WO2020054089A1

WO2020054089A1 - Apparatus for cooling gasified gas and removing tar

Info

Publication number: WO2020054089A1
Application number: PCT/JP2019/000489
Authority: WO
Inventors: 伊藤　信三
Original assignee: 株式会社ユーリカエンジニアリング
Priority date: 2018-09-14
Filing date: 2019-01-10
Publication date: 2020-03-19
Also published as: JPWO2020054059A1; WO2020054059A1

Abstract

This apparatus main body for cooling a gasified gas and removing tar comprises: a cooling device that cools high-temperature gasified gas to a medium temperature; a water spraying device that sprays steam or spray water into the gasified gas cooled to the medium temperature to make the gasified gas cooled to the medium temperature contain the steam therein; a cooling and condensing device that cools the gasified gas containing the steam to a low temperature, condenses tar and the steam, and drops the condensed tar and steam into turbid liquid stored in a storage part; a liquid level holding device that holds a liquid level of the turbid liquid stored in the storage part at a predetermined position; and a gas cooling/cooling heat recovery circuit that supplies cooling water to an inlet of a condensing coil of the cooling and condensing device, supplies the steam flowing out of an outlet to an inlet of a cooling coil of the cooling device, and supplies superheated steam flowing out of the outlet to a superheated steam using device.

Description

Gasification gas cooling and tar removal equipment

The present invention relates to an apparatus for cooling a gasified gas and removing tar contained in the gasified gas.

Patent Document 1 discloses a tar removing apparatus that removes tar contained in a gasified gas by reforming with a high-temperature catalyst. According to this, tar contained in the gasification gas generated in the biomass gasification furnace is reformed into carbon monoxide and hydrogen gas by coming into contact with the high-temperature catalyst in the tar cracking device. The high-temperature gasified gas of about 600 to 800 ° C. discharged from the tar decomposition apparatus is cooled to about 200 ° C. by a boiler, and low-temperature precipitated dusts such as salts precipitated at this time are removed by a bag filter. The tar deposited from the gasified gas cooled to 150 ° C. or lower by the bag filter adheres to the wall surface when passing through the washing tower and is removed.

Patent Document 2 discloses a tar removing device that prevents the heat exchanger from deteriorating the heat exchange performance due to the adhesion of tar. According to this, an appropriate amount of water is sprayed by the water spray device 35 into the generated gas storage space in the container 31 of the heat exchanger 3. The heat transfer surface of the cooling pipe 34 of the heat exchanger 3 is cleaned by the spray water and the condensed water, preventing the condensed tar from adhering to the heat transfer surface, and maintaining the heat exchange performance of the cooling pipe 34. be able to.

JP 2009-185154 A JP 2010-229206 A

As described above, there is known a device for decomposing, reforming and removing tar contained in a high-temperature gasified gas with a catalyst or the like, and also cooling the boiler. However, such an apparatus has problems in terms of thermal efficiency, degree of achievement of tar removal, and simplicity. That is, in the tar removal apparatus described in Patent Document 1, since only a large amount of tar remains in the gasification gas by simply removing the tar with a high-temperature catalyst in the tar decomposition apparatus, the gasification at a high temperature of 600 to 800 ° C. When the gas is cooled to about 200 ° C. by the boiler, there is a concern that tar adheres to the wall surface of the boiler and the efficiency is reduced. In addition, the gasified gas is passed through a bag filter to remove dust that precipitates when cooled. The tar remaining in the gasified gas that has passed 150 ° C. or less after passing through the bag filter is removed by the washing tower, but the tar adhering to the wall of the washing tower removes the ultrasonically applied water from the tangential direction to the wall. Must be removed by spraying. Furthermore, in the tar removing device described in Patent Literature 2, use of waste heat obtained by cooling the produced gas is not considered.

The present invention provides a gasification gas cooling and tar removing device that efficiently cools a high-temperature gasification gas generated in a gasification furnace and that can efficiently use superheated steam obtained when cooling the gasification gas. The purpose is to provide.

The present invention relates to an apparatus main body, a cooling device for cooling a high-temperature gasified gas to a medium temperature, a water spraying device for including the steam in the gasified gas cooled to the medium temperature, and a gasification device including the steam. A cooling / condensing device that cools the gas to a low temperature, condenses tar and water vapor, and drops into a turbid liquid of the water and tar stored in the storage unit, and a liquid surface of the turbid liquid stored in the storage unit. A gasified gas cooling and tar removing device comprising a liquid level holding device for holding the gasified gas at a position, and a gas cooling / cooling heat recovery circuit utilizing superheated steam obtained at the time of cooling the gasified gas.

