Device for effectively controlling pH value and available chlorine of sodium hypochlorite waste liquid

Abstract

The utility model belongs to the technical field of comprehensive utilization of waste water, and particularly discloses a device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid, which comprises a sodium hypochlorite waste liquid buffer tank, an inlet of the sodium hypochlorite waste liquid buffer tank is communicated with a washing component, and an outlet of the sodium hypochlorite waste liquid buffer tank is communicated with a waste liquid treatment component. The utility model provides a device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid, and by controlling the pH value of the sodium hypochlorite waste liquid, the scaling and blockage of a pipeline in the material conveying process from a waste sodium hypochlorite buffer tank to a degassing tower can be effectively relieved, the scaling and blockage of a waste sodium hypochlorite heater can be relieved, and the service cycle of a matched device can be prolonged; meanwhile, the sodium hypochlorite waste liquid treated by the washing assembly and the sodium hypochlorite waste liquid collecting pool not only can meet the safety requirement for compounding of the sodium hypochlorite waste liquid, but also can be discharged to the G3 membrane system to be treated, and the process index that high-salinity wastewater is conveyed to the G3 membrane system to be treated is met.

Description

TECHNICAL FIELD

[0001] The utility model belongs to wastewater comprehensive utilization technical field, especially relate to a device for effectively controlling pH value and effective chlorine of sodium hypochlorite waste liquid. BACKGROUND

[0002] Vinyl acetate is one of the largest organic chemical raw materials in the world, which is widely used in the production of polyvinyl acetate (PVAc), polyvinyl alcohol, paint, slurry, adhesive, vinylon, film, vinyl copolymer resin, acetal resin and a series of chemical and chemical fiber products, and its application involves various industries.

[0003] There are two kinds of vinyl acetate production process routes, ethylene method and acetylene method, and China mainly uses calcium carbide acetylene method. In the process of calcium carbide method vinyl acetate production, in order to avoid poisoning of the synthesis catalyst, sodium hypochlorite solution with effective chlorine 0.085-0.12% is needed to remove hydrogen sulfide, phosphine and other impurity gases contained in crude acetylene. According to the quality of most calcium carbide in China, the volume ratio of sodium hypochlorite solution consumption to purified acetylene in acetylene purification process is about 1:140, and a set of 100,000 tons / year PVA device needs 25m 3 3 sodium hypochlorite solution with effective chlorine 0.085-0.12% per hour. The waste sodium hypochlorite solution (referred to as sodium hypochlorite waste liquid) generated after the synthesis process is treated and discharged into the waste sodium buffer tank, and then introduced into the heater through the pipeline for heating, acetylene gas removal and other treatments. Finally, the sodium hypochlorite waste liquid is sent to the waste sodium configuration system for secondary mixing and recycling, and part of it needs to be treated and discharged. Because the raw material calcium carbide contains a small amount of impurities calcium phosphide and calcium sulfide, these impurities also react with water in the process of generating acetylene gas by adding water to calcium carbide, generating Ca(OH)2. In order to ensure that the mixed water is weakly alkaline, a certain amount of alkali needs to be added to the waste sodium buffer tank. Sodium hydroxide reacts with dissolved carbon dioxide in the purified waste water to generate sodium carbonate, and calcium ions in calcium hydroxide react with carbonate ions in sodium carbonate to generate CaCO3 and other precipitates, which will cause the blockage of the delivery pipeline from the buffer tank to the heater, and also cause the scaling of the heater. If the process control is not reasonable, or if the dissolved carbon dioxide in the purified waste water is excessive, sodium bicarbonate will be generated with the generated sodium carbonate when the saturated solution is reached, which will cause crystallization, which may also block the tower and pipeline. The maintenance of the above blockage will waste a lot of manpower and material resources. UTILITY MODEL CONTENTS

[0004] The utility model discloses a device for effectively controlling the pH value and effective chlorine of sodium hypochlorite waste liquid, which can effectively alleviate the pipeline scaling and blockage during the material conveying process of the waste sodium hypochlorite buffer tank to the degassing tower, alleviate the scaling and blockage of the waste sodium hypochlorite heater, and prolong the service life of the matching device.

[0005] To achieve the above technical purposes and effects, the utility model discloses the following technical scheme:

[0006] A device for effectively controlling the pH value and effective chlorine of sodium hypochlorite waste liquid, comprising a sodium hypochlorite waste liquid buffer tank, a washing assembly connected to the inlet of the sodium hypochlorite waste liquid buffer tank, a waste liquid treatment assembly connected to the outlet of the sodium hypochlorite waste liquid buffer tank, a sodium hypochlorite waste liquid collecting pool connected to the outlet of the waste liquid treatment assembly, a sodium hypochlorite waste liquid cooling tower connected to the outlet of the sodium hypochlorite waste liquid collecting pool, a sodium hypochlorite mixer and a G3 membrane system respectively connected to the outlet of the sodium hypochlorite waste liquid cooling tower, a concentrated sodium hypochlorite storage tank also connected to the inlet of the sodium hypochlorite mixer, a chlorine gas absorption tower connected to the inlet of the concentrated sodium hypochlorite storage tank, and an alkali mixture connected to the inlet of the chlorine gas absorption tower.

[0007] The inlet of the alkali mixture is connected to a desalted water delivery pipeline and an alkali delivery pipeline, and a branch pipeline one is arranged on the alkali delivery pipeline.

[0008] Further, the outlet of the sodium hypochlorite mixer is connected to a fresh sodium hypochlorite storage tank, the outlet of the fresh sodium hypochlorite storage tank is connected to a fresh sodium hypochlorite pump through a pipeline, and the outlet of the fresh sodium hypochlorite pump is connected to a sodium hypochlorite washing tower B circulating pump through a pipeline.

[0009] The washing assembly comprises a sodium hypochlorite washing tower A and a sodium hypochlorite washing tower B, the sodium hypochlorite washing tower A is respectively provided with a washing tower A inlet one and a washing tower A inlet two, and the sodium hypochlorite washing tower B is respectively provided with a washing tower B inlet one and a washing tower B inlet two.

[0010] The outlet of the sodium hypochlorite washing tower B circulating pump is connected to the washing tower B inlet one through a pipeline.

[0011] The sodium hypochlorite washing tower B is provided with washing tower B outlet one, washing tower B outlet two and washing tower B outlet three, the outlet of the washing tower B outlet two is communicated with a sodium hypochlorite washing tower B kettle liquid pump through a pipeline, the outlet of the sodium hypochlorite washing tower B kettle liquid pump is communicated with a sodium hypochlorite washing tower A circulating pump through a pipeline, and the outlet of the sodium hypochlorite washing tower A circulating pump is communicated to the washing tower A inlet one through a pipeline.

