JP6162468B2 - Coal gasification system and coal gasification power generation system - Google Patents

Description

  The present invention relates to a coal gasification system that gasifies coal to obtain a gas mainly composed of carbon monoxide and hydrogen, and a coal gasification power generation system that generates power with a gas turbine using a generated gas obtained by gasifying the coal as fuel.

  Coal is produced by carbonizing ancient plants in the ground, and is classified according to the degree of carbonization (fixed carbon content) and volatile content.

  Currently, most of the coal used for coal-fired power generation is classified as bituminous coal. The water content of coal varies depending on the production area even with the same bituminous coal, but most of it is 10 wt% or less.

  A coal type with a lower carbonization degree than bituminous coal is called lignite. Brown coal has a higher water content than bituminous coal, and some coal types contain about 50%.

  In order to perform high-efficiency power generation in a power plant using coal as a fuel, it is necessary to finely pulverize the coal using a mill. However, coal containing a large amount of moisture cannot be pulverized by the mill unless it is dried.

  When coal that contains a lot of moisture such as lignite is dried and used as fuel for power plants, the power generation efficiency of the power plant is reduced due to the heat loss associated with the drying of coal, so lignite has less reserves than bituminous coal. Even in terms of price, there was little application as a fuel for coal power plants.

  Therefore, various devices for improving power generation efficiency have been proposed for a coal-fired power plant using coal containing a lot of moisture such as lignite as fuel.

  The technique described in Japanese Patent Application Laid-Open No. 2011-214814 (Patent Document 1) shows a method of drying coal containing a large amount of moisture with a fluidized bed dryer. The fluidized bed is fluidized with steam, and heat for drying the coal is supplied to the fluidized bed through a heat transfer tube.

  In the technique described in Patent Document 1, even when steam at about 200 ° C. is supplied as a fluid medium, heat supply through a heat transfer tube is necessary because the amount of heat necessary for vaporizing moisture in coal is large. This is because, if there is no heat supply through the heat transfer tube, the temperature of the water vapor supplied as the fluidized medium decreases, and the moisture condenses.

  In Patent Document 1, since the water in the coal can be converted into water vapor by the fluidized bed drying device, the heat used for drying is discharged from the fluidized bed drying device together with the water vapor used for fluidization and supplied to the steam turbine. It becomes possible to collect a part of the power as electric power. In addition, since the water vapor | steam discharged | emitted from a fluidized bed contains the microparticles | fine-particles of coal, dust removal is required before supplying to a steam turbine.

  The technique described in Japanese Patent Application Laid-Open No. 2010-106722 (Patent Document 2) shows a method of generating electricity with high efficiency by using coal containing a lot of moisture in coal gasification combined power generation.

  Coal gasification combined power generation gasifies coal, and uses the obtained product gas containing carbon monoxide and hydrogen as fuel for combined cycle power generation composed of a gas turbine and a steam turbine.

  Coal-fired power generation, which is currently widely used, is a coal boiler power generation that generates electricity by completely burning coal in a boiler, recovering the combustion heat as steam, and driving the steam turbine with this steam. Is able to improve the efficiency of coal boiler power generation by supplying the gas generated from coal in the gasification furnace to the gas turbine as fuel and increasing the combustion temperature of the gas generated at the gas turbine inlet. .

  In the technique described in Patent Document 2, the sensible heat of the exhaust gas at the gas turbine outlet is recovered as water vapor by an exhaust heat recovery boiler and then used for drying coal containing a large amount of moisture.

  The temperature of exhaust gas after exhaust heat recovery with an exhaust heat recovery boiler is about 100 ° C, which has not been effectively used in conventional thermal power plants. If coal can be dried with only this exhaust gas, power generation efficiency Can be improved.

  However, it is said that it is necessary to use the gas turbine exhaust gas before exhaust heat recovery because the amount of heat that the exhaust gas after exhaust heat recovery has is not enough to dry the coal. The effect is limited.

  The product gas obtained by gasifying coal is used not only for power generation but also as a raw material for synthesis such as methanol, synthetic light oil, and dimethyl ether.

  Each synthesis process has a different hydrogen / carbon monoxide ratio in the product gas, so a shift reaction that promotes a shift reaction to convert carbon monoxide and water vapor contained in the product gas into carbon dioxide and hydrogen. It is widely practiced to install a vessel and adjust the hydrogen / carbon monoxide ratio in the product gas.

  This shift reaction requires a catalyst, and the shift reactor is filled with a shift reaction catalyst. Although it depends on the performance of the shift reaction catalyst, in order to proceed with the shift reaction, 1.2 to 2 times as much steam as carbon monoxide in the product gas is required, and it is necessary to produce industrial steam by heating industrial water. is there.

  Even when the product gas obtained by gasifying coal is burned as fuel and used for power generation of a gas turbine, the generated gas is used as a gas turbine in order to reduce carbon dioxide emissions and prevent global warming. Before combustion in the above, carbon monoxide and water vapor are converted into carbon dioxide and hydrogen by a shift reaction, and after the converted carbon dioxide is removed, the produced gas containing hydrogen is supplied as a fuel to a gas turbine. It is necessary to burn.

  In order to increase the recovery rate of carbon dioxide contained in the product gas obtained by gasifying coal to 90% or more, depending on the type of coal, The same level of industrial water is required.

JP 2011-214814 A JP 2010-106722 A

  In order to adjust the hydrogen / carbon monoxide ratio of the product gas obtained by gasifying coal, a shift reaction is required to react carbon monoxide and water vapor in the product gas to convert them into carbon dioxide and hydrogen. In order to obtain water vapor required for the shift reaction, there is a problem that a large amount of industrial water is required.

  In the technique disclosed in Japanese Patent Application Laid-Open No. 2011-214814, heat used for drying coal is recovered by a steam turbine. However, with this technique, it is necessary to supply heat from the outside to evaporate the moisture released from the coal and bring it into a superheated state.

  The steam temperature at the outlet of the fluidized bed drying apparatus for drying coal is about 200 ° C. at the highest, and even if this steam is supplied to the steam turbine, the efficiency of conversion into electric power by the steam turbine is low, so the heat loss increases. There is a problem.

  Further, in the technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2010-106722, there is a certain effect of improving the power generation efficiency by using the gas turbine exhaust gas after exhaust heat recovery that has not been used for drying coal. Since the exhaust gas alone cannot provide the amount of heat necessary for drying the coal, it is necessary to add the gas turbine exhaust gas before heat recovery.

  However, with this technique, exhaust gas after drying the coal is released to the atmosphere, so the heat used for drying cannot be recovered, and the power generation efficiency improvement effect must be limited. Furthermore, since the moisture contained in the coal is also diffused into the atmosphere and cannot be effectively used, heat recovery from the exhaust gas after drying the coal and moisture recovery have been problems.

  An object of the present invention is to provide a coal gasification system and a coal gasification power generation system that can adjust the ratio of carbon monoxide and hydrogen in a product gas generated in a gasification furnace by a shift reaction of a shift reaction facility to improve plant efficiency. To provide a system.

The coal gasification system of the present invention supplies a product gas obtained by gasifying coal as a fuel, and then burns the product gas to dry the combustion exhaust gas generated to dry the moisture in the coal into the combustion exhaust gas. A dryer to be contained, a gasification furnace that supplies coal and an oxidant dried by the dryer and reacts the coal with an oxidant to generate gasified product gas; and downstream of the gasification furnace A dust removing device that is installed and removes fine particles in the product gas supplied from the gasification furnace, and is installed on the downstream side of the dryer to cool the combustion exhaust gas after drying the coal with the dryer. A condensation heat exchanger that converts the water contained in the combustion exhaust gas into a liquid, and a downstream side of the condensation heat exchanger, the combustion exhaust gas that has passed through the condensation heat exchanger, and the water condensed in the condensation heat exchanger To collect water from the flue gas Towers and, causes the water recovery column at the leading the collected water from the flue gas in the condensing heat exchanger heating by exchange flue gas and indirect heat, the gasification Atsushi Nobori water in the condensing heat exchanger A water supply system arranged to be supplied to the downstream side of the furnace or gasification furnace and upstream of the dedusting device and the downstream side of the dedusting device to remove particulates. And a shift reaction facility for conducting a shift reaction of carbon monoxide and water vapor in the generated gas to convert them into carbon dioxide and hydrogen.

