JP2013167418A - Cooling device for thermally-treated material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of flow failure in a cooling device for a thermally-treated material.SOLUTION: A cooling device for a thermally-treated material includes: a hollow cooling container 201, in one end of which a drying coal throwing port 202 is provided and in other end of which a cooled coal ejection port 203 is provided; a fluidized gas supply part 204 that generates a flow layer Sc as well as the drying coal by supplying the fluidized gas to the cooling container 201; a heat transfer pipe 206 that cools the drying coal in the flow layer Sc by circulating cooled water to the inside thereof; and a control device 223 that sets a temperature of the cooled water so that the temperature becomes higher than a dew-point temperature in the cooling container 201.

Description

  The present invention relates to a heat treatment product cooling apparatus that cools, for example, a dried heat treatment product by heat treatment.

  For example, a combined coal gasification power generation facility is a power generation facility that aims to further increase the efficiency and environmental performance compared to conventional coal-fired power generation by gasifying coal and combining it with combined cycle power generation. This coal gasification combined cycle power generation facility has a great merit that it can use coal with abundant resources, and it is known that the merit can be further increased by expanding the applicable coal types.

  Conventional coal gasification combined power generation facilities generally have a coal supply device, a drying device, a coal gasification furnace, a gas purification device, a gas turbine facility, a steam turbine facility, an exhaust heat recovery boiler, a gas purification device, and the like. ing. Therefore, the coal is dried and then pulverized, supplied to the coal gasifier as pulverized coal, and air is taken in. The coal gas is combusted and gasified in this coal gasifier, and the product gas (combustible) Gas) is produced. Then, the product gas is purified and then supplied to the gas turbine equipment to burn and generate high-temperature and high-pressure combustion gas to drive the turbine. The exhaust gas after driving the turbine recovers thermal energy by the exhaust heat recovery boiler, generates steam and supplies it to the steam turbine equipment, and drives the turbine. As a result, power generation is performed. On the other hand, the exhaust gas from which the thermal energy has been recovered is released into the atmosphere through a chimney after harmful substances are removed by the gas purification device.

  By the way, the coal used in such a coal gasification combined power generation facility is not only a high-grade coal (high-grade coal) having a high calorific value such as bituminous coal and anthracite, but also a comparison such as sub-bituminous coal and lignite. There is a low-grade coal (low-grade coal) with a low calorific value. This low-grade coal has a large amount of moisture to be brought in, and the power generation efficiency decreases due to this moisture. For this reason, in the case of low-grade coal, it is necessary to dry the coal with the above-described drying apparatus to remove moisture and then pulverize and supply the coal gasifier. And since a drying apparatus heats and dries coal and is discharged in a high temperature state, it is necessary to cool this high temperature coal with a cooling device.

  There exists what was described in the following patent document 1 as what cools the heat-dried coal by such heat processing. In the cooling method for heat-treated coal described in Patent Document 1, first, the heat-treated coal is cooled to an appropriate temperature by combustion exhaust gas having a low oxygen content sprayed with water, and then cooled to the final temperature by air. I have to.

JP-A-62-115090

  As described above, low-grade coal has a high water content, so the dried coal after drying may still have moisture. When such dry coal is cooled, condensation occurs inside the cooling device. The surface of the dry charcoal becomes wet and tends to adhere to the surrounding dry charcoal, and a lump (agglomer) is generated. Then, the cooling device may cause a flow failure or a conveyance failure due to the generated lump.

  This invention solves the subject mentioned above, and aims at providing the cooling device of the heat processing material which prevents generation | occurrence | production of the flow defect.

  In order to achieve the above object, a cooling apparatus for a heat-treated product according to the present invention includes a cooling container having a hollow shape in which a heat-treated product input part is provided on one end side and a coolant discharge part is provided on the other end side, and the cooling A fluidized gas supply unit that forms a fluidized bed together with the heat-treated product by supplying a fluidized gas to the container; a cooling unit that cools the heat-treated product of the fluidized bed by circulating a cooling medium inside the heat transfer tube; And a cooling temperature setting device for setting the temperature of the cooling medium to be higher than the dew point temperature in the cooling container.

  Therefore, the fluidized gas supply unit supplies the fluidized gas into the cooling container, so that the heat treatment moves through the fluidized bed, and the cooling unit circulates the cooling medium inside the heat transfer tube, thereby configuring the fluidized bed. The heat-treated product to be cooled is cooled. At this time, the cooling temperature setting device sets the temperature of the cooling medium to be higher than the dew point temperature in the cooling container, so that the water vapor generated from the heat-treated product does not condense, and the generation of a lump due to the adhesion of the dried materials. As a result, it is possible to prevent poor flow of the heat-treated product and the dried product in the fluidized bed.

  In the heat treatment product cooling device of the present invention, the cooling temperature setting device is characterized in that the temperature of the cooling medium is changed in accordance with the moisture content of the heat treatment product so as to be higher than the dew point temperature in the cooling container.

  Therefore, by changing the temperature of the cooling medium according to the moisture content of the heat treatment product, the temperature of the cooling medium is higher than the dew point temperature in the cooling container and can be adjusted to an optimum temperature according to the state of the heat treatment product. .

  In the heat treatment product cooling device of the present invention, a water content detection device for detecting the water content of the heat treatment material input from the heat treatment material input section, and a heat exchanger capable of adjusting the temperature of the cooling medium are provided, and the cooling temperature The setting device is characterized in that the temperature of the cooling medium is adjusted by the heat exchanger based on the moisture content of the heat-treated product detected by the moisture content detection device.

