a condenser 73 is provided on the steam recovery line 72. Further, the steam generated by the exhaust heat recovery boiler 20 may include steam generated by heat exchange with the generated gas in the thin gas cooler 102 of the gasification furnace 101. Therefore, in the steam turbine 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 is rotationally driven by rotating the rotary shaft 64.

A gas purification facility 74 is provided from the outlet of the exhaust heat recovery boiler 20 to the chimney 75.
Here, the operation of the integrated coal gasification combined cycle facility 10 of the present embodiment will be described.

In the integrated coal gasification combined cycle facility 10 of the present embodiment, when raw coal (coal) is supplied to the coal supply facility 11, the coal is pulverized into fine particles in the coal supply facility 11 to become pulverized coal. .. The pulverized coal produced in the coal supply facility 11 is supplied to the gasifier facility 14 through the first nitrogen supply line 43 by the nitrogen supplied from the air separation facility 42. Further, the char recovered by the char recovery facility 15 described later is circulated through the second nitrogen supply line 45 by the nitrogen supplied from the air separation facility 42 and supplied to the gasifier facility 14. Further, the compressed air extracted from the gas turbine 17 described later is boosted by the booster 68, and then supplied to the gasifier equipment 14 through the compressed air supply line 41 together with the oxygen supplied from the air separation equipment 42.

In the gasification furnace facility 14, the supplied pulverized coal and char are burned by compressed air (oxygen), and the pulverized coal and char are gasified to generate a generated gas. Then, this generated gas is discharged from the gasification furnace facility 14 through the gas generation line 49 and sent to the char recovery facility 15.

In the char recovery equipment 15, the generated gas is first supplied to the dust collecting equipment 51, so that the fine chars contained in the generated gas are separated. Then, the generated gas from which the char is separated is sent to the gas refining facility 16 through the gas discharge line 53. On the other hand, the fine char separated from the generated gas is deposited on the supply hopper 52, returned to the gasifier facility 14 through the char return line 46, and recycled.

The generated gas from which the char is separated by the char recovery facility 15 is gas refined by removing impurities such as sulfur compounds and nitrogen compounds in the gas refining facility 16 to produce a fuel gas. The compressor 61 generates compressed air and supplies it to the combustor 62. The combustor 62 produces combustion gas by mixing compressed air supplied from the compressor 61 and fuel gas supplied from the gas refining facility 16 and burning them. By rotationally driving the turbine 63 with this combustion gas, the compressor 61 and the generator 19 are rotationally driven via the rotating shaft 64. In this way, the gas turbine 17 can generate electricity.

Then, the exhaust heat recovery boiler 20 generates steam by exchanging heat between the exhaust gas discharged from the turbine 63 in the gas turbine 17 and the water supply, and supplies the generated steam to the steam turbine 18. In the steam turbine 18, the turbine 69 is rotationally driven by the steam supplied from the exhaust heat recovery boiler 20, so that the generator 19 can be rotationally driven via the rotating shaft 64 to generate electricity.
The gas turbine 17 and the steam turbine 18 do not have to be rotationally driven by one generator 19 as the same axis, and a plurality of generators may be rotationally driven as different axes.

After that, the gas purification facility 74 removes harmful substances in the exhaust gas discharged from the exhaust heat recovery boiler 20, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

Next, with reference to FIG. 2, the gasifier equipment 14 shown in FIG. 1 will be described in detail.
As shown in FIG. 2, the gasifier equipment 14 of the present embodiment includes a gasifier 101, a foreign matter removal equipment 48, a slag discharge line 140, a cooling water circulation line 150, a circulation pump 160, and a cooler 170. A first on-off valve 180, a second on-off valve 190, and a control unit 90 are provided.
Hereinafter, each configuration included in the gasifier equipment 14 will be described.

Here, in each of the devices shown in FIG. 2, other configurations (foreign matter removal equipment 48, slag discharge line 140, cooling water circulation line 150, circulation pump 160, cooler) other than the gasifier 101 included in the gasifier equipment 14 170, the first on-off valve 180, the second on-off valve 190, the control unit 90) are the slag discharge systems of the present embodiment. The gasifier equipment of the present embodiment includes a gasifier 101 and a slag discharge system.

The gasifier 101 is formed so as to extend in the vertical direction (direction extending upward along the axis X orthogonal to the installation surface S), and pulverized coal and oxygen are supplied to the lower side in the vertical direction to partially burn (partial combustion (). The generated gas gasified by thermal decomposition) flows from the lower side to the upper side in the vertical direction. The gasifier 101 has a pressure vessel 110 and a gasifier wall (furnace wall) 111 provided inside the pressure vessel 110. The gasifier 101 forms an annulus portion 115 in the space between the pressure vessel 110 and the gasifier wall 111. Further, in the space inside the gasification furnace wall 111, the gasifier 101 has a convertor portion 116, a diffuser portion 117, and a reducer portion 118 in this order from the lower side in the vertical direction (that is, the upstream side in the distribution direction of the generated gas). Is forming.

