JP3848949B2 - Dust remover, organic fuel gasification system, and liquid fuel synthesis system - Google Patents

Description

  The present invention provides a dust removing device capable of removing dust contained in the gas from various gasifiers and dust-containing gas discharged from a combustion device at low cost and high efficiency, and an organic system equipped with the dust removing device. The present invention relates to a fuel gasification system and a liquid fuel synthesis system.

  Various combustors and gasifiers using flammable materials such as petroleum and coal, waste, biomass, etc. have been developed. However, it contains a fine dust-like dust component. Whether these gases are used as a fuel gas or a raw material gas for alcohol synthesis or when they are treated as exhaust gas, it is necessary to carry out the removal process of the dust in the gas with high accuracy.

  As the above-described gas dust removing device, a device using a water jet water droplet jet as a removal medium has been known (Patent Document 1), and various improvements have been proposed depending on the processing target. Among them, a representative example is shown in FIG.

  The dust removing device using the water jet water droplet jet sucks the gas 101 that requires dust removal processing to form a water jet water droplet jet 102 in the vertical axis direction, and communicates with the drive nozzle 103. The water jet water droplet jet 102 and the gas 101 are received by covering the water jet water droplet jet 102 released from the gas 103, and dust particles in the gas are attached to the water droplets to remove dust from the gas 101. A cylindrical scrubber unit 104 for performing the above-described operation, and an outlet for storing the water jet water droplet jet water as circulating water and sending the gas 101 from which the fine particle component and the water-soluble component are separated in the scrubber unit 104 to the next processing step A circulating water tank 105 having 105a, and a stirring means 1 for stirring the stored water in the circulating water tank 105 6, a discharge pipe 108 disposed at the lower end of the side of the circulating water tank 105, forcibly discharging the circulating water in the circulating water tank 105 by the circulation pump 107, and a strainer 109 interposed in the discharge pipe 108, It is an apparatus which comprises.

  The scrubber portion 104 is an integrally structured tubular member, and has a chamber portion 104a having a relatively large diameter, followed by a funnel-shaped suction portion 104b, a reduced diameter straight tubular throat portion 104c, and a diffuser that gradually increases in diameter. It is comprised from the part 104d and the wide expansion straight pipe | tube exit pipe | tube part 104e. The drive nozzle 103 is disposed in the center of the chamber portion 104 a, and the jet nozzle of the drive nozzle 103 is located at the center line of the scrubber portion 104. An inlet 104f for the gas 101 is formed on the side of the chamber portion 104a, and the gas 101 is set to be entrained in the water jet water droplet jet 102. The water jet water droplet jet 102 and the gas 101 merge at the suction portion 104b, and gas-liquid mixing is performed at a high flow velocity in the reduced diameter straight tubular throat portion 104c, thereby promoting adhesion and coalescence of dust particles to the water droplets. Thereafter, the water droplet jet is guided to the diffuser portion 104d, which gradually expands in diameter, and the flow velocity decreases, and the high flow velocity energy is changed to pressure energy to reduce the pressure loss of the scrubber. The water droplet flow in which the fine particle component and the water-soluble component are absorbed from the gas 101 flows into the circulating water tank 105 at a low speed from the outlet pipe portion 104e having a widened straight tube, and the gas 101 washed with water is supplied to the circulating water tank 105. The gas is discharged from the gas discharge port 105a to the next processing step via the upper space.

  Dust and tar components separated from the gas 101 by the water jet water droplet jet 102 and adhering to the water droplets are temporarily submerged in the water by dropping together with the water droplets in the circulating water tank 105, but they are hydrophobic and lightweight. Because there is, it rises to the surface of the water immediately. Even when the water droplet jet water continues to flow strongly, the fine particle component cannot be uniformly distributed in the circulating liquid. Therefore, even if the circulating fluid is sucked from the discharge pipe disposed below the circulating water tank 15, the floating fine particle component can hardly be recovered. Therefore, in this apparatus, a stirring means 106 that stirs the water in the circulating water tank 105 is provided. By driving the stirring means 106, the water staying in the water is prolonged by the water flowing down vigorously as described above, and the circulation pump 107 is connected to the water through the discharge pipe 108 together with the circulating water. And then separated and recovered by the strainer 109. The water from which the fine component has been separated by the strainer 109 is sent from the circulation pump 107 to the drive nozzle 103 by the circulation line 110.

  The circulation line 110 is provided with a heat exchange type cooler 111 and an on-off valve 112 and a flow meter 113. Further, a bypass pipe 114 is connected to the downstream side of the cooler 111 in the circulation line 110 so as to send a part of the circulating water directly into the circulating water tank 105. An open / close valve 115 and a flow meter 116 are also attached to the bypass pipe 114.

