CN114432982A - Device and method for by-producing medium-pressure steam in vinyl chloride synthesis system - Google Patents
Device and method for by-producing medium-pressure steam in vinyl chloride synthesis system Download PDFInfo
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- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 86
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 74
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 224
- 230000001105 regulatory effect Effects 0.000 claims abstract description 43
- 239000006227 byproduct Substances 0.000 claims abstract description 15
- 239000013505 freshwater Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000012495 reaction gas Substances 0.000 claims abstract description 4
- 239000000498 cooling water Substances 0.000 claims description 65
- 239000007788 liquid Substances 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 239000003054 catalyst Substances 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 7
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 239000013589 supplement Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000003595 mist Substances 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000008234 soft water Substances 0.000 claims description 3
- 238000000859 sublimation Methods 0.000 claims description 3
- 230000008022 sublimation Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 4
- 230000008016 vaporization Effects 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 3
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005008 domestic process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000006276 transfer reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/24—Stationary reactors without moving elements inside
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/24—Stationary reactors without moving elements inside
- B01J19/2415—Tubular reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D1/00—Devices using naturally cold air or cold water
- F25D1/02—Devices using naturally cold air or cold water using naturally cold water, e.g. household tap water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00002—Chemical plants
- B01J2219/00004—Scale aspects
- B01J2219/00006—Large-scale industrial plants
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Abstract
The invention discloses a device for producing medium-pressure steam as a byproduct of a vinyl chloride synthesis system, wherein a water outlet of a synthesis reactor is connected with a flash tank, a water inlet of the synthesis reactor is connected with a booster pump, and a reaction gas outlet of the synthesis reactor is connected with a heat exchanger; the water outlet of the flash tank is respectively connected with the booster pump and the hot water pump, and the steam outlet of the flash tank is connected with the water vapor compressor; the water vapor compressor is connected with a steam user; the hot water pump is connected with a hot water user through a pipeline; one end of the pipeline heater is connected with the condensate pump, and the other end of the pipeline heater is connected with the booster pump through the first automatic regulating valve; the condensed water storage tank is provided with a water replenishing valve and is connected with a condensed water pump; a fresh water valve is arranged at a water inlet of the heat exchanger, and a water outlet of the heat exchanger is connected with a condensed water storage tank through a pipeline. The device and the method for producing the byproduct medium-pressure steam in the vinyl chloride synthesis system can simultaneously and accurately control the temperature of the vinyl chloride synthesis reactor and produce the medium-pressure steam, and realize the improvement of product yield and the recycling of heat energy.
Description
Technical Field
The invention relates to a device and a method for generating medium-pressure steam as a byproduct in a vinyl chloride synthesis system, and belongs to the technical field of polyvinyl chloride byproducts.
Background
In the production process of polyvinyl chloride in China, a large amount of acetylene gas and hydrogen chloride gas are needed to synthesize vinyl chloride gas, so that a large amount of heat is generated in the process of synthesizing vinyl chloride by using acetylene gas and hydrogen chloride gas: CH is equivalent to CH + HCl → CH2 is CHCl +124.8kJ/mol (29.8kcal/mol), and the yield of the polyvinyl chloride is 100 ten thousand tons/year, and the consumption of the coal is 147692 tons converted into steam and coal produced by a boiler.
For the heat energy recycling of vinyl chloride synthesis, the domestic main treatment mode is that cooling water temperature difference is used as a power source, cooling water of each reactor is closed and self-circulated, the process is easy to cause that the upper part of each reactor is filled with water vapor, the temperature of each reactor is not uniform and adjustable, the chemical reaction intensity of the reaction side is limited, and the obtained water vapor is naturally vaporized and cannot be used by lower-end users; one is to install a circulating cooling water storage tank and a cooling water heat exchanger, and a cooling water tower takes away cooling water heat, so that the energy consumption is large. At present, the domestic method mainly comprises the following steps: one method is to utilize a lithium bromide process, the early investment is large, and the operation effect industry has poor reverberation; the low-quality water vapor is directly vaporized, and has the advantages of less use and low utilization rate.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the invention provides a device and a method for producing medium-pressure steam as a byproduct of a vinyl chloride synthesis system, which can simultaneously and accurately control the temperature of a vinyl chloride synthesis reactor and produce the medium-pressure steam, and realize the improvement of product yield and the recycling of heat energy.
