CN217341203U - A preliminary treatment proportioning device for propane system propylene waste lye - Google Patents
A preliminary treatment proportioning device for propane system propylene waste lye Download PDFInfo
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- CN217341203U CN217341203U CN202220663371.8U CN202220663371U CN217341203U CN 217341203 U CN217341203 U CN 217341203U CN 202220663371 U CN202220663371 U CN 202220663371U CN 217341203 U CN217341203 U CN 217341203U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Abstract
The utility model discloses a preliminary treatment proportioning device for propane system propylene waste lye. The method of the utility model comprises the following steps: the liquid level monitor is arranged in the proportioning tank; the alkali liquor tank is connected with the proportioning tank through a pipeline with an alkali liquor delivery pump; the industrial water pipe is provided with an adjusting valve and is connected with the proportioning tank through a pipeline; the device comprises a waste alkali liquor conveying pipeline and a waste alkali liquor conveying pump, wherein the waste alkali liquor conveying pipeline is provided with the waste alkali liquor conveying pump and is connected with a proportioning tank through a pipeline; and the outlet pump is connected with the proportioning tank through a pipeline. The utility model discloses can adjust solute content and COD in the waste lye before carrying out the oxidation reaction, avoid the corruption to equipment, improve the treatment effeciency.
Description
Technical Field
The utility model discloses chemical industry equipment technical field, concretely relates to a preliminary treatment proportioning device for propane system propylene waste lye.
Background
Propylene is one of petrochemical basic raw materials, and can be used for producing various important organic chemical raw materials, such as acrylonitrile, propylene oxide, cumene and the like; in the refining industry, the raw material for preparing the laminated gasoline is used; synthetic resins, synthetic fibers, synthetic rubbers, various fine chemicals, and the like can also be produced.
Chemical plants usually adopt the catalytic dehydrogenation of propane to produce propylene, and specifically, the dehydrogenation reaction of raw materials containing propane after treatment generates main product propylene and also generates H 2 S，CO 2 Waiting for acid gas, and absorbing the acid gas by NaOH solution to generate Na-rich gas 2 S, NaHS, the waste lye containing a small amount of hydrocarbon compounds has bad odor, is a high concentration organic pollutant which can not be biochemical, and can cause serious harm to the surrounding water and atmosphere if directly discharged without treatment, therefore, the treatment method of the waste lye by adopting a high temperature wet oxidation method is that Na in the waste lye is treated by taking air as an oxidant in a liquid system under the conditions of high temperature and high pressure 2 Fully oxidizing S, NaHS and partial hydrocarbon compounds into Na 2 SO 4 ，CO 2 ，H 2 O and the like, and the oxidized waste alkali liquor is deodorized and has biodegradability;
in the prior art, the waste alkali liquor is treated by a high-temperature wet oxidation method, and the waste alkali liquor contains NaHS, so that the waste alkali liquor is easily oxidized into acid, equipment is corroded, and unnecessary cost waste is caused; and sodium sulfide and sodium hydrosulfide concentration in the waste alkali solution are higher, and then COD is high, if the oxidation back, the sodium sulfate concentration that generates also can be very high, because the solubility of sodium sulfate is lower, the sodium sulfate that is appeared leads to the pipeline to block up easily, consumes artifical clearance time, reduces treatment effeciency.
In order to solve the technical problem, the utility model provides a preliminary treatment proportioning device for propane system propylene waste lye.
Disclosure of Invention
The utility model aims at overcoming prior art's is not enough, provides a preliminary treatment proportioning device for propane system propylene waste lye, can adjust solute content and COD in the waste lye before carrying out oxidation reaction, avoids the corruption to equipment, improves the treatment effeciency.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a pretreatment proportioning device for propane-prepared propylene waste lye comprises the following parts:
the liquid level monitor is arranged on the proportioning tank;
the alkali liquor tank is connected with the proportioning tank through a pipeline with an alkali liquor delivery pump; the alkali liquor tank conveys alkali liquor into the proportioning tank through an alkali liquor conveying pump;
the industrial water pipe is provided with an adjusting valve and is connected with the proportioning tank through a pipeline; the industrial water pipe conveys industrial water into the proportioning tank through the regulating valve;
the device comprises a waste alkali liquor conveying pipeline and a waste alkali liquor conveying pump, wherein the waste alkali liquor conveying pipeline is provided with the waste alkali liquor conveying pump and is connected with a proportioning tank through a pipeline; the waste alkali liquor conveying pump conveys the waste alkali liquor in the waste alkali liquor conveying pipeline to the proportioning tank;
and the outlet pump is connected with the proportioning tank through a pipeline.
