JP2013169515A - Fluid purifying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid purifying apparatus capable of preheating air A to a higher temperature than a conventional one without depending on an external preheating means for preheating air A used as an oxidizer, outside a reaction tank 20.SOLUTION: A fluid purifying apparatus is configured to perform oxidation decomposition of organic matter in waste fluid by a reaction tank 20 having a double structure of an outer cylinder 21 and an inner cylinder 22 disposed inside the outer cylinder 21, and receiving waste fluid received through an inflow pipe part 26, into the inner cylinder 22 while conveying air A received into an inter-cylinder space between the outer cylinder 21 and the inner cylinder 22, toward the inlet side of the inner cylinder 22 and then receiving the air A into the inner cylinder 22 near the inlet. The fluid purifying apparatus includes an internal conveying pipe 27 disposed in the inner cylinder 22 to communicate with the inlet of the inner cylinder 22 in a state of being submerged in a mixed fluid of waste fluid and air A in the inner cylinder 22, and conveying the air A received from the inlet, inside its own hollow part and then ejecting the air A from the hollow part so as to contact the mixed fluid in the inner cylinder 22.

Description

  The present invention relates to a fluid purification device that purifies a purification target fluid by oxidizing and decomposing the organic substance in the mixed fluid while pressurizing and heating a mixed fluid of the purification target fluid containing an organic substance and an oxidizing agent.

  Conventionally, as a method for purifying waste liquid such as human waste, sewage, settlement waste water, livestock manure, food factory waste water, a method of performing biological treatment using activated sludge has been generally used. However, with this method, it has been impossible to treat a high-concentration organic solvent waste liquid that hinders the activity of microorganisms in activated sludge at the same concentration, or a waste liquid containing plastic fine particles that cannot be biodegraded. In addition, in waste liquids that contain a lot of suspended solids that are not dissolved in the liquid, activated sludge is proliferating, leading to cost increases due to increased aeration and excess sludge treatment. It was necessary to previously remove the suspended solids by physicochemical treatment such as sieving or coagulation sedimentation.

  On the other hand, in recent years, development of a fluid purification apparatus that purifies waste liquid by oxidizing and decomposing organic matter in the mixed fluid while heating and pressurizing the mixed fluid of waste liquid and oxidant such as air has been performed. In this type of fluid purification apparatus, the organic substance in the mixed fluid is chemically oxidized and decomposed by heating and pressurizing the mixed fluid of the waste liquid and the oxidizing agent in the reaction tank. In such oxidative decomposition, it is possible to purify even a high-concentration organic solvent waste liquid or a plastic fine particle-containing waste liquid that was impossible with biological treatment. In addition, even a waste liquid containing a large amount of organic suspended solids can oxidize and decompose a large amount of suspended solids almost completely into water, nitrogen gas, and carbon dioxide. .

  As a reaction tank in such a fluid purification apparatus, a pressure balance type reaction tank described in Patent Document 1 is known. As shown in FIG. 1, the pressure balance type reaction tank 900 has a double cylinder structure including a cylindrical outer cylindrical body 901 and a cylindrical reaction vessel 902 disposed inside the cylindrical outer cylindrical body 901. ing. The outer cylindrical body 901 is made of a stainless material that is sufficiently thick to withstand high pressure. The reaction vessel 902 is made of a corrosion-resistant nickel alloy. On the lower lid of the outer cylindrical body 901, an air supply pipe 903 for pressure-feeding air as an oxidant into an inter-cylinder space formed between the outer cylindrical body 901 and the reaction vessel 902 inside the outer cylindrical body 901. Has penetrated. The reaction vessel 902 is cantilevered by the lower lid in a state where the lower end of the reaction vessel 902 penetrates the lower lid of the outer cylindrical body 901. A through-hole 902 a for receiving the inflow pipe 904 is formed in the upper end wall of the reaction vessel on the free end side of the reaction vessel 902. On the inner side of the outer cylindrical body 901, the end of the inflow pipe 904 that penetrates the outer cylindrical body upper cover from the outer side of the outer cylindrical body 901 and enters the outer cylindrical body 901 is provided on the upper end wall of the reaction vessel 902. It enters the inside of the reaction vessel 902 through the through-hole 902a. The waste liquid pressure-fed through the inflow pipe 904 flows into the reaction vessel 902 and then moves in the reaction vessel 902 from the upper side of the outer cylindrical body toward the lower side of the outer cylindrical body.