The apparatus body has an inlet through which the high-temperature gasified gas flows from the gasifier, an outlet through which the gasified gas cooled to a low temperature and from which tar has been removed flows out, and an outlet through which the gas flows from the inlet. A cylindrical passage for guiding the gasified gas flowing toward an outlet, and a recess formed on the bottom of the passage on the outlet side for storing a condensed liquid of condensed water and tar; And a storage unit provided with a drain hole for discharging the turbid liquid.
The cooling device is provided at the inlet side in the passage of the device main body so that the high-temperature gasified gas flowing from the inlet passes therethrough, and the high-temperature gasified gas is set at an intermediate temperature. Cooling. The water spraying device is provided on the outlet side along with the cooling device in the passage of the device main body so that the gasified gas cooled to the intermediate temperature by the cooling device passes therethrough, Water vapor or spray water is sprayed on the gasified gas cooled to the medium temperature, so that the gasified gas cooled to the medium temperature contains a large amount of water vapor to make a state rich in water vapor. The cooling and condensing device is provided on the outlet side in the passage of the device main body so as to pass the gasified gas that has passed through the water spraying device, along with the blowing device, The gasification gas containing water vapor is cooled to a low temperature by the attachment device, and the tar and water vapor contained in the gasification gas are condensed and dropped into the turbid liquid stored in the storage section to be removed. The liquid level holding device holds the liquid level of the turbid liquid stored in the storage section at a predetermined position. The gas cooling / cooling heat recovery circuit supplies cooling water supplied from a water supply device to an inlet of a cooling / condensing coil of the cooling / condensing device, and feeds steam flowing out of an outlet of the cooling / condensing coil to an inlet of the cooling coil. The superheated steam supplied and flowing out of the outlet of the cooling coil is supplied to a superheated steam utilization device.

筒 The cylindrical passage may be provided horizontally in the apparatus main body, or may be provided vertically. When provided horizontally, the cooling and condensing device is positioned such that a lower end surface thereof is lower than a liquid surface of the turbid liquid stored in the storage unit.

According to such a configuration, the high-temperature gasified gas is cooled to the medium temperature by the cooling device, and the gasified gas cooled to the medium temperature and made into the steam-rich state by the water spray device is cooled to the low temperature by the cooling / condensing device. The gas cooling / cooling heat recovery circuit supplies cooling water supplied from a water supply device to an inlet of a cooling condensing coil of the cooling condensing device and cools water vapor flowing out from an outlet of the cooling condensing coil to the cooling device. Superheated steam supplied to an inlet of the coil and flowing out of an outlet of the cooling coil is supplied to a superheated steam utilization device. Thereby, the superheated steam obtained when the high temperature gasified gas is cooled to a low temperature can be efficiently used.

Furthermore, since the gasification gas cooled to the medium temperature by the cooling device is sprayed with water vapor or spray water by the water spraying device to make the gaseous gas rich, the gaseous gas at the medium temperature can be enriched in a water vapor rich state with a simple configuration. Can be The tar condensed by cooling the steam-rich gasified gas by the cooling and condensing device falls down and is removed in a state where it is covered with water vapor and water and does not easily adhere to the wall surface. It is possible to prevent the cooling function of the cooling / condensing device from being reduced by adhering to the outer surface of the condensing coil. Accordingly, the high-temperature gasified gas can be efficiently cooled, and the tar contained in the high-temperature gasified gas can be efficiently removed with a simple configuration.

It is a block diagram showing the whole composition of a 1st embodiment of a cooling and tar removal device of gasification gas. It is a block diagram showing the whole composition of the gasification gas cooling and tar removal device which used another example for the liquid surface maintenance device in a 1st embodiment. It is a block diagram which shows the whole structure of 2nd Embodiment of the cooling and tar removal apparatus of a gasification gas. It is a block diagram showing the whole composition of a 3rd embodiment of a gasification gas cooling and tar removal device.

1. Configuration of First Embodiment As shown in FIG. 1, a gasification gas cooling and tar removing device 1 according to a first embodiment includes a device main body 10 and a cooling device 20 for cooling a high temperature gasification gas to an intermediate temperature. A water spraying device 30 for containing water vapor in a gasified gas cooled to an intermediate temperature; cooling the gasified gas containing water vapor to a low temperature to condense the tar and water vapor to form tar and water stored in the storage unit 14; , An eliminator 50 that collects tar and water remaining after being carried over by the gasified gas that has passed through the cooling condenser 40, and a turbid liquid 16 stored in the storage unit 14. A liquid level holding device 60 for holding the liquid level 17 at a predetermined position, and a gas cooling / cooling heat recovery circuit 70 for cooling gasified gas and recovering cooling heat.

The apparatus main body 10 is a housing in which a horizontally long passage 11 is formed and the outer periphery is covered with a heat insulating material. An inlet 12 through which a high-temperature gasified gas flows from the gasification furnace 2 is formed at an upstream end face of the passage 11, and a gasified gas cooled to a low temperature and from which tar has been removed flows out at a downstream side. Outlet 13 is formed. The passage 11 has a horizontal cylindrical shape, and guides the gasified gas flowing in the gas flow direction 18 from the inlet 12 to the outlet 13. On the bottom surface of the passage 11, which is the lower plate of the apparatus main body 10, a concave storage portion 14 for storing a turbid liquid 16 in which condensed water and tar are mixed is formed over a predetermined range on the outlet 13 side. ing. A drain hole 15 for discharging the turbid liquid 16 is formed in a lower portion of the storage unit 14. The bottom surface of the storage part 14 is inclined so that the drain hole 15 is at a low position. The gasification furnace 2 is a known device that generates gasification gas from biomass, preferably woody biomass, such as thinned wood, waste wood, rice straw, straw, rice husk, and corn.

