CN209771799U - Comprehensive recycling system for PVC (polyvinyl chloride) waste alkali and gas burning kiln waste gas - Google Patents
Comprehensive recycling system for PVC (polyvinyl chloride) waste alkali and gas burning kiln waste gas Download PDFInfo
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- CN209771799U CN209771799U CN201920152227.6U CN201920152227U CN209771799U CN 209771799 U CN209771799 U CN 209771799U CN 201920152227 U CN201920152227 U CN 201920152227U CN 209771799 U CN209771799 U CN 209771799U
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Abstract
The utility model provides a comprehensive recycling system of PVC alkali waste and gas burning kiln waste gas. Synthesize recycling system includes circulation groove, waste lye pump, absorption tower, scrubbing tower, the circulation groove passes through the pipeline and is connected with the waste lye pump the absorption tower, the scrubbing tower is connected with gas-fired kiln exhaust gas pipeline be provided with the fan on the gas-fired kiln exhaust gas pipeline, the scrubbing tower passes through the tail gas pipe and connects the absorption tower. The utility model provides a comprehensive recycling system of acetylene waste alkali and gas burning kiln waste gas, with the waste alkali liquid that produces in the acetylene production and the CO in the gas burning kiln tail gas2To carry outReaction for production of Na2CO3And Na to be produced2CO3And recycling the crude brine to a primary brine system of the chlor-alkali industry for impurity removal. The purpose of comprehensive utilization of wastes is achieved, and the influence of the wastes generated in system production on the environment is reduced.
Description
Technical Field
The utility model belongs to the chemical industry field, concretely relates to comprehensive utilization system of acetylene production accessory substance.
Background
in the production process of PVC by calcium carbide method, calcium carbide is mainly used to react with water to prepare acetylene gas, the crude acetylene gas generated by the method contains impurities such as hydrogen sulfide, phosphine and the like, and after the crude acetylene gas is cleaned by sodium hypochlorite, the crude acetylene gas is neutralized by 15% caustic soda solution to remove impurities such as sulfuric acid, phosphoric acid and the like which are mixed in the crude acetylene gas. The concentration of the treated waste alkali liquor is about 9 percent, and the waste alkali liquor is discharged and treated as waste.
The lime gas kiln uses CO generated in the calcium carbide production process as combustion energy, the CO is fully combusted in the gas kiln to generate high temperature, and limestone is decomposed at the high temperature of the gas kiln to generate calcium oxide and CO2，CO2The tail gas of the kiln is directly discharged into the atmosphere after dust removal and purification.
The above treatment process of the prior art results in a large waste of caustic soda. In addition, the temperature of tail gas discharged from the lime kiln is up to 100 ℃, and the tail gas is discharged into the atmosphere, so that the waste heat cannot be fully utilized. The generation of side reactions can also be suppressed by utilizing the high temperature of the exhaust gas.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to burn the waste alkali liquor generated in the acetylene production and CO in the tail gas of the kiln2Reaction for producing Na2CO3And comprehensively utilizes the waste. Based on this, the utility model aims at providing a comprehensive recycling system of PVC alkali waste and gas burning kiln waste gas.
Realize the utility model discloses above-mentioned purpose technical scheme does:
A comprehensive recycling system for waste PVC alkali and waste gas of a gas burning kiln comprises a circulation tank waste alkali liquid pump, an absorption tower and a gas washing tower,
The circulating tank is connected with the absorption tower through a pipeline and a waste alkali liquor pump, the gas washing tower is connected with a gas burning kiln waste gas pipeline, a fan is arranged on the gas burning kiln waste gas pipeline, and the gas washing tower is connected with the absorption tower through a tail gas pipeline.
Wherein the scrubber tower is provided with a liquid phase circulation line. And a circulating pump of the gas washing tower is arranged on the liquid phase circulating pipeline.
Wherein, the scrubbing tower is a packed tower, and the inlet of the liquid phase circulation pipeline is connected with a liquid distributor above the packing (namely, liquid at the bottom of the scrubbing tower is driven by a pump to circulate and is sprayed down from the top of the scrubbing tower through the liquid distributor). Because the tail gas is high in temperature and much in dust, the gas washing tower does not use a common spray nozzle for spraying, but adopts a filler form. The packing used may be the same as the absorber.