The coal gasification power generation system of the present invention includes a dryer for drying coal, a gasification furnace for generating a gasified product by reacting coal dried with the dryer and an oxidant, and the gasification furnace. A shift reaction facility that shifts carbon monoxide and water vapor in the product gas generated in the gasification furnace into carbon dioxide and hydrogen, and is installed downstream of the shift reaction facility. In the coal gasification power generation system including a gas purification facility for removing sulfur compounds and the like from the product gas after the shift reaction, and a gas turbine device that generates power by burning the generated gas purified by the gas purification facility as fuel, The dryer supplies the combustion exhaust gas discharged from the gas turbine of the gas turbine device to dry the coal in the dryer so that the moisture in the coal is contained in the combustion exhaust gas, and the dried stone Is supplied to the gasification furnace that reacts with an oxidant to gasify, and a dedusting device that removes particulates contained in the combustion exhaust gas discharged from the dryer is installed downstream of the dryer And installed on the downstream side of the dedusting device, cooling the combustion exhaust gas after drying the coal with the dryer, and installing a condensation heat exchanger that converts the moisture contained in the combustion exhaust gas into a liquid, Installed on the downstream side of the condensation heat exchanger, and installed a water recovery tower for recovering water from the combustion exhaust gas by guiding the combustion exhaust gas passed through the condensation heat exchanger and water condensed in the condensation heat exchanger, The water recovered from the combustion exhaust gas in the water recovery tower is guided to the condensation heat exchanger to indirectly heat exchange with the combustion exhaust gas to raise the temperature, and the water heated by the condensation heat exchanger is downstream of the gasification furnace. A water supply system is installed to supply equipment located in The water recovered from combustion exhaust gas by said water recovery column branched from the water supply system, increasing humidifier which humidifies the air supplied to the pressurized gas turbine combustor in a gas turbine compressor of the gas turbine device A separate water supply system is disposed so as to supply to the carbon dioxide, and is installed on the downstream side of the dedusting device. It is characterized by the installation of a shift reaction facility that shifts carbon dioxide and hydrogen by a shift reaction of water and water vapor.

Moreover, the coal gasification power generation system of the present invention includes a dryer for drying coal, a gasification furnace for generating a gasified product by reacting coal dried with the dryer with an oxidant, and the gas A shift reaction facility installed on the downstream side of the gasification furnace to shift the carbon monoxide and water vapor in the product gas generated in the gasification furnace into carbon dioxide and hydrogen, and on the downstream side of the shift reaction facility In a coal gasification power generation system provided with a gas purification facility that is installed and removes sulfur compounds and the like from the product gas after the shift reaction, and a gas turbine device that generates electricity by burning the generated gas purified by the gas purification facility as fuel ,
The dryer supplies the combustion exhaust gas discharged from the gas turbine of the gas turbine device to dry the coal in the dryer so that the moisture in the coal is contained in the combustion exhaust gas, and the dried coal reacts with the oxidizing agent. The dust removing device is configured to be supplied to the gasification furnace to be gasified, and installed on the downstream side of the dryer to remove fine particles contained in the combustion exhaust gas discharged from the dryer, and the dust removing device A first condensing heat exchanger for cooling the flue gas after drying the coal with the dryer and converting the moisture contained in the flue gas into a liquid, 1 is installed on the downstream side of the condensing heat exchanger of the first and recovers water from the flue gas by guiding the flue gas that has passed through the first condensing heat exchanger and the water condensed in the first condensing heat exchanger. established a water recovery column, said first water recovery column The water recovered from the combustion exhaust gas is guided to the first condensing heat exchanger and indirectly heat exchanged with the combustion exhaust gas to raise the temperature, and the water heated by the first condensing heat exchanger is supplied to the gasification furnace. A first water supply system is arranged so as to supply a cooling tower that is installed downstream and generated in a gasification furnace to cool the generated gas, and the exhaust gas discharged from the gas turbine of the gas turbine device is supplied to the dryer. A second condensing heat exchanger is installed to cool the flue gas exhausted from the diverging and lead the flue gas contained in the flue gas into liquid. is located downstream of the exchanger, the second set up water recovery column from the second flue gas which has passed through the condensing heat exchanger to collect water, recovered from the combustion exhaust gas in the second water recovery tower water To the second condensing heat exchanger to exchange heat with combustion exhaust gas And a humidifier that humidifies air supplied to the gas turbine combustor by pressurizing the water heated by the second condensing heat exchanger with the gas turbine compressor of the gas turbine device. A second water supply system is disposed so as to supply carbon dioxide that is installed downstream of the dedusting device and from which fine particles have been removed by the dedusting device and water vapor to guide carbon monoxide in the generated gas. It is characterized by the installation of a shift reaction facility that shifts carbon dioxide and hydrogen by a shift reaction of water and water vapor.

  ADVANTAGE OF THE INVENTION According to this invention, the coal gasification system and coal gasification system which can adjust the ratio of carbon monoxide and hydrogen in the product gas produced | generated by the gasification furnace by the shift reaction of shift reaction equipment, and improve the efficiency of a plant A coal gasification power generation system equipped with can be realized.

Schematic configuration diagram showing a coal gasification system which is a gasification system for gasifying coal containing a large amount of moisture and which has a configuration for supplying moisture recovered from coal to a gasification furnace according to the first embodiment of the present invention. . A gasification system for gasifying coal containing a large amount of moisture, wherein the coal gasification system according to the second embodiment of the present invention is configured to supply moisture recovered from coal to a cooling tower downstream of the gasification furnace. FIG. The schematic block diagram which shows the coal gasification electric power generation system which is 3rd Example of this invention which produces electric power with a gas turbine by using the produced gas which gasified coal containing much moisture as a fuel. A coal gasification power generation system that generates power with a gas turbine using a product gas obtained by gasifying coal containing a lot of moisture as a fuel, and has a configuration for supplying moisture recovered from the coal to a cooling tower downstream of the gasification furnace. The schematic block diagram which shows the coal gasification power generation system which is 4th Example. A coal gasification power generation system that generates electricity with a gas turbine using gas generated from gas that contains a lot of moisture as a fuel. The schematic block diagram which shows the coal gasification power generation system which is a 5th Example of this invention which has the structure of 2 systems | systems of the system | strain which guide | induces, and the system | strain which leads to another condensation heat exchange. This is a coal gasification power generation system that generates power with a gas turbine using a product gas obtained by gasifying coal containing a lot of moisture as a fuel, and is a sixth embodiment of the present invention having a configuration in which two or more coal dryers are installed. The schematic block diagram which shows a coal gasification power generation system.

  A coal gasification system and a coal gasification power generation system which are embodiments of the present invention will be described below with reference to the drawings.

  The coal gasification system which is 1st Example of this invention is demonstrated using FIG.

  In the coal gasification system of the present embodiment shown in FIG. 1, the coal 1 containing moisture serving as fuel is brought into contact with the combustion exhaust gas 14 discharged from a gas turbine (not shown) or the like by a dryer 40 of a type. dry.