  In the pressure balance type reaction tank 900 having such a configuration, air as an oxidant moves as follows. In other words, the air pressure-fed into the inter-cylinder space between the outer cylindrical body 901 and the reaction vessel 902 via the air supply pipe 903 provided on the lower lid of the outer cylindrical body 901 moves downward in the inter-cylinder space. From the top to the top of the outer cylinder 901. In the vicinity of the upper lid, a gap is formed between a through port 902a provided in the upper end wall of the reaction vessel 902 and an inflow pipe 904 having a smaller diameter than the through port 902a. The inter-cylinder space between the outer cylindrical body 901 and the reaction vessel 902 communicates with the space inside the reaction vessel 902 through the gap. In the inter-cylinder space, the air that has moved to the vicinity of the upper lid of the outer cylindrical body 901 flows into the reaction vessel 902 through the gap between the through-hole 902a and the inflow pipe 904, and is then mixed with the waste liquid, It moves in the direction 902 from the upper side to the lower side.

  Since the inter-cylinder space between the outer cylindrical body 901 and the reaction vessel 902 and the reaction vessel 902 communicate with each other, the mixed fluid of the atmospheric pressure in the inter-cylinder space and the air and waste liquid in the reaction vessel 902 The pressure is almost the same. For this reason, a large pressure can be applied to the mixed fluid in the reaction vessel 902 without generating a pressure difference between the inside and outside of the reaction vessel 902. As a result, the reaction vessel 902 made of an expensive nickel alloy can be made into a non-breakdown pressure specification with a small thickness, and cost reduction can be realized.

  In the pressure balance type reaction vessel 900, air can be preheated in the space between the cylinders between the outer cylindrical body 901 and the reaction vessel 902. Specifically, in the reaction vessel 902 disposed in the outer cylindrical body 901, the mixed fluid generates heat due to the oxidative decomposition of organic matter or is heated by a heater (not shown) attached to the reaction vessel 902. The temperature is raised to a predetermined processing temperature. For this reason, the outer surface of the reaction vessel 902 is at a high temperature due to heat conduction from the mixed fluid inside the reaction vessel 902. In the inter-cylinder space between the outer cylindrical body 901 and the reaction vessel 902, air is preheated prior to flowing into the reaction vessel 902 by moving while contacting the outer surface of the hot reaction vessel 902. .

  When air is preheated in the inter-cylinder space between the outer cylindrical body 901 and the reaction vessel 902, the length of the reaction vessel 902 in the fluid conveyance direction can be shortened to reduce the size of the reaction vessel. Specifically, the temperature of the mixed fluid has not yet reached the predetermined temperature in the region in the vicinity of the through hole 902a in the entire region in the longitudinal direction in the reaction vessel 902. This is because the relatively low temperature waste liquid supplied from the inflow pipe 904 is not yet heated by the heater. The waste liquid existing in the region near the through-hole 902a is gradually heated to the processing temperature in the process of being conveyed from the through-hole 902a side toward the discharge pipe side while being mixed with air to become a mixed fluid. Go. In order to decompose the organic substances in the waste liquid almost completely, it is necessary to promote the oxidative decomposition of the organic substances in a state where the mixed fluid is heated to a predetermined processing temperature and kept under a predetermined pressure for a predetermined processing time. . For this reason, it is necessary to increase the length of the reaction container 902 in the fluid conveyance direction as the time required for temperature increase increases. In the pressure balance type reaction tank 900 shown in the figure, the time required to raise the temperature of the mixed fluid in the reaction vessel 902 is preliminarily heated in the inter-cylinder space between the outer cylindrical body 901 and the reaction vessel 902. Thus, the length of the reaction vessel 902 can be shortened.

  However, it is not always possible to preheat air up to the processing temperature in the reaction vessel 902 in the inter-cylinder space between the outer cylindrical body 901 and the reaction vessel 902. If the time for passing the air through the inter-cylinder space is relatively short, the air flows into the reaction vessel 902 without increasing the temperature so much. Further, if an external preheating means for preheating the air outside the balanced reaction tank 900 is provided for the purpose of surely preheating the air to a desired temperature and then flowing into the reaction vessel 902, the cost increases. End up.

  The present invention has been made in view of the above background, and the object of the present invention is to use an oxidant in the past without using an external preheating means for preheating the oxidant such as air outside the reaction tank. It is to provide a fluid purification device that can be preheated to a higher temperature.

  In order to achieve the above object, the present invention provides an inflow for causing a purification target fluid to flow into an end portion on an inlet side of a processing target fluid with respect to the inner cylinder among the entire area in the longitudinal direction of the inner cylinder. In order to introduce the pipe and the oxidant into the inter-cylinder space between the outer cylinder and the inner cylinder, the outlet side of the fluid from the inner cylinder out of the entire area in the longitudinal direction of the outer cylinder An oxidant introduction port provided at or near the end of the inner cylinder, and an oxidant introduced into the inter-cylinder space into the inner cylinder to enter the inner end of the inner cylinder. And a reaction tank that decomposes organic matter in the mixed fluid by an oxidation reaction while heating and pressurizing the mixed fluid of the purification target fluid and the oxidant inside the inner cylindrical body. In the fluid purification device provided, it is immersed in a fluid to be purified inside the inner cylindrical body. In the state, it is disposed inside the inner cylinder so as to communicate with the oxidant inlet, and extends from the inlet side to the outlet side of the inner cylinder, and then from the outlet side to the inlet side. The oxidant having a folded structure and received in the hollow of the oxidant from the inlet of the oxidant is transported in the hollow and then discharged to the inlet side end region in the inner cylinder for purification. It is characterized in that an internal transfer pipe that is brought into contact with the target fluid is provided.