Wherein the circulating tank is connected with an acetylene waste alkali pipeline; and the top of the absorption tower is connected with a tail gas guide pipe, and the tail gas guide pipe extends into the circulating groove. The tail gas guide pipe is extended into the circulation tank by about 300-500mm, and does not need to extend below the liquid level.
The absorption tower is a packed tower, PVC filler is filled in the tower, and a liquid distributor is arranged above the filler; the circulation tank is connected to a liquid distributor in the column via a pipeline.
Furthermore, the tower is filled with a plum blossom ring filler with the diameter of 60-80 mm.
Wherein, the scrubbing tower passes through the tail gas pipe connection in the absorption tower, tail gas pipe access connection is in being located the gas distribution pipe of filler below is the region of assembling liquid below the gas distribution pipe, the region of assembling liquid passes through the pipe connection the circulation tank.
Use the utility model discloses a system, a comprehensive retrieval and utilization method of PVC alkali waste and gas burning kiln waste gas, including the step:
1) Starting a waste alkali liquor pump, and forming liquid phase circulation between the waste alkali liquor in the circulation tank and the absorption tower through valve control; and starting a circulating pump of the scrubbing tower to circulate the liquid phase enclosed in the scrubbing tower.
2) The tail gas of the gas burning kiln is pumped into the system by a fan, and the tail gas passes through the gas washing tower to exchange heat with water circulation from top to bottom in the tower, so that the temperature of the tail gas is reduced to below 90 ℃, and dust mixed with the tail gas is removed.
3) The tail gas after being cooled from the gas washing tower enters an absorption tower and reacts with the waste alkali in the tower to produce Na2CO3。
4) And tail gas is discharged from an outlet at the top of the absorption tower and is introduced into the circulation tank through the guide pipe, so that the liquid in the circulation tank is prevented from being blown to the atmosphere by overlarge air volume of the tail gas.
Wherein, a tank car or a pipeline is used for conveying the waste alkali liquid generated by the acetylene cleaning process to a reaction site, a unloading tank is used for automatically flowing the waste alkali into the unloading tank when the tank car transports the waste alkali, and the alkali liquid in the unloading tank is pumped into a circulating tank for standby; when the waste alkali is conveyed by a pipeline, the waste alkali is directly pumped into a circulating tank for standby.
Wherein the fan is provided with a vent outlet, and the pressure of the system is adjusted to be 30-50kPa by utilizing a valve on the vent outlet.
The waste lye pump can be used in multiple functions, because the system is started intermittently, the pump can be used as a finished product pump for loading and unloading, and can be used as a circulating pump for driving waste liquor during reaction.
in the absorption operation, the pump flow is constant, and the larger the air volume is, the better the absorption effect is. A preferred ratio is proposed here: in the step 3), the volume ratio of the pump flow to the fan air volume is 1: (110-130).
For example, the pump flow rate is 25m3the air volume of the fan is controlled to be 2750-3250 m3/h。
preferably, the step of3) in the reaction, as the reaction time is prolonged, the NaOH concentration in the waste alkali is reduced, and Na is formed2CO3The concentration gradually increases; the reaction was considered complete when the NaOH concentration in the spent caustic dropped below 1%. Na in the tank will be circulated2CO3The solution is conveyed to primary brine for impurity removal.
Further, the tail gas is discharged from an outlet at the top of the absorption tower and is introduced into the circulating tank through a guide pipe.
The beneficial effects of the utility model reside in that:
The utility model provides a comprehensive recycling system of acetylene waste alkali and gas-fired kiln waste gas in PVC production, with the waste alkali liquid that acetylene purification technology produced and the CO in the gas-fired kiln tail gas2Reaction for producing Na2CO3And Na to be produced2CO3And recycling the crude brine to a primary brine system of the chlor-alkali industry for impurity removal. The purpose of comprehensive utilization of wastes is achieved, and the influence of the wastes generated in system production on the environment is reduced.
