CN214781567U - Low-energy-consumption efficient vinyl chloride rectification system - Google Patents
Low-energy-consumption efficient vinyl chloride rectification system Download PDFInfo
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- CN214781567U CN214781567U CN202120310587.1U CN202120310587U CN214781567U CN 214781567 U CN214781567 U CN 214781567U CN 202120310587 U CN202120310587 U CN 202120310587U CN 214781567 U CN214781567 U CN 214781567U
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Abstract
The utility model discloses a low energy consumption efficient chloroethylene rectification system, it includes at least one complete condenser, tail gas condenser, water separator and low tower condenser, the export of low tower condenser with the access connection of complete condenser. The utility model discloses arrange the top of the tower low boiling thing into low tower condenser condensation, the gaseous phase carries out the cooling with 5 ℃ water cooling through the full condenser A/B after the condensation again and introduces the tail gas condenser with-35 ℃ water and carries out cooling, on the one hand further reduced the high energy consumption of tail gas condenser, the amount of costly-35 ℃ cooling water, make full use of the low energy consumption in the system, the low-cost 5 ℃ water cooling vinyl chloride monomer, greatly reduced system energy consumption and manufacturing cost; on the other hand, fully retrieve vinyl chloride monomer, the vinyl chloride monomer that has significantly reduced gets into pressure swing adsorption, has solved pressure swing adsorption filler and has frozen stifled problem, guarantees pressure swing adsorption throughput, and then reduces vinyl chloride monomer content in the tail gas, and is more safe environmental protection.
Description
The technical field is as follows:
the utility model relates to a chloroethylene rectification system, in particular to a chloroethylene rectification system with low energy consumption and high efficiency.
Background art:
the production process of chloroethylene comprises mixing dehydration, synthesis conversion, water washing, alkali washing, compression and rectification. Specifically, the crude chloroethylene formed after mixed dehydration and synthetic conversion is subjected to mercury removal, then enters a three-in-one water washing combined tower, is subjected to alkaline washing to remove residual trace HCL, then enters a VC gas holder or is subjected to partial removal of entrained liquid by a pre-machine cooler, is pressurized by a compressor, is subjected to removal of entrained water and oil by a post-machine cooler, and is sent for rectification.
In the rectification process, crude chloroethylene is cooled by 5 ℃ water through a full condenser and then enters a low-boiling tower for rectification operation, low-boiling substances on the top of the low-boiling tower contain a large amount of chloroethylene monomers, in the traditional rectification process, the low-boiling substances on the top of the low-boiling tower enter a low-tower condenser for condensation, and a gas phase after condensation directly enters a tail gas condenser and is cooled by 35 ℃ below zero water. In actual production, in order to reduce the water consumption at the temperature of-35 ℃ and reduce energy consumption and production cost, the water phase valve of a tail gas condenser is small in opening, the operation can cause that the effect of condensing and recycling vinyl chloride monomers is not ideal, a large amount of vinyl chloride monomers enter pressure swing adsorption to cause frozen blockage of pressure swing adsorption filler, the processing capacity of pressure swing adsorption is reduced, vinyl chloride monomers in tail gas are increased, a large amount of vinyl chloride monomers in the tail gas are discharged into the air to pollute the environment, the risk of poisoning and suffocation of a large amount of vinyl chloride inhaled by personnel exists, and the waste of the vinyl chloride monomers is caused at the same time; in addition, the water at 5 ℃ in the system is not fully utilized, and the opening degree of a valve is small.
The utility model has the following contents:
in order to solve the technical problem, an object of the utility model is to provide a chloroethylene rectification system with low energy consumption, low cost and high-efficient recovery of chloroethylene monomer.
The utility model discloses by following technical scheme implement: a vinyl chloride rectification system with low energy consumption and high efficiency comprises at least one complete condenser, a tail gas condenser, a water separator and a low tower condenser, wherein the outlet end of an outlet pipe of the post-machine condenser is connected with the inlet of the complete condenser, and the non-condensable gas outlet of the complete condenser is connected with the inlet of the tail gas condenser; the liquid outlet of the full condenser is connected with the inlet of the water separator, the outlet of the water separator is connected with the inlet end of a low-boiling tower feeding pipe, the outlet end of a low-boiling substance discharging pipe at the top of the low-boiling tower is connected with the inlet of the low-boiling tower condenser, the outlet end of a cooling water upper water pipe is connected with the cooling water inlet of the full condenser, and a cooling water return port of the full condenser is connected with the inlet end of the cooling water return pipe; the outlet end of a water feeding pipe of the tail gas condenser is connected with a cooling water inlet of the tail gas condenser, and a cooling water return port of the tail gas condenser is connected with the inlet end of a return water pipe of the tail gas condenser; and a condensate outlet of the tail gas condenser is connected with an inlet of the water separator, and an outlet of the low-tower condenser is connected with an inlet of the full condenser.