Preferably, the proportioning tank is provided with two output pipes, the first output pipe is arranged on the upper side of the proportioning tank, and the second output pipe is arranged on the lower side of the proportioning tank, so that the discharging speed can be increased.
Preferably, the alkali liquor conveying pumps are two, and when the first alkali liquor conveying pump works, the second alkali liquor conveying pump is standby, and vice versa.
Preferably, two waste lye delivery pumps are arranged, and when the first waste lye delivery pump works, the second waste lye delivery pump is standby, and vice versa.
Preferably, the proportioning tank is provided with a nozzle or a rotational flow device at the inlet of the alkali liquor, the waste alkali liquor and the industrial water to ensure the mixed liquor to be fully mixed.
Preferably, a high-speed stirrer is arranged in the proportioning tank, so that the mixed liquid is fully mixed.
Preferably, an interlocking control line is arranged between the liquid level monitor and the outlet pump, and when the liquid level detected by the liquid level monitor reaches 60-80%, the outlet pump is started in an interlocking manner.
Preferably, the system also comprises a DCS (distributed control system), namely a distributed control system, wherein the DCS is arranged among the alkali liquor conveying pump, the waste alkali liquor conveying pump, the regulating valve and the outlet pump, the sum of the alkali liquor flow, the waste alkali liquor flow and the industrial water quantity is in linkage control with the discharge quantity of the outlet pump, meanwhile, the ratio of the waste alkali liquor to the alkali liquor is in linkage control with the discharge quantity of the alkali liquor pump, the waste alkali liquor flow is input, and the alkali liquor flow is naturally obtained through the ratio.
Preferably, the waste alkali liquor conveying pipeline is provided with a sampling port for COD and Na in the waste alkali liquor 2 S, NaHS, total alkalinity, chloride ion and density, according to COD and Na 2 S, NaHS, total alkalinity, chloride ions and density to calculate the proportion of waste lye, lye and water and the flow rate.
Specifically, the method comprises the following steps: the chemical equation is: HS - +OH - →S 2 - +H 2 O；
The content of sodium hydrosulfide in the waste alkali liquor can be obtained by detecting the waste alkali liquor, and the sodium hydroxide with the same amount reacts with the sodium hydrosulfide to be converted into sodium sulfide and water; thus obtaining the addition amount and flow rate of the alkali liquor;
COD, i.e. chemical oxygen demand, refers to the amount of oxidant consumed when a water sample is treated with a certain strong oxidant under certain conditions; the degree of pollution of the water by substances is reflected, and the larger the chemical oxygen demand is, the more serious the pollution of the water by organic matters is;
and (3) detecting the obtained COD, and diluting with a certain amount of industrial water according to a corresponding standard value to enable the COD to reach the corresponding standard value.
Specifically, the device for preparing propylene by propane dehydrogenation absorbs H in product gas by using NaOH solution in the production process 2 S，CO 2 Iso-acidic gas to generate Na-rich gas 2 S, NaHS, sampling and analyzing a small amount of waste alkali liquid of hydrocarbon compounds when the waste alkali liquid from the alkaline washing tower passes through a waste alkali liquid conveying pipeline, and calculating the proportion and flow rate of the waste alkali liquid, the alkali liquid and the water;
according to the calculated proportion and flow, the waste alkali liquor is input into the proportioning tank through a waste alkali liquor conveying pump, the alkali liquor is input into the proportioning tank through an alkali liquor conveying pump, and the industrial water is input into the proportioning tank through an adjusting valve and is mixed and stirred in the proportioning tank;
when the liquid level detected by the liquid level monitor reaches 60-80%, the outlet pump is started in a linkage manner;
meanwhile, the DCS system sums the flow of the waste alkali liquor, the alkali liquor and the industrial water and controls the flow of the outlet pump, so that the liquid level in the proportioning tank is reasonably controlled;
when the proportion and the flow of the waste alkali liquid, the alkali liquid and the water are calculated, the flow of the alkali liquid is automatically input only by inputting the ratio of the waste alkali liquid to the alkali liquid and the flow of the waste alkali liquid.