[0012] The sodium hypochlorite washing tower A is provided with washing tower A outlet one, washing tower A outlet two and washing tower A outlet three, the outlet of the washing tower A outlet two is communicated with a sodium hypochlorite washing tower A kettle liquid pump through a pipeline, and the outlet of the sodium hypochlorite washing tower A kettle liquid pump is communicated to a sodium hypochlorite waste liquid buffer tank through a pipeline.

[0013] The waste liquid treatment assembly comprises a sodium hypochlorite waste liquid heater and a sodium hypochlorite waste liquid degassing tower, the outlet of the sodium hypochlorite waste liquid heater is communicated to the sodium hypochlorite waste liquid degassing tower, and the outlet of the sodium hypochlorite waste liquid degassing tower is communicated to a sodium hypochlorite waste liquid collecting pool.

[0014] The outlet of the sodium hypochlorite waste liquid buffer tank is communicated with a sodium hypochlorite waste liquid conveying pump through a pipeline, and the outlet of the sodium hypochlorite waste liquid conveying pump is communicated to the sodium hypochlorite waste liquid heater through a pipeline.

[0015] Further, the outlet of the washing tower B outlet one is communicated to a pipeline between the fresh sodium hypochlorite pump and the sodium hypochlorite washing tower B circulating pump through a pipeline.

[0016] The outlet of the washing tower A outlet one is communicated to a pipeline between the sodium hypochlorite washing tower B kettle liquid pump and the sodium hypochlorite washing tower A circulating pump through a pipeline.

[0017] Further, the washing tower A inlet two is communicated with a crude acetylene conveying pipeline through a pipeline.

[0018] The outlet of the washing tower A outlet three is communicated to the washing tower B inlet two through a pipeline.

[0019] The outlet of the washing tower B outlet three is communicated with an acetylene alkali removal tower through a pipeline.

[0020] The sodium hypochlorite waste liquid degassing tower is provided with degassing tower outlet one and degassing tower outlet two, the outlet of the degassing tower outlet one is communicated to a pipeline between the washing tower A inlet two and the crude acetylene conveying pipeline through a pipeline.

[0021] The outlet of the degassing tower outlet two is communicated to the sodium hypochlorite waste liquid collecting pool.

[0022] Further, a pH on-line measuring instrument three is further arranged on the pipeline between the outlet of the sodium hypochlorite washing tower B circulating pump and the washing tower B inlet one.

[0023] Further, the alkali liquor mixer is provided with a mixer inlet one, a mixer inlet two and a mixer inlet three, the desalted water conveying pipeline is communicated with the mixer inlet one, and the alkali liquor conveying pipeline is communicated with the mixer inlet two;

[0024] The chlorine absorption tower is provided with an absorption tower outlet one and an absorption tower outlet two, the outlet of the absorption tower outlet one is communicated with the mixer inlet three through a pipeline, and the outlet of the absorption tower outlet two is communicated with the concentrated sodium hypochlorite storage tank through a pipeline.

[0025] The chlorine absorption tower is further provided with an absorption tower inlet one and an absorption tower inlet two, the absorption tower inlet one is communicated with a liquid chlorine vaporizer through a pipeline, and the inlet of the liquid chlorine vaporizer is communicated with a liquid chlorine conveying pipeline through a pipeline.

[0026] The outlet of the alkali liquor mixer is connected with the absorption tower inlet two through a pipeline.

[0027] Further, the pipeline between the absorption tower outlet two and the concentrated sodium hypochlorite storage tank is further provided with a pH on-line measuring instrument two.

[0028] Further, the outlet of the concentrated sodium hypochlorite storage tank is communicated with a concentrated sodium hypochlorite pump through a pipeline, and the outlet of the concentrated sodium hypochlorite pump is communicated with a sodium hypochlorite mixer through a pipeline.

[0029] Further, the outlet of the sodium hypochlorite waste liquid collecting tank is communicated with a sodium hypochlorite waste liquid cooling pump through a pipeline, and the outlet of the sodium hypochlorite waste liquid cooling pump is communicated with a sodium hypochlorite waste liquid cooling tower through a pipeline.

[0030] The outlet of the sodium hypochlorite waste liquid cooling tower is communicated with a sodium hypochlorite waste liquid recycling pump through a pipeline, and the outlet of the sodium hypochlorite waste liquid recycling pump is communicated with a sodium hypochlorite mixer through a pipeline.

[0031] The pipeline between the sodium hypochlorite waste liquid cooling tower and the sodium hypochlorite waste liquid recycling pump is further provided with a branch pipeline two, the outlet of the branch pipeline two is provided with a high-salt wastewater pump, and the outlet of the high-salt wastewater pump is communicated with a G3 membrane system through a pipeline.

[0032] Further, the pipeline between the sodium hypochlorite waste liquid collecting tank and the sodium hypochlorite waste liquid cooling pump is provided with a pH on-line measuring instrument one.

[0033] Compared with the prior art, the beneficial effects of the utility model are:

[0034] The utility model provides a device of effective control sodium hypochlorite waste liquid pH value and effective chlorine, through control sodium hypochlorite waste liquid pH, can carry out the recycling to sodium hypochlorite waste liquid, with the fresh sodium hypochlorite prepared by the compounding of concentrated sodium hypochlorite, the fresh sodium hypochlorite prepared meets the process index requirement, guarantees safety production, in addition, the sodium hypochlorite waste liquid not participating in the compounding can meet the process index requirement of G3 membrane system treatment of high salt waste water, the setting, still can effectively alleviate the pipeline scale blocking of waste sodium buffer tank to degassing tower material conveying process, alleviate the scale blocking of waste sodium heater, prolong the use cycle of the matched device. BRIEF DESCRIPTION OF DRAWINGS

[0035] The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and serve to explain the utility model, and shall not be construed as limiting the utility model. In the drawings:

[0036] Fig. 1 It is the structural schematic diagram of the utility model;

[0037] Fig. 2 It is the local structural schematic diagram of the utility model;

[0038] Fig. 3 It is the local structural schematic diagram of the utility model.