Further, the low-energy-consumption high-efficiency vinyl chloride rectification system comprises two complete condensers, outlet ends of outlet pipes of the post condensers are respectively connected with inlets of the two complete condensers, and non-condensable gas outlets of the two complete condensers are respectively connected with an inlet of the tail gas condenser; liquid outlets of the two complete condensers are connected with an inlet of the water separator; the outlet ends of the cooling water upper water pipes are respectively connected with the cooling water inlets of the two complete condensers, and the cooling water return ports of the two complete condensers are connected with the inlet ends of the cooling water return pipes; the outlet of the low tower condenser is connected with the inlet of any one of the complete condensers.
Further, the outlet of the low tower condenser is connected with the inlet of the tail gas condenser, and when the system pressure is high, the condensed gas phase is temporarily introduced into the tail gas condenser for relieving the system pressure.
The utility model has the advantages that:
1. the utility model discloses arrange the top of the tower low boiling thing into low tower condenser condensation, the gaseous phase carries out the cooling with 5 ℃ water cooling through the full condenser A/B after the condensation again and introduces the tail gas condenser with-35 ℃ water and carries out cooling, on the one hand further reduced the high energy consumption of tail gas condenser, the amount of costly-35 ℃ cooling water, make full use of the low energy consumption in the system, the low-cost 5 ℃ water cooling vinyl chloride monomer, greatly reduced system energy consumption and manufacturing cost; on the other hand, the vinyl chloride monomer is fully recovered, the vinyl chloride monomer entering pressure swing adsorption is greatly reduced, the problem of freezing and blocking of pressure swing adsorption filler is solved, the pressure swing adsorption treatment capacity is ensured, the content of the vinyl chloride monomer in tail gas is further reduced, and the method is safer and more environment-friendly;
2. the whole condenser A/B is used in parallel, so that the utilization rate of equipment is improved;
3. vinyl chloride monomer entering the tail gas condenser is reduced, the icing rate of the inner wall of the tail gas condenser is reduced, and the service time of the tail gas condenser is prolonged; the switching rate of the tail gas condenser is reduced from the original 3 days/time to 5 days/time;
4. the gas phase of the low-tower condenser enters the full condenser, so that the top pressure of the low-boiling tower is reduced, and the production safety of the system is ensured.
Description of the drawings:
FIG. 1 is a schematic diagram of a vinyl chloride rectification system with low energy consumption and high efficiency.
A total condenser A1, a total condenser B2, a tail gas condenser 3, a water separator 4, a low-tower condenser 5, an outlet pipe 6 of a post-machine condenser, a feed pipe 7 of a low-boiling tower, a low-boiling tower top low-boiling substance discharge pipe 8, a cooling water upper water pipe 9, a cooling water return pipe 10, a tail gas condenser upper water pipe 11 and a tail gas condenser return pipe 12.
The specific implementation mode is as follows:
as shown in fig. 1, a low-energy-consumption high-efficiency vinyl chloride rectification system comprises a full condenser A1, a full condenser B2, a tail gas condenser 3, a water separator 4 and a low-tower condenser 5, wherein the outlet ends of an outlet pipe 6 of an after-machine condenser are respectively connected with the inlet of the full condenser A1 and the inlet of the full condenser B2, and the non-condensable gas outlet of the full condenser A1 and the non-condensable gas outlet of the full condenser B2 are both connected with the inlet of the tail gas condenser 3; the liquid discharge port of the full condenser A1 and the liquid discharge port of the full condenser B2 are both connected with the inlet of a water separator 4, the outlet of the water separator 4 is connected with the inlet end of a low-boiling tower feeding pipe 7, the outlet end of a low-boiling tower top low-boiling substance discharge pipe 8 is connected with the inlet of a low-boiling tower condenser 5, the outlet end of a cooling water upper water pipe 9 is respectively connected with the cooling water inlet of the full condenser A1 and the cooling water inlet of the full condenser B2, and the cooling water return port of the full condenser A1 and the cooling water return port of the full condenser B2 are both connected with the inlet ends of a cooling water return pipe 10; the outlet end of a tail gas condenser water feeding pipe 11 is connected with a cooling water inlet of a tail gas condenser 3, and a cooling water return port of the tail gas condenser 3 is connected with the inlet end of a tail gas condenser water return pipe 12; the condensate outlet of the tail gas condenser 3 is connected with the inlet of the water separator 4, and the outlet of the low-tower condenser 5 is connected with the inlet of the full condenser B2. The outlet of the low tower condenser 5 is connected with the inlet of the tail gas condenser 3, and when the system pressure is high, the condensed gas phase is temporarily introduced into the tail gas condenser 3 for relieving the system pressure.