  The coal 1 dried by the dryer 40 is supplied to a gasification furnace 50 installed on the downstream side of the dryer 40, and the coal 1 and an oxidizing agent 2 such as oxygen supplied to the gasification furnace 50 from the outside, By reacting, the gasification furnace 50 generates a product gas 20 mainly composed of carbon monoxide and hydrogen.

  Here, the combustion exhaust gas 14 supplied to the dryer 40 is supplied to the gasifier 50 as the exhaust gas 14a discharged from the outlet of the dryer 40 after the coal 1 is dried. However, the moisture 14 d recovered by the dryer 40 is also supplied from the dryer 40 to the gasifier 50.

  Further, the coal 1 is dried by the dryer 40, and the exhaust gas 14a discharged from the outlet of the dryer 40 contains moisture contained in the coal 1 as water vapor 14c.

  Therefore, the exhaust gas 14a containing the water vapor 14c is led to a condensation heat exchanger 70 installed on the downstream side of the dryer 40 and cooled to condense a part of the water vapor 14c in the exhaust gas 14a, thereby performing condensation heat exchange. It is guided to a water recovery tower 65 installed downstream of the vessel 70 for recovery.

  Further, the remaining water vapor 14c in the exhaust gas 14a that has not been condensed in the condensation heat exchanger 70 is guided to the water recovery tower 65 together with the exhaust gas 14a, and liquid water 10 supplied from the outside is sprayed into the water recovery tower 65. Thus, most of the remaining water vapor 14c in the exhaust gas 14a is condensed and recovered as liquid water 14b by the water recovery tower 65.

  The water 14b recovered from the exhaust gas 14a in the water recovery tower 65 is supplied to the condensation heat exchanger 70 from the water recovery tower 65 and is heated by indirect heat exchange with the exhaust gas 14a. The condensation heat exchanger 70 is supplied to the gasification furnace 50 through the water supply system 15 via 70, but is heated by the sensible heat of the product gas 20 generated in the gasification furnace 50 to become steam.

  The generated gas 20 containing water vapor is supplied to a dust removing device 53 installed on the downstream side of the gasification furnace 50, and the unreacted coal particles contained in the generated gas 20 in the dust removing device 53. The product gas 20 is purified by removing the gas and the like, and is supplied to the shift reactor 55 installed on the downstream side of the dust removing device 53.

In the shift reactor 55, the carbon monoxide and the water vapor 12 in the product gas 20 are subjected to a shift reaction (H ₂ O + CO → CO ₂ + H ₂ ) to be converted into carbon dioxide and hydrogen.

  Here, when the steam / carbon monoxide ratio in the product gas 20 is smaller than the value necessary for obtaining the target carbon monoxide conversion, the steam 12 is added to the inlet side of the shift reactor 55. The product gas 20 is supplied so that the water vapor / carbon monoxide ratio in the product gas 20 reaches a target value.

  In the coal gasification system that generates power using coal with a lot of moisture, the heat loss for drying the coal was large, but according to the coal gasification system of this example, the heat used for drying the coal was It can be recovered as sensible heat of the product gas at the exit of the cooling tower.

  In addition, when adjusting the hydrogen / carbon monoxide ratio in the product gas in a coal gasification system, the product gas undergoes a shift reaction, which depends on the performance of the shift reaction catalyst, but is the same as the mass of carbon in the coal. A large amount of industrial water was required, but according to the coal gasification system of this example, the water held by the coal can be given to the product gas, so industrial water is not required and running costs are greatly increased. Can be reduced.

  As described above, according to the present embodiment, the coal gasification that can adjust the ratio of carbon monoxide and hydrogen in the product gas generated in the gasification furnace by the shift reaction of the shift reaction equipment and improve the efficiency of the plant. A system can be realized.

  Next, the coal gasification system which is 2nd Example of this invention is demonstrated using FIG.

  Since the basic configuration of the coal gasification system of the present embodiment shown in FIG. 2 is the same as that of the first embodiment shown in FIG. 1, the description of the configuration common to both is omitted. Only different configurations will be described below.

  In the coal gasification system of the first embodiment shown in FIG. 1, liquid water recovered from the combustion exhaust gas is supplied to the gasification furnace 50. In the coal gasification system of the present embodiment shown in FIG. A cooling tower 52 is installed on the downstream side of the gasification furnace 50 and on the upstream side of the dust removing device 53, and the generated gas 20 generated in the gasification furnace 50 is supplied to the cooling tower 52. The product gas 20 is cooled by the cooling tower 52.

  In the coal gasification system of the present embodiment, the water 14b recovered from the exhaust gas 14a in the water recovery tower 65 is supplied from the water recovery tower 65 to the condensation heat exchanger 70 and indirectly heat exchange with the exhaust gas 14a. And is supplied to the cooling tower 52 on the downstream side of the gasification furnace 50 through the water supply system 17 via the condensation heat exchanger 70 and supplied from the gasification furnace 50 in the cooling tower 52. The generated gas 20 is cooled.

  Then, the generated gas 20 cooled by the cooling tower 52 is supplied to a dust removing device 53, and the dust contained in the generated gas 20 supplied from the gasification furnace 50 via the cooling tower 52 by the dust removing device 53. The reaction coal particles and the like are removed and purified, and the purified product gas 20 is supplied to the shift reactor 55 installed on the downstream side of the dedusting device 53.

  The water vapor 12 is also supplied to the shift reactor 55 from the outside.

  The liquid water 14b supplied from the water recovery tower 65 to the cooling tower 52 via the condensation heat exchanger 70 through the water supply system 17 is supplied from the water recovery tower 65 which is the coal gasification system of the first embodiment. Similarly to the case of the liquid water 14 b supplied to the gasification furnace 50 via the condensation heat exchanger 70 through the supply system 15, it becomes steam in the cooling tower 52 by the sensible heat of the generated gas 20.

  In the coal gasification system that generates power using coal with a lot of moisture, the heat loss for drying the coal was large, but according to the coal gasification system of this example, the heat used for drying the coal was It can be recovered as sensible heat of the product gas at the exit of the cooling tower.

  In addition, when adjusting the hydrogen / carbon monoxide ratio in the product gas in a coal gasification system, the product gas undergoes a shift reaction, which depends on the performance of the shift reaction catalyst, but is the same as the mass of carbon in the coal. A large amount of industrial water was required, but according to the coal gasification system of this example, the water held by the coal can be given to the product gas, so industrial water is not required and running costs are greatly increased. Can be reduced.

  As described above, according to the present embodiment, the coal gasification that can adjust the ratio of carbon monoxide and hydrogen in the product gas generated in the gasification furnace by the shift reaction of the shift reaction equipment and improve the efficiency of the plant. A system can be realized.

  Next, a coal gasification power generation system according to a third embodiment of the present invention will be described with reference to FIG.

  In the coal gasification power generation system of the present embodiment shown in FIG. 3, a dryer of a type in which coal 1 containing moisture as fuel is brought into direct contact with combustion exhaust gas 14 discharged from a gas turbine 62 constituting a gas turbine device. 40 to dry.

The coal 1 dried in direct contact with the combustion exhaust gas 14 discharged from the gas turbine 62 by the dryer 40 is finely pulverized by a pulverizer (not shown) and then conveyed by nitrogen N ₂ which is a coal carrier gas 3. And supplied to the gasifier 50.

  In the gasification furnace 50, the supplied coal 1 is gasified by reacting with an oxidant 2 such as oxygen supplied from the outside to the gasification furnace 50, and a product gas 20 mainly composed of carbon monoxide and hydrogen. Is generated.

  Here, the gasification furnace 50 is operated at a high temperature, and the ash contained in the coal 1 is discharged from the gasification furnace 50 as molten slag 5 to the outside.