  Therefore, by detecting the moisture content of the heat-treated product and adjusting the temperature of the cooling medium with a heat exchanger based on the detected moisture content of the heat-treated product, the temperature of the cooling medium can be adjusted according to the state of the heat-treated product at an early stage. It can be adjusted to the optimum temperature.

  In the cooling apparatus for a heat-treated product of the present invention, a cooling pipe that flows a cooling medium is provided along the outer surface of the cooling container, and the cooling temperature setting device is configured such that the temperature of the cooling medium that flows through the cooling pipe is in the cooling container. The dew point temperature is changed to be higher.

  Therefore, by changing the temperature of the cooling medium in the cooling pipe provided along the outer surface of the cooling vessel to be higher than the dew point temperature in the cooling vessel, condensation of water vapor generated from the heat-treated product is suppressed regardless of the outside temperature. And generation | occurrence | production of the lump by the adhesion of dry matter can be prevented.

  The heat treatment product cooling device of the present invention is characterized in that an inert gas supply device is provided for supplying an inert gas to the heat treatment material conveyance passage connected to the heat treatment material input portion.

  Therefore, it is possible to reduce the partial pressure of water vapor by supplying an inert gas to the heat treatment material conveyance passage, to suppress condensation of water vapor generated from the heat treatment material, and to generate a lump due to adhesion between dry materials. Can be prevented.

  According to the cooling device for a heat-treated product of the present invention, a cooling unit for cooling the heat-treated product of the fluidized bed is provided by circulating the cooling medium inside the heat transfer tube, and the temperature of the cooling medium is higher than the dew point temperature in the cooling vessel. Since the cooling temperature setting device is set so as to be high, the water vapor generated from the heat-treated product does not condense, preventing the formation of lumps due to adhesion between the dried products, and as a result, the heat-treated product in the fluidized bed In addition, poor flow of the dried product can be prevented.

FIG. 1 is a schematic side view showing a fluidized bed drying apparatus according to an embodiment of the present invention. FIG. 2 is a schematic rear view showing the fluidized bed drying apparatus of the present embodiment. FIG. 3 is a schematic diagram showing the cooler of the present embodiment. FIG. 4 is a graph showing the cooling water temperature with respect to the dry coal moisture content in the cooler of this example. FIG. 5 is a schematic configuration diagram of the coal gasification combined power generation facility of the present embodiment.

  Exemplary embodiments of a heat treatment product cooling device according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  FIG. 1 is a schematic side view showing a fluidized bed drying apparatus according to one embodiment of the present invention, FIG. 2 is a schematic rear view showing a fluidized bed drying apparatus according to this embodiment, and FIG. 3 is a cooler of this embodiment. FIG. 4 is a graph showing the cooling water temperature with respect to the dry coal moisture content in the cooler of the present embodiment, and FIG. 5 is a schematic configuration diagram of the coal gasification combined power generation facility of the present embodiment.

  The coal gasification combined power generation facility (IGCC: Integrated Coal Gasification Combined Cycle) of the present embodiment adopts an air combustion method in which coal gas is generated in a gasification furnace using air as an oxidizer and is purified by a gas purification device. Coal gas is supplied as fuel gas to gas turbine equipment to generate electricity. That is, the combined coal gasification combined power generation facility of this embodiment is a power generation facility of an air combustion system (air blowing). In this case, low-grade coal is used as the wet fuel supplied to the gasifier.

  In this embodiment, as shown in FIG. 5, the coal gasification combined power generation facility 10 includes a coal supply device 11, a fluidized bed drying device 12, a pulverized coal machine (mill) 13, a coal gasification furnace 14, and a char recovery device 15. , A gas refining device 16, a gas turbine facility 17, a steam turbine facility 18, a generator 19, and a heat recovery steam generator (HRSG) 20.

  The coal feeder 11 includes a raw coal bunker 21, a coal feeder 22, and a crusher 23. The raw coal bunker 21 can store low-grade coal, and can drop a predetermined amount of low-grade coal into the coal feeder 22. The coal feeder 22 can transport the low-grade coal dropped from the raw coal bunker 21 by a conveyor or the like and drop it on the crusher 23. The crusher 23 can crush the dropped low-grade coal into a predetermined size.

  The fluidized bed drying device 12 supplies drying steam (superheated steam) to the low-grade coal introduced by the coal feeder 11 so as to heat and dry the low-grade coal while flowing. Moisture contained in the graded coal can be removed. The fluidized bed drying device 12 is provided with a cooler (cooling device for heat-treated product) 31 for cooling the dried low-grade coal taken out from the lower portion, and the dried and cooled dried coal is supplied to the dried coal bunker 32. Stored. Further, the fluidized bed drying apparatus 12 is provided with a dry coal cyclone 33 and a dry coal electrostatic precipitator 34 for separating dry coal particles from steam taken out from above, and the dry coal particles separated from the steam are dried coal bunker. 32 is stored. The steam from which the dry coal has been separated by the dry coal electrostatic precipitator 34 is compressed by the steam compressor 35 and then supplied to the fluidized bed drying device 12 as drying steam.

  The pulverized coal machine 13 is a coal pulverizer, and pulverizes the low-grade coal (dried coal) dried by the fluidized bed dryer 12 into fine particles to produce pulverized coal. That is, in the pulverized coal machine 13, the dry coal stored in the dry coal bunker 32 is dropped by the coal feeder 36, and the dry coal is converted into low-grade coal having a predetermined particle size or less, that is, pulverized coal. The pulverized coal after being pulverized by the pulverized coal machine 13 is separated from the conveying gas by the pulverized coal bag filters 37a and 37b and stored in the pulverized coal supply hoppers 38a and 38b.

