Polymeric ferric chloride catalyzed oxidation reactor

Abstract

The utility model relates to sewage treatment technical field discloses a kind of polymeric ferric chloride catalytic oxidation reaction tower, including tower body, the bottom of the tower body is equipped with vortex mixing chamber, the bottom of the one side of the tower body is fixed with the tangential water inlet pipe that communicates with vortex mixing chamber, the middle part of the tangential water inlet pipe is fixedly installed with venturi, the inside of the tower body is located above vortex mixing chamber and is equipped with multiple support sieve plates, the surface of the support sieve plate is laid with a layer of granular polymeric ferric chloride catalyst, and shallow bed is formed;The utility model utilizes the negative pressure effect of venturi throat, and automatically inhales the oxygen-rich tail gas collected by top gas-collecting hood into water inlet system, realizes the recycling of unused oxygen, significantly reduces oxidant addition cost, and reduces tail gas treatment load.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a polyferric chloride catalytic oxidation reaction tower. Background Technology

[0002] In the field of industrial wastewater treatment, catalytic oxidation technology (especially Fenton-like systems based on iron-based catalysts) is widely used due to its high efficiency in removing recalcitrant organic pollutants. Currently, fixed-bed or fluidized-bed reactors with solid iron-based catalysts (such as polyferric chloride) are used, but the following problems still exist: the catalyst in fixed-bed reactors is densely packed, which is prone to bed blockage due to suspended solids deposition or iron sludge adhesion, resulting in increased pressure drop and requiring frequent backwashing; the water flow path is singular, and the mass transfer interface is slowly renewed; although fluidized-bed reactors can avoid blockage, catalyst wear is severe at high flow rates, and energy consumption is high; bubbles are prone to coalescence, and oxygen mass transfer efficiency is still not ideal; a large amount of unused oxygen generated by traditional aeration methods escapes with the exhaust gas, which wastes oxidant and increases the cost of exhaust gas treatment. Utility Model Content

[0003] The purpose of this invention is to provide a catalytic oxidation reaction tower for polyferric chloride, which has the advantages of high oxygen recycling rate and good anti-clogging performance.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a catalytic oxidation reaction tower for polyferric chloride, comprising a tower body, a vortex mixing chamber at the bottom of the tower body, a tangential water inlet pipe fixedly disposed on one side of the bottom of the tower body communicating with the vortex mixing chamber, a Venturi tube fixedly installed in the middle of the tangential water inlet pipe, a plurality of supporting sieve plates disposed inside the tower body above the vortex mixing chamber, a layer of granular polyferric chloride catalyst being laid on the surface of the supporting sieve plates to form a shallow bed, a top cover fixedly disposed at the top of the tower body, a gas collecting hood fixedly disposed inside the top cover, and the gas outlet of the gas collecting hood being connected to the throat of the Venturi tube through a connecting pipe.

[0005] A further feature of this invention is that a mud discharge hopper communicating with the vortex mixing chamber is fixedly provided at the bottom end of the tower body, a mud discharge valve is installed at the bottom of the mud discharge hopper, and a support leg is fixedly provided at the bottom of the mud discharge hopper.

[0006] A further feature of this invention is that a feed pipe communicating with the vortex mixing chamber is fixedly provided at the bottom of the other side of the tower body, and a control valve is installed on the surface of the feed pipe.

[0007] A further feature of this invention is that baffles are fixedly provided between adjacent support screen plates and are fixedly connected to the inner wall of the tower body. The baffles are distributed circumferentially and are inclined, and the inclination directions of adjacent baffles are opposite.

[0008] A further feature of this invention is that mounting plates are fixedly provided on the top of the tower body and the bottom of the top cover, and the two mounting plates are fixedly connected by mounting bolts.

[0009] A further feature of this invention is that a water outlet pipe is fixedly provided in the middle of the top cover, and the inner side of the top cover is fixedly connected to the top of the gas collection hood via a mounting base.