[0039] Wherein, the reference signs are: 1, sodium hypochlorite waste liquid buffer tank; 2, sodium hypochlorite waste liquid conveying pump; 3, sodium hypochlorite waste liquid heater; 4, sodium hypochlorite waste liquid degassing tower; 5, sodium hypochlorite waste liquid collection tank; 6, sodium hypochlorite waste liquid cooling pump; 7, pH on-line measuring instrument one; 8, sodium hypochlorite waste liquid cooling tower; 9, sodium hypochlorite waste liquid recycling pump; 10, lye mixer; 11, liquid chlorine vaporizer; 12, chlorine absorption tower; 13, concentrated sodium hypochlorite storage tank; 14, concentrated sodium hypochlorite pump; 15, sodium hypochlorite mixer; 16, fresh sodium hypochlorite storage tank; 17, fresh sodium hypochlorite pump; 18, pH on-line measuring instrument two; 19, high-salinity wastewater pump; 20, sodium hypochlorite washing tower A; 21, sodium hypochlorite washing tower A circulating pump; 22, sodium hypochlorite washing tower A kettle liquid pump; 23, sodium hypochlorite washing tower B; 24, sodium hypochlorite washing tower B circulating pump; 25, sodium hypochlorite washing tower B kettle liquid pump; 26, pH on-line measuring instrument three; 100, washing assembly; 200, waste liquid treatment assembly; 300, G3 membrane system; 101, desalted water conveying pipeline; 102, lye conveying pipeline; 103, branch pipeline one; 104, mixer inlet one; 105, mixer inlet two; 106, mixer inlet three; 201, washing tower A inlet one; 202, washing tower A inlet two; 203, washing tower A outlet one; 204, washing tower A outlet two; 205, washing tower A outlet three; 206, crude acetylene conveying pipeline; 231, washing tower B inlet one; 232, washing tower B inlet two; 233, washing tower B outlet one; 234, washing tower B outlet two; 235, washing tower B outlet three; 236, acetylene alkali removal tower; 41, degassing tower outlet one; 42, degassing tower outlet two; 121, absorption tower outlet one; 122, absorption tower outlet two; 123, absorption tower inlet one; 124, absorption tower inlet two; 111, liquid chlorine conveying pipeline; 801, branch pipeline two. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0041] In the description of the utility model, it is understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated components or elements must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0042] As Figs. 1-3 shown, a device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid, comprising a sodium hypochlorite waste liquid buffer tank 1, a washing assembly 100 is communicated with the inlet of the sodium hypochlorite waste liquid buffer tank 1, a waste liquid treatment assembly 200 is communicated with the outlet of the sodium hypochlorite waste liquid buffer tank 1, a sodium hypochlorite waste liquid collection tank 5 is communicated with the outlet of the waste liquid treatment assembly 200, a sodium hypochlorite waste liquid cooling tower 8 is communicated with the outlet of the sodium hypochlorite waste liquid collection tank 5, a sodium hypochlorite mixer 15 and a G3 membrane system 300 are respectively communicated with the outlet of the sodium hypochlorite waste liquid cooling tower 8, the inlet of the sodium hypochlorite mixer 15 is also communicated with a concentrated sodium hypochlorite storage tank 13, the inlet of the concentrated sodium hypochlorite storage tank 13 is communicated with a chlorine absorption tower 12, and the inlet of the chlorine absorption tower 12 is communicated with a lye mixer 10.

[0043] The inlet of the lye mixer 10 is communicated with a desalted water delivery pipeline 101 and a lye delivery pipeline 102, a branch pipeline I 103 is arranged on the lye delivery pipeline 102, and the outlet of the branch pipeline I 103 is communicated to the sodium hypochlorite waste liquid collection tank 5.

[0044] In addition, the outlet of the sodium hypochlorite mixer 15 is communicated with a fresh sodium hypochlorite storage tank 16 through a pipeline, and the outlet of the fresh sodium hypochlorite storage tank 16 is communicated to the washing assembly 100 through a pipeline.

[0045] In the utility model, the inlet of the lye mixer 10 is communicated with a desalted water delivery pipeline 101 and a lye delivery pipeline 102, and the desalted water delivery pipeline 101 and the lye delivery pipeline 102 are respectively used for delivering desalted water and dilute lye to the lye mixer 10, and specifically, the dilute lye can be dilute lye with a concentration of 8%, the desalted water and the 8% dilute lye are sent into the lye mixer 10, and then into the chlorine absorption tower 12, liquid chlorine enters the chlorine absorption tower 12 through a liquid chlorine vaporizer, reacts with the dilute lye, and the obtained concentrated sodium hypochlorite is delivered to the concentrated sodium hypochlorite storage tank 13, in this process, the pH value of the concentrated sodium hypochlorite is adjusted to 10-12.

[0046] The sodium hypochlorite waste liquid buffer tank 1 in the utility model is from the sodium hypochlorite waste liquid produced in the synthesis process of calcium carbide acetylene process in the production process of vinyl acetate, after heating and degassing treatment by the waste liquid treatment assembly 200, the sodium hypochlorite waste liquid is sent into the sodium hypochlorite waste liquid collecting pool 5, wherein the pipeline of the waste liquid treatment assembly 200 conveying to the sodium hypochlorite waste liquid collecting pool 5 is deep into the liquid level below the sodium hypochlorite waste liquid collecting pool 5, because the branch pipeline one 103 is arranged on the alkali conveying pipeline 102, the outlet of the branch pipeline one 103 is communicated to the sodium hypochlorite waste liquid collecting pool 5, namely the dilute alkali (concretely, the dilute alkali is the dilute alkali with the concentration of 8%) can be added to the sodium hypochlorite waste liquid collecting pool 5 through the branch pipeline one 103, after the sodium hypochlorite waste liquid collecting pool 5 carries out alkali adding and reprocessing to the sodium hypochlorite waste liquid, the sodium hypochlorite waste liquid is conveyed to the sodium hypochlorite waste liquid cooling tower 8, and then is conveyed to the sodium hypochlorite mixer 15 and the G3 membrane system 300 respectively through the sodium hypochlorite waste liquid cooling tower 8.

[0047] After the concentrated sodium hypochlorite in the concentrated sodium hypochlorite storage tank 13 is mixed uniformly with the treated sodium hypochlorite waste liquid from the sodium hypochlorite waste liquid cooling tower 8, the concentrated sodium hypochlorite is conveyed to the fresh sodium hypochlorite storage tank 16, and then is sent into the washing assembly 100 through the fresh sodium hypochlorite storage tank 16, and is in countercurrent contact with the crude acetylene from the acetylene process, and the sodium hypochlorite waste liquid generated after the countercurrent contact is sent into the sodium hypochlorite waste liquid buffer tank 1.

[0048] As shown in the drawings, Figs. 1-3 In some embodiments of the utility model, the outlet of the sodium hypochlorite mixer 15 is communicated with the fresh sodium hypochlorite storage tank 16, the outlet of the fresh sodium hypochlorite storage tank 16 is communicated with the fresh sodium hypochlorite pump 17 through a pipeline, and the outlet of the fresh sodium hypochlorite pump 17 is communicated with the sodium hypochlorite washing tower B circulating pump 24 through a pipeline.