  The coal gasification furnace 14 can supply pulverized coal processed by the pulverized coal machine 13 and can be recycled by returning the char (unburned coal) recovered by the char recovery device 15. .

  That is, the coal gasification furnace 14 is connected to the compressed air supply line 41 from the gas turbine equipment 17 (compressor 61), and can supply compressed air compressed by the gas turbine equipment 17. The air separation device 42 separates and generates nitrogen and oxygen from air in the atmosphere. A first nitrogen supply line 43 is connected to the coal gasifier 14, and a pulverized coal supply hopper is connected to the first nitrogen supply line 43. Charging lines 44a and 44b from 38a and 38b are connected. The second nitrogen supply line 45 is also connected to the coal gasification furnace 14, and the char return line 46 from the char recovery device 15 is connected to the second nitrogen supply line 45. Further, the oxygen supply line 47 is connected to the compressed air supply line 41. In this case, nitrogen is used as a carrier gas for coal and char, and oxygen is used as an oxidant.

  The coal gasification furnace 14 is, for example, a spouted bed type gasification furnace, which combusts and gasifies coal, char, air (oxygen) supplied therein or water vapor as a gasifying agent, and produces carbon dioxide. A combustible gas (product gas, coal gas) containing carbon as a main component is generated, and a gasification reaction takes place using this combustible gas as a gasifying agent. The coal gasification furnace 14 is provided with a foreign matter removing device 48 that removes foreign matter mixed with pulverized coal. In this case, the coal gasification furnace 14 is not limited to the spouted bed gasification furnace, and may be a fluidized bed gasification furnace or a fixed bed gasification furnace. The coal gasification furnace 14 is provided with a gas generation line 49 for combustible gas toward the char recovery device 15, and can discharge combustible gas containing char. In this case, by providing a gas cooler in the gas generation line 49, the combustible gas may be cooled to a predetermined temperature and then supplied to the char recovery device 15.

  The char recovery device 15 includes a dust collector 51 and a supply hopper 52. In this case, the dust collector 51 is constituted by one or a plurality of bag filters or cyclones, and can separate char contained in the combustible gas generated in the coal gasification furnace 14. The combustible gas from which the char has been separated is sent to the gas purification device 16 through the gas discharge line 53. The supply hopper 52 stores the char separated from the combustible gas by the dust collector 51. A bin may be disposed between the dust collector 51 and the supply hopper 52, and a plurality of supply hoppers 52 may be connected to the bin. A char return line 46 from the supply hopper 52 is connected to the second nitrogen supply line 45.

The gas purification device 16 performs gas purification by removing impurities such as sulfur compounds and nitrogen compounds from the combustible gas from which the char has been separated by the char recovery device 15. The gas purifier 16 purifies the combustible gas to produce fuel gas and supplies it to the gas turbine equipment 17. In the gas purifier 16, since the combustible gas from which the char is separated still contains sulfur (H ₂ S), the sulfur is finally removed by removing it with the amine absorbent. Is recovered as gypsum and used effectively.

  The gas turbine equipment 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. The combustor 62 has a compressed air supply line 65 connected to the compressor 61, a fuel gas supply line 66 connected to the gas purifier 16, and a combustion gas supply line 67 connected to the turbine 63. Further, the gas turbine equipment 17 is provided with a compressed air supply line 41 extending from the compressor 61 to the coal gasification furnace 14, and a booster 68 is provided in the middle. Therefore, in the combustor 62, the compressed air supplied from the compressor 61 and the fuel gas supplied from the gas purifier 16 are mixed and burned, and the rotating shaft 64 is rotated by the generated combustion gas in the turbine 63. By doing so, the generator 19 can be driven.

  The steam turbine facility 18 includes a turbine 69 that is coupled to the rotating shaft 64 in the gas turbine facility 17, and the generator 19 is coupled to the base end portion of the rotating shaft 64. The exhaust heat recovery boiler 20 is provided in the exhaust gas line 70 from the gas turbine equipment 17 (the turbine 63), and generates steam by exchanging heat between the air and the high temperature exhaust gas. Therefore, the exhaust heat recovery boiler 20 is provided with the steam supply line 71 between the steam turbine equipment 18 and the turbine 69 of the steam turbine equipment 18, the steam recovery line 72 is provided, and the steam recovery line 72 is provided with the condenser 73. Yes. Therefore, in the steam turbine facility 18, the turbine 69 is driven by the steam supplied from the exhaust heat recovery boiler 20, and the generator 19 can be driven by rotating the rotating shaft 64.

  The exhaust gas from which heat has been recovered by the exhaust heat recovery boiler 20 is freed of harmful substances by the gas purification device 74, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

  Here, the action | operation of the coal gasification combined cycle power generation equipment 10 of a present Example is demonstrated.

  In the coal gasification combined power generation facility 10 of the present embodiment, raw coal (low-grade coal) is stored in the raw coal bunker 21 by the coal feeder 11, and the low-grade coal of the raw coal bunker 21 is supplied to the coal. The machine 22 drops the crusher 23 where it is crushed to a predetermined size. The crushed low-grade coal is heated and dried by the fluidized bed drying device 12, cooled by the cooler 31, and stored in the dry coal bunker 32. Further, the steam taken out from the upper part of the fluidized bed drying device 12 is separated into dry coal particles by the dry coal cyclone 33 and the dry coal electrostatic precipitator 34 and compressed by the steam compressor 35 before being supplied to the fluidized bed drying device 12. Returned as drying steam. On the other hand, the dry coal particles separated from the steam are stored in the dry coal bunker 32.