Japanese Patent Laid-Open No. 10-63644

  The conventional dust removing device can remove water-soluble substances in gas and condensable dust such as tar by contact with a water jet water droplet jet, but the hydrophobic low-density gravity fine particles generated by the condensation are trapped water. Therefore, it becomes difficult to efficiently introduce the water from the circulating water tank 105 to the strainer 109. For this reason, the dust removing apparatus is provided with the agitation means 106, but the hydrophobic and low specific gravity fine particle component cannot be efficiently guided to the discharge pipe 108. The floating fine particle component in the circulation tank 105 is unevenly distributed on the water surface and always remains, which is a bottleneck in removing efficiency. Furthermore, with time, a part of the floating fine particle component becomes a deposit and deposits on the bottom of the circulation tank 105. Accumulation of floating components and deposits derived from these fine particle components may cause clogging in the circulation system of the dust remover, and regular open cleaning is required.

  In addition, the water after the gas cleaning stored in the circulation tank 105 contains fine dust that cannot be collected by the strainer 109, and the amount exceeds the drainage regulation value. There is.

  Further, the water level in the circulation tank 105 is adjusted by the bypass pipe 114, but the adjustment is not sufficient and the water level is likely to be unstable. In some cases, the water level is too low, and the circulation pump 107 is Air can be caught, causing problems.

  The water after gas cleaning may contain cyan recovered from the gas 101, and the amount may slightly exceed the drainage regulation value.

  Further, there is a problem that the capacity of the circulation tank 105 is large with respect to the processing amount of the floating fine particle component, and the performance of (capacity) vs. (fine particle component processing amount) is low.

  Furthermore, depending on the gas to be processed, heavy metals may be contained, and efficient recovery of the heavy metals is also a problem.

  The present invention has been made in view of the above-described conventional circumstances, and can solve the above-described conventional problems and efficiently separate cyanide and even heavy metals including fine particles in dust-containing gas. Another object of the present invention is to provide a dust removing device that can save space, an organic fuel gasification system using the dust removing device, and a liquid fuel synthesizing system using organic fuel biomass.

The dust removing device of the invention of [Claim 1] that solves the above-described problem is a drive nozzle that sucks dust-containing gas to form a water jet water droplet jet in the vertical axis direction, and communicates with the drive nozzle. The water jet water droplet jet and dust-containing gas are mixed so as to cover the jet water droplet jet discharged from the scrubber portion for removing dust-containing gas, and the water jet water droplet flowing down from the scrubber portion The jet water is received at the upper surface opening and temporarily stored as circulating water , and the pipe diameter is smaller than the opening diameter of the upper surface opening, and the suction pipe communicates with the suction pipe and has a certain level of water inside. a level tank for storing, detecting the water level of the level in the tank the inlet to open and close, and a level detection control means for adjusting the level of the suction tube at the same level, is disposed in the suction pipe, the A discharge pipe for forcibly ejected by a circulation pump circulating water in 引管, characterized in that the forced discharge water from the suction pipe is provided with a circulation line for circulating the driving nozzle.
Further, the invention of [Claim 2] is that in Claim 1, the level detection control means has an amount of water discharged to the circulation line equal to or greater than the amount of water flowing from the scrubber portion into the suction pipe. It is characterized by that.

[Claim 3 ] The invention of [Claim 3 ] is characterized in that, in claim 1 or 2 , an annular shower means is provided along an inner edge of the upper opening of the suction pipe.

[Claim 4 ] The invention of [Claim 4 ] is characterized in that, in Claim 3 , a bypass pipe provided in the circulation line is connected to the annular shower means, and the circulating water is reused as shower water. .

[Claim 5 ] The invention according to [Claim 5 ] is that in any one of claims 1 to 4, a liquid reservoir tank is provided on the outer periphery of the suction pipe so as to accommodate the suction pipe therein. The replenished water is supplied to the level tank.

[Claim 6 ] The invention according to [Claim 6 ] is that, in any one of claims 1 to 4 , a level tank is provided on an outer periphery of the suction pipe so as to accommodate the suction pipe therein, and is provided at a side portion of the suction pipe. The level tank and the suction pipe communicate with each other by forming an opening.

[Claim 7 ] The branch drainage pipe according to any one of claims 1 to 6 , wherein a part of the circulating water discharged from the suction pipe by the circulation pump flows to a wastewater treatment step outside the system. Is provided in the circulation line.

The invention of [ 8 ] is characterized in that, in any one of claims 1 to 7 , a drug injection means is provided in the level tank and / or the suction pipe.

The invention of [ 9 ] is characterized in that, in any one of claims 1 to 8 , an auto strainer is interposed in the circulation line downstream of the circulation pump.