[0010] A further feature of this invention is that an air outlet pipe is provided on the top of the side of the air collection hood, and the bottom of the water outlet pipe is lower than the bottom of the air outlet pipe.

[0011] A further feature of this invention is that an air inlet pipe is provided at the throat of the venturi tube, the air inlet pipe is fixedly connected to the air outlet pipe through a connecting pipe, and a one-way valve is provided on the surface of the air inlet pipe, with the flow direction of the one-way valve being inward.

[0012] In summary, this invention has the following beneficial effects: It boasts a high oxygen recycling rate, utilizing the negative pressure effect at the throat of the Venturi tube to automatically draw the oxygen-enriched exhaust gas collected by the top gas collection hood into the inlet water system, achieving the recycling and reuse of unused oxygen, significantly reducing oxidant dosage costs and exhaust gas treatment load; it exhibits outstanding anti-clogging performance, with the tangential water inlet in the bottom vortex mixing chamber forming a high-speed vortex that can separate heavier impurities in the wastewater and entrain additional catalyst; the conical sludge discharge hopper periodically discharges settled iron sludge, combined with the shallow bed catalyst arrangement, providing triple protection. The bottom layer avoids the risk of tower blockage; the three-phase mass transfer efficiency is doubled; the venturi tube premixing enhances gas-liquid dissolution; the vortex mixing chamber achieves preliminary homogenization of gas-liquid-solid; the staggered inclined design of the baffles forces the fluid to change direction and rise, extending the reaction path, simultaneously breaking bubbles, renewing the gas-liquid interface, and slightly disturbing the catalyst bed, significantly improving the pollutant degradation rate; the catalyst utilization rate is optimized, the vortex flow ensures uniform dispersion of the supplementary catalyst, and the shallow bed structure reduces pressure loss; the micro-disturbance induced by the baffles prevents catalyst caking and deactivation, reduces particle wear, and extends service life. Attached Figure Description

[0013] Figure 1 This is one of the three-dimensional structural schematic diagrams of this utility model; Figure 2 This is the second three-dimensional structural schematic diagram of the present invention; Figure 3 This is one of the cross-sectional structural schematic diagrams of this utility model; Figure 4 This is the second cross-sectional structural schematic diagram of the present invention; Figure 5 This utility model Figure 2 A magnified structural diagram at point A.

[0014] In the diagram: 1. Tower body; 101. Sludge hopper; 102. Sludge valve; 103. Support leg; 2. Vortex mixing chamber; 201. Tangential water inlet pipe; 202. Venturi tube; 203. Air inlet pipe; 204. Check valve; 205. Feed pipe; 206. Control valve; 3. Support screen plate; 301. Baffle plate; 4. Top cover; 401. Water outlet pipe; 402. Gas collection hood; 403. Mounting base; 404. Air outlet pipe; 405. Connecting pipe. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings of the embodiments thereof.

[0016] Please see Figures 1-5 In this embodiment of the present invention, a catalytic oxidation reaction tower for polyferric chloride includes a tower body 1. A vortex mixing chamber 2 is provided at the bottom of the tower body 1. A tangential water inlet pipe 201 communicating with the vortex mixing chamber 2 is fixedly provided at the bottom of one side of the tower body 1. A Venturi tube 202 is fixedly installed in the middle of the tangential water inlet pipe 201. Wastewater enters tangentially at a certain pressure, forming a high-speed rotating vortex in the vortex mixing chamber 2. Multiple supporting sieve plates 3 are provided inside the tower body 1 above the vortex mixing chamber 2. Small holes with uniformly distributed openings, smaller than the diameter of the catalyst, are formed on the surface of the supporting sieve plates 3. The catalyst particles ensure smooth flow of water and gas. A layer of granular polyferric chloride catalyst is laid on the surface of the supporting sieve plate 3 to form a shallow bed. A top cover 4 is fixedly installed at the top of the tower body 1. A gas collecting hood 402 is fixedly installed inside the top cover 4. The gas outlet of the gas collecting hood 402 is connected to the throat of the venturi tube 202 through a connecting pipe 405. When the high-speed flowing wastewater passes through the throat of the venturi tube 202, a negative pressure is generated, which automatically adsorbs the tail gas rich in unused oxygen collected by the gas collecting hood 402 through the connecting pipe 405 and initially mixes it with the wastewater in the venturi tube 202.

