CN110331003B - Recovery method of waste cleaning liquid for preparing acetylene by wet method - Google Patents
Recovery method of waste cleaning liquid for preparing acetylene by wet method Download PDFInfo
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- CN110331003B CN110331003B CN201910540882.3A CN201910540882A CN110331003B CN 110331003 B CN110331003 B CN 110331003B CN 201910540882 A CN201910540882 A CN 201910540882A CN 110331003 B CN110331003 B CN 110331003B
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- waste
- cleaning
- cleaning liquid
- liquid
- acetylene
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10H—PRODUCTION OF ACETYLENE BY WET METHODS
- C10H21/00—Details of acetylene generators; Accessory equipment for, or features of, the wet production of acetylene
Abstract
The invention provides a method for recovering a waste cleaning liquid in acetylene preparation by a wet method. The recovery method of the waste cleaning liquid for preparing acetylene by the wet method comprises the following steps of utilizing the waste cleaning liquid for three times; the third utilization of the waste cleaning liquid is to reuse the waste cleaning liquid on the basis of the secondary utilization of the waste cleaning liquid, namely the waste cleaning liquid entering the cooling tower and the waste water of the cooling tower and the water washing tower enter a waste water storage tank and are pumped into an acetylene generator through a waste water II pump to be used as reaction liquid. The waste cleaning liquid of the cooling tower and the waste water in the cooling tower and the water washing tower enter the waste water storage tank and then are sent into the acetylene generator to be used as reaction liquid, and no waste liquid is discharged and completely recycled, so that the water is saved, the waste discharge treatment of the waste cleaning liquid is avoided, the cost of sewage treatment and the production cost of preparing acetylene gas by a wet method are reduced, the sewage is recycled, and the zero discharge, safety and environmental protection of the waste cleaning liquid are realized. The method is suitable for recycling and applying the waste cleaning liquid in the wet acetylene preparation.
Description
Technical Field
The invention relates to a wet method for preparing acetylene gas, in particular to recycling of waste cleaning liquid in the wet method for preparing acetylene gas.
Background
At present, acetylene is produced by adopting a calcium carbide method in China. The production of acetylene can be divided into the wet method acetylene by calcium carbide and the dry method acetylene by water-in-calcium carbide according to the contact classification of calcium carbide and water. Generally, acetylene is mostly prepared by a calcium carbide-water wet method in China. From the viewpoint of saving energy, reducing pollution and being beneficial to safety management, the dry method for preparing acetylene has high temperature requirement, harsh granularity, much generated dust, environmental pollution, resource waste and immature production technology. The dry method in China has higher danger coefficient of acetylene, so the method is not adopted. Compared with the dry method, the wet method acetylene preparation technology is mature, and the wet method acetylene preparation technology is superior to the dry method in terms of environmental protection, energy conservation and safety factor, and can also change waste into valuable. The calcium hydroxide product of the reaction can be used for manufacturing cement in cement plants, and the produced ferrosilicon can also create certain economic benefit, so that large-scale domestic plants are interested in preparing acetylene by a wet method.
At present, the technology for preparing acetylene by a wet method is mature, but the problems of high cost of treatment of the waste cleaning liquid, improper treatment and even environmental pollution are still faced in the aspects of utilization of the waste cleaning liquid and production water. As is well known, the water requirement for preparing acetylene by a wet method is large, and the water requirement is also an important part influencing the cost. Therefore, from the aspects of wastewater discharge treatment, production cost reduction and the like, new technologies still need to be continuously found, and the technical requirement of zero discharge of waste liquid is finally met.