The combustion exhaust gas 14 used for drying the coal 1 by the dryer 40 is discharged as an exhaust gas 14a from the outlet of the dryer 40 to the downstream side of the dryer 40, but is recovered from the exhaust gas 14 by the dryer 40. The moisture 14 d is supplied to the gasifier 50 together with the nitrogen N ₂ of the coal carrier gas 3.

  In the coal gasification power generation system of the present embodiment, a water recovery tower 65 for recovering water from the combustion exhaust gas 14 a is installed on the downstream side of the dryer 40, and is included in the combustion exhaust gas 14 a discharged from the outlet of the dryer 40. The water vapor 14c is cooled by a condensation heat exchanger 70 installed on the downstream side of the dryer 40 and guided to the water recovery tower 65, and liquid water 10 supplied from the outside is sprayed on the water recovery tower 65. Most of the remaining water vapor 14c in the exhaust gas 14a is condensed and recovered by this water recovery tower 65 as liquid water 14b.

  The amount of water 10 supplied to the water recovery tower 65 that supplies water 10 from the outside to the water recovery tower 65 is measured by measuring the water level of the water recovery tower 65 with a level meter 91 and measuring the level meter 91 with the water level. Based on the above, the opening and closing of the flow rate adjustment valve 81 for supplying the water 10 to the water recovery tower 65 is operated and adjusted. The gas generated in the water recovery tower 65 is discharged from the chimney 66 to the atmosphere.

  In the coal gasification power generation system of the present embodiment, the water 14b contained in the combustion exhaust gas 20a is recovered by the water recovery tower 65, and the water 14b is heated from the water recovery tower 65 through the water supply system 15 to the heat of the gasifier 50. Although being supplied to the recovery unit 51, the water 14 b supplied from the water recovery tower 65 through the water supply system 15 is located downstream of the reaction unit of the gasifier 50 and is integrated with the gasifier 50. The heat recovery unit 51 provided is sprayed in a plurality of stages, and the generated gas 20 generated in the gasification furnace 50 in the heat recovery unit 51 and the water 14b sprayed in several stages are supplied. Are in direct contact with each other.

  The coal gasification system provided in the coal gasification power generation system of this embodiment employs a coal gasification system having the same basic configuration as that of the first embodiment shown in FIG.

  The amount of water 14b supplied from the water recovery tower 65 to the heat recovery unit 51 of the gasifier 50 through the water supply system 15 is changed in the shift reactor 55 installed on the downstream side of the gasifier 50 and the dust removing device 53. Supply of water 14b to be supplied to the heat recovery unit 51 of the gasification furnace 50 so that the water vapor / carbon monoxide ratio in the product gas 20 is in a range necessary for obtaining a target carbon monoxide conversion rate. Adjust the amount.

That is, the plant information / operation target 87 such as the coal supply amount and oxygen supply amount to the gasification furnace 50, the performance of the shift reaction catalyst charged in the shift reactor 55, the target carbon monoxide conversion rate, and the like is stored in the control device 86. Then, the controller 86 calculates the flow rate and water vapor / carbon monoxide ratio at the outlet gas of the gasifier 50 and the water vapor concentration / carbon monoxide ratio required at the inlet of the shift reactor 55, and calculates these calculated values. The required amount of water 14b is obtained by using the water supply system 15 based on the operation signal output from the control device 86 so that the amount of water 14b can be supplied to the heat recovery unit 51 of the gasifier 50. The supply amount of the water 14b supplied from the water recovery tower 65 to the heat recovery part 51 of the gasifier 50 through the water supply system 15 is adjusted by controlling the opening and closing of the installed flow rate adjusting valve 80.

In addition, the temperature of the product gas 20 falls by making the product gas 20 produced | generated with the gasification furnace 50 and the water 14b contact directly. In order to prevent moisture condensation in the dust removing device 53 installed on the downstream side of the gasification furnace 50, the temperature on the inlet side of the dust removal device 53 needs to be maintained at a specified value or higher. A thermometer 90 is installed on the inlet side of the dust removing device 53 installed on the downstream side, and the temperature of the product gas 20 on the inlet side of the dust removing device 53 detected by the thermometer 90 is input to the control device 86. By controlling the opening and closing of the flow rate adjusting valve 80 by the control device 86, water recovery is performed so that the temperature of the product gas 20 on the inlet side of the dust removing device 53 detected by the thermometer 90 does not fall below a specified temperature. recovered tower 65 adjusts the supply amount of supplying water 14b from the aqueous stripping column 65 to the heat recovery section 51 of the gasifier 50 through the water supply system 15.

  As described above, water 14b is sprayed into the heat recovery unit 51 that is located downstream of the reaction unit of the gasification furnace 50 and is provided integrally with the gasification furnace 50, and sprayed into the product gas 20 in a plurality of stages. By supplying, the produced gas 20 produced | generated within the gasification furnace 50 is prevented from becoming low temperature locally.

  Further, by not generating a local low temperature site in the product gas 20, the sprayed water 14b is quickly vaporized, and unreacted coal (char) in the product gas 20 is agglomerated due to the interposition of liquid water. To prevent.

  The water 14b supplied from the water recovery tower 65 through the water supply system 15 to the heat recovery section 51 on the downstream side of the gasification furnace 50 in a plurality of stages becomes steam due to the sensible heat of the product gas 20.

  The generated gas 16 containing water vapor is supplied from the heat recovery unit 51 on the downstream side of the gasification furnace 50 to the knockout drum 57 installed on the downstream side of the heat recovery unit 51, and the moisture remaining in the liquid state is supplied. After the removal, the dust is supplied to a dust removing device 53 installed on the downstream side of the knockout drum 57.

  The dust removing device 53 collects and removes unreacted coal particles called char 6 contained in the product gas 16. Since the char 6 collected from the dust removing device 53 is transferred to the gasification furnace 50 by the nitrogen 4, the present embodiment is configured by returning the unreacted coal particles to the gasification furnace 50 in this way. In this coal gasification power generation system, it is possible to improve the utilization efficiency of coal.

  Here, a part of the liquid water 14b recovered by the water recovery tower 65 passes downstream from the water recovery tower 65 via the condensation heat exchanger 70 through the water supply system 15 and downstream of the gasifier 50 side. The remaining liquid water 14b recovered by the water recovery tower 65 is condensed from the water recovery tower 65 in order to humidify the air compressed by the gas turbine compressor 61. A part of the water 14b is supplied to a humidification tower 64 installed on the downstream side of the gas turbine compressor 61 through a water branch system 15b branched from the middle of the water supply system 15 for supplying the water 14b to the heat exchanger 70. doing.

  Then, the air compressed by the gas turbine compressor 61 that has been humidified by supplying water 14b to the humidification tower 64 is subjected to indirect heat exchange with the combustion exhaust gas 14 discharged from the gas turbine 62, so that the humidification is performed. Combustion exhaust gas 14 in which air that has been led to a heat exchanger 74 located downstream of the tower 64 and upstream of the gas turbine combustor 60 and has been humidified by the heat exchanger 74 is discharged from the gas turbine 62. After being heated by the gas turbine combustor 60, the gas turbine combustor 60 is supplied to the gas turbine combustor 60 and burned in the gas turbine combustor 60 together with the hydrogen of the fuel that is the product gas 13 after the shift reaction in the shift reactor 55. Generated and drives the gas turbine 62.

  The gas turbine 62 drives a gas turbine compressor 61 and a gas turbine generator 63, and the gas turbine generator 63 generates electric power.

  The product gas 16 after being dedusted by the dust removing device 53 is supplied to a water washing tower 54 installed on the downstream side of the dust removing device 53 downstream of the knockout drum 57, and water supplied to the water washing tower 54 from the outside. 8 is used to clean and remove halogen and the like in the product gas 16, and the purified product gas 16 is heated through a heat exchanger 71 installed on the downstream side of the water washing tower 54, and then It is supplied to the shift reactor 55 installed on the downstream side.