  In the present invention, the oxidant introduced into the inter-cylinder space between the outer cylinder and the inner cylinder is moved from the outlet side of the inner cylinder to the inlet side in the inter-cylinder space in the same manner as the conventional balanced reaction tank. In the process of transporting in the heading direction, preheating is performed by heat conduction from the outer surface of the inner cylinder. Further, unlike the conventional balance type reaction tank, the air preheated in the space between the cylinders is further preheated as follows and then mixed with the purification target fluid in the inner cylinder. That is, the air preliminarily heated in the inter-cylinder space passes through the oxidant inlet provided at the inlet side end of the inner cylinder and flows into the internal transfer pipe in the inner cylinder. The internal transfer pipe is immersed in the mixed fluid in the inner cylinder, and is heated to a temperature substantially equal to a predetermined processing temperature by heat conduction from the purification target fluid. For this reason, the oxidant flowing into the internal transfer pipe is further preheated by heat conduction from the inner wall of the internal transfer pipe while being transferred in the internal transfer pipe. In the internal transfer pipe, after the oxidant moves along the internal transfer pipe from the inlet side to the outlet side of the inner cylinder, it is folded back from the outlet side of the inner cylinder toward the inlet side according to the folded shape of the inner transfer pipe. Thus, the oxidant is preheated in the internal transfer pipe for a relatively long time. And if it moves to the area | region of the edge part by the side of the inlet_port | entrance in an inner cylinder, it will discharge | emit from an internal conveyance pipe and will be mixed with the process target fluid in an inner cylinder. In such a configuration, in addition to preheating in the process of transporting the oxidant from the outlet side of the inner cylinder toward the inlet side in the inter-cylinder space, in the hollow of the inner transport pipe, from the inlet side of the inner cylinder. Pre-heating even during the process of transporting to the outlet side or returning from the outlet side to the inlet side, so that the temperature is pre-heated to a higher temperature compared to the conventional pre-heating only in the space between the cylinders. To do. Therefore, the oxidant can be preheated to a higher temperature than before without using the external preheating means.

The schematic block diagram which shows the pressure balance type reaction tank of patent document 1. FIG. The schematic block diagram which shows the fluid purification apparatus which concerns on embodiment. The longitudinal cross-sectional view which shows the reaction tank of the fluid purification apparatus. The perspective view which shows the inner cylinder of the reaction tank. The perspective view which shows the internal conveyance pipe | tube of the reaction tank with the end wall of an inner cylinder. The perspective view which shows the modification of the same internal conveyance pipe | tube.

Hereinafter, an embodiment of a fluid purification apparatus to which the present invention is applied will be described.
First, a basic configuration of the fluid purification device according to the embodiment will be described. FIG. 2 is a schematic configuration diagram illustrating a fluid purification device according to the embodiment. The fluid purification device according to the embodiment includes a raw water tank 1, a stirrer 2, a raw water supply pump 3, a raw water pressure gauge 4, a raw water inlet valve 5, an oxidant pressure feed pump 6, an oxidant pressure gauge 7, an oxidant inlet valve 8, and heat. The exchanger 9, the heat medium tank 10, the heat exchange pump 11, the outlet pressure gauge 12, the outlet valve 13, the reaction tank 20, a control unit (not shown), and the like are provided.

  The control unit individually corresponds to a power feeding circuit composed of a combination of an earth leakage breaker, a magnet switch, a thermal relay, and the like to each of the agitator 2, the raw water supply pump 3, the oxidant pressure feed pump 6, the oxidant pressure feed pump 6, and the heat exchange pump 11. Have as much as you want. And the on / off of the power supply with respect to these apparatuses is controlled separately by turning on / off the magnet switch of a feed circuit with the control signal from a programmable sequencer.

  The raw water pressure gauge 4, the oxidant pressure gauge, and the outlet pressure gauge 12 each output a voltage having a value corresponding to the pressure detection result. Moreover, the thermometer 24 of the reaction vessel 20 outputs a voltage corresponding to the temperature detection result. The voltages output from these measuring devices are individually converted into digital data by an A / D converter (not shown) and then input to the programmable sequencer as sensing data. The programmable sequencer controls driving of various devices based on the sensing data.

