Flue gas treatment system for solid waste melting furnace

Abstract

The utility model relates to the field of solid waste melting recovery treatment, and provides a flue gas treatment system for a solid waste melting furnace. Comprising a washing tower and more than one stage of absorption tower, the washing tower comprises a tower body, washing liquid is contained in the washing tower, a pulse spraying layer and an absorption spraying layer are arranged in the washing tower, the pulse spraying layer is located below the liquid level, the absorption spraying layer is located above the liquid level, a demisting device is arranged on the upper portion in the tower body, and a demister is arranged on the lower portion in the tower body. And the demisting device is positioned between the absorption spraying layer and the gas outlet pipe. And the flue gas is continuously sprayed and absorbed through the multiple absorption spraying layers, so that the absorption effect is ensured. Through the arrangement of the demister, the broken line channel of the demister and the two spraying devices above and below the demister, the absorption time of flue gas in the tower body can be prolonged, and particulate matters in the flue gas are fully intercepted in a bidirectional hedging manner; and a spraying device and a demisting device are also arranged in the absorption tower, so that the flue gas is fully treated and absorbed and reaches the emission standard.

Description

Technical Field

[0001] The utility model relates to the field of solid waste melting and recycling treatment, and particularly relates to a flue gas treatment system for a solid waste melting furnace. Background Art

[0002] Solid waste containing metals is generally treated by melting. By adding a catalyst, the metals in the solid waste are melted and finally recovered and further purified. Equipment such as an oxygen-enriched side-blown melting furnace is generally used for solid waste melting treatment. During the solid waste melting treatment process, a large amount of flue gas is generated. The flue gas contains acidic substances, organic substances, and dust after incineration. The flue gas needs to be washed with an alkali solution and absorbed through multiple processes before it can meet the emission standards and be discharged into the atmosphere.

[0003] Since there are many particulate matters in the flue gas and the temperature of the flue gas is relatively high, during the washing and absorption process of the flue gas, the particulate matters quickly rise with the flue gas, resulting in some flue gas not being treated in time. The particulate matters in the flue gas enter the next process with the flue gas and cause problems such as pipeline blockage in the next process. Summary of the Invention

[0004] In order to fully absorb and treat the flue gas generated during the solid waste melting treatment process, the utility model provides a flue gas treatment system for a solid waste melting furnace.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A flue gas treatment system for a solid waste melting furnace includes a washing tower and at least one absorption tower. The washing tower includes a tower body. A flue connection pipe is provided in the middle of the tower body. The flue connection pipe is connected to a flue. An air outlet pipe is provided at the top of the tower body. The air outlet pipe is connected to the absorption tower through a pipeline. A washing liquid is contained in the washing tower. The liquid level of the washing liquid is lower than the flue connection pipe. A pulse spraying layer and an absorption spraying layer are provided in the washing tower. The pulse spraying layer is located below the liquid level. The absorption spraying layer is located above the liquid level. The pulse spraying layer includes a pulse spraying device facing the tower bottom and a pulse pump. The input end of the pulse pump is connected to the bottom of the washing tower. The output end of the pulse pump is connected to the pulse spraying device. The absorption spraying layer includes a washing spraying device facing the tower bottom and a circulation pump. The input end of the circulation pump is connected to the bottom of the washing tower. The output end of the circulation pump is connected to the washing spraying device. A demisting device is provided in the upper part of the tower body. The demisting device is located between the absorption spraying layer and the air outlet pipe. The demisting device includes a demister and two flushing components. The two flushing components are distributed on the upper and lower sides of the demister. The two flushing components respectively face the demister.

[0007] Further, it includes two absorption towers arranged in series. An air inlet is provided in the middle of the absorption tower, and an air outlet is provided at the top of the absorption tower. An absorption spray layer and a demisting device are successively installed from bottom to top between the air inlet and the air outlet in the absorption tower.

[0008] Further, the flushing assembly includes a flushing pump and a flushing spray device, and the input end of the flushing pump is connected to the process water tank.

[0009] Further, the washing spray device, the pulse spray device and the flushing spray device have the same structure, including a support ring plate. The support ring plate is cooperatively installed with the support structure in the tower body. A main pipe is fixedly supported on the support ring plate. The main pipe passes through the center of the support ring plate. A plurality of secondary pipes are installed on the main pipe. The main pipe is communicated with each secondary pipe. Both ends of each secondary pipe are closed and fixedly supported on the support ring plate. A plurality of nozzles are equidistantly installed on each secondary pipe.

[0010] Further, a plurality of branch pipes communicated with it are symmetrically installed on both sides of each secondary pipe, and nozzles are respectively installed on each branch pipe.