The invention of [ 10 ] is characterized in that, in any one of claims 1 to 9 , the dust-containing gas is a gas generated by a gasification furnace of an organic fuel.

The invention of [Claim 1 1 ] is characterized in that in any one of Claims 1 to 10 , the dust-containing gas contains cyan.

Invention [Claim 1 2], in any one of claims 1 to 1 1, characterized in that the dust-containing gas contains heavy metals.

Invention [Claim 1 3] is a gasification system of organic fuel comprising the dust removing system according to any one of claims 1 1 2.

Invention [Claim 1 4] is a liquid fuel synthesizing system using an organic fuel comprising the dust removing system according to any one of claims 1 1 2.

  As described above, in the present invention, the water jet water droplet jet and the gas are efficiently gas-liquid mixed to dissolve and remove the water-soluble components in the gas in the water phase, and the hydrophobic components such as tar are cooled with water. It can be condensed and floated and separated into the aqueous phase as a fine particle component, and substances such as heavy metals and cyan that cannot be discharged to the environment can be changed to a separable state by a simple process such as coagulation sedimentation by a jet scrubber mechanism. The finely separated particulate components are efficiently collected together with water in a suction tube that can reliably maintain the water level with a small volume, and separated by a strainer or separated by a wastewater treatment device outside the system. The heavy metal and cyan form a complex, aggregate and precipitate, and are separated. Therefore, according to the dust removing device of the present invention, dust can be removed with high accuracy, and the gas discharged from the gasifier or the combustion device can be purified into a clean gas. Particularly when applied to gasification systems for organic fuels such as biomass and methanol synthesis systems using organic fuels, the purity of the gas is high, so useful fuel gases and methanol can be produced in high yields. It can be manufactured.

  Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

(First embodiment)
FIG. 1 is an overall configuration diagram showing a first embodiment of a dust removing apparatus according to the present invention.
The dust removing device using this water jet water droplet jet includes, for example, a drive nozzle 3 that sucks dust-containing gas 1 such as gas generated in a biomass gasification furnace to form a water jet water droplet jet 2 in the vertical axis direction, and communicates with the drive nozzle 3, mixed gas-liquid and the water jet water droplet jet 2 and the dust-containing gas 1 by receiving so as to cover the water jet water drop jet 2 released from the drive nozzle 3, the dust containing gas 1 A cylindrical scrubber portion 4 that performs dust removal, a suction pipe 5 that receives water jet water droplets flowing down from the scrubber portion 4 and temporarily stores it as circulating water, and communicates with the suction pipe 5 and is constant inside. A level tank 6 that stores water of a level, a discharge pipe 8 that is disposed in the suction pipe 5, forcibly discharges circulating water in the suction pipe 5 by a circulation pump 7, and is forcibly discharged from the suction pipe 5. In front of water A device for and a circulation line 9 for circulating the driving nozzle 3.

  The scrubber portion 4 is a cylindrical member having an integral structure, and includes a chamber portion 4a having a relatively large diameter, a funnel-like suction portion 4b, and a diffuser portion 4c that gradually increases in diameter. Yes. The drive nozzle 3 is arranged in the center of the chamber portion 4 a, and the jet nozzle of the drive nozzle 3 is located at the center line of the scrubber portion 4. An inlet 4d for the dust-containing gas 1 is formed in the side portion of the chamber portion 4a, and is set so as to entrain the dust-containing gas in the water jet water droplet jet 2. The water jet water droplet jet 2 and the dust-containing gas 1 merge at the suction portion 4b, and are then mixed at a high flow velocity at the subsequent diffuser portion 4c to promote adhesion and coalescence of dust particles to the water droplets. The flow velocity decreases due to the widening of the diameter, and the high flow energy is changed to pressure energy to reduce the pressure loss of the scrubber. The water droplet stream that has absorbed the fine particle component and the water-soluble component flows down toward the suction pipe 5, and the gas washed with water passes through the upper space of the suction pipe 5 to the next step from the gas discharge port 5 a. It is discharged towards.

  The upper opening 10 of the suction tube 5 is enlarged in diameter with respect to the lower main body portion of the suction tube 5, and the inner diameter of the enlarged opening 10 is the cylindrical scrubber located above the opening 10. The inner diameter of the lower end opening of the diffuser part 4c of the part 4 is set somewhat larger. And the upper opening part 10 of the suction pipe 5 and the lower end opening part of the diffuser part 4c of the scrubber part 4 flow down and are integrally connected so that the scattered jet water does not leak to the outside.