  In the raw water tank 1, a waste liquid W containing an organic substance having a relatively large molecular weight is stored in an untreated state. The waste liquid W is composed of at least one of an organic solvent waste liquid, a papermaking waste liquid generated in the paper manufacturing process, and a toner manufacturing waste liquid generated in the toner manufacturing process. Papermaking waste liquid and toner manufacturing waste liquid may contain persistent organic substances.

  The stirrer 2 stirs the waste liquid W as the purification target fluid to uniformly disperse suspended solids contained in the waste liquid, thereby achieving a uniform organic substance concentration. The waste liquid W in the raw water tank 1 is continuously pumped by the raw water supply pump 3 composed of a high pressure pump, and flows into the reaction tank 20 through the raw water inlet valve 5 at a high pressure. The raw water inlet valve 5 plays the role of a check valve, and allows the waste liquid W pumped from the raw water supply pump 3 to flow from the raw water supply pump 3 side to the reaction tank 20 side described later, Prevent reverse flow.

  The reaction tank 20 has a double cylinder structure including an outer cylinder 21 and an inner cylinder 22 disposed inside the reaction cylinder 20. The waste liquid W that has passed through the raw water inlet valve 5 flows into the inner cylinder 22 of the reaction tank 20 through an inflow pipe portion (26 in FIG. 3) described later.

  The inflow pressure of the waste liquid W due to the driving of the raw water supply pump 3 is detected by the raw water pressure gauge 4 disposed on the upstream side of the raw water inlet valve 5 and is input to the programmable sequencer of the control unit as sensing data. The inflow pressure of the waste liquid W when the raw water supply pump 3 is driven and the pressure in the inner cylinder 22 are substantially the same. The programmable sequencer determines whether the pressure in the inner cylinder 22 is appropriate based on the detection result of the pressure sent from the raw water pressure gauge 4 when the raw water supply pump 3 is being driven.

  The oxidant pressure feed pump 6 composed of a compressor sends air taken in as an oxidant to the reaction tank 20 through the oxidant inlet valve 8 while compressing the air to a pressure similar to the inflow pressure of the waste liquid W. The oxidant inlet valve 8 plays the role of a check valve, and allows the air fed from the oxidant pressure feed pump 6 to flow from the oxidant pressure feed pump 6 side to the reaction tank 20 side, Prevent reverse flow.

  The air pumped into the reaction tank 20 enters the inter-cylinder space between the outer cylinder 21 and the inner cylinder 22 and then flows into the vicinity of the longitudinal inlet of the inner cylinder 22. And it mixes with the waste liquid W sent in the inner cylinder 22 by the inflow pipe, and turns into a mixed fluid.

  The inflow pressure of the air generated by driving the oxidant pump 6 is detected by an oxidant pressure gauge 7 disposed upstream of the oxidant inlet valve 8 and input as sensing data to a programmable sequencer of the control unit. . The inflow pressure of air when the oxidant pressure gauge 7 is driven and the pressure in the reaction tank 20 are substantially the same. The programmable sequencer determines whether or not the pressure in the reaction vessel 20 is appropriate based on the detection result of the pressure sent from the oxidant pressure gauge 7 when the oxidant pressure feed pump 6 is being driven.

  The amount of air pumped by driving the oxidant pump 6 is determined based on the stoichiometric amount of oxygen required to completely oxidize the organic matter in the waste liquid. More specifically, it is necessary for the complete oxidation of organic matter based on the organic matter concentration, nitrogen concentration, phosphorus concentration, etc. in the waste liquid W, such as COD (Chemical Oxygen Demand), total nitrogen (TN), and total phosphorus (TP) of the waste liquid. The amount of oxygen is calculated, and the pumping amount of air is set based on the result.

  The inflow of air is set by the worker, but the type of organic matter contained in the waste liquid W is stable over time, and the physical properties such as turbidity, light transmittance, electrical conductivity, specific gravity, etc. When the correlation with the amount of oxygen is relatively good, the programmable sequencer is configured to perform the process of automatically correcting the above-mentioned control range based on the result of detecting the physical property by a sensor or the like. May be.

  As the oxidizing agent, in addition to air, any one of oxygen gas, ozone gas, hydrogen peroxide water, or a mixture of two or more of them can be used. From the viewpoint of suppressing the release of heat from the inner cylinder 22, it is preferable to use a gas such as air, oxygen gas, or ozone gas. This is because the gas has a lower thermal conductivity than the liquid, so that the gas can function as a heat insulating material by filling the space between the cylinders with the gas.

  A heater (not shown) is wound around the outer surface of the inner cylinder 22 to heat the mixed fluid in the inner cylinder 22. In addition to increasing the temperature of the mixed fluid in the inner cylinder 22 by being heated by the heater, the temperature of the mixed fluid is also increased by heat generated by the oxidative decomposition of the organic matter. When the waste liquid W contains an organic substance at a high concentration, the mixed fluid may be heated to a desired temperature only by a large amount of heat generated when a large amount of the organic substance is oxidatively decomposed. In this case, heating by the heater is performed only when the apparatus is started up, and the heater can be stopped after the oxidative decomposition is started.