The pressure vessel 110 is formed in a tubular shape having a hollow space inside, and a gas discharge port 121 is formed at the upper end portion, while a slug hopper 122 is formed at the lower end portion (bottom portion). The gasification furnace wall 111 is formed in a tubular shape having a hollow space inside, and the wall surface thereof is provided so as to face the inner surface of the pressure vessel 110. In the present embodiment, the pressure vessel 110 is formed in a cylindrical shape, and the diffuser portion 117 of the gasification furnace wall 111 is also formed in a cylindrical shape. The gasification furnace wall 111 is connected to the inner surface of the pressure vessel 110 by a support member (not shown).

The gasification furnace wall 111 has a shape in which the cross-sectional shape changes at the diffuser portion 117 between the convertor portion 116 and the reducer portion 118. The upper end of the gasifier wall 111 in the vertical direction is connected to the gas discharge port 121 of the pressure vessel 110, and the lower end in the vertical direction is provided with a gap from the bottom of the pressure vessel 110. Cooling water (reservoir) is stored in the slug hopper 122 formed below the pressure vessel 110, and the lower end of the gasification furnace wall 111 is flooded with the cooling water to cause the gasification furnace wall 111 to be flooded. The inside and outside are sealed. A burner 126 and a burner 127 are inserted into the gasification furnace wall 111, and a thin gas cooler 102 is arranged in the internal space of the gasification furnace wall 111.

The annulus portion 115 is a space formed inside the pressure vessel 110 and outside the gasification furnace wall 111, and in the present embodiment, nitrogen, which is an inert gas separated by the air separation equipment 42, is introduced into the nitrogen supply line ( It is supplied through (not shown). Therefore, the annulus portion 115 becomes a space filled with nitrogen. An in-core pressure equalizing pipe (not shown) for equalizing the pressure inside the gasification furnace 101 is provided near the upper portion of the annulus portion 115 in the vertical direction. The pressure equalizing pipe in the furnace is provided so as to communicate the inside and outside of the gasification furnace wall 111, and the pressure between the inside (combustor portion 116, diffuser portion 117 and reducer portion 118) and the outside (annulus portion 115) of the gasification furnace wall 111. The pressure is approximately equalized so that the difference is within a predetermined pressure.

The pressure sensor 128 is a sensor that detects the pressure of the annulus portion 115 inside the gasification furnace 101. The pressure detected by the pressure sensor 128 is transmitted to the control unit 90, which will be described later.

The combustor section 116 is a space for partially burning pulverized coal, char, and air, and a combustion device composed of a plurality of burners 126 is arranged on the gasification furnace wall 111 of the combustor section 116. The high-temperature combustion gas obtained by burning the pulverized coal and a part of the char in the convertor section 116 passes through the diffuser section 117 and flows into the reducer section 118.

The reducer section 118 is maintained at a high temperature state required for the gasification reaction, supplies pulverized coal to the combustion gas from the convertor section 116 and partially burns the pulverized coal to volatile components (carbon monoxide, hydrogen, lower hydrocarbons, etc.). ), Which is a space to generate gasified generated gas. A combustion device composed of a plurality of burners 127 is arranged on the gasification furnace wall 111 of the reducer unit 118.

The slag hopper 122 is a device provided vertically below the gasifier 101 to receive slag (molten slag) generated in high-temperature gas by combustion of pulverized coal and char, and to store cooling water for cooling the slag. be. The slag is solidified and crushed by falling into the cooling water stored in the slag hopper 122 and being rapidly cooled. The crushed slag accumulates in the bottom 122A of the slag hopper 122.

The thin gas cooler 102 is provided inside the gasification furnace wall 111, and is provided above the burner 127 of the reducer portion 118 in the vertical direction. The thin gas cooler 102 is a heat exchanger, and the evaporator (evaporator) 131, the superheater (superheater) 132, and the nodes are in order from the lower side in the vertical direction (upstream side in the flow direction of the generated gas) of the gasification furnace wall 111. A coal device (economizer) 134 is arranged. These thin gas coolers 102 cool the generated gas by exchanging heat with the generated gas generated in the reducer portion 118. Further, the number of the evaporator (evaporator) 131, the superheater (superheater) 132, and the economizer (economizer) 134 is not limited to the quantity shown in the figure.