The technical scheme adopted by the invention is as follows:
a device for producing medium-pressure steam as a byproduct of a chloroethylene synthesis system comprises a synthesis reactor, a flash tank, a steam compressor, a booster pump, a hot water pump, a pipeline heater, a cooling water supplement system, a condensed water storage tank, a condensed water pump and a heat exchanger;
the water outlet of the synthesis reactor is connected with the flash tank, the water inlet of the synthesis reactor is connected with the booster pump, and the reaction gas outlet of the synthesis reactor is connected with the heat exchanger;
the water outlet of the flash tank is respectively connected with the booster pump and the hot water pump, and the steam outlet of the flash tank is connected with the water vapor compressor;
the steam compressor is connected with a steam user, the steam user is connected with a steam trap, and the steam trap is connected with a condensed water storage tank;
the hot water pump is connected with a hot water user through a pipeline, and the hot water user is connected with the condensed water storage tank;
one end of the pipeline heater is connected with a condensate pump, the other end of the pipeline heater is connected with a water inlet of the booster pump through a first automatic regulating valve, and the pipeline heater is connected with a steam regulating valve through a temperature controller;
the condensed water storage tank is provided with a water replenishing valve, and a water outlet of the condensed water storage tank is connected with a condensed water pump;
a fresh water valve is arranged at a water inlet of the heat exchanger, and a water outlet of the heat exchanger is connected with a condensed water storage tank through a pipeline.
The present invention has: 1. a cooling water circulation system: the booster pump is connected with the chloroethylene synthesis reactor through a pipeline; the chloroethylene synthesis reactor is connected with the flash tank through a pipeline; the flash tank is connected with the booster pump through a pipeline; 2. a water vapor system: the flash tank is connected with a water vapor compressor through a pipeline, and the water vapor compressor is connected with a steam user through a pipeline; the steam consumer passes through the pipeline to be connected with the steam trap, and the steam trap passes through the pipeline to be connected with the comdenstion water storage tank, and the comdenstion water storage tank passes through the pipeline to be connected with condensate pump, and the condensate pump passes through the pipeline to be connected with pipe heater, and pipe heater passes through the pipeline to be connected with first automatically regulated valve, and first automatically regulated valve passes through governing valve, pipeline and the access connection of booster pump, and the booster pump passes through the pipeline to be connected with the flash tank. 3. A hot water system: the flash tank passes through the pipeline to be connected with the hot-water pump, and the hot-water pump passes through the pipeline to be connected with hot water user, and hot water user passes through the pipeline to be connected with the comdenstion water storage tank, merges cooling water circulation system into, and 4, heat exchanger water side pass through the pipeline to be connected with the comdenstion water storage tank, merges cooling water circulation system through the condensate pump, and the heat exchanger material side passes through the pipeline to be connected with the synthesis reactor. The device and the method for producing the medium-pressure steam as the byproduct of the vinyl chloride synthesis system can recover and convert the thermal limit of the chemical reaction into the medium-pressure steam for output, and accurately control the reaction temperature of the vinyl chloride synthesis reactor.
In the invention, reaction heat energy is removed from a synthesis reactor through forced large flow of cooling water, the pressure in a flash tank is regulated by a steam compressor, the pressure in the flash tank determines the vaporization intensity of the cooling water, the vaporization intensity of the cooling water determines the temperature of the cooling water, the temperature of the cooling water determines the temperature of the synthesis reactor, and medium-pressure steam is byproduct at the outlet of the steam compressor. And a steam compressor, wherein the pressure in the flash tank can be adjusted, and the pressurized steam is discharged, so that the temperature rise of the pressurized steam is 65-70 ℃.
Preferably, the synthesis reactor is of a tube-in-tube heat exchanger type, and one side of each tube is subjected to gas phase synthesis reaction to release heat; and the other side of the tube array adopts cooling water to transfer reaction heat.
Preferably, a baffle is arranged on the cooling water side of the synthesis reactor, the cooling water side is divided into three sections which are not communicated with each other, and each section is provided with a water inlet and a water outlet.