  Examples of the pressure applied to the mixed fluid in the inner cylinder 22 include a range of 0.5 to 30 Mpa (desirably 5 to 30 Mpa). The pressure in the inner cylinder 22 is adjusted by an outlet valve 13 described later. When the pressure in the inner cylinder 22 becomes higher than the threshold value, the outlet valve 13 automatically opens the valve and discharges the fluid mixture in the inner cylinder 22 to the outside, thereby maintaining the pressure in the inner cylinder 22 near the threshold value. To do.

  Examples of the temperature of the mixed fluid in the inner cylinder 22 include 100 to 700 ° C. (desirably 200 to 550 ° C.). The temperature is adjusted by turning on / off the heater described above or turning on / off the operation of the heat exchanger 9 described later.

  When temperature = 374.2 ° C. or higher and pressure = 21.8 MPa or higher are adopted as temperature and pressure conditions, the critical temperature and critical pressure of water are exceeded, and the critical temperature and critical pressure of air are also exceeded. In this state, the mixed fluid becomes a supercritical fluid having an intermediate property between liquid and gas. In such a supercritical fluid, the organic matter is well dissolved in the supercritical fluid and is in good contact with air, so that the oxidative decomposition of the organic matter proceeds rapidly.

  As a condition of temperature and pressure, a relatively high temperature of less than 374.2 ° C. and a pressure of 21.8 MPa or more may be adopted, and the waste liquid in the mixed fluid in the inner cylinder 22 may be a subcritical fluid. . Further, as the temperature and pressure conditions, a relatively high pressure of temperature = 200 ° C. or higher (desirably 374.2 ° C. or higher) and pressure = 21.8 MPa (desirably 10 MPa or higher) is adopted, and the inner cylinder 22 The waste liquid in the mixed fluid may be converted into high-temperature and high-pressure steam.

  In the inner cylinder 22, the mixed fluid is brought into a high temperature and high pressure state to promote oxidative decomposition of organic matter and ammonia nitrogen in the mixed fluid. The mixed fluid obtained by oxidizing and decomposing organic matter and ammonia nitrogen is discharged from the reaction tank 20.

  FIG. 3 is a longitudinal sectional view showing the reaction tank 20. FIG. 4 is a perspective view showing the inner cylinder 22 of the reaction tank 20. A heater 23 for heating the waste liquid W is wound around the inner cylinder 22 (see FIG. 4). The inner cylinder 22 is a cylinder made of titanium resistant to acid. The outer cylinder 21 is formed thick so that it can withstand high pressure. On the other hand, since the inner cylinder 22 is required to have corrosion resistance rather than pressure resistance, titanium that exhibits excellent corrosion resistance is adopted as a material. In the inner cylinder 22, hydrochloric acid derived from a chloro group of organic chloride and sulfuric acid derived from a sulfonyl group such as an amino acid may be generated, and the inner wall of the inner cylinder 22 may be placed under strong acidity. For this reason, a cylinder made of titanium having excellent corrosion resistance is adopted as the inner cylinder 22. However, since titanium is a very expensive material, if the thickness of the inner cylinder 22 is increased to a value that can withstand high pressure, the cost becomes very high. Therefore, the outer cylinder 21 is disposed outside the inner cylinder 22, and the required pressure resistance is exhibited by the outer cylinder 21 made of stainless steel or the like that is cheaper than titanium. The pressure in the inter-cylinder space between the inner cylinder 22 and the outer cylinder 21 becomes almost the same value as the pressure in the inner cylinder 22 due to the pressure-fed air, so that it is large for the inner cylinder 22 made of thin titanium. No pressure is applied.

  The waste liquid W pumped toward the reaction tank 20 by the raw water supply pump (3 in FIG. 2) passes through the raw water inlet valve (5 in FIG. 2) and then is connected to the outlet side of the raw water inlet valve. Enter the tube 15. The feed pipe 15 is connected to an inflow pipe portion 26 provided on the inlet side of the reaction tank 20 by an inlet joint 17. The waste liquid W pumped into the reaction tank 20 from the feed pipe 15 flows into the inner cylinder 22 through the inflow pipe portion 26 in the reaction tank 20. Then, it moves from the left side to the right side in the drawing along the longitudinal direction in the inner cylinder 20.