Here, the operation of the gasification furnace 101 described above will be described.
In the gasification furnace 101, nitrogen and pulverized coal are charged and ignited by the burner 127 of the reducer portion 118, and pulverized coal, char and compressed air (oxygen) are charged and ignited by the burner 126 of the convertor portion 116. .. Then, in the convertor portion 116, high-temperature combustion gas is generated by combustion of pulverized coal and char. Further, in the convertor portion 116, molten slag is generated in high temperature gas by combustion of pulverized coal and char, and the molten slag adheres to the gasification furnace wall 111 and falls to the bottom of the furnace, and finally in the slag hopper 122. It is discharged to the cooling water of. Then, the high-temperature combustion gas generated in the converter section 116 rises to the reducer section 118 through the diffuser section 117. In this reducer unit 118, the pulverized coal is maintained at the high temperature state required for the gasification reaction, and the pulverized coal is mixed with the high temperature combustion gas, and the pulverized coal is partially burned (pyrolyzed) in a high temperature reducing atmosphere to gasify. The reaction takes place and the produced gas is produced. The gasified generated gas flows from the lower side in the vertical direction to the upper side.

The foreign matter removing facility 48 is a facility that removes slag mixed from a mixture of slag and cooling water discharged from the slag hopper 122 by the slag discharge line 140, and stores the cyclone (slag separator) 48A, the lock hopper 48B, and the storage. A tank 48C, a sluice valve 48D, a first discharge valve 48E, and a second discharge valve 48F are provided.

The cyclone 48A is a device that separates slag from a mixture of slag and cooling water by centrifugal force. Instead of the cyclone 48A, a filtration type slag separator such as a strainer or a filter may be used. The cyclone 48A separates the slag from the mixture supplied from the slag discharge line 140, which will be described later, to the intake port 48Aa, and guides the slag downward. Further, the cyclone 48A separates the cooling water from the mixture of the slag and the cooling water, and discharges the cooling water from the discharge port 48Ab to the cooling water circulation line 150 described later.

The lock hopper 48B is a hopper that stores a predetermined amount of slag separated by the cyclone 48A. The slag separated by the cyclone 48A is supplied to the lock hopper 48B when the sluice valve 48D is in the open state. When slag is accumulated in the lock hopper 48B in a predetermined amount or for a predetermined period, the sluice valve 48D is closed, and the first discharge valve 48E is opened after the depressurization operation is performed. The slag stored in the lock hopper 48B falls into the storage tank 48C by gravity in response to the opening of the first discharge valve 48E.

The storage tank 48C is a device that receives and stores the slag stored in the lock hopper 48B and discharges the stored slag to the transport vehicle C. The slag stored in the storage tank 48C is discharged to the transport vehicle C when the second discharge valve 48F is in the open state. The slag discharged to the transport vehicle C is transported to the outside of the gasifier equipment 14.

The slag discharge line 140 is a pipe that guides a mixture of slag and cooling water from the bottom 122A of the slag hopper 122 to the cyclone 48A. The slag discharge line 140 is provided with a first on-off valve 180 that switches between a distribution state in which the mixture flows and a shutoff state in which the flow of the mixture is blocked.
The slag discharge line 140 is arranged on the upstream side slag discharge line 140A arranged on the upstream side of the first on-off valve 180 in the flow direction of the mixture and on the downstream side of the first on-off valve 180 in the flow direction of the mixture. It has a downstream slag discharge line 140B.

At the upstream end of the upstream slag discharge line 140A, an intake port 141 arranged in the vicinity of the bottom portion 122A of the slag hopper 122 is provided. The slag accumulated in the bottom portion 122A of the slag hopper 122 flows into the upstream slag discharge line 140A from the intake port 141 together with the surrounding cooling water by the action of the water flow generated by the circulation pump 160 described later. The mixture of slag and cooling water discharged from the upstream slag discharge line 140A is guided to the downstream slag discharge line 140B and flows into the cyclone 48A from the intake port 48Aa.

Here, the mixture of the slag and the cooling water is not naturally dropped from the slag hopper 122 by gravity and transferred to the cyclone 48A, but is transferred by the water flow flowing through the slag discharge line 140. Therefore, the cyclone 48A can be arranged not vertically downward but on the side of the gasifier 101, and the height position of the gasifier 101 can be suppressed so as not to be high.

The cooling water circulation line 150 is a pipe that returns the cooling water separated by the cyclone 48A and discharged from the discharge port 48Ab to the slug hopper 122. The cooling water circulation line 150 includes a circulation pump 160, a cooler 170 for cooling the cooling water returned to the slug hopper 122, and a second opening / closing state for switching between a flow state in which the cooling water flows and a cutoff state in which the flow of the cooling water is blocked. A valve 190 is provided.