Drawings
FIG. 1 is a schematic view of the comprehensive recycling system for waste PVC alkali and waste gas from gas burning kiln.
In the figures, the parts and numbering correspond to:
The device comprises a circulating tank 1, a waste alkali liquor pump 2, an unloading tank 3, an absorption tower 4, a gas distribution pipe 5, a gas washing tower circulating pump 6, a gas washing tower 7, an emptying outlet 8, a tail gas guide pipe 9 and a fan 10.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention.
The means employed in the detailed description are, unless otherwise specified, all technical means which are conventional in the art.
Examples 1,
Referring to fig. 1, a comprehensive recycling system for PVC waste alkali and gas burning kiln waste gas comprises a circulating tank 1, a waste alkali liquor pump 2, an absorption tower 4 and a gas washing tower 7,
The circulating tank 1 is connected with the absorption tower 4 through a pipeline and a waste alkali liquor pump 2, the gas washing tower is connected with a waste gas pipeline of the gas burning kiln, a fan 10 is arranged on the waste gas pipeline of the gas burning kiln, an emptying outlet 8 is arranged on the fan, and the outlet of the fan utilizes a hand valve to discharge and regulate the pressure of the system.
the gas washing tower 7 is connected with the absorption tower 4 through a tail gas pipeline.
Further, the gas washing tower is provided with a liquid phase circulation pipeline, and a gas washing tower circulation pump 6 is arranged on the liquid phase circulation pipeline. The gas washing tower is a packed tower, and the inlet of the liquid phase circulation pipeline is connected with a liquid distributor above the packing. The filler is a phi 75mm plum blossom ring made of PVC.
The circulation tank is connected with an acetylene waste alkali pipeline; the top of the absorption tower is connected with a tail gas guide pipe 9, the tail gas guide pipe 9 extends into the circulation groove 1, and the tail gas guide pipe extends into the circulation groove by about 300 mm.
The absorption tower 4 is a packed tower filled with a phi 75mm plum blossom ring packing made of PVC material, and a liquid distributor is arranged above the packing; the circulation tank 1 is connected to a liquid distributor in the column through a pipeline,
The scrubbing tower 7 is connected to in the absorption tower 4 through the tail gas pipeline, and tail gas pipeline access connection is in the gas distribution pipe 5 that is located the filler below, and 5 pipe below in gas distribution are the region of assembling liquid, assemble the regional pipe connection that passes through of liquid the circulation groove.
Only one circulation tank can be used in one integrated recycling system, and the system of the embodiment adopts two tanks (1 # and 2# in the figure) which are mutually standby, so that the storage capacity is larger. In this embodiment, the circulation tank is connected to the unloading tank 3, and the alkali liquor in the unloading tank 3 is pumped into the circulation tank for standby by the waste alkali liquor pump.
When the PVC waste alkali and the waste gas of the gas burning kiln are comprehensively recycled, the waste alkali liquor generated by the acetylene cleaning process is sent to a reaction site by using a tank car or a pipeline, the waste alkali is automatically flowed into an unloading tank by using an unloading tank when the tank car transports the waste alkali, and the alkali liquor in the unloading tank is pumped into a circulating tank for later use by a pump; when the waste alkali is conveyed by a pipeline, the waste alkali is directly pumped into a circulating tank for standby.
The method for comprehensively recycling the acetylene waste alkali and the waste gas of the gas burning kiln by using the system of the embodiment 1 comprises the following steps:
1) Starting the waste alkali liquid pump 2, and forming liquid phase circulation between the waste alkali liquid in the circulation tank and the absorption tower through valve control; and starting a circulating pump 6 of the gas washing tower to circulate the liquid phase sealed in the gas washing tower.
2) the tail gas (about 100 ℃) of the gas burning kiln is pumped into a system by a fan, the pressure of the system is adjusted by discharging through a hand valve at the outlet of the fan, the pressure is controlled to be 30-50kPa, the tail gas firstly passes through a gas washing tower and exchanges heat with water circulation from top to bottom in the tower, the temperature of the tail gas is reduced to be below 90 ℃, and dust mixed with the tail gas is removed.