  An annular cleaning nozzle (shower means) 11 is provided along the inner edge of the upper opening 10 of the suction pipe 5. As shown in FIG. 2, the annular cleaning nozzle 11 has a pipe formed in an annular shape and a plurality of nozzle holes 11 a formed in the lower portion thereof, and the entire peripheral surface of the upper inner wall surface of the suction pipe 5. The shower water can be sprayed evenly. A bypass pipe 12 provided in the circulation line 9 is connected to the annular cleaning nozzle 11, and the circulating water is sprayed onto the inner wall surface of the upper opening 10 of the suction pipe 5 as cleaning shower water. In the jet water flowing down from the scrubber portion 4, a large amount of hydrophobic fine particle components lighter than water are generated, and after entering the suction pipe 5, they float on the water surface and adhere to the upper inner wall surface of the suction pipe 5. It is easy and it is difficult to knock it down by running water. Thus, even if the floating fine particle component adheres to the inner wall surface of the upper part of the suction pipe 5, it is efficiently washed off by the annular washing nozzle 11, so that it can be easily circulated by the circulation pump 7 from the discharge pipe 8 provided at the lower part. Can be sucked into the line.

  A communication pipe 13 connected to the level tank 6 is connected to the lower part of the suction pipe 5, and an external makeup water inlet 14 is provided in the middle of the level tank 6. The level detection means 14a which detects the water level in the level tank 6 and opens and closes the inlet 14 is attached. This level detection means 14 may be controlled by a known ball tap method or may be controlled by an electromagnetic valve. With the level tank 6 having such a configuration, the water level in the suction pipe 5 can always be easily maintained at a constant level. The upper end of the level tank 6 is opened to the atmospheric pressure through the lid 15, and the upper part of the tank 6 and the upper part of the suction pipe 5 are vented by the pressure equalization line 16. The water level in the suction pipe 5 and the water level in the suction pipe 5 are easily adjusted to the same level. In order for the level adjustment in the suction pipe 5 by the level tank 6 to be executed smoothly, the amount of water discharged to the circulation line 9 by the circulation pump 7 with respect to the amount of water flowing into the suction pipe 5 from the scrubber unit 4 is reduced. Must be equal or better.

As described above, in order to maintain the water level in the suction pipe 5 at a predetermined level by the level tank 6, it is necessary to appropriately control the flow rate of the water jet water droplet jet 2 and the discharge amount by the circulation pump 7.
The water level in the suction pipe 5 may be higher than the opening face so as not to suck air from the opening face of the discharge pipe 8, and may be lower than the cleaning nozzle 11 of the suction pipe 5.

Before the floating dust submerged deep below the surface of the suction pipe 5 by the downward jet water from the scrubber section 4 and the cleaning shower water from the cleaning nozzle 11, the water in the suction pipe 5 is recirculated to the circulation pump 7. If it is not sucked in, the floating dust will remain in the suction pipe 5 indefinitely. Therefore, the suction amount by the circulation pump 7 needs to be adjusted to a value in which the circulating water discharge speed is higher than the dust floating speed. . This value can be adjusted by the circulation flow rate and the inner diameter of the main body of the suction pipe 5. In the present invention, the suction tube 5 differs with conventional circulation tank, since the small-capacity in the tubular, and water quantity in the suction pipe 5 is low relative to the discharge rate of the circulation pump 7, the suction tube The residence time of the water in 5 can be made into about 10 second, and the discharge | emission of a floating fine particle component is attained more efficiently.

  In the present embodiment, an auto strainer 17 is installed downstream of the circulation pump 7, and the circulating water discharged from the suction pipe 5 by the circulation pump 7 is sucked into the auto strainer 17, where it floats in the circulating water. Dust is removed and recovered, and the circulating water is cooled by the heat exchanger 18 and sent to the drive nozzle 3. A branch drain pipe 18 is connected downstream of the strainer 17 so that a part of the circulating water is sent to a waste water treatment process outside the system.

Since the dust removing device using the water jet water droplet jet can sufficiently gas-liquid mix the dust-containing gas and a large amount of water droplets, it easily captures particulate components of 3 μm or less, and turns dust or tar particles into water droplets. It can be attached and united. For the same reason, it becomes possible to separate water-soluble impurities such as tar, NH ₃ , HCN, Na, K, Cl into an aqueous phase.

  Since the raw gas is cooled by the water jet water droplet jet water, it is possible to condense and separate volatile components such as gaseous tar in the gas. By using the jet water droplet jet water in a circulating manner, impurities trapped in the water phase can be concentrated and separation becomes easy. This tar component can be recovered by the strainer 17 for obtaining circulating water, and this tar component can be reused as a chemical raw material such as fuel and insecticide.