The whole condensers A1 and B2 cool the vinyl chloride gas from the outlet of the after-cooler through the cooling water at the temperature of 5 ℃, and the cooled vinyl chloride enters the water separator 4 and is supplied to a low-boiling tower for use; after being cooled by the full condenser A1 and the full condenser B2, the non-condensable gas enters a tail gas condenser 3, and is cooled by cooling water at the temperature of minus 35 ℃, the condensed liquid enters a water separator 4, and the non-condensable gas enters pressure swing adsorption; the low-boiling-point substances on the top of the low-boiling-point tower are discharged into a low-tower condenser 5 for condensation, the condensed gas phase is cooled by 5 ℃ water through a full condenser B2 and then is introduced into a tail gas condenser 3, and the gas phase is cooled by-35 ℃ water, so that on one hand, the consumption of high-energy consumption and high-cost-35 ℃ cooling water in the tail gas condenser 3 is further reduced, the 5 ℃ water with low energy consumption and low cost in the system is fully utilized to cool the vinyl chloride monomer, and the energy consumption and the production cost of the system are greatly reduced; on the other hand, fully retrieve vinyl chloride monomer, the vinyl chloride monomer that has significantly reduced gets into pressure swing adsorption, has solved pressure swing adsorption filler and has frozen stifled problem, guarantees pressure swing adsorption throughput, and then reduces vinyl chloride monomer content in the tail gas, and is more safe environmental protection.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A vinyl chloride rectification system with low energy consumption and high efficiency comprises at least one complete condenser, a tail gas condenser, a water separator and a low tower condenser, wherein the outlet end of an outlet pipe of the post-machine condenser is connected with the inlet of the complete condenser, and the non-condensable gas outlet of the complete condenser is connected with the inlet of the tail gas condenser; the liquid outlet of the full condenser is connected with the inlet of the water separator, the outlet of the water separator is connected with the inlet end of a low-boiling tower feeding pipe, the outlet end of a low-boiling substance discharging pipe at the top of the low-boiling tower is connected with the inlet of the low-boiling tower condenser, the outlet end of a cooling water upper water pipe is connected with the cooling water inlet of the full condenser, and a cooling water return port of the full condenser is connected with the inlet end of the cooling water return pipe; the outlet end of a water feeding pipe of the tail gas condenser is connected with a cooling water inlet of the tail gas condenser, and a cooling water return port of the tail gas condenser is connected with the inlet end of a return water pipe of the tail gas condenser; and a condensate outlet of the tail gas condenser is connected with an inlet of the water separator, and the outlet of the low-tower condenser is connected with an inlet of the complete condenser.
2. A low energy consumption high efficiency vinyl chloride rectification system as claimed in claim 1 including two complete condensers, outlet ends of outlet pipes of post condensers are respectively connected with inlets of the two complete condensers, and non-condensable gas outlets of the two complete condensers are both connected with an inlet of said tail gas condenser; liquid outlets of the two complete condensers are connected with an inlet of the water separator; the outlet ends of the cooling water upper water pipes are respectively connected with the cooling water inlets of the two complete condensers, and the cooling water return ports of the two complete condensers are connected with the inlet ends of the cooling water return pipes; the outlet of the low tower condenser is connected with the inlet of any one of the complete condensers.
3. A low energy consumption and high efficiency vinyl chloride rectification system as claimed in claim 1 or claim 2 wherein the outlet of said lower column condenser is connected to the inlet of said off-gas condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120310587.1U CN214781567U (en) | 2021-02-03 | 2021-02-03 | Low-energy-consumption efficient vinyl chloride rectification system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120310587.1U CN214781567U (en) | 2021-02-03 | 2021-02-03 | Low-energy-consumption efficient vinyl chloride rectification system |
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| CN214781567U true CN214781567U (en) | 2021-11-19 |
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| CN202120310587.1U Active CN214781567U (en) | 2021-02-03 | 2021-02-03 | Low-energy-consumption efficient vinyl chloride rectification system |
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