[0017] In this embodiment, preferably, a sludge discharge hopper 101 communicating with the vortex mixing chamber 2 is fixedly provided at the bottom end of the tower body 1. The sludge discharge hopper 101 is set in a conical shape. Heavier impurities at the separation point in the vortex mixing chamber 2 and a small amount of iron sludge generated during the reaction process settle and collect here, and are discharged periodically to effectively prevent the tower body 1 from accumulating and clogging. A sludge discharge valve 102 is installed at the bottom of the sludge discharge hopper 101, and a support leg 103 is fixedly provided at the bottom of the sludge discharge hopper 101 to provide stable support for the tower body 1. In this embodiment, preferably, a feed pipe 205 communicating with the vortex mixing chamber 2 is fixedly provided at the bottom of the other side of the tower body 1. A control valve 206 is installed on the surface of the feed pipe 205. The feed pipe 205 is used to quantitatively add solid granular polyferric chloride catalyst to the vortex mixing chamber 2, so that the catalyst is drawn into the vortex. In this embodiment, preferably, baffles 301 fixedly connected to the inner wall of the tower body 1 are provided between adjacent support sieve plates 3. The baffles 301 are circumferentially distributed and inclined, and the inclination directions of adjacent baffles 301 are opposite, which forces the mixture to continuously change direction during the rising process, increases the actual flow path length of the mixture in the reaction zone, prolongs the contact time with the catalyst bed, and the disturbance of the baffles 301 causes the bubbles to break up and renew the gas-liquid interface, improves the mass transfer efficiency, and at the same time causes the catalyst particles to generate slight disturbance in the shallow bed to prevent caking. In this embodiment, preferably, the top of the tower body 1 and the bottom of the top cover 4 are both fixedly provided with mounting plates, and the two mounting plates are fixedly connected by mounting bolts, so that the top cover 4 can be quickly disassembled and assembled. In this embodiment, preferably, a water outlet pipe 401 is fixedly provided in the middle of the top cover 4, and the inner side of the top cover 4 is fixedly connected to the top of the gas collection hood 402 through the mounting base 403, which is used to fix the position of the gas collection hood 402. In this embodiment, preferably, the top of the side of the gas collecting hood 402 is provided with a gas outlet pipe 404, and the bottom of the water outlet pipe 401 is lower than the bottom of the gas outlet pipe 404, so as to prevent liquid in the gas collecting hood 402 from being sucked into the connecting pipe 405 and causing damage to the equipment. In this embodiment, preferably, an air inlet pipe 203 is provided at the throat of the Venturi tube 202. The air inlet pipe 203 is fixedly connected to the air outlet pipe 404 through a connecting pipe 405. The exhaust gas collected by the gas collection hood 402 is rich in unused oxygen and is adsorbed through the connecting pipe 405, and is initially mixed with wastewater in the Venturi tube 202. A one-way valve 204 is provided on the surface of the air inlet pipe 203. The flow direction of the one-way valve 204 is inward, which plays a one-way circulation role to prevent wastewater from entering the air inlet pipe 203.