3) The tail gas after being cooled from the gas washing tower enters an absorption tower and reacts with the waste alkali in the tower to produce Na2CO3. Control pump flow 25m3H, the air volume of the fan is 3000m3/h。
4) and tail gas is discharged from an outlet at the top of the absorption tower and is introduced into the circulation tank through the guide pipe, so that the liquid in the circulation tank is prevented from being blown to the atmosphere by overlarge air volume of the tail gas.
In the step 3), as the reaction time is prolonged, the concentration of NaOH in the waste alkali is reduced, and the generated Na2CO3The concentration gradually increases; the concentration of the base in the solution was determined by the double base method. When the NaOH concentration in the waste alkali is reduced to below 1%, the reaction is considered to be complete, and Na in the circulating tank 1 is controlled by a valve through a No. 2 pump2CO3Loading the solution into a truck and transporting the solution to primary brine for impurity removal.
By adopting the method, the yield of Na can be reduced for a PVC production device producing 30 ten thousand tons every year2CO3About 2000 tons/year; the yield is increased by about 400 ten thousand yuan.
The above embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (7)
1. A comprehensive recycling system of PVC waste alkali and gas burning kiln waste gas is characterized by comprising a circulating tank, a waste alkali liquid pump, an absorption tower and a gas washing tower,
The circulating tank is connected with the absorption tower through a pipeline and a waste alkali liquor pump, the gas washing tower is connected with a gas burning kiln waste gas pipeline, a fan is arranged on the gas burning kiln waste gas pipeline, and the gas washing tower is connected with the absorption tower through a tail gas pipeline.
2. The comprehensive recycling system of PVC waste alkali and gas burning kiln waste gas as recited in claim 1, wherein the gas scrubber is provided with a liquid phase circulation pipeline, and a gas scrubber circulation pump is arranged on the liquid phase circulation pipeline.
3. The comprehensive recycling system of PVC waste alkali and gas burning kiln waste gas as recited in claim 2, wherein the scrubber tower is a packed tower, and the inlet of the liquid phase circulation pipeline is connected to the liquid distributor above the packing.
4. The comprehensive recycling system of PVC waste alkali and gas burning kiln waste gas as recited in claim 1, wherein the circulation tank is connected with an acetylene waste alkali pipeline; the top of the absorption tower is connected with a tail gas guide pipe, and the tail gas guide pipe extends into the circulating groove.
5. The comprehensive recycling system of PVC waste alkali and gas burning kiln waste gas as recited in any one of claims 1 to 4, wherein the absorption tower is a packed tower filled with PVC filler, and a liquid distributor is arranged above the filler; the circulation tank is connected to a liquid distributor in the column via a pipeline.
6. The comprehensive recycling system of PVC waste alkali and gas burning kiln waste gas as recited in claim 5, wherein the tower is filled with a plum blossom ring packing with a diameter of 60-80 mm.
7. The comprehensive recycling system of PVC waste alkali and gas burning kiln waste gas as recited in claim 5, wherein said scrubber tower is connected to the inside of said absorption tower through a tail gas pipe, the inlet of said tail gas pipe is connected to a gas distribution pipe located under said filler, a liquid gathering region is located under said gas distribution pipe, and said liquid gathering region is connected to said circulation tank through a pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920152227.6U CN209771799U (en) | 2019-01-25 | 2019-01-25 | Comprehensive recycling system for PVC (polyvinyl chloride) waste alkali and gas burning kiln waste gas |
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| CN201920152227.6U CN209771799U (en) | 2019-01-25 | 2019-01-25 | Comprehensive recycling system for PVC (polyvinyl chloride) waste alkali and gas burning kiln waste gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647167A (en) * | 2019-01-25 | 2019-04-19 | 内蒙古乌海化工有限公司 | A kind of comprehensive recycling system and method for PVC salkali waste and gas burning kiln exhaust gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109647167A (en) * | 2019-01-25 | 2019-04-19 | 内蒙古乌海化工有限公司 | A kind of comprehensive recycling system and method for PVC salkali waste and gas burning kiln exhaust gas |
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