  On the other hand, the air A pumped into the reaction tank 20 by the oxidant introduction pump (6 in FIG. 2) flows into the inter-cylinder space between the outer cylinder 21 and the inner cylinder 22. Then, while being heated by contact with the outer surface of the inner cylinder 22 and the heater 23, the inter-cylinder space is moved along the longitudinal direction from the right side to the left side in the drawing. A communication opening 22 a is provided on the left end surface of the inner cylinder 22 in the drawing. The communication opening 22a is for communicating the inter-cylinder space with an internal transfer pipe 27 described later. Air A in the inter-cylinder space between the outer cylinder 21 and the inner cylinder 22 enters the inner cylinder 22 through the communication opening 22a.

  In FIG. 3, an inner conveyance pipe 27 is disposed in the inner cylinder 22 and is immersed in the mixed fluid in the inner cylinder 22. One end of the internal transfer pipe 27 communicates with the communication opening 22 a in a state of being fixed to the end wall of the inner cylinder 22. The air A pumped into the inter-cylinder space between the outer cylinder 21 and the inner cylinder 22 moves in the inter-cylinder space from the right side to the left side in the figure, and the outer surface of the inner cylinder 22 and the heater (see FIG. 4). 23) is preheated by contact. Then, when it moves to the left in the figure from the inner cylinder 22, it enters the inner cylinder 22 through a communication opening (22 a in FIG. 4) provided in the end wall of the inner cylinder 22, and inside the inner transfer pipe 27. Flow into.

  Examples of the heater 23 include a contact heating type ceramic heater and a sheath heater. Note that resistance heating can also be performed by passing an electric current through the inner cylinder 22. Further, the heat release from the inner cylinder 22 may be suppressed by covering the inner cylinder 22 with a heat insulating material from above the heater 23. In this case, the preheating of the air in the inter-cylinder space is not performed. However, the air can be preheated to a desired temperature by making the internal conveyance pipe 27 longer by that amount.

  The internal conveyance pipe 27 immersed in the mixed fluid in the inner cylinder 22 is in a state where the temperature is raised to substantially the same temperature as the mixed fluid by heat conduction from the mixed fluid. For this reason, the air A flowing into the internal transfer pipe 27 is further preheated by heat conduction from the inner wall of the internal transfer pipe 27 while being transferred in the internal transfer pipe 27. In such a configuration, in addition to preheating the air A in the inter-cylinder space, the air A is also pre-heated in the hollow of the internal transfer tube 27, so that the air A is more preliminarily heated only in the inter-cylinder space. Preheat to high temperature. Therefore, the air A can be preheated to a higher temperature than before without using the external preheating means.

  FIG. 5 is a perspective view showing the internal transfer pipe 27 together with the end wall of the inner cylinder. The arrow direction in the figure indicates the transport direction of the mixed fluid inside the inner cylinder. The internal conveyance pipe 27 has a shape that extends from the upstream side toward the downstream side along the conveyance direction of the mixed fluid and then turns back from the downstream side toward the upstream side. As a result, as shown in FIG. 3, after the air A is transported by the internal transport pipe 27 over a relatively long distance and sufficiently heated, the air A is transported in the inner cylinder 22 in the transport direction. It can be discharged from the internal transfer pipe 27 in the vicinity of the upstream end and mixed with the waste liquid W immediately after entering the inner cylinder 22.

  In FIG. 3, the mixed fluid that has moved to the vicinity of the right end in the drawing of the inner cylinder 22 is in a state in which organic substances and inorganic compounds are almost completely oxidized and decomposed. A transport pipe 16 for transporting the purification target fluid purified in the inner cylinder 22 is connected to the downstream end of the inner cylinder 22 in the fluid transport direction via the outlet joint 18. The purified fluid to be purified enters the transport pipe 16.

  In the transport pipe 16, the purified fluid to be purified is cooled to become a liquid. When new waste liquid W flows into the inner cylinder 22 from the inflow pipe portion 26, the internal pressure of the inner cylinder 22 increases accordingly. Then, the pressure of the liquid in the transport pipe 16 also increases. An outlet valve (13 in FIG. 2) is connected to the end of the transport pipe 16. When the pressure in the transport pipe 16 becomes higher than the threshold value, the outlet valve automatically opens the valve and discharges the liquid in the transport pipe 16 to keep the pressure in the transport pipe 16 lower than the threshold value. The liquid discharged from the inside of the transport pipe 16 by the outlet valve 13 is divided into a processing liquid and a gas by rapidly reducing the pressure to near atmospheric pressure. Then, the processing liquid is stored in the processing liquid tank. Gas is also released into the atmosphere.

  The treatment liquid contains almost no suspended solids or organic matter because very low molecular weight organic matter that cannot be removed by biological treatment with activated sludge has been almost completely oxidized and decomposed. It contains only a small amount of inorganic material that could not be oxidized. Even as it is, it can be reused as industrial water depending on the application. Further, if a filtration process using an ultrafiltration membrane is performed, it can be diverted to an LSI cleaning liquid or the like. The gas separated from the mixed fluid after the treatment is mainly composed of carbon dioxide and nitrogen gas.