The cooling device 20 is provided in the passage 11 of the apparatus main body 10 on the side of the inlet 12 so that the high temperature (for example, 800 ° C.) gasified gas flowing from the inlet 12 passes therethrough. There is no gap between the outer peripheral surface of the cooling device 20 in the gas flow direction 18 and the inner peripheral surface of the passage 11, and all the gasified gas flowing from the inlet 12 passes through the cooling device 20. The cooling device 20 is provided with a cooling coil 21 therein, and cools a high-temperature gasified gas to a medium temperature while steam flowing from an inlet 22 of the cooling coil 21 flows through the cooling coil 21 and flows out from an outlet 23. The medium temperature is above the condensation temperature of most types of tar, for example 400-500 ° C.

The water spraying device 30 includes a water supply device 71, a cooling / condensing coil 41 of the cooling / condensing device 40, a water vapor spraying unit 31, a pipe 72 connecting the water supplying device 71 to the inlet 42 of the cooling / condensing coil 41, A pipe 73 connects the outlet 43 of the coil 41 to the inlet 32 of the steam spray unit 31. The steam spray unit 31 is provided in the passage 11 of the apparatus main body 10 at the outlet 13 side along with the cooling device 20 so that the gasified gas cooled to a medium temperature by the cooling device 20 passes therethrough. There is no gap between the outer peripheral surface in the gas flow direction 18 of the steam blower 31 and the inner peripheral surface of the passage 11, and all the gasified gas that has passed through the cooling device 20 passes through the steam blower 31. The steam blowing section 31 is supplied with steam having a spraying temperature lower than the medium temperature (for example, 250 to 300 ° C.) from the inlet 32 to the gasified gas cooled to the medium temperature, and converts the steam at the spraying temperature into the gasified gas having the medium temperature. To make the gasified gas contain steam so as to be in a steam rich state. The water spraying device 30 sends the steam at the spraying temperature toward the middle-temperature gasified gas that flows through the passage 11 in the downstream direction through the cooling device 20 from the steam blowing portion 31 evenly in a substantially horizontal direction from the downstream side. Spray. In addition, the water spraying device 30 may spray the steam at the spraying temperature from the steam spraying unit 31 almost uniformly in the horizontal direction from the upstream side to the middle-temperature gasified gas flowing in the passage 11 in the downstream direction. .

The cooling and condensing device 40 is provided in the passage 11 of the device main body 10 at the outlet 13 side along with the water spray device 30 so that the gasified gas that has passed through the water spray device 30 passes therethrough. The cooling / condensing device 40 is disposed above the storage unit 14, and the lower end surface of the cooling / condensing device 40 is positioned below the liquid level 17 of the turbid liquid 16 stored in the storage unit 14. Accordingly, there is no gap between the inner peripheral surface of the area defined by the inner peripheral surface except the lower surface of the passage 11 and the liquid surface 17 and the outer peripheral surface in the gas flow direction 18 of the cooling / condensing device 40, All of the gasified gas that has passed through the attachment device 30 passes through the cooling and condensing device 40. The cooling condensing device 40 is provided with a cooling condensing coil 41 therein, and the water flowing in from the inlet 42 of the cooling condensing coil 41 becomes steam while flowing through the cooling condensing coil 41 and flows out from the outlet 43. The gasified gas which is blown with steam and cooled slightly below the medium temperature and flows downstream is cooled to a low temperature of, for example, 50 ° C. Since the gasification gas becomes lower than the condensation temperature of tar and water while passing through the cooling condenser 40, the tar and water vapor contained in the gasification gas condense and flow downward along the outer surface of the cooling condensation coil 41. , Falls into the turbid liquid 16 stored in the storage unit 14 and is removed from the gasified gas.

The eliminator 50 is provided in the passage 11 of the apparatus main body 10 at the outlet 13 side along with the cooling and condensing device 40 so that the gasified gas that has passed through the cooling and condensing device 40 passes therethrough. The eliminator 50 is disposed above the storage unit 14, and the lower end surface of the eliminator 50 is positioned below the liquid level 17 of the turbid liquid 16 stored in the storage unit 14. As a result, there is no gap between the inner peripheral surface of the area defined by the inner peripheral surface excluding the lower surface of the passage 11 and the liquid surface 17 and the outer peripheral surface of the eliminator 50 in the gas flow direction 18. All the gasified gas that has passed through passes through the eliminator 50. The eliminator 50 is provided with a number of corrugated plates 51 arranged side by side so that the vertical side edges of the adjacent corrugated plates 51 overlap with a gap in the gas flow direction 18. While the gasified gas from which the water vapor has been removed passes, tar and water remaining in the gasified gas that are carried over are collected, and the turbid liquid stored in the storage unit 14 along the outer surface of the corrugated plate 51 is collected. Drop into 16. The gasified gas that has passed through the eliminator 50 is sent from the gasified gas cooling and tar removing device 1 to the dust collecting device 3 via the outlet 13, and finally the dust is removed. The tar-free gasified gas thus obtained is used in the gas use device 4. The gas using device 4 uses gasified gas for liquid fuel conversion, power generation turbine drive, and the like.