  The dry coal stored in the dry coal bunker 32 is fed into the pulverized coal machine 13 by the coal feeder 36, where it is pulverized into fine particles to produce pulverized coal, and through the pulverized coal bag filters 37a and 37b. And stored in the pulverized coal supply hoppers 38a and 38b. The pulverized coal stored in the pulverized coal supply hoppers 38 a and 38 b is supplied to the coal gasification furnace 14 through the first nitrogen supply line 43 by nitrogen supplied from the air separation device 42. Further, the char recovered by the char recovery device 15 described later is supplied to the coal gasifier 14 through the second nitrogen supply line 45 by nitrogen supplied from the air separation device 42. Further, the compressed air extracted from the gas turbine equipment 17 to be described later is boosted by the booster 68 and then supplied to the coal gasification furnace 14 through the compressed air supply line 41 together with oxygen supplied from the air separation device 42.

  In the coal gasification furnace 14, the supplied pulverized coal and char are combusted by compressed air (oxygen), and the pulverized coal and char are gasified to generate combustible gas (coal gas) mainly composed of carbon dioxide. Can be generated. The combustible gas is discharged from the coal gasifier 14 through the gas generation line 49 and sent to the char recovery device 15.

  In the char recovery device 15, the combustible gas is first supplied to the dust collector 51, whereby the char contained in the gas is separated from the combustible gas. The combustible gas from which the char has been separated is sent to the gas purification device 16 through the gas discharge line 53. On the other hand, the fine char separated from the combustible gas is deposited on the supply hopper 52, returned to the coal gasifier 14 through the char return line 46, and recycled.

  The combustible gas from which the char has been separated by the char recovery device 15 is subjected to gas purification by removing impurities such as sulfur compounds and nitrogen compounds in the gas purification device 16 to produce fuel gas. In the gas turbine facility 17, when the compressor 61 generates compressed air and supplies the compressed air to the combustor 62, the combustor 62 is supplied from the compressed air supplied from the compressor 61 and the gas purification device 16. Combustion gas is generated by mixing with fuel gas and combusting, and the turbine 63 is driven by this combustion gas, so that the generator 19 can be driven via the rotating shaft 64 to generate power.

  The exhaust gas discharged from the turbine 63 in the gas turbine equipment 17 generates steam by exchanging heat with air in the exhaust heat recovery boiler 20, and supplies the generated steam to the steam turbine equipment 18. . In the steam turbine facility 18, the generator 69 can be driven through the rotating shaft 64 to generate electric power by driving the turbine 69 with the steam supplied from the exhaust heat recovery boiler 20.

  Thereafter, in the gas purification device 74, harmful substances in the exhaust gas discharged from the exhaust heat recovery boiler 20 are removed, and the purified exhaust gas is discharged from the chimney 75 to the atmosphere.

  Hereinafter, first, the fluidized bed drying device 12 in the coal gasification combined power generation facility 10 described above will be described in detail.

  The fluidized bed drying apparatus 12 is a plug flow type drying apparatus, and as shown in FIGS. 1 and 2, a drying container 101, a raw coal charging port 102, a dry coal discharging port 103, and a fluidized steam supply. Section 104 (104a, 104b, 104c), gas discharge port 105, and heat transfer tubes (heating sections) 106, 107, 108.

  The drying container 101 has a hollow box shape, and a raw coal charging port 102 for charging raw coal is formed on one end side, and a dried product obtained by heating and drying raw coal is discharged to the lower portion on the other end side. A dry charcoal discharge port 103 is formed. In this case, the raw coal input port 102 and the dry coal discharge port 103 are provided one by one at the end of the drying container 101, but a plurality of them may be provided. In this case, the drying container 101 can adjust the amount of raw coal supplied from the raw coal inlet 102 to the inside by the coal feeder 22 (see FIG. 5). Moreover, the dry container 101 can adjust raw coal discharge | emission amount by adjusting the rotation speed of the rotary valve which is not shown in the dry charcoal discharge port 103 provided.

  Further, the drying container 101 is provided with a dispersion plate 109 having a plurality of openings at a predetermined distance from the bottom plate 101a in the lower portion, so that the wind box 110 is partitioned. The drying container 101 is provided with a fluidized steam supply unit 104 (104a, 104b, 104c) that supplies fluidized steam (superheated steam) to the bottom plate 101a via the wind box 110 and above the dispersion plate 109. Yes. Further, in the drying container 101, a gas discharge port 105 for discharging fluidized steam and generated steam is formed in the ceiling plate 101b on the dry coal discharge port 103 side.

  The drying vessel 101 is supplied with raw coal from the raw coal inlet 102 and fluidized steam is supplied from the fluidized steam supply unit 104 through the wind box 110 and the dispersion plate 109, so that the dispersion plate 109 A fluidized bed S having a predetermined thickness is formed above, and a free board portion F is formed above the fluidized bed S.

  The drying container 101 includes a first drying chamber 111 provided on the upstream side in the flow direction of the raw coal, a second drying chamber 112 provided on the downstream side of the first drying chamber 111, and raw coal. And the third drying chamber 113 provided on the most downstream side in the flow direction.