  In the dust removing apparatus using the water jet water droplet jet according to the present invention, since it acts so that the untreated gas is entrained in the water jet water droplet jet injected into the scrubber portion 4 which is a cylindrical space, not only pressure loss does not occur. On the contrary, pressure is applied to the subsequent gas flow with some pressure, which can contribute to the efficiency of the entire gas purification line.

  The pressure equalization line 16 is provided with an on-off valve 16a. By closing the on-off valve 16a and opening the lid 15, dirt in the level tank 6 can be removed during operation. is there.

(Second Embodiment)
FIG. 3 shows a second embodiment of the present invention. The same components as those shown in FIG.

  A feature of the present embodiment is that a liquid reservoir tank 20 is provided on the outer periphery of the suction pipe 5 so as to accommodate the suction pipe 5 therein, and water supplied to the liquid reservoir tank 20 is supplied to the level tank 6. It is in the structure which has come to be done. With this configuration, the upper part of the liquid storage tank 20 and the lower end of the scrubber part 4 are integrally connected, and the upper opening 10 of the suction pipe 5 is located below the diffuser part 4c of the scrubber part 4 in a disconnected manner. It opens into the liquid reservoir tank 20. Further, the gas discharge port 20 a is provided in the upper part of the liquid storage tank 20. Further, the makeup water inlet 14 of the level tank 6 is connected to the liquid tank 20, and the pressure equalization line 16 of the level tank 6 is also connected to the upper part of the liquid tank 20. Control of the amount of makeup water injected into the liquid storage tank 20 may be performed by a ball tap method, an electromagnetic valve, or another known method. The water level of the liquid storage tank 20 is maintained at a level higher than the control water levels of the suction pipe 5 and the level tank 6 by the control means.

The dust removal apparatus of the present embodiment basically has the same functions and effects as the dust removal apparatus of the first embodiment, but there are also the functions and effects unique to the present embodiment, and they are as follows.
(I) By treating the suction pipe 5 as an inner tank and allowing the liquid reservoir tank 20 to function as an outer tank, even when the water level of the suction pipe 5 drops rapidly, the liquid reservoir tank 20 as an outer tank is temporarily In this way, the suction pipe 5 can be immediately supplied with water.
(Ii) A large amount of water is filled in the outer periphery of the suction pipe 5, and a sudden change in the circulating water temperature can be prevented.

(Third embodiment)
FIG. 4 shows a third embodiment of the present invention, and the same components as those shown in FIG. 1 and FIG.

  The feature of this embodiment is that the level tank 30 is provided on the outer periphery of the suction pipe 5 so as to accommodate the suction pipe 5 therein, and the communication pipe 31 is connected to the side portion of the suction pipe 5. The level tank 30 and the suction pipe 5 are in communication with each other. The communication pipe 31 has a certain length so that a rapid backflow does not occur. With this configuration, the upper part of the level tank 30 and the lower end of the scrubber part 4 are integrally connected, and the upper opening 10 of the suction pipe 5 is located below the diffuser part 4c of the scrubber part 4 in a disconnected manner. And is open in the level tank 30. Further, the gas discharge port 30 a is provided in the upper part of the level tank 30. A replenishment water inlet 32 is provided in the side wall of the level tank 30, and a level detector 32a having the same mechanism as the level detector 14a is attached to the inlet.

The dust removal apparatus of the present embodiment basically has the same functions and effects as the dust removal apparatus of the first embodiment, but also has the functions and effects unique to the present embodiment, and they are as follows.
(I) By handling the suction pipe 5 as an inner tank and arranging the level tank 30 as an outer tank, it is possible to save the space of the entire apparatus as compared with the adjacent arrangement.
(Ii) A water wall is formed on the outer periphery of the suction pipe 5, and a sudden change in the circulating water temperature can be prevented.

(Fourth embodiment)
FIG. 5 shows a fourth embodiment of the present invention, and the same components as those shown in FIG.

  The feature of this embodiment is that the auto strainer 17 is omitted in the configuration shown in FIG. This embodiment is an embodiment dependent on the fact that the waste water treatment device provided at the end of the branch drain pipe 18 provided in the circulation line 9 is a device capable of maintaining a sufficient treatment capacity and treatment quality. This embodiment is acceptable when used in combination with a wastewater treatment apparatus. In the present embodiment, the auto strainer 17 can be omitted, thereby saving the pump power and the auto strainer power, and the running cost of the apparatus can be greatly reduced.

(Fifth embodiment)
FIG. 6 shows the fifth embodiment of the present invention, and the same components as those shown in FIG.