[0049] The washing assembly 100 includes the sodium hypochlorite washing tower A 20 and the sodium hypochlorite washing tower B 23, the sodium hypochlorite washing tower A 20 is respectively provided with the washing tower A inlet one 201 and the washing tower A inlet two 202, and the sodium hypochlorite washing tower B 23 is respectively provided with the washing tower B inlet one 231 and the washing tower B inlet two 232.

[0050] The outlet of the sodium hypochlorite washing tower B circulating pump 24 is communicated to the washing tower B inlet one 231 through a pipeline.

[0051] The sodium hypochlorite washing tower B 23 is provided with the washing tower B outlet one 233, the washing tower B outlet two 234 and the washing tower B outlet three 235, the outlet of the washing tower B outlet two 234 is communicated with the sodium hypochlorite washing tower B kettle liquid pump 25 through a pipeline, the outlet of the sodium hypochlorite washing tower B kettle liquid pump 25 is communicated with the sodium hypochlorite washing tower A circulating pump 21 through a pipeline, and the outlet of the sodium hypochlorite washing tower A circulating pump 21 is communicated to the washing tower A inlet one 201 through a pipeline.

[0052] The sodium hypochlorite washing tower A is provided with a washing tower A outlet one 203, a washing tower A outlet two 204 and a washing tower A outlet three 205, the outlet of the washing tower A outlet two 204 is communicated with a sodium hypochlorite washing tower A kettle liquid pump 22 through a pipeline, and the outlet of the sodium hypochlorite washing tower A kettle liquid pump 22 is communicated to a sodium hypochlorite waste liquid buffer tank 1 through a pipeline;

[0053] The waste liquid treatment assembly 200 comprises a sodium hypochlorite waste liquid heater 3 and a sodium hypochlorite waste liquid degassing tower 4, the outlet of the sodium hypochlorite waste liquid heater 3 is communicated to the sodium hypochlorite waste liquid degassing tower 4, and the outlet of the sodium hypochlorite waste liquid degassing tower 4 is communicated to a sodium hypochlorite waste liquid collecting pool 5;

[0054] The outlet of the sodium hypochlorite waste liquid buffer tank 1 is communicated with a sodium hypochlorite waste liquid conveying pump 2 through a pipeline, and the outlet of the sodium hypochlorite waste liquid conveying pump 2 is communicated to the sodium hypochlorite waste liquid heater 3 through a pipeline.

[0055] As shown in the drawings, Figs. 1-3 In some embodiments of the utility model, the outlet of the washing tower B outlet one 233 is communicated to a pipeline between the fresh sodium hypochlorite pump 17 and the sodium hypochlorite washing tower B circulating pump 24 through a pipeline;

[0056] The outlet of the washing tower A outlet one 203 is communicated to a pipeline between the sodium hypochlorite washing tower B kettle liquid pump 25 and the sodium hypochlorite washing tower A circulating pump 21 through a pipeline.

[0057] As shown in the drawings, Figs. 1-3 In some embodiments of the utility model, the washing tower A inlet two 202 is communicated with a crude acetylene conveying pipeline 206 through a pipeline;

[0058] The outlet of the washing tower A outlet three 205 is communicated to the washing tower B inlet two 232 through a pipeline;

[0059] The outlet of the washing tower B outlet three 235 is communicated with an acetylene alkali removal tower 236 through a pipeline;

[0060] The sodium hypochlorite waste liquid degassing tower 4 is provided with a degassing tower outlet one 41 and a degassing tower outlet two 42, the outlet of the degassing tower outlet one 41 is communicated to a pipeline between the washing tower A inlet two 202 and the crude acetylene conveying pipeline 206 through a pipeline;

[0061] The outlet of the degassing tower outlet two 42 is communicated to the sodium hypochlorite waste liquid collecting pool 5;

[0062] Specifically, the sodium hypochlorite waste liquid buffer tank 1 is connected with the sodium hypochlorite waste liquid conveying pump 2 through a pipeline, the outlet of the sodium hypochlorite waste liquid conveying pump 2 is connected with the inlet of the sodium hypochlorite waste liquid heater 3 through a pipeline, the outlet of the sodium hypochlorite waste liquid heater 3 is connected with the inlet of the sodium hypochlorite waste liquid degassing tower 4 through a pipeline, and the outlet of the degassing tower outlet one 41 is connected with the pipeline between the inlet two 202 of the washing tower A and the crude acetylene conveying pipeline 206 through a pipeline, that is, the acetylene gas is reused from the top outlet (i.e. the degassing tower outlet one 41) of the sodium hypochlorite waste liquid degassing tower 4.

[0063] The lower liquid outlet (i.e. the degassing tower outlet two 42) of the sodium hypochlorite waste liquid degassing tower 4 is connected with the inlet of the sodium hypochlorite waste liquid collecting tank 5 through a pipeline, and specifically, the pipeline is deep into the liquid level of the sodium hypochlorite waste liquid collecting tank 5; 8% dilute lye is added into the inlet of the sodium hypochlorite waste liquid collecting tank 5 through a pipeline (i.e. the branch pipeline one 103).

[0064] Specifically, the outlet of the sodium hypochlorite mixer 15 is connected with the inlet of the fresh sodium hypochlorite storage tank 16 through a pipeline, the outlet of the fresh sodium hypochlorite storage tank 16 is connected with the inlet of the fresh sodium hypochlorite pump 17 through a pipeline, the outlet of the fresh sodium hypochlorite pump 17 is connected with the inlet of the sodium hypochlorite washing tower B circulating pump 24 through a pipeline, the outlet of the sodium hypochlorite washing tower B circulating pump 24 is connected with the washing tower B inlet one 231 of the sodium hypochlorite washing tower B 23 through a pipeline, the washing tower B outlet two 234 of the sodium hypochlorite washing tower B 23 is connected with the inlet of the sodium hypochlorite washing tower B kettle liquid pump 25 through a pipeline, the outlet of the sodium hypochlorite washing tower B kettle liquid pump 25 is connected with the inlet of the sodium hypochlorite washing tower A circulating pump 21 through a pipeline, the outlet of the sodium hypochlorite washing tower A circulating pump 21 is connected with the washing tower A inlet one 201 of the sodium hypochlorite washing tower A 20 through a pipeline, the washing tower A outlet two 204 on the sodium hypochlorite washing tower A 20 is connected with the inlet of the sodium hypochlorite washing tower A kettle liquid pump 22 through a pipeline, and the outlet of the sodium hypochlorite washing tower A kettle liquid pump 22 is connected with the sodium hypochlorite waste liquid buffer tank 1 through a pipeline.