[0011] Further, the demister includes a circular frame, and a dense folding plate is installed in the circular frame, and a folded line channel is formed between adjacent folding plates.

[0012] Further, the bottom of the tower body is connected to a sump through a pipeline and a valve.

[0013] Still further, an alkali solution replenishing device is connected to the side of the tower body. The alkali solution replenishing device includes an alkali solution pump and an alkali solution tank.

[0014] After adopting the above technical solutions, the beneficial effects of the present utility model are as follows:

[0015] A pulse spray layer and an absorption spray layer are arranged in the washing tower. The alkali solution at the bottom of the tower body is continuously impacted and mixed by the pulse spray layer, so that the concentration of the alkali solution is uniform. Especially in the case of using lime powder as the raw material of the alkali solution, it is ensured that the alkali solution can fully absorb the acidic gas in the flue gas; the flue gas is continuously sprayed and absorbed by the multi-layer absorption spray layer to ensure the absorption effect. By setting a demister, using the folded line channel of the demister and the two spray devices above and below the demister, the absorption time of the flue gas in the tower body can be increased, and the particulate matter in the flue gas can be fully intercepted by the two-way counter-flushing method; spray and demisting devices are also arranged in the absorption tower to ensure that the flue gas is fully treated and absorbed to meet the emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present utility model.

[0017] Figure 2It is a schematic structural diagram of a spray device.

[0018] In the figure: scrubbing tower 1, absorption tower 2, flue gas connecting pipe 3, lye 4, pulse spray layer 5, absorption spray layer 6, pulse pump 7, circulation pump 8, demister 9, flushing assembly 10, gas outlet pipe 11, support ring plate 12, main pipe 13, secondary pipe 14, branch pipe 15, nozzle 16, sump 17, lye pump 18, lye tank 19. Specific embodiments

[0019] The following further details the specific embodiments of the present utility model in conjunction with the accompanying drawings:

[0020] As Figure 1 shown, a solid waste melting furnace flue gas treatment system includes a scrubbing tower 1 and two-stage absorption tower 2, and is used to treat the high-temperature particulate-containing flue gas generated in the solid waste melting furnace.

[0021] The scrubbing tower 1 includes a tower body. A flue gas connecting pipe 3 is provided in the middle of the tower body. The flue gas connecting pipe 3 is inclined downward and is connected to the flue of the melting furnace. The flue gas in the furnace is sent into the tower body through an induced draft fan. At the bottom of the tower body, lye 4 is installed, and lime water can be selected. The liquid level of the lye 4 is lower than the flue gas connecting pipe 3. Multiple pulse spray layers 5 and multiple absorption spray layers 6 are provided in the tower body. The pulse spray layer 5 is located below the liquid level of the lye 4, and the absorption spray layer 6 is located above the liquid level of the lye 4 and the flue gas connecting pipe 3. The pulse spray layer 5 includes a pulse spray device facing the tower bottom and a pulse pump 7. The pulse pump 7 extracts lye from the bottom of the scrubbing tower and sends it into the pulse spray device to spray towards the tower bottom, fully stirring the lye at the tower bottom to ensure uniform concentration of the lye. The absorption spray layer 6 includes a washing spray device facing the tower bottom and a circulation pump 8. The circulation pump 8 extracts lye from the bottom of the scrubbing tower and sends it into the washing spray device to spray downward. Through multiple sprays, the flue gas is washed.

[0022] An atomizing device is provided in the upper part of the tower body. The atomizing device is located between the absorption spray layer and the gas outlet pipe. The atomizing device includes a demister 9 and two flushing assemblies 10. The flushing assembly 10 includes a flushing pump and a flushing spray device. The flushing pump sprays water in the process water tank towards the demister 9 through the flushing spray device. The two flushing assemblies 10 are distributed on the upper and lower sides of the demister 9, and the two flushing assemblies spray towards the demister 9 respectively. The demister 9 includes a circular frame, and a dense corrugated plate is installed in the circular frame. A folded line channel is formed between adjacent corrugated plates. The setting of the demister 9 can block the direct rise of the flue gas. The flue gas continuously collides with the corrugated plates during the rising process. The water vapor and particulate matter in the flue gas are blocked by the corrugated plates and are washed by the two flushing assemblies and then flow to the tower bottom along with the flushing water flow.

[0023] An air outlet pipe 11 is provided at the top of the tower body, and the air outlet pipe 11 is connected to the absorption tower 2 through a pipeline; in this technical solution, two absorption towers 2 arranged in series are provided. An air inlet is provided in the middle of the absorption tower 2, an air outlet is provided at the top of the absorption tower, and an absorption liquid is also installed at the bottom of the absorption tower. An absorption spray layer and a demisting device are sequentially installed from bottom to top between the air inlet and the air outlet in the absorption tower.