The liquid level holding device 60 is provided in the liquid level gauge 61 for detecting the liquid level 17 of the turbid liquid 16, the pipe 62 for connecting the drain hole 15 to the tar collecting device 5, and the pipe 62. The electromagnetic valve 63 that communicates with and shuts off the solenoid valve 63 controls the opening and closing of the electromagnetic valve 63 in accordance with the detection signal of the liquid level gauge 61 to maintain the liquid level 17 of the turbid liquid 16 stored in the storage unit 14 at a predetermined position. And a control device 64 that performs the control. The turbid liquid 16 of tar and water sent from the cooling and tar removing device 1 to the tar collecting device 5 via the pipe 62 is separated into tar and water by the tar collecting device 5. The separated tar is used as an auxiliary fuel in a boiler combustion furnace 6 or the like. The separated water is treated as wastewater by the wastewater treatment device 7.

The gas cooling / cooling heat recovery circuit 70 includes a water supply device 71, a pipe 72 connecting the water supply device 71 to an inlet 42 of the cooling / condensing coil 41 of the cooling / condensing device 40, a cooling / condensing coil 41, and an outlet of the cooling / condensing coil 41. A pipe 74 connects the 43 to the inlet 22 of the cooling coil 21 of the cooling device 20, a cooling coil 21, and a pipe 76 that connects the outlet 23 of the cooling coil 21 to the superheated steam utilization device 75. The water supply device 71 controls the flow rate of water supplied according to the amount of heat per unit time of the high-temperature gasified gas supplied from the gasification furnace 2, and balances the heat of the gasified gas cooling and tar removing device 1. I'm trying. In the water supply device 71, condensed water of the steam turbine and soft treated water may be used.

In the first embodiment, the eliminator 50 is provided downstream of the cooling / condensing device 40. However, when the amount of tar remaining in the gasified gas that has passed through the cooling / condensing device 40 is equal to or less than an allowable value, or When the tar remaining after being carried over by the gasified gas that has passed through the condenser 40 is separately removed after the gasified gas cooling and tar removing device 1, the eliminator 50 is not required.

2. Operation of the First Embodiment The high temperature gasified gas generated in the gasification furnace 2 flows into the passage 11 from the inlet 12 of the apparatus main body 10 and passes through the cooling device 20. In the cooling coil 21 of the cooling device 20, a part of the steam heated to the spraying temperature in the cooling condensing coil 41 of the cooling condensing device 40 flows through the pipe 74 until it is supplied from the inlet 22 through the pipe 74 and flows out from the outlet 23. Therefore, the high-temperature gasified gas exchanges heat with steam during contact with the cooling coil 21 and is cooled to a medium temperature. The superheated steam flowing out of the outlet 23 is sent to the superheated steam utilization device 75. The superheated steam can be used as a gasifying agent in driving a steam turbine or in a gasifier.

{Circle around (5)} Cooling / condensing coil 41 of cooling / condensing device 40 is supplied with water at a temperature lower than the aforementioned low temperature (for example, a maximum of 40 ° C) from inlet 42 from water supply device 71. The water supply device 71 supplies water at a flow rate that balances the heat of the gasification gas cooling and the tar removal device 1 in consideration of the amount of heat per unit time of the high temperature gasification gas. The water supplied from the water supply device 71 exchanges heat with the gasified gas slightly cooled from the medium temperature in the cooling and condensing device 40 to become steam at the spraying temperature and flows out from the outlet 43. A part of the steam at the spraying temperature flowing out from the outlet 43 of the cooling condensing coil 41 is sent to the inlet 22 of the cooling coil 21 of the cooling device 20 via the pipe 74.

In the water spray device 30, the water supplied from the water supply device 71 becomes steam at the spraying temperature while flowing through the cooling and condensing coil 41 of the cooling and condensing device 40, flows out of the outlet 43, and flows out of the outlet 43. The other part of the steam at the temperature is sent to the inlet 32 of the steam spray unit 31 through the pipe 73. The water spraying device 30 blows steam at a spraying temperature from a nozzle provided in the steam spraying unit 31 onto the gasified gas that has passed through the cooling device 20 and has been cooled to a medium temperature. As a result, the gasified gas at a medium temperature is slightly cooled, becomes a gasified gas rich in water vapor, and flows into the cooling and condensing device 40.

(4) The gasified gas rich in water vapor is cooled to a low temperature (for example, about 50 ° C.) by exchanging heat with water vapor and water while being in contact with the cooling condensation coil 41. During this time, tar and steam contained in the steam-rich gasified gas become lower than their respective condensation temperatures and condense. The condensed tar and water travel along the outer surface of the cooling condensing coil 41 and fall into the turbid liquid 16 of water and tar stored in the storage unit 14. At this time, the condensed tar is in a steam-rich environment, so that the tar is prevented from being covered with water vapor or water and adhering to the outer surface of the cooling and condensing coil 41, and the cooling function of the cooling and condensing device 40 is not reduced.