[0065] Specifically, the crude acetylene in the acetylene process enters the washing tower A inlet two 202 of the sodium hypochlorite washing tower A 20 through the crude acetylene conveying pipeline 206, the top outlet (i.e. the washing tower A outlet three 205) of the sodium hypochlorite washing tower A 20 is connected with the washing tower B inlet two 232 of the sodium hypochlorite washing tower B 23 through a pipeline, and the top outlet (i.e. the washing tower B outlet three 235) of the sodium hypochlorite washing tower B 23 is connected with the acetylene gas alkali washing tower 236 through a pipeline.

[0066] As shown in FIG. 1, the acetylene gas is introduced into the washing tower A 20 of the sodium hypochlorite washing tower A through the crude acetylene conveying pipeline 206, and the acetylene gas is introduced into the washing tower B 23 of the sodium hypochlorite washing tower B through the washing tower A outlet three 205 of the sodium hypochlorite washing tower A 20. Figs. 1-3As shown in some embodiments of the utility model, the pipeline between the outlet of sodium hypochlorite washing tower B circulating pump 24 and washing tower B inlet one 231 is also provided with pH on -line measuring instrument three 26; the pH on -line measuring instrument three 26 is used to detect the pH of fresh sodium hypochlorite into sodium hypochlorite washing tower B 23, generally set to 6.5-7.5, guarantee the stability of process, guarantee the related equipment does not scale.

[0067] As Figs. 1-3 As shown in some embodiments of the utility model, the alkali liquor mixer 10 is provided with mixer inlet one 104, mixer inlet two 105 and mixer inlet three 106, the desalted water delivery pipeline 101 is communicated with the mixer inlet one 104, the alkali liquor delivery pipeline 102 is communicated with the mixer inlet two 105;

[0068] The chlorine absorption tower 12 is provided with absorption tower outlet one 121 and absorption tower outlet two 122, the outlet of absorption tower outlet one 121 is communicated to the mixer inlet three 106 through the pipeline, the outlet of absorption tower outlet two 122 is communicated to the concentrated sodium hypochlorite storage tank 13 through the pipeline;

[0069] The chlorine absorption tower 12 is also provided with absorption tower inlet one 123 and absorption tower inlet two 124, the absorption tower inlet one 123 is communicated with the liquid chlorine vaporizer 11 through the pipeline, the inlet of liquid chlorine vaporizer 11 is communicated with the liquid chlorine delivery pipeline 111 through the pipeline; the outlet of alkali liquor mixer 10 is connected to the absorption tower inlet two 124 through the pipeline.

[0070] As Figs. 1-3 As shown in some embodiments of the utility model, the pipeline between the absorption tower outlet two 122 and the concentrated sodium hypochlorite storage tank 13 is also provided with pH on -line measuring instrument two 18.

[0071] As Figs. 1-3 As shown in some embodiments of the utility model, the outlet of concentrated sodium hypochlorite storage tank 13 is communicated with the concentrated sodium hypochlorite pump 14 through the pipeline, the outlet of concentrated sodium hypochlorite pump 14 is communicated to the sodium hypochlorite mixer 15 through the pipeline.

[0072] As Figs. 1-3 As shown in some embodiments of the utility model, the outlet of sodium hypochlorite waste liquid collecting pool 5 is communicated with the sodium hypochlorite waste liquid cooling pump 6 through the pipeline, the outlet of sodium hypochlorite waste liquid cooling pump 6 is communicated to the sodium hypochlorite waste liquid cooling tower 8 through the pipeline;

[0073] The outlet of sodium hypochlorite waste liquid cooling tower 8 is communicated with the sodium hypochlorite waste liquid recycling pump 9 through the pipeline, the outlet of sodium hypochlorite waste liquid recycling pump 9 is communicated to the sodium hypochlorite mixer 15 through the pipeline;

[0074] A branch pipeline 801 is also provided on the pipeline between the sodium hypochlorite waste cooling tower 8 and the sodium hypochlorite waste recycling pump 9. A high-salt wastewater pump 19 is provided at the outlet of the branch pipeline 801. The outlet of the high-salt wastewater pump 19 is connected to the G3 membrane system 300 through a pipeline.

[0075] like Figs. 1-3 Figs. 1-3 As shown, in some embodiments of this utility model, a pH online measuring instrument 7 is installed on the pipeline between the sodium hypochlorite waste collection tank 5 and the sodium hypochlorite waste cooling pump 6;

[0076] Specifically, the outlet of sodium hypochlorite waste collection tank 5 is connected to the inlet 6 of sodium hypochlorite waste cooling pump via a pipeline. A pH online measuring instrument 7 is installed on the pipeline between the outlet of sodium hypochlorite waste collection tank 5 and sodium hypochlorite waste cooling pump 6. Sodium hypochlorite waste cooling pump 6 is connected to sodium hypochlorite waste cooling tower 8 via a pipeline. The outlet of sodium hypochlorite waste cooling tower 8 is connected to the inlet of sodium hypochlorite waste reuse pump 9 and the inlet of high-salt wastewater pump 19 via a pipeline and a branch pipeline 801, respectively. The outlet of sodium hypochlorite waste reuse pump 9 is connected to the top inlet of sodium hypochlorite mixer 15 via a pipeline. The outlet of high-salt wastewater pump 19 is connected to G3 membrane system 300 via a pipeline.

[0077] An 8% dilute alkali solution is added to the mixer inlet 105 of the alkali mixer 10 through the alkali solution delivery pipeline 102. Demineralized water is added to the mixer inlet 104 of the alkali mixer 10 through the demineralized water delivery pipeline 101. The outlet of the alkali mixer 10 is connected to the absorption tower inlet 124 of the chlorine absorption tower 12 through a pipeline. A liquid chlorine cylinder is connected to the inlet of the liquid chlorine vaporizer 11 through the liquid chlorine delivery pipeline 111. The outlet of the liquid chlorine vaporizer 11 is connected to the absorption tower inlet 123 of the chlorine absorption tower 12 through a pipeline. The absorption tower outlet 121 of the chlorine absorption tower 12 is connected to the mixer inlet 106 of the alkali mixer 10 through a pipeline. The absorption tower outlet 122 of the chlorine absorption tower 12 is connected to the inlet of the concentrated sodium hypochlorite storage tank 13 through a pipeline. An online pH meter 18 is also installed on the pipeline between the absorption tower outlet 122 and the concentrated sodium hypochlorite storage tank 13.

[0078] The outlet of the concentrated sodium hypochlorite storage tank 13 is connected to the inlet of the concentrated sodium hypochlorite pump 14 via a pipeline, and the outlet of the concentrated sodium hypochlorite pump 14 is connected to the inlet of the sodium hypochlorite mixer 15 via a pipeline.