The utility model has the advantages that:
by adopting the scheme, the utility model can pretreat the propane-prepared propylene waste alkali liquor, re-match the pre-treated propane-prepared propylene waste alkali liquor, adjust the solute content and COD in the waste alkali liquor before the oxidation reaction, avoid the corrosion to the equipment and improve the treatment efficiency; and the waste alkali liquor, the alkali liquor and the industrial water are fully mixed, the efficiency is higher, and the high-temperature oxidation reaction in the later period is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a flow chart of the apparatus of the present invention.
In the figure, 1-proportioning tank, 2-lye tank, 3-lye delivery pump, 4-industrial water pipe, 5-waste lye delivery pump, 6-waste lye delivery pipeline, 7-outlet pump, 8-liquid level monitor, 9-first output pipe, 10-second output pipe.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
As shown in figure 1, a pretreatment proportioning device for waste lye of propylene preparation by propane comprises the following parts:
the liquid level monitoring device comprises a proportioning tank 1 and a liquid level monitor 8, wherein the liquid level monitor 8 is arranged on the proportioning tank 1;
the alkali liquor tank 2 is connected with the proportioning tank 1 through a pipeline with the alkali liquor delivery pump 3; the alkali liquor tank 2 conveys alkali liquor into the proportioning tank 1 through an alkali liquor conveying pump 3;
the industrial water pipe 4 is provided with an adjusting valve and is connected with the proportioning tank 1 through a pipeline; the industrial water pipe 4 conveys industrial water into the proportioning tank 1 through a regulating valve;
the device comprises a waste alkali liquor conveying pipeline 6 and a waste alkali liquor conveying pump 5, wherein the waste alkali liquor conveying pipeline 6 is provided with the waste alkali liquor conveying pump 5 and is connected with the proportioning tank 1 through a pipeline; the waste alkali liquor conveying pump 5 conveys the waste alkali liquor in the waste alkali liquor conveying pipeline 6 to the proportioning tank 1;
and the outlet pump 7 is connected with the proportioning tank 1 through a pipeline.
Preferably, ratio jar 1 is equipped with two output tubes, and first output tube 9 is established at ratio jar 1 upside, and second output tube 10 is established at ratio jar 1 downside, can improve ejection of compact speed like this.
Preferably, two lye delivery pumps 3 are provided, and when the first lye delivery pump works, the second lye delivery pump is standby, and vice versa.
Preferably, two waste lye delivery pumps 3 are arranged, and when the first waste lye delivery pump works, the second waste lye delivery pump is standby, and vice versa.
Preferably, the proportioning tank 1 is provided with a nozzle or a rotational flow device at the inlet of the alkali liquor, the waste alkali liquor and the industrial water to ensure the mixed liquor to be fully mixed.
Preferably, a high-speed stirrer is arranged in the proportioning tank 1, so that the mixed solution is fully mixed.
Preferably, an interlocking control line is arranged between the liquid level monitor 8 and the outlet pump 7, and when the liquid level detected by the liquid level monitor 8 reaches 60-80%, the outlet pump 7 is started in an interlocking manner.
Preferably, the system also comprises a DCS (distributed control system), namely a distributed control system, wherein the DCS is arranged among the alkali liquor conveying pump, the waste alkali liquor conveying pump, the regulating valve and the outlet pump, the sum of the alkali liquor flow, the waste alkali liquor flow and the industrial water quantity is in linkage control with the discharge quantity of the outlet pump, meanwhile, the ratio of the waste alkali liquor to the alkali liquor is in linkage control with the discharge quantity of the alkali liquor pump, the waste alkali liquor flow is input, and the alkali liquor flow is naturally obtained through the ratio.