(4) The low-temperature gasified gas that has passed through the cooling and condensing device 40 is carried over in the gas while passing through the eliminator 50, and the remaining tar and water are collected. The collected tar and water travel down the outer surface of the corrugated plate 51 and fall into the turbid liquid 16 stored in the storage unit 14. Since the tar is covered with water and hardly adheres to the wall and falls down and is removed in the eliminator, it is possible to prevent tar from adhering to the outer surface of the corrugated plate 51 and deteriorating the function of the eliminator. it can. The gasified gas that has passed through the eliminator 50 is sent out from the outlet 13 to the dust collector 3 and becomes a tar-free gasified gas, which is used for liquid fueling, power generation turbine driving, and the like.

The liquid level 17 of the turbid liquid 16 stored in the storage section 14 is measured by a liquid level gauge 61, and the turbid liquid 16 is discharged from the bottom by opening and closing the solenoid valve 63, whereby the liquid level 17 is held at a predetermined position. You. Thereby, the lower end surfaces of the cooling and condensing device 40 and the eliminator 50 are positioned below the liquid surface 17 of the turbid liquid 16. When the liquid level 17 becomes higher than a predetermined position, the solenoid valve 63 is opened, and the turbid liquid 16 flows on the bottom surface inclined toward the drain hole 15 and is discharged from the drain hole 15. When the liquid level 17 reaches a predetermined position, the solenoid valve 63 closes. Since tar has a higher specific gravity than water, in the turbid liquid 16 stored in the storage unit 14, the ratio of tar to water increases toward the bottom of the storage unit. The turbid liquid 16 sent from the storage unit 14 to the tar collecting device 5 is separated into tar and water by the tar collecting device 5. The separated tar is used as auxiliary fuel in a boiler combustion furnace 6 or the like, and the separated water is treated by a wastewater treatment device 7.

When the eliminator 50 is not provided, the gasified gas from which the tar and the water vapor are condensed and removed by the cooling and condensing device 40 flows out of the outlet 13 of the device body 10 to the outside, and the amount of the remaining tar is below the allowable value. It is used in a gas-using device that uses a gasified gas. Alternatively, the gas is sent to the gas use device 4 via an eliminator and a dust collecting device which are separately provided as necessary to remove tar and water carried over, and is used for liquid fuel conversion, power generation turbine drive, and the like.

In the first embodiment, the liquid level holding device 60 controls the opening and closing of the electromagnetic valve 63 in accordance with the detection signal of the liquid level meter 61 to set the liquid level 17 of the turbid liquid 16 stored in the storage section 14 to a predetermined level. Position, but is not limited to this. For example, as shown in FIG. 2, the atmosphere chamber 65 is partitioned into the storage section 14 around the drain hole 15, and the lower end of the wall 66 that separates the storage section 14 from the atmosphere chamber 65 is slightly separated from the bottom surface of the storage section 14. Thereby, the storage unit 14 and the atmosphere chamber 65 are communicated near the bottom surface of the storage unit 14. Then, a cylinder 67 having a height lower than the liquid level 17 by the difference H may be provided upright on the bottom surface of the storage section 14 so as to surround the drain hole 15 in the atmosphere chamber 65. The difference H is set based on the negative pressure near the outlet 13 of the passage 11 and the specific gravity of the turbid liquid in order to maintain the liquid level of the turbid liquid 16 at a predetermined position.

3. Effects of the First Embodiment A high-temperature gasified gas is cooled to a medium temperature by the cooling device 20, and the gasified gas cooled to the medium temperature is sprayed with water vapor by the water spraying device 30 to make the gas rich in water vapor. The gas cooling / cooling heat recovery circuit 70 supplies the cooling water supplied from the water supply device 71 to the inlet 42 of the cooling / condensing coil 41 of the cooling / condensing device 40 in order to cool the liquefied gas to a low temperature by the cooling / condensing device 40. The steam flowing out of the outlet 43 of the cooling condensing coil 41 is supplied to the inlet 22 of the cooling coil 21 of the cooling device 20, and the superheated steam flowing out of the outlet 23 of the cooling coil 21 is supplied to the superheated steam utilization device 75. Thereby, the superheated steam obtained when the high temperature gasified gas is cooled to a low temperature can be efficiently used.

Further, the gasification gas cooled to the medium temperature by the cooling device 20 is sprayed with water vapor by the water spray device 30 to make the gaseous gas rich in water vapor. It can be in a state. Then, the steam-rich gasified gas is cooled by the cooling and condensing device 40, so that tar and steam are condensed and fall into the turbid liquid 16 below. The condensed tar falls down and is removed in a state where it is hardly adhered to the wall surface because it is covered with water vapor or water, so that the tar adheres to the outer surface of the cooling condensing coil 41 and lowers the cooling function of the cooling condensing device 40. It is possible to prevent the high temperature gasified gas from being cooled efficiently and to efficiently remove tar contained in the high temperature gasified gas with a simple configuration.