The feature of this embodiment is that, in the configuration shown in FIG. 1, the cyan-containing product gas 41 is introduced as a processing gas as a dust-containing gas, and an acid supply means (chemical injection means) 42 is disposed above the level tank 6. It is in the established point. From the acid supply means 42, a strong acid such as sulfuric acid is added to the makeup water in the tank. By introducing the makeup water inclined to the acid into the suction pipe 5, the circulating water in the suction pipe 5 is made acidic or neutral. As it is, the circulating water contains ammonia derived from the dust-containing gas, and the circulating water is alkaline. Therefore, when cyan is contained in the dust-containing gas, at least a part thereof is dissolved in the circulating water and is sent to the waste water treatment apparatus while being contained in the waste water. Removal of cyanide in wastewater is not easy and it is expensive to remove it before it meets the wastewater standard. Thus, in the suction pipe 5, the cyan component from the dust-containing gas 41 is in the stage of dissolving in alkaline circulating water. In this embodiment, the circulating water is added by adding strong acid from the acid supply means 42. PH can be inclined to neutral or acidic, whereby the dissolution of cyanide in the circulating water can be suppressed. As a result, the amount of cyan dissolved in the wastewater sent from the branch drainage pipe 18 to the wastewater treatment apparatus outside the system can be reduced, and the wastewater treatment cost can be reduced. Cyan, which is prevented from being dissolved in the circulating water, is mixed in the exhaust gas, and is sent together with the exhaust gas to the gas processing apparatus outside the system through the gas discharge port 5a. Cyanide in the gas can be easily decomposed by burning the gas and can be treated at a much lower cost than if it is present in the waste water. In this process, it is desirable to control the temperature in the scrubber unit 4 to a high temperature within a range not exceeding 60 ° C. by a temperature control means (not shown). If the temperature in the scrubber part 4 exceeds 60 ° C., the ammonia in the circulating water is transferred to the gas phase and exhausted together with the exhaust gas. This is because the treatment of ammonia in the gas cannot be performed easily. By controlling to such a temperature range, it is possible to suppress only the dissolution of cyanide in the circulating water without suppressing the dissolution of other substances in the circulating water.
In this embodiment, the acid supply means is attached to the level tank as the medicine injection means. However, it can be directly attached to the suction pipe or can be attached to both the level tank and the suction pipe at the same time. Moreover, not only an acid is supplied as a chemical injection means, but an aggregating agent may be supplied as needed.

(Sixth embodiment)
FIG. 7 shows a sixth embodiment of the present invention. The same components as those shown in FIG.

  The feature of this embodiment resides in that, in the configuration shown in FIG. 1, a generated gas 51 containing cyan and heavy metal simultaneously as a dust-containing gas is introduced as a processing gas. Examples of such a dust-containing gas include a fuel gas made from biomass as a raw material, particularly a fuel gas made from biomass containing a waste material in which an anti-anticide is used. When such a dust-containing gas 51 is contact-mixed with the jet jet water 2 in the scrubber section 4 and cooled in the diffuser section 4c, the heavy metal in the dust-containing gas 51 is condensed and separated from the gas phase side. Move into the phase. The heavy metal thus moved into the circulating water is combined with cyan dissolved in the circulating water mainly in the suction pipe 5 to form a precipitate, which is sent to the auto strainer 17 by the circulation pump 7, where the precipitate is Removed from circulating water. By introducing the dust-containing gas containing cyan and heavy metal as the processing gas in this way, it becomes possible to remove heavy metal and cyan which are difficult to process by simple coagulation precipitation. Therefore, as the gas to be treated by the dust removing apparatus of the present invention, a dust-containing gas containing heavy metal and cyan at the same time is introduced, or a dust-containing gas rich in heavy metal and a dust-containing gas rich in cyan are mixed. If introduced, heavy metals and cyan can be simultaneously removed from the gas into the aqueous phase, and then both can be separated as precipitates from the wastewater by simple removal means, and further remain in the wastewater. The heavy metal cyanide can be removed to a high degree by introducing it into a precipitation tank outside the system, and then clean wastewater can be obtained.

(Seventh embodiment)
FIG. 8 shows an embodiment in which the above-described dust removing apparatus of the present invention is used in a methanol synthesis system using biomass, which is a typical example of organic fuel.

  Biomass generally refers to organisms that can be used as energy sources or industrial raw materials (for example, agricultural products or by-products, wood, plants, etc.), and are produced by the action of solar energy, air, water, soil, etc. So it can be played indefinitely.

By using the biomass, it is possible to produce a clean energy source such as fuel gas and methanol. Further, since biomass as waste can be treated, it is useful for environmental purification, and newly produced biomass is also grown by fixing CO ₂ by photosynthesis, so it does not increase CO ₂ in the atmosphere, so CO ₂ This is a preferable technique because it leads to suppression of the above.