  The product gas 16 generated in the gasification furnace 50 is dedusted by the dust removing device 53 and then passed through the water washing tower 54 to lower the temperature of the product gas 16, but the product gas 16 washed by the water washing tower 54 is removed. The heat exchanger 71 is made to flow down as a heat source, and the heat loss of the product gas 16 is reduced by indirect heat exchange with the product gas 16 before flowing into the water washing tower 54 and the heat exchanger 71 to raise the temperature. doing.

  The product gas 16 washed in the water washing tower 54 is heated by a heat exchanger 71 and then supplied to a shift reactor 55 installed on the downstream side of the water washing tower 54. Carbon monoxide and water vapor in the inside are shifted and converted into carbon dioxide and hydrogen.

  When the water vapor / carbon monoxide ratio in the product gas 16 at the inlet of the shift reactor 55 is smaller than the value necessary to obtain the target carbon monoxide conversion, the inlet of the shift reactor 55 On the side, the supply amount of the water vapor 12 supplied from the outside into the product gas 16 is increased.

  The product gas 13 after the shift reaction by the shift reactor 55 is supplied to an absorption tower 56 that constitutes a gas purification facility that removes sulfur compounds and the like from the product gas 13, and the absorption gas installed on the downstream side of the shift reactor 55. In the tower 56, the product gas 13 is brought into contact with the absorption liquid 11 containing, for example, methyldiethanolamine as a main component, sulfur compounds such as hydrogen sulfide and carbon dioxide contained in the product gas 13 are removed, and the fuel is removed. A product gas 13 containing hydrogen is generated.

  The temperature of the product gas 13 at the outlet of the shift reactor 55 is 200 to 300 ° C., whereas the operating temperature of the absorption tower 56 is about 40 ° C., and the product gas 13 is passed through the absorption tower 56 The temperature of the product gas 13 will decrease.

  Therefore, the product gas 13 at the outlet of the shift reactor 55 is mixed with the product gas 13 at the outlet of the absorption tower 56 by a heat exchanger 73 located downstream of the shift reactor 55 and upstream of the absorption tower 56. The temperature is reduced by indirect heat exchange, and the heat of the product gas 13 at the outlet of the shift reactor 55 is supplied to the product gas 13 at the outlet of the absorption tower 56, thereby preventing heat loss of the product gas 13. .

  In addition, since the temperature of the product gas 13 at the outlet of the shift reactor 55 is higher than the operating temperature of the absorption tower 56 even after passing through the heat exchanger 73, it is cooled by the heat exchanger 73 and then passed to the absorption tower 56. It is configured to pass gas.

  The product gas 13 containing hydrogen obtained by removing the sulfur compound contained in the product gas 13 by the absorption liquid 11 in the absorption tower 56 is downstream of the shift reactor 55 from the absorption tower 56 and upstream of the absorption tower 56. The temperature is raised by the heat exchanger 72 located on the side, supplied to the gas turbine combustor 60 constituting the gas turbine device as fuel, and combusted in the gas turbine combustor 60 to generate the high-temperature combustion exhaust gas 14, and this combustion The gas turbine 62 is driven by the exhaust gas 14.

  The gas turbine 62 drives a gas turbine compressor 61 and a gas turbine generator 63, and the gas turbine generator 63 generates electric power.

  In the gas turbine combustor 60, the air 26 combusting the produced gas 13 containing hydrogen supplied to the gas turbine combustor 60 is taken in from the atmosphere and pressurized by the gas turbine compressor 61.

  On the inlet side of the gas turbine compressor 61, liquid spray water 9 is sprayed into the air 26, and heat generated when the air 26 is compressed by the gas turbine compressor 61 is used to vaporize the spray water 9. Thus, the temperature of the air 26 is prevented from rising and heat loss due to compression is prevented.

  The product gas 16 after being dedusted by the dust removing device 53 removes halogen or the like by the water washing tower 54 and supplies it to the shift reactor 55. Since the temperature of the product gas 16 is lowered by passing the product gas 16 after dedusting through the water washing tower 54, the product gas 16 after the dust is removed from the product gas 16 at the outlet gas of the water washing tower 54 by the dust removing device 53. And heat loss is reduced by indirect heat exchange with the heat exchanger 71.

  If the water vapor / carbon monoxide ratio in the product gas 16 at the inlet of the shift reactor 55 is smaller than the value required to obtain the target carbon monoxide conversion, an external Steam 12 is supplied.

  The product gas 13 after the shift reaction by the shift reactor 55 is supplied to the absorption tower 56 and is brought into contact with, for example, an absorption liquid 11 mainly composed of methyldiethanolamine to remove sulfur compounds such as hydrogen sulfide and carbon dioxide. .

  While the temperature of the product gas 13 at the outlet of the shift reactor 55 is 200 to 300 ° C., the operating temperature of the absorption tower 56 is about 40 ° C., and the temperature of the product gas 13 is passed through the absorption tower 56. Therefore, the product gas 13 at the outlet of the shift reactor 55 is indirectly heat-exchanged with the product gas at the outlet of the absorption tower 56 by the heat exchanger 73 to absorb the heat of the product gas at the outlet of the shift reactor 55. By giving the product gas at the outlet of the column 56, heat loss is prevented.

  Since the product gas temperature at the outlet of the shift reactor 55 is higher than the operating temperature of the absorption tower 56 even after passing through the heat exchanger 73, the gas is passed through the absorption tower 56 after being cooled by the heat exchanger 73. To do.

  The product gas 13 from which the sulfur compound has been removed by the absorption tower 56 is supplied to the gas turbine combustor 60 as fuel. The air 26 for burning the generated gas 13 is pressurized by a gas turbine compressor 61.

  Liquid spray water 9 is sprayed at the inlet of the gas turbine compressor 61, and heat generated when the air 26 is compressed by the gas turbine compressor 61 is used to vaporize the spray water 9. Temperature rise and heat loss due to compression is prevented.

  In the coal gasification power generation system of the present embodiment, in the dryer 40 that dries the coal 1 using the combustion exhaust gas 14 of the gas turbine, the moisture contained in the combustion exhaust gas 14a discharged from the outlet of the dryer 40 is recovered. First, the exhaust gas 14a is guided to the dust removing device 41 installed on the downstream side of the dryer 40 to remove the coal fine particles scattered in the exhaust gas 14a, and then the condensation heat installed on the downstream side of the dust removing device 41. The exhaust gas 14a is guided to the exchanger 70 and cooled to condense a part of the water vapor in the exhaust gas 14a, and the exhaust gas 14a is guided to the water recovery tower 65 installed on the downstream side of the condensation heat exchanger 70. The liquid water 10 sprayed on the water recovery tower 65 from the outside in the recovery tower 65 is brought into contact with the exhaust gas 14a, so that most of the remaining water vapor in the exhaust gas 14a is also condensed to form liquid water. It is configured to be recovered as 4b.

  Further, the amount of water 10 supplied to the water recovery tower 65 for supplying water 10 from the outside to the water recovery tower 65 was measured by measuring the water level of the water recovery tower 65 with a level meter 91. Control is performed by opening and closing the flow rate adjustment valve 81 that supplies the water 10 to the water recovery tower 65 so that the measured value falls within the specified range.

  In the coal gasification power generation system that generates power using coal with a lot of moisture, the heat loss for drying the coal was large, but according to this example, the heat used for drying the coal is discharged from the gasification furnace or the cooling tower. It can be recovered as sensible heat of the product gas.