  More specifically, in the drying container 101, the fluidized bed S is divided into a plurality of (in this embodiment, two) partition plates 114 and 115 in the flow direction of the raw coal. Charcoal passage openings 116 and 117 are formed. The partition plates 114 and 115 are arranged along a vertical direction orthogonal to the flow direction of the raw coal, and are arranged at predetermined intervals in the flow direction of the raw coal. It is attached to the inner wall surface. And each partition plate 114,115 is located so that a lower end part may be located in the dispersion plate 109 with a predetermined clearance, and an upper end part may be extended upwards from the fluidized bed S. FIG. That is, passage openings 116 and 117 having a predetermined height and width (opening area) are secured between the partition plates 114 and 115 and the dispersion plate 109, and the passage openings 116 and 117 are substantially The same opening area is set.

  As described above, the drying container 101 is divided into the first drying chamber 111, the second drying chamber 112, and the third drying chamber 113 by providing the partition plates 114 and 115. The drying chambers 111, 112, and 113 are In addition, communication is made above the partition plates 114 and 115. In this case, the first drying chamber 111 is a region (preheat drying region) in which the freeboard portion F1 and the fluidized bed S1 are formed and the initial drying of the raw coal is performed. In the second drying chamber 112, a free board portion F2 and a fluidized bed S2 are formed, and the second drying chamber 112 is an area (fixed rate drying area) where the raw coal is dried in the middle period. In the third drying chamber 113, a free board portion F3 and a fluidized bed S3 are formed, and the third drying chamber 113 is a region where the latter drying of raw coal is performed (decrease rate drying region).

  In this case, each of the drying chambers 111, 112, and 113 is set so that the floor area is substantially the same, but may be set to an optimum ratio according to the moisture content of raw coal, for example, 2 It is desirable to set the floor area of the drying chamber 112 to the maximum. That is, the first drying chamber 111 is a preheat drying region in which the drying rate of the raw coal is increased to a predetermined moisture content because the moisture content of the raw coal to be charged is high. Since the drying rate of the raw coal rises to a predetermined drying rate and becomes constant, the second drying chamber 112 is a constant rate drying region where the drying rate of the raw coal becomes constant. Since the drying rate of the raw coal is processed when the moisture content of the raw coal reaches a predetermined moisture content (limit moisture content), the third drying chamber 113 is a reduced rate drying region in which the drying rate of the raw coal decreases. is there. Therefore, the drying efficiency is improved by maximizing the volume of the second drying chamber 112 that is the constant rate drying region.

  The wind box 110 is divided into three wind boxes 110a, 110b, and 110c by partition members 118 and 119 so as to correspond to the three drying chambers 111, 112, and 113, and the three wind boxes 110a, 110b, Three fluidized steam supply sections 104a, 104b, and 104c are provided so as to correspond to 110c. That is, the partition members 118 and 119 are disposed below the partition plates 114 and 115. The fluidized steam supply units 104a, 104b, and 104c are connected to a fluidized steam supply pipe (not shown). By adjusting the opening of the flow rate adjustment valve provided in the fluidized steam supply pipe, the wind box The amount of fluidized steam supplied to 110a, 110b, 110c can be adjusted.

  That is, the drying container 101 is configured as a plug flow system so that the supplied raw coal is pushed out in the room. This extruding flow is a flow for extruding the raw coal in the fluidizing direction so that the raw coal does not diffuse in the fluidizing direction in the fluidized bed S.

  Further, the drying container 101 is provided with a plurality of heat transfer tubes 106, 107, and 108 that pass through the drying container 101 from the outside and circulate in the fluidized beds S1, S2, and S3 in the drying chambers 111, 112, and 113, respectively. Has been. The heat transfer tubes 106, 107, 108 are positioned so as to be embedded in the fluidized beds S1, S2, S3, and the raw coals of the fluidized beds S1, S2, S3 are formed by fluidized steam (superheated steam) flowing inside. Can be dried by heating. In this case, the temperature of the heat transfer tubes 106, 107, 108 can be adjusted by changing the pressure of the supplied superheated steam.

  Therefore, the raw coal supplied to the first drying chamber 111 is fluidized by the fluidized steam and heated by the heat transfer tube 106 to be dried. The raw coal initially dried in the first drying chamber 111 is moved to the second drying chamber 112 through the passage opening 116 below the partition plate 114, and is heated by the heat transfer tube 107 here. Medium-term dry. The raw coal dried in the second drying chamber 112 is moved to the third drying chamber 113 through the passage opening 117 at the bottom of the partition plate 115, where it is heated by the heat transfer tube 108. Late drying.

  Thereby, the raw coal forming the fluidized beds S1, S2, and S3 of the drying chambers 111, 112, and 113 sequentially moves between the fluidized beds S1, S2, and S3 from the upstream side through the passage openings 116 and 117. By doing so, it can be made an extruded flow, and it is dried without being diffused in the flow direction.

  Next, the cooler 31 in the coal gasification combined power generation facility 10 described above will be described in detail.

  The cooler 31 is a fluid cooling device, and as shown in FIG. 3, a cooling vessel 201, a dry coal charging port (heat treated material charging unit) 202, a cooling coal discharging port (coolant discharging unit) 203, , Fluidized gas supply unit 204, gas discharge port 205, and heat transfer tube (cooling unit) 206.

  The cooling container 201 has a hollow box shape, and a dry charcoal inlet 202 for charging dry charcoal dried by the fluidized bed drying device 12 is formed on one end side, and a dry charcoal is formed on the lower end on the other end side. A cooling coal discharge port 203 for discharging the cooling coal after cooling is formed. The dry charcoal inlet 202 is connected to a transfer pipe (heat treatment transfer path) 207 that communicates with the dry charcoal discharge port 103 of the drying vessel 101 in the fluidized bed drying apparatus 12, and a rotary valve 208 is provided in the transfer pipe 207. It has been.