In the first embodiment, since the eliminator 50 is provided on the outlet 13 side in the passage 11 of the apparatus main body 10 alongside the cooling and condensing device 40, gasification from which tar and moisture have been removed by the cooling and condensing device 40. Tar and moisture remaining after being carried over by the gas can be collected by the eliminator 50 and dropped into the turbid liquid 16 below to be removed. At this time, the carried-over tar is covered with water vapor or water and travels down the outer surface of the eliminator corrugated plate 51 to be removed downward, so that the tar adheres to the outer surface of the corrugated plate 51 and deteriorates the function of the eliminator. Can be prevented.

Further, the cooling water supplied from the water supply device 71 is supplied to the inlet 42 of the cooling / condensing coil 41 of the cooling / condensing device 40, and a part of the steam flowing out of the outlet 43 of the cooling / condensing coil 41 is supplied to the cooling coil 21 of the cooling device 20. The superheated steam supplied to the inlet 22 and the other portion is supplied to the inlet 32 of the water vapor spraying unit 31 of the water spraying device 30, and the superheated steam flowing out of the outlet 23 of the cooling coil 21 is supplied to the superheated steam utilization device 75. The steam sprayed to the gasified gas at a medium temperature by the water spraying device 30 can be efficiently generated with a simple configuration and the superheated steam obtained at the time of cooling the gasified gas is efficiently used by the superheated steam utilization device 75. be able to.

In the first embodiment, the water spraying device 30 uses another portion that is a part of the steam flowing out of the cooling and condensing coil 41. Water vapor may be supplied to the inlet 32 of the water vapor spray unit 31 of the water spray device 30.

4. Configuration of Second Embodiment As shown in FIG. 3, the second embodiment is different from the first embodiment only in that the water spraying device 35 sprays not water vapor but spray water onto the gasified gas cooled to a medium temperature by the cooling device 20. Are different from the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only different parts will be described.

The water spray device 35 includes a high-pressure water supply device 36, a spray water spray portion 37, and a pipe 39 connecting the high-pressure water supply device 36 to an inlet 38 of the spray water spray portion 37. The spray water spraying section 37 is provided in the passage 11 of the apparatus main body 10 at the outlet 13 side along with the cooling device 20 so that the gasified gas cooled to the medium temperature by the cooling device 20 passes therethrough. There is no gap between the outer circumferential surface of the spray water spraying section 37 in the gas flow direction 18 and the inner circumferential surface of the passage 11, and all the gasified gas that has passed through the cooling device 20 passes through the spray water spraying section 37. . The spray water spraying section 37 is connected to a high-pressure water supply device 36, and is supplied with high-pressure water from an inlet 38. The high-pressure water is sprayed by a spray nozzle, sprayed onto a medium-temperature gasified gas, and steam is applied to the gasified gas. To make it rich in water vapor. The water spraying device 35 sprays the spray water from the spray water spraying part 37 almost uniformly in the horizontal direction from the downstream side toward the middle-temperature gasified gas flowing downstream in the passage 11 through the cooling device 20. . In addition, the water spraying device 35 may spray the sprayed water from the sprayed water spraying unit 37 almost uniformly in the horizontal direction from the upstream side to the middle-temperature gasified gas flowing in the passage 11 in the downstream direction.

The medium-temperature gasified gas that has passed through the cooling device 20 is sprayed with spray water by a water spraying device 35, is slightly cooled, and becomes a steam-rich gasified gas containing a large amount of water vapor. Flow. The second embodiment is the same as the first embodiment except that the water spray device 30 is replaced with a water spray device 35.

5. Effects of the Second Embodiment According to the second embodiment, not the soft treated water but, for example, ordinary tap water can be used as the spray water to be sprayed on the gasified gas at a medium temperature by the water spraying device 35. Therefore, it is economically advantageous.

6. Configuration of Third Embodiment The third embodiment is different from the first embodiment in that a vertical, not horizontal, tubular passage 81 is formed in the apparatus main body 80 as shown in FIG. The following description will focus on the differences, and the same components as those in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 4, the gasification gas cooling and tar removing device 8 according to the third embodiment includes a device main body 80, a cooling device 20 for cooling a high temperature gasified gas to a medium temperature, and a gas cooled to a medium temperature. A water spraying device 30 for containing water vapor in the gasification gas, cooling the gasification gas containing water vapor to a low temperature, condensing tar and water vapor, and falling into the turbid liquid 16 of tar and water stored in the storage unit 14 The cooling condensing device 45, the eliminator 50 that collects tar and water remaining after being carried over by the gasified gas that has passed through the cooling condensing device 45, and the liquid surface 17 of the turbid liquid 16 stored in the storage unit 14 is positioned at a predetermined position. And a gas cooling / cooling heat recovery circuit 70 for cooling the gasified gas and recovering the cooling heat.