  In the coal gasification power generation system of the present embodiment, water vapor in the product gas reacts with carbon monoxide in the downstream shift reactor and is converted into hydrogen and carbon dioxide. Even when the gas is refined with lowering, the heat loss due to the condensation of water vapor is small, and most of the heat used for drying the coal can be supplied to the power generation by the gas turbine.

  The temperature of the combustion gas at the gas turbine inlet can be set to 1300 ° C. to 1500 ° C., and the heat cycle can be driven at a higher temperature than the power generation by the steam turbine using steam of about 200 ° C. Yes, it is possible to significantly reduce heat loss.

  Further, in the case of adjusting the hydrogen / carbon monoxide ratio in the product gas in the coal gasification system of this embodiment, or in the carbon dioxide recovery type coal gasification power generation system, in order to cause the product gas to shift reaction, a shift reaction catalyst Although a large amount of industrial water of the same level as the mass of carbon in the coal was necessary, according to the present embodiment, the moisture held by the coal can be given to the product gas. Industrial water is not required, and running costs can be greatly reduced.

  As described above, according to the present embodiment, the coal gasification that can adjust the ratio of carbon monoxide and hydrogen in the product gas generated in the gasification furnace by the shift reaction of the shift reaction equipment and improve the efficiency of the plant. A power generation system can be realized.

  Next, a coal gasification power generation system according to a fourth embodiment of the present invention will be described with reference to FIG.

  The coal gasification power generation system of this embodiment shown in FIG. 4 has the same basic configuration as the coal gasification power generation system of the third embodiment shown in FIG. Only different configurations will be described below.

In the coal gasification power generation system of the third embodiment shown in FIG. 3, the water 14d recovered from the exhaust gas 14a at the outlet of the dryer 40 is sprayed in a plurality of stages on the heat recovery section 51 downstream of the reaction section of the gasification furnace 50. In the coal gasification power generation system of the present embodiment shown in FIG. 4, the cooling tower is located at a position downstream of the gasification furnace 50 and upstream of the dedusting device 53. The water 14b recovered from the water recovery tower 65 is sprayed and supplied to the cooling tower 52 through the water supply system 15 via the condensation heat exchanger 70. .

  The coal gasification system provided in the coal gasification power generation system of this embodiment employs a coal gasification system having the same basic configuration as that of the second embodiment shown in FIG.

  In the coal gasification power generation system of the present embodiment, the supply amount of the water 14b supplied to the cooling tower 52 is the same as that of the coal gasification power generation system of the third embodiment shown in FIG. In the shift reactor 55 installed on the downstream side of the dust device 53, the cooling tower so that the water vapor / carbon monoxide ratio in the product gas 20 is within a range necessary for obtaining a target carbon monoxide conversion rate. The supply amount of the water 14b supplied to 52 is adjusted.

That is, the plant information / operation target 87 such as the coal supply amount and oxygen supply amount to the gasification furnace 50, the performance of the shift reaction catalyst charged in the shift reactor 55, the target carbon monoxide conversion rate, and the like is stored in the control device 86. Then, the controller 86 calculates the flow rate and water vapor / carbon monoxide ratio at the outlet gas of the gasifier 50 and the water vapor concentration / carbon monoxide ratio required at the inlet of the shift reactor 55, and calculates these calculated values. The required amount of water 14b is obtained by use, and the amount of water 14b is installed downstream of the gasifier 50 in this embodiment, instead of the heat recovery unit 51 of the gasifier 50 of the third embodiment. The cooling tower 52 is controlled from the water recovery tower 65 through the water supply system 15 by controlling the opening and closing of the flow rate adjusting valve 80 installed in the water supply system 15 based on the operation signal output from the control device 86 so that the cooling tower 52 can be supplied. Supply to 52 It is configured to adjust the supply amount of that water 14b.

  In the coal gasification power generation system that generates power using coal with a lot of moisture, the heat loss for drying the coal was large, but according to this example, the heat used for drying the coal is discharged from the gasification furnace or the cooling tower. It can be recovered as sensible heat of the product gas.

  In the coal gasification power generation system of the present embodiment, water vapor in the product gas reacts with carbon monoxide in the downstream shift reactor and is converted into hydrogen and carbon dioxide. Even when the gas is refined with lowering, the heat loss due to the condensation of water vapor is small, and most of the heat used for drying the coal can be supplied to the power generation by the gas turbine.

  The temperature of the combustion gas at the gas turbine inlet can be set to 1300 ° C. to 1500 ° C., and the heat cycle can be driven at a higher temperature than the power generation by the steam turbine using steam of about 200 ° C. Yes, it is possible to significantly reduce heat loss.

  Further, in the case of adjusting the hydrogen / carbon monoxide ratio in the product gas in the coal gasification system of this embodiment, or in the carbon dioxide recovery type coal gasification power generation system, in order to cause the product gas to shift reaction, a shift reaction catalyst Although a large amount of industrial water of the same level as the mass of carbon in the coal was necessary, according to the present embodiment, the moisture held by the coal can be given to the product gas. Industrial water is not required, and running costs can be greatly reduced.

  As described above, according to the present embodiment, the coal gasification that can adjust the ratio of carbon monoxide and hydrogen in the product gas generated in the gasification furnace by the shift reaction of the shift reaction equipment and improve the efficiency of the plant. A power generation system can be realized.

  Next, a coal gasification power generation system according to a fifth embodiment of the present invention will be described with reference to FIG.

  The basic configuration of the coal gasification power generation system of this embodiment shown in FIG. 5 is the same as that of the coal gasification power generation system of the fourth embodiment shown in FIG. Only different configurations will be described below.

  As in the coal gasification system of the fourth embodiment, the coal gasification system provided in the coal gasification power generation system of the present embodiment has the same basic configuration as that of the second embodiment shown in FIG. The system is adopted.

  In the coal gasification power generation system of the present embodiment, two water recovery systems that condense and recover moisture contained in the combustion exhaust gas 14 discharged from the gas turbine 62 are disposed.

  Of the two water recovery systems that condense and recover the moisture contained in the combustion exhaust gas 14 of the gas turbine, one water supply system 15a uses the coal dryer to remove the combustion exhaust gas 14 discharged from the gas turbine 62. After being used for drying the coal 1 at 40, the flue gas 14a is supplied to the water recovery tower 65 via the condensation heat exchanger 70a, and the water 14b recovered from the flue gas 14a in the water recovery tower 65 is This is one water supply system 15a configured to supply from the water recovery tower 65 to the cooling tower 52 installed downstream of the gasification furnace 50 through the water supply system 15a.

  Further, as shown in the coal gasification power generation system of the third embodiment shown in FIG. 3, as a supply destination of the water 14 b recovered by the water recovery tower 65, the downstream side of the reaction section of the gasification furnace 50 is used. It is also possible to supply to the gasifier heat recovery unit 51.

In the coal gasification power generation system of the present embodiment, the other water supply system 16b of the two water recovery systems arranged to condense and recover the moisture contained in the combustion exhaust gas 14 of the gas turbine is shown in FIG. As shown in the coal gasification power generation system of the present embodiment, the flue gas 14 discharged from the gas turbine 62 is branched from the upstream side of the coal dryer 40 and passed through the condensation heat exchanger 70b to collect the water. It is supplied to a water recovery tower 67 provided separately from the tower 65. The water recovery tower 67 recovers the water 16b from the combustion exhaust gas 14, and the water 16b recovered from the water recovery tower 67 is passed through the water supply system 15b. is the other water supply system 16b which is configured to supply air pressurized in a gas turbine compressor 61 to the humidifier tower 64 to humidified.

Then, the air dehumidified increased by spraying water 16a in humidifier tower 64 is supplied to the gas turbine combustor 60, is used for combustion of the fuel to produce combustion gas at the gas turbine combustor 60, the Combustion gas is supplied to the gas turbine 62 to drive the gas turbine 62.