In the scheme, the cooling water is respectively introduced into the three sections, so that the flow rate of the cooling water can be controlled more easily, and the reaction temperature can be controlled.
Preferably, a silk screen mist eliminator positioned above the water inlet is arranged in the flash tank, a manual emptying valve, an automatic emptying valve, a first pressure controller, a first liquid level controller and a temperature sensor are arranged on the flash tank, the automatic emptying valve is interlocked with the first pressure controller, the first pressure controller is interlocked with the water vapor compressor, and the first liquid level controller is interlocked with the automatic regulating valve.
In the scheme, the liquid level of the flash tank is controlled by a first liquid level controller; controlling the pressure in the water vapor compressor by a first pressure controller; by arranging the automatic emptying valve which is interlocked with the first pressure controller, the automatic emptying valve can be emptied in time when the pressure in a fault tank of the water vapor compressor exceeds a set value, so that the temperature of cooling water is prevented from being rapidly increased to sublimate a catalyst in a synthesis reactor; by arranging the wire mesh catcher, liquid drops are prevented from being sucked into the water vapor compressor, the high-temperature corrosion inhibitor is prevented from entering the water vapor compressor, and the service life of the high-temperature corrosion inhibitor is prolonged.
Preferably, the first automatic regulating valve is connected with the automatic return valve through a first liquid level controller, the automatic return valve is connected with the condensed water storage tank, and the first automatic regulating valve and the automatic return valve are opposite in switch.
In the above scheme, the liquid level height of the flash tank is controlled.
Preferably, the driving motor of the water vapor compressor is controlled by a frequency converter, a second pressure controller, a flow sensor and a temperature sensor are arranged at the outlet of the water vapor compressor, and the second pressure controller is interlocked with the second automatic regulating valve.
In the scheme, the back pressure of the water vapor compressor is ensured, and the reverse series of system materials is prevented.
Preferably, the outlet of the booster pump is provided with a pressure sensor.
Preferably, the hot water user is a vinyl chloride synthesis reaction material.
Preferably, a water outlet of the condensate pump is provided with a flow sensor, and the condensate pump is connected with a condensate storage tank through an automatic return valve.
Preferably, the condensate storage tank is normally in a closed state.
In the scheme, the oxygen content of the circulating cooling water is reduced, and the corrosion speed of the reactor is slowed down.
Preferably, the water replenishing valve is interlocked with a second liquid level controller arranged in the condensed water storage tank.
In the scheme, the stable liquid level of the circulating cold water is ensured, and the synthesis reactor is prevented from being dried and burned due to water shortage.
Preferably, the equipment and pipelines in the device are subjected to heat preservation treatment.
In the scheme, the heat preservation treatment is carried out on the equipment and the pipeline, so that the heat energy radiation loss and the damage of heat radiation to the building can be reduced.
A method for producing medium-pressure steam as a byproduct in a vinyl chloride synthesis system comprises the following steps:
the method comprises the following steps: opening a water replenishing valve to replenish cooling water for the condensed water storage tank, and controlling the liquid level of the condensed water storage tank by interlocking the water replenishing valve and a second liquid level controller;
step two: pumping water from the condensate storage tank to the pipeline heater through the condensate pump;
step three: starting a steam regulating valve to heat water in the pipeline heater, controlling the water temperature by interlocking the steam regulating valve with a temperature controller, and removing the interlocking of the steam regulating valve and the temperature controller in normal operation;
step four: opening an inlet and outlet valve of a booster pump and an inlet and outlet valve of a synthesis reactor, allowing high-temperature water of a pipeline heater to flow to the synthesis reactor through a first automatic regulating valve and the booster pump and then flow to a flash tank, wherein the first automatic regulating valve, the automatic reflux valve and a first liquid level controller are interlocked to control the liquid level of the flash tank, and the first automatic regulating valve and the automatic reflux valve are opposite in switch;
step five: when the liquid level of the flash tank reaches a set value, starting a booster pump;
step six: starting a hot water pump to convey high-temperature water in the flash tank to a hot water user for preheating chloroethylene synthesis reaction materials, and then returning the high-temperature water to a condensed water storage tank for circulation;
step seven: opening a material valve of the synthesis reactor, carrying out vinyl chloride synthesis reaction to release heat energy, cooling water provided by a booster pump carries out cooling heat exchange on the material valve, and returning the water after heat exchange to the flash tank through a pipeline for circulation;
step eight: when the pressure of the flash tank reaches a set value, starting a water vapor compressor to provide high-temperature steam for a steam user, returning the steam to a condensate water storage tank for circulation through a steam trap after the steam compressor is used, and controlling the pressure in the flash tank by interlocking the water vapor compressor and a pressure controller;
step nine: and opening a fresh water valve, introducing fresh soft water into the heat exchanger to exchange heat with the vinyl chloride gas, and allowing the water after heat exchange to enter a condensed water storage tank for circulation.