The device main body 80 is a housing in which a vertically long passage 81 is formed and the outer periphery is covered with a heat insulating material. At an upper end surface of the passage 81, an inflow port 82 through which a high-temperature gasified gas flows from the gasification furnace 2 is formed. In the apparatus main body 80, a horizontal tubular outlet-side passage 84 is formed by bending a lower end portion of a vertical tubular passage 81. An outlet 83 is formed at an end surface of the outlet side passage 84 of the apparatus main body 80. The passage 81 guides the gasified gas flowing from the inlet 82 to flow toward the outlet 83 in the gas flowing direction 88. A concave storage portion 14 for storing the turbid liquid 16 containing condensed water and tar is formed on both the lower end surface of the passage 81 which is the lower plate of the apparatus main body 80 and the bottom surface of the outlet side passage 84. Have been. A drain hole 15 for discharging the turbid liquid 16 is formed in a lower portion of the storage unit 14. The bottom surface of the storage part 14 is inclined so that the drain hole 15 is at a low position.

Since the cooling device 20, the water spray device 30, the cooling / condensing device 45, the eliminator 50, the liquid level holding device 60, and the gas cooling / cooling heat recovery circuit 70 have the same configuration and function as those of the first embodiment, Differences from the first embodiment will be described below. The cooling device 20, the water spraying device 30, and the cooling / condensing device 45 are provided in a vertical cylindrical passage 81 in the same manner as in the first embodiment.

The water spraying device 30 is configured to spray the steam at the spraying temperature toward the middle-temperature gasified gas flowing in the downstream direction through the passage 81 in the downstream direction through the cooling device 20 so as to be substantially vertically upward from the downstream side. Spray from. Note that the water spraying device 30 may also spray the steam at the spraying temperature from the steam spraying unit 31 almost vertically downward from the upstream side to the medium-temperature gasified gas flowing in the passage 11 in the downstream direction. Good. The cooling / condensing device 45 is disposed above the storage unit 16 and has no gap between the inner peripheral surface of the vertical cylindrical passage 81 and the outer peripheral surface of the cooling / condensing device 45 in the gas flow direction 88, All the gasified gas that has passed through the attachment device 30 passes through the cooling and condensing device 45. Therefore, unlike the first embodiment, the lower end surface of the cooling / condensing device 45 is not positioned below the liquid surface 17 of the turbid liquid 16. The inlet 47 of the cooling condensing coil 46 of the cooling condensing device 45 is connected to a water supply device 71 via a pipe 72, and the outlet 48 is connected to the inlet 32 of the water spraying device 30 via a pipe 73. The inlet 22 is connected via a pipe 74.

The eliminator 50 is provided in the outlet side passage 84 of the apparatus main body 80 above the storage part 16 and on the side of the outlet 83 so that the gasified gas that has passed through the cooling and condensing device 45 passes therethrough. The lower end surface of the eliminator 50 is located below the liquid surface 17 of the turbid liquid 16 stored in the storage unit 14. As a result, there is no gap between the inner peripheral surface of the area defined by the inner peripheral surface except the lower surface of the outlet side passage 84 and the liquid surface 17 and the outer peripheral surface of the eliminator 50 in the gas flow direction. All the gasified gas that has passed through the device 45 passes through the eliminator 50.

In the third embodiment, the eliminator 50 is provided downstream of the cooling and condensing device 45. However, when the eliminator 50 is unnecessary, the eliminator 50 and the outlet side passage 84 are connected similarly to the first embodiment. No need to provide. In this case, an outlet 83 is provided on the lower end side surface of the vertical cylindrical passage 81, and the storage portion 14 is recessed on the bottom surface of the passage 81.

In the third embodiment, the water spraying device 30 utilizes another portion that is a part of the steam flowing out of the cooling and condensing coil 46. However, as in the first embodiment, the water spraying device 30 is inexpensive. When water vapor can be used, this water vapor may be used in the water spraying device 30.

As in the case of the first embodiment, the liquid level holding device 60 divides the atmosphere chamber 65 into the storage section 14 around the drain hole 15 as shown in FIG. The lower end of the partition wall 66 is slightly separated from the bottom surface of the storage unit 14, and the cylinder 67 having a height lower than the liquid level 17 by the difference H is surrounded by the drain hole 15 in the atmosphere chamber 65 and is formed on the bottom surface of the storage unit 14. It may be configured to stand upright.

7. Effects of Third Embodiment According to the third embodiment, the same effects as in the first embodiment can be obtained. Further, since the passage 80 has a vertical cylindrical shape, the installation area of the gasification gas cooling and tar removing device 8 can be reduced.

1,8: gasification gas cooling and tar removal device, # 2: gasification furnace, # 10, 80: apparatus main body, 11, 81: passage, # 12, 82: inlet, # 13, 83: outlet, # 14: storage unit , # 15: drain hole, # 16: turbid liquid, # 17: liquid level, # 18, 88: gas flow direction, # 20: cooling device, # 21: cooling coil, # 22: inlet, # 23: outlet, # 30, 35: water spray device , # 31: steam spray section, # 32, 38: inlet, # 36: high-pressure water supply apparatus, # 37: spray water spray section, # 40, 45: cooling condenser, # 41, 46: cooling condenser coil, # 42, 47: inlet # 43, 48: outlet, # 50: eliminator, # 60: liquid level holding device, # 70: gas cooling / cooling heat recovery circuit, # 71: water supply device, # 75: superheated steam utilization device, # 84: outlet side passage