  As described above, when two water recovery systems for recovering moisture contained in the combustion exhaust gas 14 of the gas turbine are provided, that is, the water supply system 15a and the water supply system 16b, the combustion exhaust gas at the outlet of the dryer 40 is disposed. 14a is not supplied to the gas turbine 62, and therefore an abnormality occurs in the dedusting equipment 41 installed on the outlet side of the dryer 40, and fine particles are mixed into the combustion exhaust gas 14a at the outlet of the dryer 40. However, since the fine particles are not supplied to the gas turbine 62, the risk of damaging the blades of the gas turbine 62 rotating at high speed can be reduced.

  In addition, particulates are mixed in the combustion exhaust gas 14a discharged from the outlet of the dryer 40 due to an abnormality in the dust removing device 41 and flow into the water recovery tower 65, and the liquid water 14b recovered by the water recovery tower 65 is collected. Even if the fine particles are supplied to the cooling tower 52 installed on the downstream side of the gasification furnace 50, the product gas 16 supplied from the gasification furnace 50 is removed from the downstream side of the cooling tower 52. Since the dust removing device 53 for dust is installed, fine particles can be removed by the dust removing device 53, so that the fine particles do not reach the gas turbine 62.

  In the coal gasification power generation system of the present embodiment, the combustion exhaust gas 14a (which is likely to contain fine particles) obtained by drying the coal 1 with the dryer 40 and the gas turbine 62 branched on the upstream side of the dryer 40 are used. Since the exhaust gas 14 is divided into the exhausted combustion exhaust gas 14 and supplied to the water recovery towers 65 and 67 to recover the water 14b and 16b from the combustion exhaust gas 14a and 14, respectively, the water recovery tower 67 Even when humidified air is supplied to the gas turbine combustor 60 via the humidification tower 64, it is possible to prevent fine particles from entering the humidification tower 64 and being supplied to the gas turbine 62 as humidified air. The risk of damaging the blades of the gas turbine 62 rotating at high speed can be reduced.

  As described above, according to the present embodiment, the coal gasification that can adjust the ratio of carbon monoxide and hydrogen in the product gas generated in the gasification furnace by the shift reaction of the shift reaction equipment and improve the efficiency of the plant. A power generation system can be realized.

  Next, a coal gasification power generation system according to a sixth embodiment of the present invention will be described with reference to FIG.

  The coal gasification power generation system of this embodiment shown in FIG. 6 has the same basic configuration as the coal gasification power generation system of the fifth embodiment shown in FIG. Only different configurations will be described below.

  As in the coal gasification system of the fifth embodiment, the coal gasification system provided in the coal gasification power generation system of the present embodiment has the same basic configuration as that of the second embodiment shown in FIG. The system is adopted.

  In the coal gasification power generation system of the present embodiment, as a drying method of coal, a method of continuously drying coal, for example, a method of contacting coal with combustion exhaust gas while transferring the coal from the inlet to the outlet of the dryer by a belt conveyor or the like. When a thing is employ | adopted, the dryer which dries the coal 1 can construct | assemble a system with one dryer.

  As a method for drying coal, in a batch method, for example, a method of filling a dryer with a certain amount of coal and fluidizing and drying the coal with combustion exhaust gas, a dryer for drying coal 1 as shown in FIG. It is desirable to install two or more units in parallel like the dryer 40a and the dryer 40b.

  This is because when the supply of water 14b supplied from the combustion exhaust gas 14a of the gas turbine 62 to the cooling tower 52 installed on the downstream side of the gasification furnace 50 is interrupted, the water 14b recovered from the combustion exhaust gas 14a This is because it is necessary to supply the water vapor 12 supplied to the shift reactor 55 from the outside on the inlet side of the shift reactor 55.

  When two dryers 40a and 40b are installed to dry the coal 1, while the combustion exhaust gas 14 is passed from the gas turbine 62 to one dryer 40a, the other dryer 40b. Then, the supply of the combustion exhaust gas 14 from the gas turbine 62 is stopped, and the coal 1 in the other dryer 40 b is discharged to a coal supply system that supplies the coal to the gasification furnace 50.

  When the coal discharge is completed, the undried coal 1 is filled in the other dryer 40b. Then, when the drying of the coal 1 is completed in one dryer 40a, the supply of the combustion exhaust gas 14 supplied from the gas turbine 62 to the one dryer 40a is stopped, and the other dryer is supplied from the gas turbine 62. It switches to the supply of the combustion exhaust gas 14 to 40b.

  And after switching the supply destination of the combustion exhaust gas 14 discharged | emitted from this gas turbine 62 from one dryer 40a to the other dryer 40b, the dried coal 1 in one dryer 40a is made into gas It is discharged into a coal supply system that supplies coal to the chemical reactor 50.

  In the coal gasification power generation system of this embodiment, coal containing a large amount of water classified as lignite and peat is gasified to produce a product gas mainly composed of carbon monoxide and hydrogen, and chemicals such as methanol are produced from the product gas. The present invention can be applied to a coal gasification system that synthesizes products, a coal gasification power generation system that generates power with a gas turbine using generated gas as fuel, and the like.

  As described above, according to the present embodiment, the coal gasification that can adjust the ratio of carbon monoxide and hydrogen in the product gas generated in the gasification furnace by the shift reaction of the shift reaction equipment and improve the efficiency of the plant. A power generation system can be realized.

  1: Coal (carbon-based fuel), 2: Oxygen (oxidant), 3: Coal carrier gas, 4: Char carrier gas, 5: Slag, 6: Char, 7: Air, 8: Washing tower washing water, 9: Spray water, 10: supply water, 11: absorption liquid, 12: water vapor, 13, 16, 20: generated gas, 14, 14a, 14c: combustion exhaust gas, 14b, 16a: water, 14d: moisture, 15, 17, 15a 16b: water supply system, 15b: water branch system, 40: dryer, 41: dedusting device, 50: gasification furnace, 51: gasification furnace heat recovery section, 52: cooling tower, 53: dedusting device, 54: flush tower, 55: shift reactor, 56: absorption tower, 57: knockout drum, 58: regeneration tower, 59: carbon dioxide / hydrogen sulfide separator, 60: gas turbine combustor, 61: gas turbine compressor, 62: Gas turbine, 63: Gas turbine generator, 6 : Humidification tower, 65, 67: Water recovery tower, 66: Chimney, 70: Condensation heat exchanger, 71-74: Heat exchanger, 75: Distribution pipe for recovered water, 76: Header for water spray, 77: Water Piping for spraying, 78: Water cooling pipe, 80 to 85: Flow rate adjusting valve, 86: Control device, 87: Plant information / control target, 90: Thermometer, 91: Water recovery tower level meter, 92: Flow meter, 93: Water tank level meter, 94: pressure gauge, 95-96: thermometer.