  Biomass comprising biomass supply means 62 for supplying biomass 60 into the furnace body 61 and oxidant supply means 64 for supplying combustion oxidant 63 made of oxygen or a mixture of oxygen and water vapor into the furnace body 61. Separation means 67 such as a cyclone that removes dust in the gasification furnace 65, the dust-containing gas 66 gasified by the biomass gasification furnace 65, and dust having a relatively large particle diameter of 3 μm or more by the separation means 67 The dust removal apparatus 201 of the present invention for removing dust from the removed gas with higher accuracy, a gas purification device 68 for purifying the gas removed with high precision, and synthesizing methanol using the purified gas, A methanol synthesis system 73 includes a methanol synthesizer 72 equipped with a distillation device 71 that separates into 69 and methanol 70.

  As the biomass 60 to be supplied, it is preferable to supply pulverized and dried biomass produced or discarded. Biomass referred to in the present invention refers to biological resources that can be used as an energy source or industrial raw material (for example, agricultural products or by-products, wood, plants, etc.), for example, sweet sorghum, napiergrass, spirulina, etc. It has been.

  Since the gas generated from the biomass contains fine particles, tar components, hydrogen sulfide, chlorine, cyan, heavy metal compounds, etc., as it is, it can be used as a liquid fuel using a synthetic catalyst or as an energy source for fuel cells. Not suitable for gas for synthesis. Therefore, in the present invention, by using the dust removing device 201 using the water jet water droplet jet shown in the above first to sixth embodiments, trace components such as fine particles, tar components, hydrogen sulfide, and chlorine are efficiently removed. Has been removed. The mechanism of the removal is as described in the first to sixth embodiments. As a raw material gas for obtaining an energy source for a liquid fuel or a fuel cell, in actual operation, it is necessary to reduce the allowable content of the trace component to a detection limit amount. If the dust removal apparatus 201 is used and a high-precision adsorption purification apparatus is used in combination as necessary, the trace components that have been difficult to achieve can be sufficiently reduced. In addition, the system in the case of obtaining mainly clean product gas from biomass is realizable with the component to the gas purification apparatus 68 of FIG.

  As described above, the dust removing apparatus according to the present invention is connected to the drive nozzle that sucks dust-containing gas and forms a water jet water droplet jet in the vertical axis direction, and is discharged from the drive nozzle. By receiving the jet water droplet jet so as to cover it, the water jet water droplet jet and the dust-containing gas are gas-liquid mixed, and the scrubber portion for removing the dust-containing gas is received, and the water jet water droplet jet water flowing down from the scrubber portion is received. A suction pipe that temporarily stores as circulating water, a level tank that communicates with the suction pipe and stores a constant level of water therein, and is disposed in the suction pipe, and circulates the circulating water in the suction pipe. And a circulation line that circulates water forcedly discharged from the suction pipe to the driving nozzle.

  The organic fuel gasification system and the liquid fuel synthesizing system using the organic fuel according to the present invention are characterized by using the dust removing device.

  In the present invention, the water jet water droplet jet and the gas are efficiently gas-liquid mixed to dissolve and remove the water-soluble component in the gas in the water phase, and the hydrophobic component such as tar is cooled and condensed to form a fine particle component To float in the water phase. The finely separated particulate components are efficiently collected together with water in a suction tube that can reliably maintain the water level with a small volume, and separated by a strainer or separated by a wastewater treatment device outside the system. Therefore, according to the dust removing device of the present invention, dust can be removed with high accuracy, and the gas discharged from the gasifier or the combustion device can be purified into a clean gas. Especially when applied to gasification systems for organic fuels such as biomass and liquid fuel (methanol) synthesis systems using organic fuels, the purity of the gas is high. It becomes possible to manufacture with a high yield.