[0079] The device for effectively controlling the pH value and effective chlorine of sodium hypochlorite waste liquid is applied to actual production, namely, a method for effectively controlling the pH value and effective chlorine of sodium hypochlorite waste liquid by adopting the device, the method comprising the following steps: heating and degassing of sodium hypochlorite waste liquid, adding alkali to adjust the pH value of the sodium hypochlorite waste liquid in a sodium hypochlorite waste liquid collecting tank, preparing concentrated sodium hypochlorite, sending out fresh sodium hypochlorite and unprepared high-salt waste water, and washing fresh sodium hypochlorite.

[0080] 1, heating and degassing of sodium hypochlorite waste liquid

[0081] The sodium hypochlorite waste liquid generated in the synthesis process of the calcium carbide acetylene process in the vinyl acetate production process is added from the inlet of the sodium hypochlorite waste liquid buffer tank 1, and plays a buffering role for the subsequent steps; the sodium hypochlorite waste liquid in the sodium hypochlorite waste liquid buffer tank 1 is sent into the sodium hypochlorite waste liquid heater 3 through the sodium hypochlorite waste liquid conveying pump 2, the sodium hypochlorite waste liquid heater 3 uses a tube heat exchanger, low-pressure steam is used as a heat source, and the heater temperature is controlled to be 50±5℃. The sodium hypochlorite waste liquid subjected to heat exchange treatment in the sodium hypochlorite waste liquid heater 3 is added into the sodium hypochlorite waste liquid degassing tower 4 for degassing treatment, specifically, high-temperature and low-pressure degassing is adopted, and the vacuum degree of the degassing tower is controlled to be-(50-70)KPa; in the sodium hypochlorite waste liquid degassing tower 4 with a certain vacuum degree, a large amount of water vapor is generated by the boiling of the sodium hypochlorite waste liquid, and due to the disturbance of the water vapor, most of the dissolved acetylene is continuously released from the sodium hypochlorite waste liquid; the released qualified acetylene is reused (i.e., the acetylene is released from the top outlet (i.e., the degassing tower outlet one 41) of the sodium hypochlorite waste liquid degassing tower 4 and reused);

[0082] In this step, in order to ensure that the sodium hypochlorite waste liquid buffer tank 1, the sodium hypochlorite waste liquid conveying pump 2, the sodium hypochlorite waste liquid heater 3, the sodium hypochlorite waste liquid degassing tower 4 and the connecting pipelines therein are not scaled, the pH value of the sodium hypochlorite waste liquid is not adjusted in this process, the main adjustment is the addition amount of fresh sodium hypochlorite and the effective chlorine content in the cleaning process, the acetylene gas is washed twice by the sodium hypochlorite solution to ensure the full use of the effective chlorine, and the pH value of the sodium hypochlorite waste liquid after washing is stably controlled to be 6.8-7.5, and the effective chlorine is less than 0.1mg / L;

[0083] 2, adding alkali to adjust the pH value of the waste liquid in the sodium hypochlorite collecting tank

[0084] The sodium hypochlorite waste liquid after degassing treatment is discharged from the outlet of the sodium hypochlorite waste liquid degassing tower 4 into the sodium hypochlorite waste liquid collecting tank 5; the waste liquid in the sodium hypochlorite waste liquid collecting tank 5 is transported to the sodium hypochlorite waste liquid cooling tower 8 by the sodium hypochlorite waste liquid cooling pump 6; the inlet pipeline of the sodium hypochlorite waste liquid collecting tank 5 extends below the liquid level of the sodium hypochlorite waste liquid collecting tank 5, thereby playing a role of safety liquid seal; 8% dilute lye is added into the sodium hypochlorite waste liquid collecting tank 5 through the inlet thereof, and mixed with the waste sodium hypochlorite solution, so that the sodium hypochlorite solution is weakly alkaline;

[0085] The weakly alkaline sodium hypochlorite solution in the sodium hypochlorite waste liquid collecting tank 5 is added into the sodium hypochlorite waste liquid cooling tower 8 through the inlet thereof, so as to be cooled and aerated, and further reduce the content of acetylene gas in the solution;

[0086] In this step, the pH of the sodium hypochlorite waste liquid collecting tank 5 is adjusted to 7.5-8.5 according to the pH on-line measuring instrument 7, the effective chlorine in the sodium hypochlorite waste liquid is adjusted to less than 0.1 mg / L, and the pH and the effective chlorine of the high-salinity waste water to be sent out are ensured not to affect the treatment capacity of the G3 membrane system 300;

[0087] 3. Preparation of concentrated sodium hypochlorite

[0088] The desalted water and 8% dilute lye are respectively sent into the lye mixer 10 through the desalted water conveying pipeline 101 and the lye conveying pipeline 102, and then into the chlorine gas absorption tower 12; the liquid chlorine is sent into the liquid chlorine vaporizer 11 through the closed liquid chlorine conveying pipeline 111, completely vaporized, and then sent into the chlorine gas absorption tower 12 to react with the dilute lye; the chlorine gas which has not completely reacted is returned to the lye mixer 10 for secondary absorption; the proportion of chlorine gas, desalted water and 8% dilute lye is controlled to be 5:1:0.175;

[0089] The concentrated sodium hypochlorite in the chlorine gas absorption tower 12 flows into the concentrated sodium hypochlorite storage tank 13, the effective chlorine of the concentrated sodium hypochlorite is controlled to be 12-15 g / L, and the pH of the concentrated sodium hypochlorite is adjusted to be 10-12, preferably 11-12;

[0090] In this step, the liquid chlorine vaporizer 11 is a tubular heat exchanger, hot water is used as heat source, the temperature of the hot water is controlled to be 75℃, and the pressure of the chlorine gas absorption tower 12 is controlled to be 130 kPa;

[0091] 4. Preparation of fresh sodium hypochlorite and sending of high-salinity waste water without re-compounding

[0092] The concentrated sodium hypochlorite in the concentrated sodium hypochlorite storage tank 13 is transported to the sodium hypochlorite mixer 15 by the concentrated sodium hypochlorite pump 14, the sodium hypochlorite waste liquid in the sodium hypochlorite waste liquid cooling tower 8 is transported to the sodium hypochlorite mixer 15 by the sodium hypochlorite waste liquid recycling pump 9, the concentrated sodium hypochlorite and the sodium hypochlorite waste liquid are uniformly mixed, and then enter the fresh sodium hypochlorite storage tank 16, and the sodium hypochlorite waste liquid which has not participated in re-compounding is sent to the G3 membrane system 300 by the high-salinity waste water pump 19.