The circulation pump 160 is a pump that guides a mixture of slag and cooling water from the slag hopper 122 to the cyclone 48A and forms a water flow that returns the cooling water from the cyclone 48A to the slug hopper. The circulation pump 160 forms the above-mentioned water flow by operating the slag discharge line 140 and the cooling water circulation line 150 in a state where the mixture or the cooling water is filled.

The control unit 90 is a device that controls each part of the gasifier equipment 14, for example, opening / closing the first on-off valve 180, the second on-off valve 190, the sluice valve 48D, the first discharge valve 48E, and the second discharge valve 48F. Control the state. Further, the control unit 90 controls, for example, the discharge amount of the circulation pump 160.

In FIG. 2, the first position P1 shown on the axis X is a height position in the vertical direction in which the first on-off valve 180 is arranged. Further, the second position P2 shown on the axis X is a height position in the vertical direction in which the second on-off valve 190 is arranged. Further, the third position P3 shown on the axis X is a height position in the vertical direction in which the downstream end of the slag discharge line 140 that supplies the mixture to the cyclone 48A is arranged. The first position P1, the second position P2, and the third position P3 each indicate the height in the axis X direction with respect to the installation surface S. As shown in FIG. 2, the height position of the third position P3 is higher than that of the first position P1 and the second position P2.

The surface of the cooling water stored in the slag hopper 122 is cooled with the slag discharge line 140 to the upper part of the gasification furnace 101 while flooding the lower end of the gasification furnace wall 111 to seal the inside and outside of the gasification furnace wall 111. It is necessary to maintain an appropriate height so that the system holding water of the water circulation line 150 does not flow in. FIG. 2 shows a state in which the water surface of the cooling water is maintained at the position P0 during the operation of the gasifier equipment 14.

In FIG. 2, in the slag treatment system, the portion of the slag hopper 122 installed at a height position vertically below the water surface position P0 of the cooling water is the low head system L, which is vertically above the position P0. The portion installed at the height position is the high head system H.
The low head system L is a system including an upstream slag discharge line 140A and a downstream cooling water circulation line 150B. On the other hand, the high head system H is a system including a downstream slag discharge line 140B and an upstream cooling water circulation line 150A.

As shown in FIG. 2, the first position P1 in which the first on-off valve 180 is arranged and the second position P2 in which the second on-off valve 190 is arranged coincide with the water surface of the cooling water at the position P0. Therefore, the low head system L and the high head system H can be separated by closing the first on-off valve 180 and the second on-off valve 190. Therefore, as will be described later, even if the pressure inside the gasifier 101 is lower than the pressure during operation when the gasifier 101 is started, the pressures of both the low head system L and the high head system H are applied. It can be managed separately and filled independently with cooling water.

Next, the operation method at the time of starting the gasification furnace equipment 14 of the present embodiment will be described with reference to the flowchart of FIG. Each process shown in the flowchart of FIG. 3 is a process performed by the arithmetic unit included in the control unit 90 executing a program.
In the gasifier equipment 14 of the present embodiment, it is assumed that the cooling water has not been injected into either the low head system L or the high head system H pipes before the start-up. Further, it is assumed that the cooling water is not injected into the slug hopper 122 of the gasification furnace 101.

In step S301 (shutoff step), the control unit 90 closes the first on-off valve 180 (shut off state) before starting the gasification furnace 101. Further, in step S302 (stopping step), the control unit 90 closes the second on-off valve 190 before starting the gasification furnace 101. By closing the first on-off valve 180 and the second on-off valve 190 (in a shut-off state), the system including the slag discharge line 140 and the cooling water circulation line 150 is separated into a low head system L and a high head system H. NS. In addition, step S301 and step S302 may be carried out at the same time, and step S302 may be carried out earlier than step S301.

In step S303 (first water injection step), the control unit 90 starts injecting cooling water into the high head system H. Further, in step S304 (second water injection step), the control unit 90 starts injecting cooling water into the low head system L. In addition, step S303 and step S304 may be carried out at the same time, and step S304 may be carried out earlier than step S303.

In step 305, the control unit 90 starts the start-up of the gasifier 101. In the present embodiment, for example, air or an inert gas is injected into the space inside the gasification furnace wall 111 composed of the compressor section 116, the diffuser section 117, the reducer section 118, and the annulus section 115 to raise the pressure. Ignition by the starting burner (not shown) is started, and pulverized coal and compressed air are started to be charged into the burners 126 and 127. As the combustion in the combustor section 116 and the reducer section 118 of the gasification furnace 101 is promoted, the generated gas is generated, and the pressure in the gasification furnace 101 further increases.

In step 306, the control unit 90 determines whether both the low head system L and the high head system H are filled with the cooling water to complete the water injection, and if the water injection is completed, the process proceeds to step S307. ..