In the invention, the cooling water after flash evaporation is used for circularly cooling the synthesis reactor through a booster pump and/or a thermal siphon effect.
Preferably, in the third step, the pressure of the high-temperature cooling water is supplemented to be 0.3-0.4 MPa, the temperature is 88-90 ℃, and the flow is 12-15 m3/h, so that the water level can reach 45-55% of the liquid level of the flash tank, and the material is preheated to the required temperature for reaction.
Preferably, in the fifth step, the temperature of the cooling water in the first operation is 88-90 ℃, the cooling water is used for preheating the synthesis reactor and plays a role of activating the catalyst, and the flow rate of the circulating cooling water is more than 40m3/h, so that the reaction heat is ensured to be removed in time.
Preferably, in the fifth step, the temperature of the cooling water during normal operation is 100-102 ℃, the sublimation failure of the catalyst at the reaction side of the synthesis reactor is prevented, and the flow rate of the circulating cooling water is more than 40m3/h, so that the reaction heat is ensured to be removed in time.
Preferably, in the fifth step, the lift of the booster pump is 11-15 m so as to ensure the circulation of cooling water.
Preferably, in the step eight, the vaporization area of the flash tank is 1.2-1.5 times of the calculated area, so that the economic operation of the steam compressor is ensured.
Preferably, in the step eight, the pressure in the flash tank is kept at 2-5 KPa so as to achieve the evaporation intensity at a certain flash evaporation area and ensure that the heat in the circulating cooling water is taken away in time; the liquid level in the flash tank is kept between 50 and 60 percent, and the temperature of the synthesis reactor is prevented from being uncontrolled due to unstable flow of circulating cooling water.
Preferably, in the eighth step, the water vapor compressor has an automatic energy level adjustment function of 70% -100%, so as to ensure that the pressure in the flash tank can be changed as required, thereby controlling the temperature of the cooling water and further achieving the optimal reaction temperature of the vinyl chloride synthesis reactor.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the temperature of the synthesis reactor can be accurately controlled, and the synthesis reaction efficiency can be optimal;
2. reaction heat can be transferred to low-quality steam to the maximum extent, and the low-quality steam can be pressurized, so that the efficiency of a steam compressor is improved;
3. the pressurized steam can be directly sent to a rear-end steam user to replace the steam produced by the existing boiler, and the carbon emission is reduced.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a process flow diagram of an apparatus;
figure 2 is a schematic diagram of a synthesis reactor.