It is a whole lineblock diagram showing a 1st embodiment of a dust removal device using a water jet water droplet jet concerning the present invention. It is a perspective view of the cyclic | annular washing nozzle (annular shower means) of the suction tube which is the principal part of the dust removal apparatus of FIG. It is a whole block diagram which shows 2nd Embodiment of the dust removal apparatus using the water jet water droplet jet which concerns on this invention. It is a whole block diagram which shows 3rd Embodiment of the dust removal apparatus using the water jet water droplet jet which concerns on this invention. It is a whole block diagram which shows 4th Embodiment of the dust removal apparatus using the water jet water droplet jet which concerns on this invention. It is a whole block diagram which shows 5th Embodiment of the dust removal apparatus using the water jet water droplet jet which concerns on this invention. It is a whole block diagram which shows 6th Embodiment of the dust removal apparatus using the water jet water droplet jet which concerns on this invention. 1 is an overall configuration diagram of a “liquid fuel synthesizing system using organic fuel (biomass)” according to the present invention using the dust removing apparatus of the present invention. It is a block diagram which shows an example of the dust removal apparatus using the conventional water jet water droplet jet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust-containing gas 2 Water jet Water droplet jet 3 Drive nozzle 4 Scrubber part 4a Chamber part 4b Suction part 4c Diffuser part 4d Gas introduction port 5 Suction pipe 5a Gas discharge port 6 Level tank 7 Circulation pump 8 Discharge pipe 9 Circulation line 10 Suction pipe Upper opening 11 of the washing nozzle (shower means)
11a Nozzle hole 12 Bypass pipe 13 provided in the circulation line 14 Communication pipe 14 Replenishment water inlet 14a of the level tank Level detection means 15 of the level tank 15 Level tank lid 16 Pressure equalizing line 16a between the level tank and the suction pipe Open / close valve 17 Auto Strainer 18 Heat Exchanger 20 Liquid Reservoir Tank 20a Gas Discharge Port 30 Level Tank 30a Gas Discharge Port 31 Communication Pipe 32 Makeup Water Injection Port 32a Level Detection Means 41 Cyan-containing Product Gas (Dust-Containing Gas)
42 Acid supply means (medicine injection means)
51 Product gas containing both cyanide and heavy metal (dusty gas)
60 Biomass 61 Furnace Main Body 62 Biomass Supply Unit 63 Combustion Oxidant 64 Oxidant Supply Unit 65 Biomass Gasification Furnace 66 Generated Gas 67 Dust Separation Unit 68 Gas Purifier 69 Exhaust Gas 70 Methanol 71 Distillation Unit 72 Methanol Synthesis Unit 73 Methanol Synthesis System 201 Dust remover of the present invention

Claims (14)

A drive nozzle that sucks dust-containing gas and forms a water jet water droplet jet in the vertical axis direction;
A scrubber unit that communicates with the drive nozzle and gas-liquid mixes the water jet water droplet jet and the dust-containing gas by receiving the jet water droplet jet discharged from the drive nozzle so as to cover the dust; ,
The water jet water droplets flowing down from the scrubber part are received at the upper surface opening and temporarily stored as circulating water , and the pipe diameter is smaller than the opening diameter of the upper surface opening ,
A level tank that communicates with the suction pipe and stores a certain level of water therein;
Level detection control means for detecting the water level in the level tank, opening and closing the inlet, and adjusting the water level of the suction pipe to the same level;
A discharge pipe disposed in the suction pipe and forcibly discharging the circulating water in the suction pipe by a circulation pump;
And a circulation line for circulating water forcedly discharged from the suction pipe to the drive nozzle.   2. The dust removing apparatus according to claim 1, wherein the level detection control means has an amount of water discharged to the circulation line equal to or greater than an amount of water flowing down from the scrubber portion into the suction pipe. The dust removing device according to claim 1 or 2 , wherein an annular shower means is provided along an inner edge of the upper opening of the suction pipe. The dust removing device according to claim 3 , wherein a bypass pipe provided in the circulation line is connected to the annular shower means, and the circulating water is reused as shower water. 2. A liquid reservoir tank is provided on an outer periphery of the suction pipe so as to accommodate the suction pipe therein, and water supplied to the liquid reservoir tank is supplied to the level tank. 5. The dust removing device according to any one of items 1 to 4 . The level tank is provided on the outer periphery of the suction pipe so that the suction pipe is accommodated therein, and an opening is formed in a side portion of the suction pipe so that the level tank and the suction pipe communicate with each other. The dust removing device according to any one of claims 1 to 4 , wherein the dust removing device is provided. From claim 1, characterized in that the branch drain pipe for flowing a part of the discharged circulation water from the system of waste water treatment process from the suction tube by the circulation pump is provided in the circulation line 6 of The dust remover of any one of Claims. The dust removing apparatus according to any one of claims 1 to 7 , wherein a chemical injection means is provided in the level tank and / or the suction pipe. The dust remover according to any one of claims 1 to 8 , wherein an auto strainer is interposed in the circulation line downstream of the circulation pump. The dust removing apparatus according to any one of claims 1 to 9 , wherein the dust-containing gas is a gas generated by a gasification furnace for organic fuel. Filtration apparatus according to any one of claims 1 to 10, wherein the dust-containing gas is characterized by containing the cyan. The dust removing apparatus according to any one of claims 1 to 11 , wherein the dust-containing gas contains a heavy metal. An organic fuel gasification system comprising the dust removing device according to any one of claims 1 to 12 . A liquid fuel synthesizing system using an organic fuel, comprising the dust removing device according to any one of claims 1 to 12 .

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