[0093] Specifically, the sodium hypochlorite waste liquid in the sodium hypochlorite waste liquid cooling tower 8 is transported to the sodium hypochlorite mixer 15 and the G3 membrane system 300 respectively, and the ratio of the sodium hypochlorite waste liquid transported to the sodium hypochlorite mixer 15 and the G3 membrane system 300 respectively is 9:1, that is, 90% of the total volume of the sodium hypochlorite waste liquid treated by the sodium hypochlorite waste liquid cooling tower 8 is sent out from the outlet of the sodium hypochlorite waste liquid cooling tower 8, sent to the sodium hypochlorite mixer 15 by the sodium hypochlorite waste liquid recycling pump 9, and 10% of the total volume of the sodium hypochlorite waste liquid not involved in the compounding is sent to the G3 membrane system 300 by the high-salinity wastewater pump 19. In this process, the high-salinity wastewater not involved in the compounding is sent to the G3 membrane system 300, which does not cause damage to the membrane and does not affect the membrane retention rate.

[0094] In the sodium hypochlorite mixer 15, the sodium hypochlorite waste liquid from the sodium hypochlorite waste liquid cooling tower 8 is mixed with the concentrated sodium hypochlorite from the concentrated sodium hypochlorite storage tank 13 at a ratio of 0.2:1, and then enters the fresh sodium hypochlorite storage tank 16. The pH of the fresh sodium hypochlorite is controlled at 7-8 according to the pH of the concentrated sodium hypochlorite, and the effective chlorine in the fresh sodium hypochlorite is controlled at 1-1.5g / L.

[0095] In this step, the entire sodium hypochlorite preparation system is continuously supplemented with concentrated sodium hypochlorite, and only effective chlorine is consumed in the synthesis cleaning process. The reacted sodium hypochlorite waste liquid needs to be continuously compounded and discharged. The high-salinity wastewater has a high content of chloride ions and cannot be sent to the sewage treatment plant. If the high-salinity wastewater is directly transported to the G3 membrane system 300, the presence of effective chlorine will cause the membrane to degrade prematurely due to its strong oxidizing property, affecting the service life of the membrane element. Therefore, in this step, the effective chlorine in the sodium hypochlorite waste liquid is required to be less than 0.1mg / L, and the pH is controlled at 7.5-9.

[0096] 5. Fresh sodium hypochlorite washing

[0097] The crude acetylene in the acetylene process is sent to the washing tower A inlet two 202 of the sodium hypochlorite washing tower A 20, and then to the washing tower B inlet two 232 of the sodium hypochlorite washing tower B 23. Fresh sodium hypochlorite is sent to the sodium hypochlorite washing tower B 23 inlet through the sodium hypochlorite washing tower B circulating pump 24, and then contacts with the acetylene gas in countercurrent, and then is sent to the washing tower A inlet one 201 of the sodium hypochlorite washing tower A 20 through the sodium hypochlorite washing tower B kettle liquid pump 25 from the sodium hypochlorite washing tower B 23, and then is contacted with the rising acetylene gas in countercurrent for the second time, and then is sent to the sodium hypochlorite waste liquid buffer tank 1 through the sodium hypochlorite washing tower A kettle liquid pump 22 from the sodium hypochlorite washing tower A 20.

[0098] The acetylene gas at the top of the sodium hypochlorite washing tower B 23 is sent to the acetylene alkali removal tower 236 through the washing tower B outlet three 235, and the content of phosphine in the acetylene gas is controlled to be less than 37ppm and the content of hydrogen sulfide is controlled to be less than 39ppm according to the amount of sodium hypochlorite added.

[0099] In this step, the circulation amount of sodium hypochlorite washing tower A20 is controlled at 110±5m 3 / h, the circulation amount of sodium hypochlorite washing tower B 23 is controlled at 80±5m 3 / h, the effective chlorine index of sodium hypochlorite washing tower B 23 is controlled at <0.5g / L, and the pH of the sodium hypochlorite washing tower B is controlled at 7-8, so as to meet the sodium hypochlorite washing effect, ensure that the contents of phosphine and hydrogen sulfide in the crude acetylene are qualified, and the pH and effective chlorine of the waste liquid are qualified when the waste liquid is sent out of the degassing system and the high-salt waste water.

[0100] In the utility model, by controlling the pH of the sodium hypochlorite waste liquid, the pipeline scaling and plugging in the material conveying process from the sodium hypochlorite waste liquid buffer tank 1 to the sodium hypochlorite waste liquid degassing tower 4 can be effectively alleviated, and meanwhile, the scaling and plugging of the sodium hypochlorite waste liquid heater 3 can be effectively alleviated, the service life of the matching device is effectively prolonged, the consumption of the material during pickling is reduced, the labor intensity of the on-site personnel is reduced, and good economic benefits are obtained; by adding alkali in the sodium hypochlorite waste liquid collecting pool 5, the safety requirements of the sodium hypochlorite recombination can be met, and on the other hand, the process index of the high-salt waste water sent to the G3 membrane system 300 for treatment can be met.

[0101] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0102] The basic principles, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only illustrative of the principles of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid, characterized in that, The application relates to a sodium hypochlorite waste liquid buffer tank (1), an inlet of the sodium hypochlorite waste liquid buffer tank (1) is communicated with a washing assembly (100), an outlet of the sodium hypochlorite waste liquid buffer tank (1) is communicated with a waste liquid treatment assembly (200), an outlet of the waste liquid treatment assembly (200) is communicated with a sodium hypochlorite waste liquid collecting pool (5), an outlet of the sodium hypochlorite waste liquid collecting pool (5) is communicated with a sodium hypochlorite waste liquid cooling tower (8), an outlet of the sodium hypochlorite waste liquid cooling tower (8) is respectively communicated with a sodium hypochlorite mixer (15) and a G3 membrane system (300), an inlet of the sodium hypochlorite mixer (15) is further communicated with a concentrated sodium hypochlorite storage tank (13), an inlet of the concentrated sodium hypochlorite storage tank (13) is communicated with a chlorine gas absorption tower (12), and an inlet of the chlorine gas absorption tower (12) is communicated with a lye mixer (10). An inlet of the lye mixer (10) is communicated with a desalted water conveying pipeline (101) and a lye conveying pipeline (102), a branch pipeline I (103) is arranged on the lye conveying pipeline (102), and an outlet of the branch pipeline I (103) is communicated with the sodium hypochlorite waste liquid collecting pool (5).

2. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 1, characterized in that, An outlet of the sodium hypochlorite mixer (15) is communicated with a fresh sodium hypochlorite storage tank (16), an outlet of the fresh sodium hypochlorite storage tank (16) is communicated with a fresh sodium hypochlorite pump (17) through a pipeline, and an outlet of the fresh sodium hypochlorite pump (17) is communicated with a sodium hypochlorite washing tower B circulating pump (24) through a pipeline. The washing assembly (100) comprises a sodium hypochlorite washing tower A (20) and a sodium hypochlorite washing tower B (23), the sodium hypochlorite washing tower A (20) is respectively provided with a washing tower A inlet I (201) and a washing tower A inlet II (202), and the sodium hypochlorite washing tower B (23) is respectively provided with a washing tower B inlet I (231) and a washing tower B inlet II (232). An outlet of the sodium hypochlorite washing tower B circulating pump (24) is communicated with the washing tower B inlet I (231) through a pipeline. The sodium hypochlorite washing tower B (23) is provided with a washing tower B outlet I (233), a washing tower B outlet II (234) and a washing tower B outlet III (235), an outlet of the washing tower B outlet II (234) is communicated with a sodium hypochlorite washing tower B kettle liquid pump (25) through a pipeline, an outlet of the sodium hypochlorite washing tower B kettle liquid pump (25) is communicated with a sodium hypochlorite washing tower A circulating pump (21) through a pipeline, and an outlet of the sodium hypochlorite washing tower A circulating pump (21) is communicated with the washing tower A inlet I (201) through a pipeline. The sodium hypochlorite washing tower A (20) is provided with a washing tower A outlet I (203), a washing tower A outlet II (204) and a washing tower A outlet III (205), an outlet of the washing tower A outlet II (204) is communicated with a sodium hypochlorite washing tower A kettle liquid pump (22) through a pipeline, and an outlet of the sodium hypochlorite washing tower A kettle liquid pump (22) is communicated with the sodium hypochlorite waste liquid buffer tank (1) through a pipeline. The waste liquid treatment assembly (200) comprises a sodium hypochlorite waste liquid heater (3) and a sodium hypochlorite waste liquid degassing tower (4), the outlet of the sodium hypochlorite waste liquid heater (3) is communicated to the sodium hypochlorite waste liquid degassing tower (4), and the outlet of the sodium hypochlorite waste liquid degassing tower (4) is communicated to a sodium hypochlorite waste liquid collecting tank (5); The outlet of the sodium hypochlorite waste liquid buffer tank (1) is communicated with a sodium hypochlorite waste liquid conveying pump (2) through a pipeline, and the outlet of the sodium hypochlorite waste liquid conveying pump (2) is communicated to the sodium hypochlorite waste liquid heater (3) through a pipeline.

3. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 2, characterized in that, The outlet of the washing tower B outlet one (233) is communicated to a pipeline between a fresh sodium hypochlorite pump (17) and a sodium hypochlorite washing tower B circulating pump (24) through a pipeline; The outlet of the washing tower A outlet one (203) is communicated to a pipeline between a sodium hypochlorite washing tower B kettle liquid pump (25) and a sodium hypochlorite washing tower A circulating pump (21) through a pipeline.

4. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 2, characterized in that, The washing tower A inlet two (202) is communicated with a crude acetylene conveying pipeline (206) through a pipeline; The outlet of the washing tower A outlet three (205) is communicated to the washing tower B inlet two (232) through a pipeline; The outlet of the washing tower B outlet three (235) is communicated with an acetylene alkali removal tower (236) through a pipeline; The sodium hypochlorite waste liquid degassing tower (4) is provided with a degassing tower outlet one (41) and a degassing tower outlet two (42), the outlet of the degassing tower outlet one (41) is communicated to a pipeline between the washing tower A inlet two (202) and the crude acetylene conveying pipeline (206) through a pipeline; The outlet of the degassing tower outlet two (42) is communicated to the sodium hypochlorite waste liquid collecting tank (5).

5. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 2, characterized in that, A pH on-line measuring instrument three (26) is further arranged on a pipeline between the outlet of the sodium hypochlorite washing tower B circulating pump (24) and the washing tower B inlet one (231).

6. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 1, characterized in that, The alkali liquid mixer (10) is provided with a mixer inlet one (104), a mixer inlet two (105) and a mixer inlet three (106), the desalted water conveying pipeline (101) is communicated with the mixer inlet one (104), and the alkali liquid conveying pipeline (102) is communicated with the mixer inlet two (105); The chlorine absorption tower (12) is provided with an absorption tower outlet one (121) and an absorption tower outlet two (122), the outlet of the absorption tower outlet one (121) is communicated to the mixer inlet three (106) through a pipeline, and the outlet of the absorption tower outlet two (122) is communicated to the concentrated sodium hypochlorite storage tank (13) through a pipeline; The chlorine absorption tower (12) is further provided with an absorption tower inlet one (123) and an absorption tower inlet two (124), the absorption tower inlet one (123) is communicated with a liquid chlorine vaporizer (11) through a pipeline, and the inlet of the liquid chlorine vaporizer (11) is communicated with a liquid chlorine conveying pipeline (111) through a pipeline; The outlet of the alkali liquid mixer (10) is connected to the absorption tower inlet two (124) through a pipeline.

7. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 6, characterized in that, A pH on-line measuring instrument two (18) is further arranged on a pipeline between the absorption tower outlet two (122) and the concentrated sodium hypochlorite storage tank (13).

8. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 1, characterized in that, The outlet of the concentrated sodium hypochlorite tank (13) is communicated with a concentrated sodium hypochlorite pump (14) through a pipeline, and the outlet of the concentrated sodium hypochlorite pump (14) is communicated with a sodium hypochlorite mixer (15) through a pipeline.

9. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 1, characterized in that, The outlet of the sodium hypochlorite waste liquid collecting tank (5) is communicated with a sodium hypochlorite waste liquid cooling pump (6) through a pipeline, and the outlet of the sodium hypochlorite waste liquid cooling pump (6) is communicated with a sodium hypochlorite waste liquid cooling tower (8) through a pipeline; The outlet of the sodium hypochlorite waste liquid cooling tower (8) is communicated with a sodium hypochlorite waste liquid recycling pump (9) through a pipeline, and the outlet of the sodium hypochlorite waste liquid recycling pump (9) is communicated with the sodium hypochlorite mixer (15) through a pipeline; A branch pipeline two (801) is further arranged on the pipeline between the sodium hypochlorite waste liquid cooling tower (8) and the sodium hypochlorite waste liquid recycling pump (9), and the outlet of the branch pipeline two (801) is provided with a high-salt wastewater pump (19), and the outlet of the high-salt wastewater pump (19) is communicated with a G3 membrane system (300) through a pipeline.

10. The device for effectively controlling the pH value and available chlorine of sodium hypochlorite waste liquid according to claim 9, characterized in that, A pH on-line measuring instrument one (7) is arranged on the pipeline between the sodium hypochlorite waste liquid collecting tank (5) and the sodium hypochlorite waste liquid cooling pump (6).

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