[0024] As Figure 2 shown, the structures of the washing spray device, the pulse spray device, and the flushing spray device in this technical solution are the same, including a support ring plate 12. The support ring plate 12 is installed in cooperation with the support structure in the tower body. A main pipeline 13 is fixedly supported on the support ring plate 12. The main pipeline 13 passes through the center of the support ring plate 12. A plurality of secondary pipelines 14 are installed on the main pipeline 13. The main pipeline 13 is communicated with each secondary pipeline 14. The two ends of each secondary pipeline 14 are closed and fixedly supported on the support ring plate 12. A plurality of branch pipelines 15 communicated with it are symmetrically installed on both sides of each secondary pipeline 13, and nozzles 16 are respectively installed on each branch pipeline 15.

[0025] A collecting pool 17 is connected at the bottom of the tower body through a pipeline and a valve. An overflow port is provided on the side of the tower body, and the overflow port is located below the flue connecting pipe. When the liquid level in the tower body is too high, it overflows to the collecting pool through the overflow port to avoid backflow into the furnace. An alkali liquid replenishing device is connected to the side of the tower body. The alkali liquid replenishing device includes an alkali liquid pump 18 and an alkali liquid tank 19 for replenishing the alkali liquid at the bottom of the tower.

Claims

1. A solid waste melting furnace flue gas treatment system, comprising a washing tower and an absorption tower at one level or above, wherein the washing tower comprises a tower body, a flue connecting pipe is provided in the middle of the tower body, the flue connecting pipe is connected to the flue, an air outlet pipe is provided on the top of the tower body, and the air outlet pipe is connected to the absorption tower through a pipeline; characterized in that: The washing tower is filled with washing liquid, and the liquid level of the washing liquid is lower than the flue connecting pipe. A pulse spray layer and an absorption spray layer are provided in the washing tower. The pulse spray layer is located below the liquid level, and the absorption spray layer is located above the liquid level. The pulse spray layer includes a pulse spray device and a pulse pump facing the bottom of the tower. The input end of the pulse pump is connected to the bottom of the washing tower, and the output end of the pulse pump is connected to the pulse spray device; the absorption spray layer includes a washing spray device and a circulating pump facing the bottom of the tower. The input end of the circulating pump is connected to the bottom of the washing tower, and the output end of the circulating pump is connected to the washing spray device; a defogger is provided at the upper part of the tower body, and the defogger is located between the absorption spray layer and the outlet pipe. The defogger includes a defogger and two flushing components. The two flushing components are distributed on the upper and lower sides of the defogger, and the two flushing components face the defogger respectively.

2. A solid waste melting furnace flue gas treatment system according to claim 1, characterized in that: The invention comprises two absorption towers arranged in series, wherein an air inlet is arranged in the middle of the absorption tower, an air outlet is arranged at the top of the absorption tower, and an absorption spray layer and a demisting device are sequentially installed from bottom to top in the absorption tower between the air inlet and the air outlet.

3. A solid waste melting furnace flue gas treatment system according to claim 2, characterized in that: The flushing assembly comprises a flushing pump and a flushing spray device, and the input end of the flushing pump is connected to a process water tank.

4. A solid waste melting furnace flue gas treatment system according to claim 3, characterized in that: The washing spray device, pulse spray device and flushing spray device have the same structure, including a support ring plate, which is installed in cooperation with the support structure in the tower body. A main pipeline is fixedly supported on the support ring plate, and the main pipeline passes through the center of the support ring plate. A plurality of secondary pipelines are installed on the main pipeline, and the main pipeline is connected to each secondary pipeline. Both ends of each secondary pipeline are closed and fixedly supported on the support ring plate, and a plurality of nozzles are installed on each secondary pipeline at equal intervals.

5. A solid waste melting furnace flue gas treatment system according to claim 4, characterized in that: A plurality of branch pipes connected thereto are symmetrically installed on both sides of each of the secondary pipes, and a nozzle is installed on each of the branch pipes.

6. A solid waste melting furnace flue gas treatment system according to claim 1, characterized in that: The demister comprises a circular frame, in which densely distributed folding plates are installed, and folding line channels are formed between adjacent folding plates.

7. A solid waste melting furnace flue gas treatment system according to claim 1, characterized in that: The bottom of the tower body is connected with a water collecting tank through a pipeline and a valve.

8. A solid waste melting furnace flue gas treatment system according to claim 7, characterized in that: A alkali solution replenishing device is connected to the side of the tower body, and the alkali solution replenishing device includes a alkali solution pump and a alkali solution tank.

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