Disclosure of Invention
In order to solve the problem of recycling the waste cleaning liquid in the wet acetylene preparation and realize zero discharge of waste liquid, the invention provides a method for recycling the waste cleaning liquid in the wet acetylene preparation. The method is characterized in that the waste cleaning liquid is applied for the third time after being applied twice in the prior art, namely the waste cleaning liquid in the cooling tower and the waste water in the cooling tower and the water washing tower enter a waste water storage tank and then are sent into an acetylene generator to be used as reaction liquid, no waste liquid is discharged and completely recovered, so that water is saved, the waste cleaning liquid is prevented from being discharged and treated, the zero discharge of the waste cleaning liquid is realized, and the technical problem of the recovery of the waste cleaning liquid in the wet method for preparing acetylene is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the recovery method of the waste cleaning liquid for preparing acetylene by the wet method comprises the following steps of utilizing the waste cleaning liquid for three times;
the first utilization of the waste cleaning liquid means that qualified sodium hypochlorite solution is prepared by water alkali and chlorine according to a proportion through a Venturi reactor and enters a sodium hypochlorite storage tank, the solution in the sodium hypochlorite storage tank is pumped to a sodium hypochlorite elevated tank through a replenishing pump, finally the sodium hypochlorite elevated tank is pumped into a cleaning II tower through a cleaning II pump, acetylene gas is subjected to cleaning reaction of the cleaning II tower and then subjected to first impurity removal, and after the cleaning of the acetylene gas is finished, the waste liquid is pumped into a cleaning I tower through a cleaning I pump;
the second utilization of the waste cleaning liquid means that after acetylene gas is subjected to cleaning reaction in the cleaning tower I, the acetylene gas enters the cleaning tower II for second cleaning and impurity removal, and the waste liquid is pumped into the cooling tower through the waste water I pump;
the third utilization of the waste cleaning liquid is to reuse the waste cleaning liquid on the basis of the secondary utilization of the waste cleaning liquid, namely the waste cleaning liquid entering the cooling tower and the waste water of the cooling tower and the water washing tower enter a waste water storage tank and are pumped into an acetylene generator through a waste water II pump to be used as reaction liquid.
The method has the advantages that the waste cleaning liquid of the cooling tower and the waste water in the cooling tower and the water washing tower enter the waste water storage tank and are sent into the acetylene generator to be used as reaction liquid, no waste liquid is discharged and completely recycled, the purity of acetylene gas generated by reaction and the cleaning effect of the acetylene gas are not influenced, the use amount of the cleaning liquid is reduced, and the production water is reduced, so that the water is saved, the waste discharge treatment of the waste cleaning liquid is avoided, the cost of sewage treatment and the production cost of wet-method acetylene gas preparation are reduced, the sewage is recycled, and the zero discharge of the waste cleaning liquid is realized. The method is suitable for recycling and applying the waste cleaning liquid in the wet acetylene preparation.
Drawings
FIG. 1 is a process flow diagram of a cleaning solution;
FIG. 2 is a process flow diagram of the spent cleaning solution.
In the figure, 1, a Venturi reactor, 2, a sodium hypochlorite storage tank, 3, a supply pump, 4, a sodium hypochlorite elevated tank, 5, a cleaning II pump, 6, a cleaning II tower, 7, a cleaning I pump, 8, a cleaning I tower, 9, a wastewater I pump, 10, a cooling tower, 11, a water washing tower, 12, a wastewater storage tank and 13, a wastewater II pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the figure, the recovery method of the waste cleaning liquid for preparing acetylene by the wet method comprises the three-time utilization of the waste cleaning liquid.
The first utilization of the waste cleaning liquid means that qualified sodium hypochlorite solution is prepared by water alkali and chlorine according to a proportion through a Venturi reactor 1 and enters a sodium hypochlorite storage tank 2, the solution in the sodium hypochlorite storage tank 2 is pumped to a sodium hypochlorite elevated tank 4 through a replenishing pump 3, finally the sodium hypochlorite solution is pumped into a cleaning II tower 6 through a cleaning II pump 5, acetylene gas is subjected to cleaning reaction of the cleaning II tower 6 and then is subjected to first impurity removal, and after the cleaning of the acetylene gas is finished, the waste liquid is pumped into a cleaning I tower 8 through a cleaning I pump 7.
The second utilization of the waste cleaning liquid means that after acetylene gas is subjected to cleaning reaction in the cleaning I tower 8, the acetylene gas enters the cleaning II tower 6 for second cleaning and impurity removal, and the waste liquid is pumped into the cooling tower 10 through the waste water I pump 9.
The third utilization of the waste cleaning liquid is to reuse the waste cleaning liquid on the basis of the secondary utilization of the waste cleaning liquid, and means that the waste cleaning liquid entering the cooling tower 10 and the waste water entering the cooling tower 10 and the water washing tower 11 enter the waste water storage tank 12 and are pumped into the acetylene generator through the waste water II pump 13 to be used as the reaction liquid.
The working process of the invention is as follows:
qualified sodium hypochlorite solution is prepared by the water alkali chlorine according to a proportion through the Venturi reactor and enters a sodium hypochlorite storage tank, the solution in the storage tank is pumped to a sodium hypochlorite elevated tank through a supply pump, and finally the sodium hypochlorite elevated tank is pumped into a cleaning II tower through a cleaning II pump, after acetylene gas is subjected to cleaning reaction of the cleaning II tower, the content of sodium hypochlorite in waste liquid is reduced, and after the second impurity removal of the acetylene gas is finished, the acetylene gas is qualified and can be normally supplied to a vinyl chloride workshop for use. The waste liquid is pumped into a cleaning tower I by a cleaning pump I.