Preferably, the waste alkali liquor conveying pipeline 6 is provided with a sampling port for COD and Na in the waste alkali liquor 2 S, NaHS, total alkalinity, chloride ion and density, according to COD and Na 2 S, NaHS, total alkalinity, chloride ions and density to calculate the ratio of waste lye to water and the flow rate.
In particular toAnd the device for preparing propylene by propane dehydrogenation absorbs H in product gas by using NaOH solution in the production process 2 S，CO 2 Iso-acidic gas to generate Na-rich gas 2 S, NaHS, sampling and analyzing a small amount of waste alkali liquid of hydrocarbon compounds when the waste alkali liquid from the alkaline washing tower passes through the waste alkali liquid conveying pipeline 6, and calculating the proportion and flow rate of the waste alkali liquid, the alkali liquid and the water;
according to the calculated proportion and flow, the waste alkali liquor is input into the proportioning tank 1 through the waste alkali liquor delivery pump 3, the alkali liquor is input into the proportioning tank 1 through the alkali liquor delivery pump 3, and the industrial water is input into the proportioning tank 1 through the regulating valve and is mixed and stirred in the proportioning tank 1;
when the liquid level detected by the liquid level monitor 8 reaches 60-80%, the outlet pump 7 is started in a linkage manner;
meanwhile, the DCS system controls the flow of the outlet pump 7 by totaling the flow of the waste alkali liquor, the alkali liquor and the industrial water, so that the liquid level in the proportioning tank 1 is reasonably controlled;
when the proportion and the flow of the waste alkali liquid, the alkali liquid and the water are calculated, the flow of the alkali liquid is automatically input only by inputting the ratio of the waste alkali liquid to the alkali liquid and the flow of the waste alkali liquid.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A pretreatment proportioning device for propane-prepared propylene waste lye is characterized in that: the method comprises the following steps:
the liquid level monitor is arranged on the proportioning tank;
the alkali liquor tank is connected with the proportioning tank through a pipeline with an alkali liquor delivery pump;
the industrial water pipe is provided with an adjusting valve and is connected with the proportioning tank;
the waste alkali liquor conveying pipeline is provided with a waste alkali liquor conveying pump and is connected with the proportioning tank;
and the outlet pump is connected with the proportioning tank through a pipeline.
2. The pretreatment proportioning device of claim 1, wherein: the ratio jar is equipped with two output tubes, and first output tube is established at ratio jar upside, and the second output tube is established at ratio jar downside.
3. The pretreatment proportioning device of claim 1, wherein: the alkali liquor conveying pumps are arranged in two.
4. The pretreatment proportioning device of claim 1, wherein: the two waste alkali liquor delivery pumps are arranged.
5. The pretreatment proportioning device of claim 1, wherein: the proportioning tank is provided with a nozzle or a rotational flow device at an inlet.
6. The pretreatment proportioning device of claim 1, wherein: and a high-speed stirrer is arranged in the proportioning tank.
7. The pretreatment proportioning device of claim 1, wherein: and an interlocking control line is arranged between the liquid level monitor and the outlet pump.
8. The pretreatment proportioning device of claim 1, wherein: and a sampling port is arranged on the waste alkali liquor conveying pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220663371.8U CN217341203U (en) | 2022-03-25 | 2022-03-25 | A preliminary treatment proportioning device for propane system propylene waste lye |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220663371.8U CN217341203U (en) | 2022-03-25 | 2022-03-25 | A preliminary treatment proportioning device for propane system propylene waste lye |
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| Publication Number | Publication Date |
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| CN217341203U true CN217341203U (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220663371.8U Active CN217341203U (en) | 2022-03-25 | 2022-03-25 | A preliminary treatment proportioning device for propane system propylene waste lye |
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| CN (1) | CN217341203U (en) |
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- 2022-03-25 CN CN202220663371.8U patent/CN217341203U/en active Active
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