Claims (8)

A dryer that feeds the generated gas obtained by gasifying coal as fuel, and dries the generated exhaust gas generated by burning the generated gas to contain moisture in the coal in a gaseous state in the exhaust gas;
A gasification furnace that supplies coal and an oxidizer dried by the dryer and reacts the coal with an oxidant to produce a gasified product gas;
A dust removing device installed on the downstream side of the gasification furnace to remove fine particles in the generated gas supplied from the gasification furnace;
A condensation heat exchanger that is installed on the downstream side of the dryer, cools the combustion exhaust gas after drying the coal with the dryer, and converts the moisture contained in the combustion exhaust gas into a liquid;
A water recovery tower installed on the downstream side of the condensation heat exchanger, for introducing the combustion exhaust gas that has passed through the condensation heat exchanger and the water condensed in the condensation heat exchanger to recover water from the combustion exhaust gas;
The water recovered from the combustion exhaust gas in the water recovery tower is led to the condensation heat exchanger to indirectly heat exchange with the combustion exhaust gas to raise the temperature, and the water heated by the condensation heat exchanger is converted into the gasifier or gas. downstream of the furnace, and a water supply system arranged to supply to the upstream side of the dedusting apparatus,
Shift that is installed on the downstream side of the dedusting device, converts the generated gas from which fine particles have been removed by the dedusting device and water vapor, and shifts carbon monoxide and water vapor in the generated gas to carbon dioxide and hydrogen. Coal gasification system characterized by having reaction equipment. The coal gasification system according to claim 1,
A cooling tower for cooling the generated gas supplied from the gasification furnace is installed on the downstream side of the gasification furnace and on the upstream side of the dedusting device,
The coal gasification system, wherein the water supply system is disposed so as to supply the water heated by the condensation heat exchanger to a cooling tower installed downstream of the gasification furnace. A dryer for drying the coal, a gasification furnace for generating a gasified product by reacting the coal dried with the dryer with an oxidant, and the gasification installed downstream of the gasification furnace Shift reaction equipment that shifts carbon monoxide and water vapor in the product gas generated in the furnace to carbon dioxide and hydrogen, and is installed on the downstream side of the shift reaction equipment. In a coal gasification power generation system equipped with a gas purification facility that removes gas etc., and a gas turbine device that generates electricity by burning the generated gas purified by the gas purification facility as a fuel,
The dryer supplies the combustion exhaust gas discharged from the gas turbine of the gas turbine device to dry the coal in the dryer so that the moisture in the coal is contained in the combustion exhaust gas, and the dried coal reacts with the oxidizing agent. Configured to supply to the gasification furnace to be gasified,
A dust removing device is installed on the downstream side of the dryer to remove fine particles contained in the combustion exhaust gas discharged from the dryer.
Installed on the downstream side of the dedusting device, installed a condensation heat exchanger that cools the flue gas after drying the coal with the dryer and makes the moisture contained in the flue gas into a liquid,
Installed on the downstream side of the condensation heat exchanger, installed a water recovery tower for collecting the combustion exhaust gas that has passed through the condensation heat exchanger and the water condensed in the condensation heat exchanger to recover water from the combustion exhaust gas,
The water recovered from the combustion exhaust gas in the water recovery tower is guided to the condensation heat exchanger to indirectly heat exchange with the combustion exhaust gas to raise the temperature, and the water heated by the condensation heat exchanger is sent downstream of the gasification furnace. Install a water supply system arranged to supply equipment located on the side,
A humidifier for branching water recovered from combustion exhaust gas from the water recovery tower from the water supply system and humidifying air supplied to the gas turbine combustor by being pressurized by a gas turbine compressor of the gas turbine device Arrange another water supply system to supply,
Shift that is installed on the downstream side of the dedusting device, converts the generated gas from which fine particles have been removed by the dedusting device and water vapor, and shifts carbon monoxide and water vapor in the generated gas to carbon dioxide and hydrogen. Coal gasification power generation system characterized by installing reaction equipment. In the coal gasification power generation system according to claim 3,
Supplied to the cooling tower to cool the product gas produced by the heat recovery unit or the gasification furnace in the gasification furnace is equipment installed the heating water in the condensing heat exchanger downstream of the gasification furnace The coal gasification power generation system, wherein the water supply system is arranged as described above. A dryer for drying the coal, a gasification furnace for generating a gasified product by reacting the coal dried with the dryer with an oxidant, and the gasification installed downstream of the gasification furnace Shift reaction equipment that shifts carbon monoxide and water vapor in the product gas generated in the furnace to carbon dioxide and hydrogen, and is installed on the downstream side of the shift reaction equipment. In a coal gasification power generation system equipped with a gas purification facility that removes gas etc., and a gas turbine device that generates electricity by burning the generated gas purified by the gas purification facility as a fuel,
The dryer supplies the combustion exhaust gas discharged from the gas turbine of the gas turbine device to dry the coal in the dryer so that the moisture in the coal is contained in the combustion exhaust gas, and the dried coal reacts with the oxidizing agent. Configured to supply to the gasification furnace to be gasified,
A dust removing device is installed on the downstream side of the dryer to remove fine particles contained in the combustion exhaust gas discharged from the dryer.
A first condensing heat exchanger is installed on the downstream side of the dedusting device, and cools the combustion exhaust gas after drying the coal with the dryer to convert the moisture contained in the combustion exhaust gas into a liquid. ,
Installed on the downstream side of the first condensing heat exchanger, the flue gas passing through the first condensing heat exchanger and the water condensed in the first condensing heat exchanger are guided to recover water from the flue gas Install a first water recovery tower ,
The water recovered from the combustion exhaust gas in the first water recovery tower is led to the first condensing heat exchanger to indirectly heat exchange with the combustion exhaust gas to raise the temperature, and the temperature is raised in the first condensing heat exchanger. A first water supply system is arranged to supply the generated water to a cooling tower that is installed downstream of the gasification furnace and cools the generated gas generated in the gasification furnace,
A combustion exhaust gas discharged from the gas turbine of the gas turbine device is branched and guided upstream of the dryer, and the branched combustion exhaust gas is cooled to convert the moisture contained in the combustion exhaust gas into a liquid second. Installed a condensation heat exchanger
A second water recovery tower installed on the downstream side of the second condensing heat exchanger and recovering water from the flue gas passing through the second condensing heat exchanger;
The water recovered from the combustion exhaust gas in the second water recovery tower is led to the second condensing heat exchanger to indirectly heat exchange with the combustion exhaust gas, and the temperature is raised by the second condensing heat exchanger. A second water supply system that supplies the humidified air that is pressurized by the gas turbine compressor of the gas turbine apparatus and humidifies the air supplied to the gas turbine combustor,
Shift that is installed on the downstream side of the dedusting device, converts the generated gas from which fine particles have been removed by the dedusting device and water vapor, and shifts carbon monoxide and water vapor in the generated gas to carbon dioxide and hydrogen. Coal gasification power generation system characterized by installing reaction equipment. In the coal gasification power generation system according to claim 5,
A plurality of the dryers are arranged in parallel, the combustion exhaust gas discharged from the gas turbine of the gas turbine device is supplied to the plurality of dryers to dry the coal in the dryer, and moisture in the coal is removed. It is configured to be included in the combustion exhaust gas and to be supplied to the gasification furnace that gasifies by reacting dry coal with an oxidizing agent,
The coal gasification power generation system, wherein the dust removing device for removing fine particles contained in the combustion exhaust gas discharged from the dryer is installed on the downstream side of the plurality of dryers arranged in parallel. In the coal gasification power generation system according to any one of claims 3 to 6,
Calculate the flow rate and composition of the product gas generated in the gasification furnace from the supply amount of coal supplied to the gasification furnace and the supply amount of oxidant, and based on the calculated flow rate and gas composition of the generated gas, the target Calculate the water vapor / carbon monoxide ratio on the inlet side of the shift reactor necessary to obtain the carbon monoxide conversion ratio and supply water necessary to obtain the calculated value of the water vapor / carbon monoxide ratio. Install a control device to calculate the quantity,
The supply amount of water supplied from the water recovery tower to the heat recovery section of the gasification furnace or the cooling tower on the downstream side of the gasification furnace is adjusted based on the supply amount of water calculated by the control device. Coal gasification power generation system characterized by that. In the coal gasification power generation system according to claim 7,
The control device is configured to recover the heat of the gasifier so that the temperature of the product gas becomes a specified value or less based on a thermometer of the product gas installed on the inlet side of the dust removing device installed downstream of the gasifier. Or a coal gasification power generation system, wherein a supply amount of water supplied to a cooling tower on a downstream side of the gasification furnace is calculated.

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