The labels in the figure are: r01-synthesis reactor, P01-booster pump, P02-hot water pump, P03-condensate pump, E01-flash tank, E02-steam user, E03-hot water user, E04-heat exchanger, B01-steam heater, C01-steam compressor, V01-condensate storage tank, 1-wire mist trap, 2-automatic emptying valve, 3-first pressure controller, 4-first liquid level controller, 5-second pressure controller, 6-second automatic regulating valve, 7-water replenishing valve, 8-second liquid level controller, 9-first automatic regulating valve, 10-automatic return valve, 11-fresh water valve, 12-steam regulating valve, 13-temperature controller, 14-baffle, 15-water inlet of synthesis reactor, 16-water outlet of the synthesis reactor.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1-2, the apparatus for by-producing medium-pressure steam in a vinyl chloride synthesis system of this embodiment includes a synthesis reactor R01, a flash tank E01, a steam compressor C01, a booster pump P01, a hot water pump P02, a pipeline heater, a cooling water supplement system, a condensed water storage tank V01, a condensed water pump P03, and a heat exchanger E04;
the synthesis reactor R01 is a tubular heat exchanger E04 type, and one side of the tubular heat exchanger carries out synthesis reaction in a gas phase to release heat; the other side of the tube array is provided with a baffle 14, the cooling water side is divided into three sections which are not communicated with each other, and each section is provided with a water inlet and a water outlet; a water outlet 16 of the synthesis reactor is connected with a flash tank E01, a water inlet 15 of the synthesis reactor is connected with a booster pump P01, a reaction gas outlet of the synthesis reactor R01 is connected with a heat exchanger E04, and a water outlet 16 of the synthesis reactor is provided with a temperature sensor and a flow sensor;
a silk screen mist eliminator 1 positioned above a water inlet is arranged in the flash tank E01, a manual emptying valve, an automatic emptying valve 2, a first pressure controller 3, a first liquid level controller 4 and a temperature sensor are arranged on the flash tank E01, the automatic emptying valve 2 is interlocked with the first pressure controller 3, the first pressure controller 3 is interlocked with the water vapor compressor C01, and the first liquid level controller 4 is interlocked with an automatic regulating valve; a water outlet of the flash tank E01 is respectively connected with a booster pump P01 and a hot water pump P02, and a steam outlet of the flash tank E01 is connected with a water vapor compressor C01;
a driving motor of the water vapor compressor C01 is controlled by a frequency converter, a second pressure controller 5, a flow sensor and a temperature sensor are arranged at the outlet of the water vapor compressor C01, and the second pressure controller 5 is interlocked with the second automatic regulating valve 6; the water vapor compressor C01 is connected with a steam user E02, the steam user E02 is connected with a steam trap, and the steam trap is connected with a condensate water storage tank V01; interlocking the water vapor compressor C01 with a pressure controller to control the pressure in the flash tank E01;
the hot water pump P02 is connected with a hot water user E03 through a pipeline, a temperature sensor and a flow sensor are arranged at the outlet of the hot water pump P02, and a hot water user E03 is connected with a condensed water storage tank V01; the hot water pump P02 is directly communicated with the condensed water storage tank V01 through another pipeline, and directly returns water to the condensed water storage tank V01 when needed; the hot water pump P02 is high-lift, small-flow and high-temperature resistant, provides a heat demand for a hot water user E03, and can adjust the liquid level of the flash tank E01 when the liquid level of a cooling water system is high and high-temperature water must be supplemented;
the condensed water storage tank V01 is in a closed state, the condensed water storage tank V01 is provided with a water supplementing valve 7, the water supplementing valve 7 is interlocked with a second liquid level controller 8 arranged on the condensed water storage tank V01, and the condensed water storage tank V01 plays a role in collecting condensed water and can also be used for adding a high-temperature corrosion inhibitor; a water outlet of the condensed water storage tank V01 is connected with a condensed water pump P03, the condensed water storage tank V01 is high-lift flow and high-temperature resistant, a flow sensor is arranged at a water outlet of the condensed water pump P03, and the condensed water storage tank V01 is connected through an automatic return valve 10;
one end of the pipeline heater is connected with a condensate water pump P03, the other end of the pipeline heater is connected with a water inlet of a booster pump P01 through a first automatic regulating valve 9, the pipeline heater is connected with a water vapor regulating valve 12 through a temperature controller 13, the first automatic regulating valve 9 is connected with an automatic return valve 10 through a first liquid level controller 4, the automatic return valve 10 is connected with a condensate water storage tank V01, and the first automatic regulating valve 9 and the automatic return valve 10 are oppositely opened and closed;
the booster pump P01 is low in lift, large in flow and high in temperature resistance, ensures the circulation volume of cooling water, takes away the reaction heat in the synthesis reactor R01 in time, and is provided with a pressure sensor at the outlet;
a fresh water valve 11 is arranged at the water inlet of the heat exchanger E04, and the water outlet of the heat exchanger E04 is connected with a condensed water storage tank V01 through a pipeline.