  In addition, the cooling container 201 is provided with a dispersion plate 209 having a plurality of openings in the lower portion, so that the wind box 210 is partitioned. The cooling container 201 is provided with a fluidizing gas supply unit 204 that supplies fluidizing gas (inert gas such as nitrogen gas) to the upper side of the dispersion plate 209 via the wind box 210. Further, the cooling container 201 has a gas discharge port 205 for discharging the fluidized gas and the generated steam at the upper part on the cooling coal discharge port 203 side.

  The cooling vessel 201 is supplied with dry coal from the dry coal inlet 202 and supplied with fluidizing gas from the fluidizing gas supply unit 204 through the wind box 210 and the dispersion plate 209. A fluidized bed Sc having a predetermined thickness is formed above, and a free board portion Fc is formed above the fluidized bed Sc.

  The cooling vessel 201 is provided with a plurality of heat transfer tubes 206 that circulate in the fluidized bed Sc. The heat transfer tube 206 is located so as to be embedded in the fluidized bed Sc, and can cool the dry coal of the fluidized bed Sc with a cooling medium (for example, cooling water) flowing inside. One end of the heat transfer tube 206 is connected to a connecting part 211 provided in the cooling container 201, and the other end is connected to a connecting part 212 provided in the cooling container 201. One end of the water supply pipe 213 is connected to the connection part 211, and a water supply pump 214 and a heat exchanger 215 are provided. One end of the water distribution pipe 216 is connected to the connecting part 212. The heat exchanger 215 performs heat exchange between the cooling water in the water pipe 213 and the heat exchange medium, and cools or heats the cooling water to a predetermined temperature by adjusting the temperature of the heat exchange medium. Can do.

  The cooling container 201 is provided with a cooling pipe 217 that flows a cooling medium (for example, cooling water) along the outer surface. The water supply pipe 213 is provided with a branch portion 218, a branch pipe 219 from the branch portion 218 is connected to one end of the cooling pipe 217, and the water distribution pipe 216 is provided with a branch portion 220. A branch pipe 221 from the section 220 is connected to the other end of the cooling pipe 217.

  The fluidized bed drying device 12 is provided with a moisture content sensor (moisture content detection device) 222 that detects the moisture content (water content) of the dry coal at the dry coal discharge port 103, and the detection result is the control device 223. Is input. The control device 223 can control the drive of the water feed pump 214 and the heat exchanger 215 according to the drying state of the dry coal.

  In this embodiment, the control device (cooling temperature setting device) 223 adjusts the temperature of the cooling water supplied from the water supply pipe 213 to the heat transfer pipe 206 to be higher than the dew point temperature in the cooling container 201. That is, the control device 223 changes the temperature of the cooling water according to the moisture content of the dry coal so that the temperature of the cooling water is higher than the dew point temperature in the cooling vessel 201.

  In this case, if the flow rate (flow rate) of the fluidizing gas supplied to the cooling container 201 by the fluidizing gas supply unit 204 is constant, the pressure in the cooling container 201 becomes constant. The temperature is known in advance by experiments or the like without measuring. However, when the operating state of the cooler 31 changes, that is, when the flow rate (flow rate) of the fluidizing gas supplied to the cooling vessel 201 by the fluidizing gas supply unit 204 is changed, the pressure in the cooling vessel 201 is changed. Fluctuates, the dew point temperature in the cooling vessel 201 also changes. In such a case, a dew point meter may be provided in the cooling container 201.

And the control apparatus 223 has a control map as shown in FIG. 4, and sets the optimal temperature of cooling water using this control map from the moisture content of the dry coal which the moisture rate sensor 222 detected. The control map, which has previously determined by experiments, and the dew point temperature T _D in the cooling vessel 201 in accordance with the moisture content of the dry coal, by setting the upper temperature limit T _L of the cooling water, the dry coal An appropriate temperature region (shaded area in FIG. 4) of the cooling water according to the moisture content is set.

  Therefore, the control device 223 sets the optimum temperature of the cooling water using the control map from the moisture content of the dry coal detected by the moisture sensor 222, and controls the heat exchanger 215 to transmit power from the water pipe 213. The temperature of the cooling water supplied to the heat pipe 206 is adjusted.

  At this time, since the water supply pipe 213 is connected to the cooling pipe 217 via the branch pipe 219, the control device 223 uses this control map from the moisture content of the dry coal detected by the moisture sensor 222. The optimum temperature of the cooling water is set, and the temperature of the cooling water supplied from the water supply pipe 213 to the cooling pipe 217 is also adjusted by driving and controlling the heat exchanger 215.

  Further, the cooling container 201 has a gas injection pipe 224 connected to the transfer pipe 207 and a flow rate adjustment valve 225. The gas injection pipe 224 is, for example, an inert gas supply device that supplies an inert gas (for example, nitrogen gas) to the transfer pipe 207, and is connected to a nitrogen tank (not shown).

  Here, the entire operation of the fluidized bed drying apparatus 12 and the cooler 31 of this embodiment will be described.

  In the fluidized bed drying device 12, as shown in FIGS. 1 and 2, the raw coal is supplied from the raw coal inlet 102 to the drying container 101 and flows from the fluidized steam supply unit 104 through the dispersion plate 109. When the vaporized steam is supplied, fluidized beds S1, S2, and S3 having a predetermined thickness are formed above the dispersion plate 109. The raw coal moves through the fluidized beds S1, S2, and S3 to the dry coal discharge port 103 side by the fluidized steam, and at this time, the raw coal is heated and dried by receiving heat from the heat transfer tubes 106, 107, and 108.