In step 307 (confirmation step), the control unit 90 confirms whether or not the pressure in the gasifier 101 detected by the pressure sensor 128 has increased to a predetermined pressure or higher, and when the pressure exceeds the predetermined pressure, Proceeds to step S308. At this time, as the pressure in the gasification furnace 101 rises, the pressure in the low head system L rises.
Here, the predetermined pressure means a pressure that coincides with the head difference between the low head system L and the high head system H. The head difference between the low head system L and the high head system H is the lower end position of the high head system H where the first on-off valve 180 and the second on-off valve 190 are arranged when the high-head system H is filled with cooling water. It corresponds to the water pressure at position P0).

When the pressure in the gasifier 101 detected by the pressure sensor 128 becomes equal to or higher than the predetermined pressure, the water pressure at the position P0 of the low head system L also becomes equal to or higher than the predetermined pressure. Therefore, the pressure on the low head system L side of the first on-off valve 180 is equal to or higher than the pressure on the high head system H side of the first on-off valve 180. Similarly, the pressure on the low head system L side of the second on-off valve 190 is equal to or higher than the pressure on the high head system H side of the second on-off valve 190. Therefore, even when the first on-off valve 180 and the second on-off valve 190 are opened, pressure is applied from the high head system H to the low head system L, and the water level of the cooling water stored in the slug hopper 122 does not rise. No.

In step S308 (connection step), the control unit 90 sets the first on-off valve 180 in the open state (connection state). Further, in step S309 (connection step), the control unit 90 sets the second on-off valve 190 in the open state (connection state). By opening the first on-off valve 180 and the second on-off valve 190, the low head system L and the high head system H are connected. In addition, step S308 and step S309 may be carried out at the same time.

In step S310, the control unit 90 starts the operation of the circulation pump 160 because the low head system L and the high head system H are connected to enable circulation of the cooling water. As a result, a water flow that guides the mixture of the slag and the cooling water accumulated in the bottom 122A of the slag hopper 122 to the cyclone 48A is formed. Further, a water flow is formed in which the cooling water separated by the cyclone 48A is returned to the slug hopper 122.

The operation and effect of the gasification furnace equipment 14 of the present embodiment described below will be described.
According to the gasifier equipment 14 (slag discharge system) of the present embodiment, the slag discharge line is larger than the first position P1 where the first on-off valve 180 is arranged and the second position P2 where the second on-off valve 190 is arranged. Since the vertical third position P3 at the downstream end of 140 has a high vertical height position, the height position up to the upper part of the gasifier 101 is higher than when the cyclone 48A is installed vertically below the gasifier 101. Can be suppressed so that it does not become high.

Further, since the height position of the third position P3 in the vertical direction at the downstream end of the slag discharge line 140 is higher than that of the first position P1 and the second position P2, both the first on-off valve 180 and the second on-off valve 190 are used. By closing the slag discharge line 140, the slag discharge line 140 is separated into the upstream side and the downstream side of the first on-off valve 180, and the cooling water circulation line 150 is separated into the 190 upstream side and the downstream side of the second on-off valve. The upstream side of the slag discharge line 140 and the downstream side of the cooling water circulation line 150 are low head systems L whose vertical positions are lower than those of the first and second positions, and the downstream side of the slag discharge line 140 and the cooling water circulation line. The upstream side of 150 is the high head system H whose vertical position is higher than that of the first position P1 and the second position P2.

Since the line through which the cooling water circulates is separated into the low head system L and the high head system H by the first on-off valve 180 and the second on-off valve 190, the system is divided into the low head system L and the high head system H, respectively. Water can be injected with independent pressure control. Therefore, even if water is injected into the high head system H and the area above the third position P3 in the vertical direction where the downstream end of the slag discharge line 140 is arranged is filled with cooling water, it is separated from the low head system and therefore high. By injecting water into the head system H, the cooling water does not flow into the main parts such as the combustion part (combustor part 116, reducer part 118) of the gasifier 101. Therefore, the slag discharge line 140 that guides the slag from the bottom 122A of the slag hopper 122 to the cyclone 48A can be filled with the cooling water at the time of starting the gasification furnace 101 in a low internal pressure state.

Further, the gasifier equipment 14 of the present embodiment includes a control unit 90 that controls the open / closed state of the first on-off valve 180 and the second on-off valve 190, and before the control unit 90 starts the gasifier 101. , The first on-off valve 180 and the second on-off valve 190 are controlled to be in the closed state.
By doing so, before starting the gasifier 101, the slag discharge line 140 is separated into the upstream side and the downstream side of the first on-off valve 180, and the cooling water circulation line 150 is separated on the upstream side of the second on-off valve 190. It can be separated into a side and a downstream side, and water can be injected into each of the low head system L and the high head system H in a state where the system and pressure control are independent.