  In the reaction tank 20, all reactions for oxidizing and decomposing substances contained in the mixed fluid are performed in the inner space of the inner cylinder 22. In the inner space of the inner cylinder 22, the mixed fluid flows from the left side to the right side in the drawing along the longitudinal direction of the cylinder. A catalyst for promoting oxidative decomposition of organic matter and ammonia nitrogen may be provided in the inner cylinder 22 through which the mixed fluid flows in this manner. As a catalyst for promoting the oxidative decomposition of organic matter or ammonia nitrogen, at least of Ru, Pd, Rh, Pt, Au, Ir, Os, Fe, Cu, Zn, Ni, Co, Ce, Ti, Mn and C It is desirable to use one containing any one element.

  When the organic substance concentration in the waste liquid W is relatively high, a large amount of heat is generated by oxidative decomposition of the organic substance. For this reason, as described above, heating by the heater (23) is necessary at the initial stage of operation. However, depending on the concentration of organic matter, after the oxidative decomposition of the organic matter is started, the mixed fluid is caused by the heat generated by the oxidative decomposition. It may be possible to raise the temperature to a predetermined temperature only by heat generation. Therefore, the programmable sequencer of the control unit turns off the heater (23) as the heating means when the detection result of the temperature in the inner cylinder 22 by the thermometer (24) becomes higher than a predetermined temperature. To do. Thereby, useless energy consumption can be suppressed.

  Further, when the organic matter concentration of the waste liquid W is very high, the amount of heat generated by the oxidative decomposition of the organic matter causes the waste liquid W and air A newly flowing into the inner cylinder 22 to rise to a predetermined temperature. If the temperature exceeds the required amount of heat, the temperature in the inner cylinder 22 may continue to rise. Therefore, the programmable sequencer of the control unit supplies the raw water W by the raw water supply pump (3) when the detection result of the temperature in the inner cylinder 22 by the thermometer (24) becomes higher than a predetermined upper limit temperature. A process of reducing the feed rate sent to the first decomposition reaction unit 22a or the feed rate sending the air A to the first decomposition reaction unit 22a by the oxidant pressure feed pump (6) is performed. Thereby, it can prevent that the temperature in the inner cylinder 22 becomes higher than upper limit temperature. When the heat exchanger 9 to be described later is used not only for exchanging heat with the transfer pipe 16 but also for exchanging heat with the outer cylinder 21, the waste liquid W and air A are fed. Instead of decreasing the amount, the amount of heat exchange fluid sent around the outer cylinder 21 may be increased.

  A heat exchanger 9 is mounted on the outer wall of the transport pipe 16 that transports the mixed fluid that has passed through the inner cylinder 22 while cooling. The main body of the heat exchanger 9 is composed of an outer tube that covers the outer wall of the transfer tube 16, and a space between the outer tube and the outer wall of the transfer tube 16 is filled with a heat exchange fluid such as water. Then, heat exchange between the outer wall of the transfer pipe 16 and the heat exchange fluid is performed. When the reaction tank 20 is operated, a very high-temperature liquid flows inside the transfer pipe 16, so heat is transferred from the transfer pipe 16 to the heat exchange fluid in the heat exchanger 9, and the heat exchange fluid is heated. The transport direction of the heat exchange fluid in the heat exchanger 9 is opposite to the transport direction of the liquid in the transport pipe 16 so as to perform so-called countercurrent heat exchange. That is, the heat exchange fluid is sent from the outlet valve 13 side to the reaction tank 20 side. This is performed by the heat exchange pump 11 that sends the heat exchange fluid in the heat medium tank 10 to the heat exchanger 9 while sucking the heat exchange fluid. The heat exchange fluid heated through the heat exchanger 9 is sent to a generator through a pipe (not shown). In the generator, power generation is performed by rotating the turbine with an air flow generated when the heat exchange fluid that has been heated to increase the pressure from a liquid to a gas state. A part of the heat exchange fluid that has passed through the heat exchanger 9 may be conveyed to the inflow pipe section 26 or the raw water tank 1 by a branch pipe and used for preheating the waste liquid W.

  An exit thermometer (not shown) for detecting the temperature of the liquid in the transport pipe 16 is provided in the vicinity of the outlet valve 13 in the transport pipe 16. The programmable sequencer of the control unit controls the drive of the heat exchange pump 11 so that the detection result by the outlet thermometer is maintained within a predetermined numerical range. Specifically, when the detection result by the outlet thermometer reaches a predetermined upper limit temperature, the amount of heat exchange fluid supplied to the heat exchanger 9 is increased by increasing the drive amount of the heat exchange pump 11, The cooling function by the exchanger 9 is enhanced. On the other hand, when the detection result by the outlet thermometer reaches a predetermined lower limit temperature, the amount of heat exchange fluid supplied to the heat exchanger 9 is reduced by reducing the drive amount of the heat exchange pump 11 to thereby exchange heat. The cooling function by the vessel 9 is reduced. In such a configuration, the temperature of the liquid in the transport pipe 16 can be maintained within a certain range by appropriately adjusting the heat exchange amount.