  That is, when raw coal is supplied from the raw coal inlet 102, first, in the first drying chamber 111, fluidized steam is supplied from the fluidized steam supply unit 104 a through the dispersion plate 109, and heat is transferred from the heat transfer tube 106. By receiving, it is dried while flowing in the fluidized bed S1. Next, the raw coal that has been initially dried in the first drying chamber 111 flows into the second drying chamber 112 through the passage opening 116 of the partition plate 114. In the second drying chamber 112, fluidized steam is supplied from the fluidized steam supply unit 104 b through the dispersion plate 109 and receives heat from the heat transfer tube 107, so that it is dried while flowing in the fluidized bed S <b> 2. The raw coal that has been subjected to medium-term drying in the second drying chamber 112 flows into the third drying chamber 113 through the passage opening 117 of the partition plate 115. In the third drying chamber 113, fluidized steam is supplied from the fluidized steam supply unit 104c through the dispersion plate 109, and is also dried while flowing in the fluidized bed S3 by receiving heat from the heat transfer tube. In this way, the raw coal flows in the fluidized beds S1, S2, S3 by the fluidized steam supplied while being heated by the heat transfer tubes 106, 107, 108, and diffuses in the flow direction as an extruded flow. Without drying.

  Thereafter, the dry coal from which the raw coal has been dried is discharged to the outside through the dry coal discharge port 103, and the steam generated by heating and drying the raw coal in the fluidized bed S rises together with the fluidized steam. It flows to the discharge port 103 side and is discharged from the gas discharge port 105 to the outside.

  The raw coal heated and dried by the fluidized bed drying device 12 is sent to the cooler 31 as dry coal. In this cooler 31, as shown in FIG. 3, dry coal is supplied from the dry coal inlet 202 to the cooling container 201, and nitrogen gas is supplied from the fluidizing gas supply unit 204 through the dispersion plate 209. Thus, a fluidized bed Sc having a predetermined thickness is formed above the dispersion plate 209. The dry coal moves through the fluidized bed Sc to the cooling coal discharge port 203 side by the fluidizing gas, and at this time, the heat transfer pipe 206 is deprived of heat and cooled. Thereafter, the cooled coal after the dried coal is cooled is discharged to the outside from the cooled coal discharge port 203, and the steam generated from the dried coal in the fluidized bed Sc rises together with the fluidized gas and is discharged to the outside from the gas discharge port 205. Is done.

  At this time, the moisture content sensor 222 detects the moisture content of the dry coal discharged from the dry coal discharge port 103 of the fluidized bed drying apparatus 12, that is, the dry coal charged from the dry coal injection port 202 of the cooler 31. The detection result is output to the control device 223. The control device 223 sets the optimum temperature of the cooling water based on the moisture content of the dry coal and the control map shown in FIG. 4, and adjusts the temperature of the cooling water flowing through the water supply pipe 213 by driving and controlling the heat exchanger 215. To do. Specifically, the temperature of the cooling water is adjusted to be higher than the dew point temperature in the cooling container 201.

  Then, the cooling water adjusted to an appropriate temperature is supplied from the water supply pipe 213 to the heat transfer pipe 206, cools the dry coal of the fluidized bed Sc, and then is discharged to the water distribution pipe 216. Further, the cooling water adjusted to an appropriate temperature is supplied from the water supply pipe 213 to the cooling pipe 217, cooled by the cooling container 201, and then discharged to the water distribution pipe 216. Furthermore, before the dry coal is introduced into the cooling container 201 from the dry coal inlet 202, the partial pressure of water vapor is reduced by supplying the inert gas from the gas injection pipe 224 to the transfer pipe 207. Since the dry charcoal after heat drying has a high temperature, even if it is put into the cooling vessel 201, water vapor is generated. However, since the temperature of the cooling water is higher than the dew point temperature in the cooling vessel 201, the water vapor generated from the high-temperature dry coal does not condense, and the generation of lumps due to the adhesion of the dry coal is prevented.

  Thus, in the cooling device for the heat-treated product of the present embodiment, a cooling vessel 201 having a hollow shape in which a dry coal charging unit 202 is provided on one end side and a cooling coal discharge port 203 is provided on the other end side, A fluidized gas supply unit 204 that forms a fluidized bed Sc together with dry coal by supplying fluidized gas to the cooling vessel 201, and a heat transfer tube 206 that cools the dried coal in the fluidized bed Sc by circulating cooling water therein. And a control device 223 for setting the temperature of the cooling water to be higher than the dew point temperature in the cooling vessel 201.

  Therefore, when the fluidizing gas supply unit 204 supplies the fluidizing gas into the cooling vessel 201, the dry coal moves through the fluidized bed Sc and causes the cooling water to circulate inside the heat transfer pipe 206. The dry charcoal constituting is cooled. At this time, by setting the temperature of the cooling water to be higher than the dew point temperature in the cooling vessel 201, the water vapor generated from the dry coal does not condense, preventing the generation of a lump due to the adhesion of the dry coal, As a result, it is possible to prevent poor flow of dry coal or cooling coal in the fluidized bed Sc.