A method for producing medium-pressure steam as a byproduct in a vinyl chloride synthesis system comprises the following steps:
the method comprises the following steps: opening the water supplementing valve 7 to supplement 10-15% of liquid level cooling water for the condensate water storage tank V01, and controlling the liquid level of the condensate water storage tank V01 by interlocking the water supplementing valve 7 with the second liquid level controller;
step two: pumping water from a condensate water storage tank V01 to a pipeline heater through a condensate water pump P03 to supplement circulating water for a circulating cooling water system;
step three: starting a steam regulating valve to heat water of the pipeline heater, interlocking the steam regulating valve and a temperature controller 13 to control the water temperature, controlling the water temperature to be 88-90 ℃, if the steam valve is fully opened and the water temperature is not raised to 88-90 ℃, reducing the supplementary water amount through an outlet manual valve of a condensate water pump P03, and unlocking the steam regulating valve and the temperature controller 13 during normal operation;
step four: opening an inlet and outlet valve of a booster pump P01 and an inlet and outlet valve of a synthesis reactor R01, enabling high-temperature water of the pipeline heater to flow to the synthesis reactor R01 through a first automatic regulating valve 9 and a booster pump P01, and then flow to a flash tank E01, wherein the first automatic regulating valve 9, an automatic return valve 10 and a first liquid level controller 4 are interlocked to control the liquid level of the flash tank E01, and the first automatic regulating valve 9 and the automatic return valve 10 are oppositely opened and closed;
step five: when the liquid level of the flash tank E01 reaches a set value of 45-55%, starting a booster pump P01;
step six: starting a hot water pump P02 to convey high-temperature water in a flash tank E01 to a hot water user E03 to preheat a chloroethylene synthesis reaction material, and then returning the reaction material to a condensed water storage tank V01 for circulation;
step seven: opening a material valve of a synthesis reactor R01, performing chloroethylene synthesis reaction to release heat energy, cooling the chloroethylene synthesis reaction by cooling water provided by a booster pump P01 for heat exchange, and returning the water after heat exchange to a flash tank E01 through a pipeline for circulation;
step eight: when the pressure of the flash tank E01 reaches a set value of 2-5 KPa, starting a water vapor compressor C01 to provide high-temperature steam for a steam user E02, returning the steam to a condensate water storage tank V01 through a steam trap after use, and interlocking the water vapor compressor C01 with a pressure controller to control the pressure in the flash tank E01;
step nine: and opening the fresh water valve 11, introducing fresh soft water into the heat exchanger E04 to exchange heat with the vinyl chloride gas, and allowing the water after heat exchange to enter a condensed water storage tank V01 for circulation.
In the invention, the flashed cooling water is circulated and cooled to the synthesis reactor R01 by a booster pump P01 and/or a thermal siphon effect.
Preferably, in the third step, the pressure for supplementing and conveying the high-temperature cooling water is 0.3-0.4 MPa, the temperature is 88-90 ℃, and the flow is 12-15 m3And h, ensuring that the water level can reach the E0145-55% liquid level of the flash tank, and ensuring that the materials are preheated to the required temperature for reaction.
Preferably, in the fifth step, the temperature of cooling water in the primary operation is 88-90 ℃, the cooling water is preheated for a synthesis reactor R01 to play a role of activating a catalyst, and the flow rate of circulating cooling water is more than 40m3And h, ensuring that the reaction heat is removed in time.
Preferably, in the fifth step, the temperature of the cooling water in normal operation is 100-102 ℃, the sublimation failure of the catalyst at the reaction side of the synthesis reactor R01 is prevented, and the flow of the circulating cooling water is more than 40m3And h, ensuring that the reaction heat is removed in time.
Preferably, in the fifth step, the lift of the booster pump P01 should be 11-15 m to ensure the cooling water to circulate.
Preferably, in the eighth step, the vaporization area of the flash tank E01 is 1.2-1.5 times of the calculated area, so as to ensure the economic operation of the water vapor compressor C01.
Preferably, in the step eight, the pressure in the flash tank E01 is kept at 2-5 KPa to achieve the evaporation intensity at a certain flash evaporation area, so as to ensure that the heat in the circulating cooling water is taken away in time; the liquid level in the flash tank E01 is kept between 50% and 60% to prevent the temperature of the R01 of the synthesis reactor from being uncontrolled due to unstable flow of circulating cooling water.