Further, the gasifier equipment 14 of the present embodiment includes a pressure sensor 128 that detects the pressure inside the gasifier 101, and when the pressure detected by the pressure sensor 128 by the control unit 90 becomes equal to or higher than a predetermined pressure. The first on-off valve 180 and the second on-off valve 190 are controlled to be in the open state.
By doing so, the pressure of the low head system L rises as the internal pressure of the gasifier 101 rises, and the head difference between the low head system L and the high head system H becomes equal to or less than a predetermined value. Therefore, the low head system L and the high head system H can be connected. As a result, the slag generated by starting the gasification furnace 101 can be discharged from the slag hopper 122, and the slag can be separated by the cyclone 48A.

[Second Embodiment]
Hereinafter, the second embodiment of the present invention will be described with reference to FIGS. 4 and 5.
This embodiment is a modification of the first embodiment, and is the same as the first embodiment except for the cases described below.
The gasifier equipment 14A of the present embodiment is different from the gasifier equipment 14 of the first embodiment in that a bypass line 210 and a third on-off valve 220 are added.

As shown in FIG. 4, the bypass line 210 is a pipe that guides the cooling water stored in the slug hopper 122 to the downstream cooling water circulation line 150B arranged on the downstream side of the second on-off valve 190.
Here, as shown in FIG. 4, the circulation pump 160 of the present embodiment flows the cooling water in the cooling water circulation line 150 from the confluence position M where the cooling water is guided from the bypass line 210 to the downstream cooling water circulation line 150B. It is located on the downstream side of the direction.

Since the circulation pump 160 is arranged on the downstream side of the merging position M in the cooling water flow direction, even when the gasifier 101 in which the first on-off valve 180 and the second on-off valve 190 are closed is started. The cooling water stored in the slug hopper 122 can be circulated. That is, by operating the circulation pump 160, the cooling water can be circulated in the order of the slug hopper 122, the bypass line 210, the downstream cooling water circulation line 150B, the circulation pump 160, the cooler 170, and the slug hopper 122.
Further, not only at the time of starting, for example, during normal operation after the gasification furnace 101 is started, some abnormality occurs in the cyclone 48A or the like and the circulation of the cooling water is stopped in the high head system H. However, since the cooling water is circulated while being cooled by the cooler 170, the operation can be continued without stopping the gasifier 101.

The control unit 90 of the gasifier equipment 14A of the present embodiment opens the third on-off valve 220 and the first on-off valve 180 when the first on-off valve 180 and the second on-off valve 190 are closed. And when the second on-off valve 190 is opened, the third on-off valve 220 is closed. By doing so, when the high head system H and the low head system L are cut off, the cooling water is circulated using the bypass line 210, and the high head system H and the low head system L are connected. In some cases, the circulation of the cooling water using the bypass line 210 can be prevented.

Further, in the present embodiment, the vertical position of the discharge port 210A for guiding the cooling water from the slag hopper 122 to the bypass line 210 is higher than the intake port 141 arranged at the upstream end of the slag discharge line 140.
By doing so, when an abnormality occurs in the cyclone 48A or the like and the slag cannot be discharged from the slag hopper 122, the cooling water is guided to the bypass line 210 from a position away from the upstream end of the slag discharge line 140. Therefore, it is possible to suppress the discharge of slag to a system having a bypass line 210 that does not have a facility for separating slag.

Next, the operation method at the time of starting the gasifier equipment 14A of the present embodiment will be described with reference to the flowchart of FIG. Each process shown in the flowchart of FIG. 5 is a process performed by the arithmetic unit included in the control unit 90 executing a program.
Since each process of steps S501 to 506 of the flowchart of FIG. 5 is the same as each process of steps S301 to S306 of the flowchart of FIG. 3 of the first embodiment, the description thereof will be omitted.
Further, since each process of steps S508 to 510 of the flowchart of FIG. 5 is the same as each process of steps S307 to S309 of the flowchart of FIG. 3 of the first embodiment, the description thereof will be omitted.

In the first embodiment, the operation of the circulation pump 160 is started after the first on-off valve 180 and the second on-off valve 190 are opened. On the other hand, in the present embodiment, the operation of the circulation pump 160 is started before the first on-off valve 180 and the second on-off valve 190 are opened.
As shown in FIG. 5, in step S507, the control unit 90 starts the operation of the circulation pump 160 in a state where the low head system L and the high head system H are cut off. As a result, a water flow is formed in which the cooling water is circulated in the order of the slug hopper 122, the bypass line 210, the downstream cooling water circulation line 150B, the circulation pump 160, the cooler 170, and the slug hopper 122.