After acetylene gas is subjected to the cleaning reaction of the cleaning tower I, the content of sodium hypochlorite is reduced again, after the first cleaning and impurity removal of the acetylene gas are finished, the acetylene gas enters the cleaning tower II to be further cleaned and impurity removed, and the waste liquid is pumped into the cooling tower through the waste water pump I.
The waste cleaning liquid entering the cooling tower and the waste water of the cooling tower and the water washing tower enter a waste water storage tank and are pumped into an acetylene generator through a waste water II pump to be used as reaction liquid.
The principle of the invention is as follows:
the first utilization of the waste cleaning liquid means that the cleaning liquid enters a cleaning II tower, and the waste liquid of the acetylene gas enters a cleaning I tower after the acetylene gas is subjected to cleaning reaction in the cleaning II tower; the second utilization of the waste cleaning liquid means that acetylene gas enters a cooling tower after the acetylene gas is subjected to a cleaning reaction in a cleaning I tower; the third utilization of waste cleaning liquid means that the waste cleaning liquid in the cooling tower and the waste water in the cooling tower and the water washing tower enter the waste water storage tank and are sent into the generator to be used as reaction liquid, so that the zero discharge of waste liquid is realized.
The cleaning liquid is selected not to react with acetylene gas or water, and is added into a generator as reaction liquid after being mutually dissolved with water, so that other gases are not generated, and the generation of side reactants is not increased. The cleaning solution is sodium hypochlorite.
The invention has the advantages that:
on the basis of continuing the traditional two-time utilization of the waste cleaning liquid, the invention innovatively invents the third utilization of the waste cleaning liquid, and the waste cleaning liquid and the waste water are added into the acetylene generator together to be used as reaction liquid, thereby saving water and avoiding the pollution discharge treatment of the waste cleaning liquid; in the traditional method, after the waste cleaning solution is utilized twice, the waste cleaning solution is directly discharged to be treated as sewage without being utilized for the third time.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (1)
1. The recovery method of the acetylene waste cleaning liquid by a wet method comprises the three-time utilization of the waste cleaning liquid;
the first utilization of the waste cleaning liquid is that qualified sodium hypochlorite solution is prepared by water alkali and chlorine according to a proportion through a Venturi reactor (1) and enters a sodium hypochlorite storage tank (2), the solution in the sodium hypochlorite storage tank (2) is pumped to a sodium hypochlorite elevated tank (4) through a supply pump (3), finally the sodium hypochlorite solution is pumped into a cleaning II tower (6) through a cleaning II pump (5), acetylene gas is subjected to cleaning reaction of the cleaning II tower (6) and then is subjected to first impurity removal, and after the cleaning of the acetylene gas is finished, the waste liquid is pumped into a cleaning I tower (8) through a cleaning I pump (7);
the second utilization of the waste cleaning liquid means that after acetylene gas is subjected to cleaning reaction in a cleaning I tower (8), the acetylene gas enters a cleaning II tower (6) for second cleaning and impurity removal, and waste liquid is pumped into a cooling tower (10) through a waste water I pump (9);
the method is characterized in that:
the third utilization of the waste cleaning liquid is to reuse the waste cleaning liquid on the basis of the secondary utilization of the waste cleaning liquid, and means that the waste cleaning liquid entering the cooling tower (10) and the waste water of the cooling tower (10) and the water washing tower (11) enter a waste water storage tank (12) and are pumped into an acetylene generator through a waste water II pump (13) to be used as reaction liquid.
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| CN201910540882.3A CN110331003B (en) | 2019-06-21 | 2019-06-21 | Recovery method of waste cleaning liquid for preparing acetylene by wet method |
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| CA2627962C (en) * | 2005-11-07 | 2013-01-29 | Specialist Process Technologies Limited | Functional fluid and a process for the preparation of the functional fluid |
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Effective date of registration: 20220216 Address after: 125000 office building, building 1-113, chemical Street, Lianshan District, Huludao City, Liaoning Province Patentee after: Hangjin Jinxi Chlor Alkali Chemical Co.,Ltd. Address before: No. 1, Lianshan chemical Street, Huludao, Liaoning Province Patentee before: HANGJIN TECHNOLOGY CO.,LTD. |