[0018] In operation, high-pressure wastewater enters the vortex mixing chamber 2 through the tangential inlet pipe 201, forming a high-speed rotating vortex. As the wastewater flows through the throat of the venturi tube 202, negative pressure is generated, automatically drawing in oxygen-rich tail gas collected by the gas collection hood 402 through the connecting pipe 405. The wastewater, oxygen, and supplemented granular polyferric chloride catalyst (added via the feed pipe 205) are initially mixed in the vortex mixing chamber 2. Heavier impurities are thrown towards the wall by the vortex and settle. The mixture rises through the shallow catalyst bed on the supporting sieve plate 3, where contaminants contact the active sites on the catalyst surface. The baffle plates 301 are arranged in an alternating, inclined manner, forcing the fluid to change direction and rise, extending the water flow path, increasing reaction time, breaking up bubbles, and enlarging the gas-liquid interface. Slight disturbance of the catalyst prevents caking; after the reaction, the tail gas rises to the top of the tower and is collected by the gas collecting hood 402, and is reused in the venturi tube 202 via the connecting pipe 405; the treated clean water overflows from the water outlet pipe 401, and the residual gas in the gas collecting hood 402 is discharged through the gas outlet pipe 404. The height of the water outlet pipe 401 is lower than that of the gas outlet pipe 404 to prevent liquid backflow. Iron sludge and separated impurities settle in the conical sludge discharge hopper 101 and are periodically discharged through the sludge discharge valve 102; after the catalyst is consumed, it is quantitatively replenished through the feed pipe 205 and dispersed into the bed by vortex entrainment.

[0019] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A catalytic oxidation reaction tower for polyferric chloride, comprising a tower body (1), characterized in that, The bottom of the tower body (1) is provided with a vortex mixing chamber (2). A tangential water inlet pipe (201) communicating with the vortex mixing chamber (2) is fixedly provided on the bottom of one side of the tower body (1). A Venturi tube (202) is fixedly installed in the middle of the tangential water inlet pipe (201). Multiple support sieve plates (3) are provided inside the tower body (1) above the vortex mixing chamber (2). A layer of granular polyferric chloride catalyst is laid on the surface of the support sieve plate (3) to form a shallow bed. A top cover (4) is fixedly provided at the top of the tower body (1). A gas collecting hood (402) is fixedly provided inside the top cover (4). The gas outlet of the gas collecting hood (402) is connected to the throat of the Venturi tube (202) through a connecting pipe (405).

2. The catalytic oxidation reaction tower for polyferric chloride according to claim 1, characterized in that: The bottom end of the tower body (1) is fixedly provided with a mud discharge hopper (101) communicating with the vortex mixing chamber (2), a mud discharge valve (102) is installed at the bottom of the mud discharge hopper (101), and a support leg (103) is fixedly provided at the bottom of the mud discharge hopper (101).

3. The catalytic oxidation reaction tower for polyferric chloride according to claim 1, characterized in that: The bottom of the other side of the tower body (1) is fixedly provided with a feed pipe (205) that communicates with the vortex mixing chamber (2), and a control valve (206) is installed on the surface of the feed pipe (205).

4. The catalytic oxidation reaction tower for polyferric chloride according to claim 1, characterized in that: A baffle plate (301) is fixedly provided between adjacent support screen plates (3) and is fixedly connected to the inner wall of the tower body (1). The baffle plates (301) are distributed circumferentially and are inclined, and the inclination directions of adjacent baffle plates (301) are opposite.

5. The catalytic oxidation reaction tower for polyferric chloride according to claim 1, characterized in that: The top of the tower body (1) and the bottom of the top cover (4) are both fixedly provided with mounting plates, and the two mounting plates are fixedly connected by mounting bolts.

6. The catalytic oxidation reaction tower for polyferric chloride according to claim 1, characterized in that: A water outlet pipe (401) is fixedly provided in the middle of the top cover (4), and the inner side of the top cover (4) is fixedly connected to the top of the gas collection hood (402) through the mounting base (403).

7. The catalytic oxidation reaction tower for polyferric chloride according to claim 6, characterized in that: The top of the side of the gas collection hood (402) is provided with an air outlet pipe (404), and the bottom of the water outlet pipe (401) is lower than the bottom of the air outlet pipe (404).

8. The catalytic oxidation reaction tower for polyferric chloride according to claim 7, characterized in that: The venturi tube (202) has an air inlet pipe (203) at its throat. The air inlet pipe (203) is fixedly connected to the air outlet pipe (404) through a connecting pipe (405). The surface of the air inlet pipe (203) is provided with a one-way valve (204), and the flow direction of the one-way valve (204) is inward.

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