[Other Embodiments]
In the above-described embodiment, the control unit 90 included in the gasifier equipment 14, 14A controls each unit of the gasifier equipment 14, 14A, but other embodiments may be used. A mode in which a part of the operations of the gasifier facilities 14 and 14A is executed by an operator may be used.
For example, the operator may switch the open / closed state of the first on-off valve 180 and the second on-off valve 190. In this case, the operator performs the work of closing the first on-off valve 180 and the second on-off valve 190 when the gasifier facilities 14 and 14A are started. Further, the operator performs the work of opening the first on-off valve 180 and the second on-off valve 190 when the pressure detected by the pressure sensor 128 becomes equal to or higher than a predetermined pressure.

Further, in the above-described embodiment, the positions of the first position P1 where the first on-off valve 180 is arranged and the second position P2 where the second on-off valve 190 is arranged are set to the same positions as the position P0 on the water surface of the cooling water. Other aspects may be used.
For example, the position of the first position P1 where the first on-off valve 180 is arranged and the position of the second position P2 where the second on-off valve 190 is arranged may be below the position P0 of the water surface of the cooling water.

Further, in the above-described embodiment, the control unit 90 further indicates that the pressure detected by the pressure sensor 128 is lower than the predetermined pressure, or the predetermined pressure is lower than the pressure considering the tolerance for the position P0 of the cooling water surface. In addition, the low head system L and the high head system H may be separated by closing the first position P1 and the second on-off valve 190. Here, the predetermined pressure means a pressure that coincides with the head difference between the low head system L and the high head system H, as described in the first embodiment.
By doing so, for example, it is possible to suppress a problem that the pressure inside the gasifier 101 is lowered and the water level of the cooling water rises above the position P0 or the water surface position in consideration of the tolerance. can.

Further, in the above-described embodiment, coal is used as a fuel, but it can be applied to high-grade coal or low-grade coal, and it is used not only as coal but also as a renewable organic resource derived from living organisms. Biomass to be produced may be used. For example, thinned wood, waste wood, drifting wood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) made from these can be used. ..
Further, although the tower type gasifier has been described as the gasifier 101 in the above-described embodiment, even if the gasifier 101 is a crossover type gasifier, the vertical vertical direction of each device in the gasifier 101 can be seen. The same can be achieved by replacing the generated gas so as to match the gas flow direction.

10 Integrated coal gasification combined cycle equipment (gasification combined cycle equipment)
14,14A gasifier equipment (slag treatment system)
19 Generator 48 Foreign matter removal equipment 48A Cyclone (slag separator)
48Aa Intake port 48Ab Discharge port 48B Lock hopper 48C Storage tank 48D Partition valve 48E 1st discharge valve 48F 2nd discharge valve 49 Gas generation line 90 Control unit 101 Gasifier 102 Thin gas cooler 110 Pressure vessel 111 Gasifier wall 115 Anuras Part 116 Combustor part 117 Diffuser part 118 Reducer part 121 Gas outlet 122 Slug hopper 122A Bottom 126, 127 Burner 128 Pressure sensor (pressure detection part)
131 Evaporator
132 Superheater
134 Economizer
140 Slug discharge line 140A Upstream slug discharge line 140B Downstream slug discharge line 141 Intake port 150 Cooling water circulation line 150A Upstream cooling water circulation line 150B Downstream cooling water circulation line 160 Circulation pump 170 Cooler 180 First on-off valve 190 Second open / close Valve 210 Bypass line 220 Third on-off valve C Transport vehicle S Installation surface X Axis line

Claims (7)