  As shown in FIG. 6, the inner conveyance tube 27 may be shaped to be folded three times in the inner cylinder with the aim of raising the temperature more reliably to a desired temperature. Alternatively, the shape may be folded back 5 times or more and an odd number of times. By turning back at an odd number of times, the discharge position of the air from the inner transfer pipe 27 is set to the vicinity of the upstream end in the fluid transfer direction of the inner cylinder, and the preheated air immediately after flowing into the inner cylinder Can be mixed.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
[Aspect A]
A double structure in which a cylindrical inner cylinder (for example, inner cylinder 22) is disposed inside a cylindrical outer cylinder (for example, outer cylinder 21), and the entire area in the longitudinal direction of the inner cylinder. Among them, an inflow pipe (for example, the inflow pipe section 26) for allowing the purification target fluid to flow into an end portion on the inlet side of the processing target fluid with respect to the inner cylindrical body, and an oxidizing agent (for example, air A) In order to introduce into the inter-cylinder space between the outer cylindrical body and the inner cylindrical body, at the end portion on the outlet side of the fluid from the inner cylindrical body or in the vicinity thereof in the entire area in the longitudinal direction of the outer cylindrical body. An oxidant inlet provided, and an oxidant inlet (provided at an inlet side end of the inner cylinder) for allowing the oxidant introduced into the inter-cylinder space to enter the inner cylinder ( For example, a communication opening 22a) is provided, and a mixed fluid of a purification target fluid and an oxidant is formed inside the inner cylindrical body. In a fluid purification device including a reaction tank (for example, reaction tank 20) that oxidizes and decomposes organic matter in a mixed fluid while applying heat and pressure, the oxidant enters while immersed in a purification target fluid inside the inner cylinder. Provided inside the inner cylinder so as to communicate with the mouth, and extending from the inlet side to the outlet side of the inner cylinder, and then folded back from the outlet side to the inlet side, In addition, the oxidant received in the hollow of the oxidant from the inlet of the oxidant is transported in the hollow and then discharged to the region of the inlet side end portion of the inner cylinder so as to come into contact with the fluid to be purified. A transport pipe (for example, the internal transport pipe 27) is provided.

[Aspect B]
Aspect B is the aspect A in which heating means for heating the purification target fluid inside the inner cylindrical body is disposed inside the inner cylindrical body, or is brought into contact with the outer surface of the inner cylindrical body. It is characterized by being disposed. In such a configuration, it is possible to reliably raise the temperature of the fluid to be purified and the oxidant in the inner cylinder to a desired temperature by heating with the heating means.

20: Reaction tank 21: Outer cylinder (outer cylinder)
22: Inner cylinder (inner cylinder)
22a: Communication opening (oxidant entrance)
23: Heater (heating means)
26: Inflow pipe section (inflow pipe)
27: Internal transfer pipe A: Air (oxidant)
W: Waste liquid (Purified fluid)

JP 2001-170334 A

Claims (2)

It has a double structure in which a cylindrical inner cylinder is disposed inside a cylindrical outer cylinder, and of the entire area in the longitudinal direction of the inner cylinder, the inlet side of the fluid to be processed with respect to the inner cylinder An inflow pipe for allowing the fluid to be purified to flow into the end of the tube, and a longitudinal direction of the outer cylinder in order to introduce an oxidant into the inter-cylinder space between the outer cylinder and the inner cylinder. The oxidant inlet provided at or near the end of the fluid outlet from the inner cylinder, and the oxidant introduced into the inter-cylinder space enter the inside of the inner cylinder. And an oxidant inlet provided at an end of the inner cylinder on the inlet side, and heating and pressurizing the mixed fluid of the purification target fluid and the oxidant inside the inner cylinder. In a fluid purification apparatus comprising a reaction tank for decomposing organic matter in a mixed fluid by an oxidation reaction,
The inner cylinder is disposed inside the inner cylinder so as to communicate with the oxidant inlet in a state of being immersed in the purification target fluid inside the inner cylinder, and is directed from the inlet side to the outlet side of the inner cylinder. The oxidant received in the hollow from the oxidant inlet and then transported in the hollow after the oxidant has been transferred from the outlet side to the inlet side. A fluid purification apparatus comprising: an internal conveyance pipe that is discharged to a region of an end portion on the inlet side and brought into contact with a fluid to be purified. The fluid purification device according to claim 1,
A heating means for heating the purification target fluid inside the inner cylinder is arranged inside the inner cylinder or arranged in contact with the outer surface of the inner cylinder. Fluid purification device.

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