Claims

A gasification gas cooling and tar removal device for cooling gasification gas and removing tar contained in the gasification gas,
An inlet through which the high-temperature gasified gas flows from the gasification furnace, an outlet through which the gasified gas cooled to a low temperature and from which tar has been removed flows out, and flows from the inlet toward the outlet. A horizontal cylindrical passage for guiding the gasified gas to be formed, and a concave formed on the bottom surface on the outlet side of the passage for storing the condensed water and the turbid liquid of tar, and discharging the turbid liquid to the lower portion A device body provided with a storage portion having a drain hole formed therein,
A cooling device that is provided on the inlet side in the passage of the apparatus main body so that the high-temperature gasified gas flowing from the inlet passes therethrough, and cools the high-temperature gasified gas to a medium temperature;
The gasification is provided at the outlet side along with the cooling device in the passage of the device main body so that the gasified gas cooled to the medium temperature by the cooling device passes therethrough, and the gasification cooled to the medium temperature is provided. A water spraying device for spraying steam or spray water on a gas to contain steam in the gasified gas cooled to the intermediate temperature,
As the gasified gas that has passed through the water spray device passes therethrough, along with the water spray device in the passage of the device main body, and is provided on the outlet side, and the lower end surface is in the storage portion. It is located below the liquid level of the stored turbid liquid, cools the gasified gas containing water vapor to a low temperature by the water spraying device, and condenses the tar and water vapor contained in the gasified gas. A cooling and condensing device for dropping and removing the turbid liquid stored in the storage unit,
A liquid level holding device that holds the liquid level of the turbid liquid stored in the storage unit at a predetermined position,
The cooling water supplied from the water supply device is supplied to the inlet of the cooling condensing coil of the cooling condensing device, and the steam flowing out from the outlet of the cooling condensing coil is supplied to the inlet of the cooling coil of the cooling device. A gas cooling / cooling heat recovery circuit for supplying superheated steam flowing out of the outlet to a superheated steam utilization device,
A gasification gas cooling and tar removal device comprising a.
As the gasified gas that has passed through the cooling / condensing device passes therethrough, along with the cooling / condensing device in the passage of the device main body, and is provided on the outlet side, and a lower end surface is stored in the storage portion. The tar and water remaining after being carried over by the gasification gas from which the tar and water vapor have been removed by the cooling and condensing device are located below the liquid level of the turbid liquid and collected in the storage unit. The gasification gas cooling and tar removing apparatus according to claim 1, further comprising an eliminator that drops the turbid liquid into the turbid liquid.
A gasification gas cooling and tar removal device for cooling gasification gas and removing tar contained in the gasification gas,
An inlet through which the high-temperature gasified gas flows from the gasification furnace, an outlet through which the gasified gas cooled to a low temperature and from which tar has been removed flows out, and flows from the inlet toward the outlet. A vertical cylindrical passage for guiding the gasified gas, and a concave formed on the bottom surface on the outlet side of the passage for storing the condensed water and tar turbid liquid, and discharging the turbid liquid to the lower part. A device body provided with a storage portion having a drain hole formed therein,
A cooling device that is provided on the inlet side in the passage of the apparatus main body so that the high-temperature gasified gas flowing from the inlet passes therethrough, and cools the high-temperature gasified gas to a medium temperature;
The gasification is provided at the outlet side along with the cooling device in the passage of the device main body so that the gasified gas cooled to the medium temperature by the cooling device passes therethrough, and the gasification cooled to the medium temperature is provided. A water spraying device for spraying steam or spray water on a gas to contain steam in the gasified gas cooled to the intermediate temperature,
As the gasified gas that has passed through the water spray device passes therethrough, it is provided in the passage of the device body along with the water spray device on the outflow port side, and the water spray device converts the water vapor. A cooling and condensing device for cooling the contained gasified gas to a low temperature, condensing the tar and water vapor contained in the gasified gas, and dropping the tar and water vapor into the storage unit to remove the same.
A liquid level holding device that holds the liquid level of the turbid liquid stored in the storage unit at a predetermined position,
The cooling water supplied from the water supply device is supplied to the inlet of the cooling condensing coil of the cooling condensing device, and the steam flowing out from the outlet of the cooling condensing coil is supplied to the inlet of the cooling coil of the cooling device. A gas cooling / cooling heat recovery circuit for supplying superheated steam flowing out of the outlet to a superheated steam utilization device,
A gasification gas cooling and tar removal device comprising a.
The lower end of the outlet side of the vertical cylindrical passage is bent to form a horizontal cylindrical outlet side passage in the apparatus main body, the outlet is provided in the apparatus main body, and the outlet side passage of the outlet side passage is formed. Formed at the end,
A liquid of the turbid liquid is provided in the outlet side passage upstream of the outlet so that the gasified gas that has passed through the cooling condenser passes therethrough, and a lower end surface of the turbid liquid is stored in the storage part. Surface, and the tar and water remaining after being carried over by the gasification gas from which the tar and the water vapor have been removed by the cooling and condensing device are collected and the turbid liquid stored in the storage unit is collected. 4. The gasification gas cooling and tar removing device according to claim 3, further comprising an eliminator that drops the gas.