A slag hopper provided vertically below the gasifier that gasifies the carbon-containing solid fuel, receives the slag generated from the carbon-containing solid fuel, and stores cooling water for cooling the slag.
A slag separator that separates the slag from a mixture of the slag and the cooling water,
A slag discharge line that guides the mixture from the slag hopper to the slag separator,
A cooling water circulation line that returns the cooling water separated by the slag separator to the slag hopper,
A circulation pump that forms a water flow from the slag hopper to the slag separator,
A cooler arranged on the downstream side of the circulation pump of the cooling water circulation line, and
A first on-off valve that is arranged on the slag discharge line and switches between a distribution state in which the mixture flows and a cutoff state in which the flow of the mixture is blocked.
A second on-off valve that is arranged in the cooling water circulation line and switches between a flow state in which the cooling water flows and a cutoff state in which the flow of the cooling water is cut off.
The slag hopper part of the cooling water stored in the downstream side of the second on-off valve, and a bypass line leading to the cooling water circulation line on the upstream side of the circulation pump,
Downstream of the slag discharge line that supplies the mixture to the slag separator from the first vertical position where the first on-off valve is located and the second vertical position where the second on-off valve is located. The third position in the vertical direction where the ends are placed is in a high position,
The first position and the second position are lower than the vertical position where the combustion part of the gasifier is arranged.
The circulation pump, wherein the cooling water circulation line, Luz lug exhaust system are disposed on the downstream side of a position where said cooling water to the cooling water circulation line is guided from the bypass line. Slag discharge system according to claim 1 vertical position of the outlet, it is higher than the upstream end of the slag discharge line for guiding the coolant to the bypass line from the slag hopper. A slag hopper provided vertically below the gasifier that gasifies the carbon-containing solid fuel, receives the slag generated from the carbon-containing solid fuel, and stores cooling water for cooling the slag.
A slag separator that separates the slag from a mixture of the slag and the cooling water,
A slag discharge line that guides the mixture from the slag hopper to the slag separator,
A cooling water circulation line that returns the cooling water separated by the slag separator to the slag hopper,
A circulation pump that forms a water flow from the slag hopper to the slag separator,
A cooler arranged on the downstream side of the circulation pump of the cooling water circulation line, and
A first on-off valve that is arranged on the slag discharge line and switches between a distribution state in which the mixture flows and a cutoff state in which the flow of the mixture is blocked.
A second on-off valve that is arranged in the cooling water circulation line and switches between a flow state in which the cooling water flows and a cutoff state in which the flow of the cooling water is cut off.
And a control unit for controlling the opening and closing state of the first on-off valve and the second on-off valve,
Downstream of the slag discharge line that supplies the mixture to the slag separator from the first vertical position where the first on-off valve is located and the second vertical position where the second on-off valve is located. The third position in the vertical direction where the ends are placed is in a high position,
The first position and the second position are lower than the vertical position where the combustion part of the gasifier is arranged.
Wherein the control unit is, the before starting the gasification furnace, the absence lug exhaust system first on-off valve and the second on-off valve be controlled to be closed. A pressure detector for detecting the pressure inside the gasifier is provided.
The slag discharge system according to claim 3 , wherein the control unit controls the first on-off valve and the second on-off valve to be in an open state when the pressure detected by the pressure detection unit exceeds a predetermined pressure. .. A gasifier that partially burns carbon-containing solid fuel to gasify it,
A gasification furnace facility comprising the slag discharge system according to any one of claims 1 to 4. A gasifier that partially burns carbon-containing solid fuel to gasify it,
The slag discharge system according to any one of claims 1 to 4.
A gasification combined power generation facility including a generator that generates power from the carbon-containing solid fuel gasified by the gasification furnace. A slag hopper provided below a gasifier that partially burns a carbon-containing solid fuel to gasify it, receives slag generated from the carbon-containing solid fuel, and stores cooling water for cooling the slag, and the slag. A slag separating device that separates the slag from the mixture of the cooling water and the cooling water, a slag discharge line that guides the mixture from the slag hopper to the slag separating device, and the cooling water separated by the slag separating device to the slug hopper. A cooling water circulation line to be returned, a circulation pump for forming a water flow from the slag hopper to the slag separator, a cooler for cooling the cooling water in the cooling water circulation line, and a mixture arranged in the slug discharge line. A first on-off valve that switches between a circulating state and a shutoff state that shuts off the flow of the mixture, and a shutoff that is arranged in the cooling water circulation line and shuts off the flow state in which the cooling water flows and the flow of the cooling water. It is an operation method of a slag discharge system including a second on-off valve for switching between states.
Downstream of the slag discharge line that supplies the mixture to the slag separator from the first vertical position where the first on-off valve is located and the second vertical position where the second on-off valve is located. The vertical third position where the ends are located is at a higher position, and the first position and the second position are lower than the vertical position where the combustion part of the gasifier is arranged.
A shutoff step of closing the first on-off valve and the second on-off valve before starting the gasification furnace.
With the first on-off valve and the second on-off valve closed by the shutoff step, the second on-off valve on the upstream side of the first on-off valve of the slag discharge line and the second on-off valve of the cooling water circulation line. The first water injection step of injecting the cooling water to the downstream side of the water
With the first on-off valve and the second on-off valve closed by the shutoff step, the second on-off valve on the downstream side of the first on-off valve of the slag discharge line and the cooling water circulation line. The second water injection step of injecting the cooling water to the upstream side of the water
After the water injection by the first water injection step and the second water injection step is performed, a pressure confirmation step of confirming whether the pressure in the gasification furnace is equal to or higher than a predetermined pressure, and a pressure confirmation step.
A method of operating a slag discharge system, comprising a connection step of opening the first on-off valve and the second on-off valve.

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