  Moreover, in the cooling device for the heat-treated product of the present embodiment, the control device 223 determines the moisture content of the dry coal before being introduced into the cooling vessel 201 so that the temperature of the cooling water is higher than the dew point temperature in the cooling vessel 201. It is changed according to. Therefore, the temperature of the cooling water is changed to an optimum temperature according to the moisture content of the dry coal charged into the cooling vessel 201, and condensation of water vapor generated from the dry coal can be prevented appropriately.

  Further, in the cooling device for the heat-treated product of the present embodiment, the cooling pipe 217 that flows the cooling water is provided along the outer surface of the cooling container 201, and the control device 223 has the temperature of the cooling water flowing through the cooling pipe 217 being the cooling container. The temperature is changed to be higher than the dew point temperature in 201. Therefore, regardless of the temperature outside the cooling vessel 201, the condensation of water vapor generated from the dry coal can be suppressed, and the generation of lumps due to the adhesion of the dry coal can be prevented.

  Further, in the heat treatment product cooling apparatus of the present embodiment, a gas injection pipe 224 for supplying an inert gas to the transfer pipe 207 connected to the dry coal charging port 202 is provided. Therefore, by supplying an inert gas to the conveying pipe 224, it becomes possible to reduce the partial pressure of water vapor, suppress the condensation of water vapor generated from the dry coal, and prevent the generation of lumps due to the adhesion of the dry coal. can do.

  In the above-described embodiment, the inside of the cooling container 201 is configured as one cooling chamber, but a plurality of cooling chambers may be used like a drying container. Further, the configuration and arrangement of the shape of the cooling vessel 201, the dry coal inlet 202, the cooling coal outlet 203, the fluidized gas supply unit 204, the gas outlet 205, and the heat transfer tube 206 are not limited to the embodiment. However, it can be appropriately changed according to the installation location or application of the cooler 31.

  In the above-described embodiment, the control device 223 controls the heat exchanger 215 based on the moisture content of the dry coal detected by the moisture sensor 222 and the control map shown in FIG. Although the optimum temperature is adjusted, the present invention is not limited to this configuration. That is, when the properties of the raw coal dried by the fluidized bed drying device 12 are stable, the moisture content of the dried coal discharged from the fluidized bed drying device 12 is also stable, and the moisture content sensor 222 is unnecessary. Become. For this reason, the temperature of the cooling water supplied to the heat transfer tube 206 may be set in advance so that the temperature of the cooling water supplied to the heat transfer tube 206 is higher than the dew point temperature in the cooling vessel 201. The adjustment function of the exchanger 215 becomes unnecessary.

  In the above-described embodiments, low-grade coal is used as the wet fuel, but even high-grade coal can be applied, and is not limited to coal, and can be used as a renewable organic organic resource. For example, it is also possible to use thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets or chips) using these as raw materials.

DESCRIPTION OF SYMBOLS 11 Coal feeder 12 Fluidized bed dryer 13 Pulverized coal machine 14 Coal gasifier 15 Char recovery device 16 Gas refiner 17 Gas turbine equipment 18 Steam turbine equipment 19 Generator 20 Waste heat recovery boiler 101 Drying vessel 102 Raw coal input 103 Dry coal discharge port 104 Fluidized steam supply unit 105 Gas discharge port 106, 107, 108 Heat transfer tube (heating unit)
111 First drying chamber 112 Second drying chamber 113 Third drying chamber 114, 115 Partition plate 116, 117 Passing opening 201 Cooling vessel 202 Dry coal inlet 203 Cooling coal outlet 204 Fluidizing gas supply portion 205 Gas outlet 206 Heat transfer tube (cooling section)
207 Transfer piping (heat treatment transfer path)
213 Water supply pipe 215 Heat exchanger 216 Water distribution pipe 217 Cooling pipe 222 Moisture content sensor (moisture content detection device)
223 Control device (cooling temperature setting device)
224 Gas injection pipe (inert gas supply device)
F, F1, F2, F3, Fc Free board part S, S1, S2, S3, Sc Fluidized bed

Claims (5)

A cooling container having a hollow shape in which a heat-treated product input part is provided on one end side and a coolant discharge part is provided on the other end side;
A fluidized gas supply unit that forms a fluidized bed together with the heat-treated product by supplying a fluidized gas to the cooling container;
A cooling section for cooling the heat-treated product of the fluidized bed by circulating a cooling medium inside the heat transfer tube;
A cooling temperature setting device for setting the temperature of the cooling medium to be higher than the dew point temperature in the cooling container;
An apparatus for cooling a heat-treated product, comprising:   The said cooling temperature setting apparatus changes according to the moisture content of heat processed material so that the temperature of a cooling medium may become higher than the dew point temperature in the said cooling container, The cooling device of heat processed material of Claim 1 characterized by the above-mentioned. .   A moisture content detecting device for detecting the moisture content of the heat treated material charged from the heat treated material charging unit and a heat exchanger capable of adjusting the temperature of the cooling medium are provided, and the cooling temperature setting device includes the moisture content detecting device. The apparatus for cooling a heat-treated product according to claim 1 or 2, wherein the temperature of the cooling medium is adjusted by the heat exchanger based on the detected moisture content of the heat-treated product.   A cooling pipe that flows the cooling medium along the outer surface of the cooling container is provided, and the cooling temperature setting device changes the temperature of the cooling medium that flows through the cooling pipe to be higher than the dew point temperature in the cooling container. The apparatus for cooling a heat-treated product according to any one of claims 1 to 3, wherein:   The cooling of the heat-treated material according to any one of claims 1 to 4, further comprising an inert gas supply device that supplies an inert gas to a heat-treated material conveyance path connected to the heat-treated material charging unit. apparatus.

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