Preferably, in the eighth step, the steam compressor C01 has an automatic energy level adjustment function of 70% to 100% to ensure that the pressure in the flash tank E01 can be changed as required, so as to control the temperature of the cooling water and further achieve the optimal reaction temperature of the vinyl chloride synthesis reactor R01.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. The utility model provides a device of chloroethylene synthesis system byproduct middling pressure steam which characterized in that: the system comprises a synthesis reactor, a flash tank, a steam compressor, a booster pump, a hot water pump, a pipeline heater, a cooling water supplement system, a condensed water storage tank, a condensed water pump and a heat exchanger;
the water outlet of the synthesis reactor is connected with the flash tank, the water inlet of the synthesis reactor is connected with the booster pump, and the reaction gas outlet of the synthesis reactor is connected with the heat exchanger;
the water outlet of the flash tank is respectively connected with the booster pump and the hot water pump, and the steam outlet of the flash tank is connected with the water vapor compressor;
the steam compressor is connected with a steam user, the steam user is connected with a steam trap, and the steam trap is connected with a condensed water storage tank;
the hot water pump is connected with a hot water user through a pipeline, and the hot water user is connected with the condensed water storage tank;
one end of the pipeline heater is connected with a condensate pump, the other end of the pipeline heater is connected with a water inlet of the booster pump through a first automatic regulating valve, and the pipeline heater is connected with a steam regulating valve through a temperature controller;
the condensed water storage tank is provided with a water replenishing valve, and a water outlet of the condensed water storage tank is connected with a condensed water pump;
a fresh water valve is arranged at a water inlet of the heat exchanger, and a water outlet of the heat exchanger is connected with a condensed water storage tank through a pipeline.
2. The apparatus for producing medium-pressure steam as defined in claim 1, wherein: the cooling water side of the synthesis reactor is provided with a baffle plate, the cooling water side is divided into three sections which are not communicated with each other, and each section is provided with a water inlet and a water outlet.
3. The apparatus for producing medium-pressure steam as defined in claim 1, wherein: the system is characterized in that a silk screen mist eliminator positioned above the water inlet is arranged in the flash tank, a manual emptying valve, an automatic emptying valve, a first pressure controller, a first liquid level controller and a temperature sensor are arranged on the flash tank, the automatic emptying valve is interlocked with the first pressure controller, the first pressure controller is interlocked with the water vapor compressor, and the first liquid level controller is interlocked with the automatic regulating valve.
4. The apparatus for producing medium-pressure steam as defined in claim 3, wherein: the first automatic regulating valve is connected with the automatic backflow valve through the first liquid level controller, the automatic backflow valve is connected with the condensed water storage tank, and the first automatic regulating valve and the automatic backflow valve are opposite in switch.
5. The apparatus for producing medium-pressure steam as defined in claim 1, wherein: the driving motor of the water vapor compressor is controlled by a frequency converter, a second pressure controller, a flow sensor and a temperature sensor are arranged at the outlet of the water vapor compressor, and the second pressure controller is interlocked with a second automatic regulating valve.
6. The apparatus for producing medium-pressure steam as defined in claim 1, wherein: and the water supplementing valve is interlocked with a second liquid level controller arranged in the condensed water storage tank.
7. A method for producing medium-pressure steam as a byproduct in a vinyl chloride synthesis system is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: opening a water replenishing valve to replenish cooling water for the condensed water storage tank, and controlling the liquid level of the condensed water storage tank by interlocking the water replenishing valve with a second liquid level controller;
step two: pumping water from the condensate storage tank to the pipeline heater through the condensate pump;
step three: starting a steam regulating valve to heat water in the pipeline heater, controlling the water temperature by interlocking the steam regulating valve with a temperature controller, and removing the interlocking of the steam regulating valve and the temperature controller in normal operation;
step four: opening an inlet and outlet valve of a booster pump and an inlet and outlet valve of a synthesis reactor, wherein high-temperature water of a pipeline heater flows to the synthesis reactor through a first automatic regulating valve and the booster pump and then flows to a flash tank, the first automatic regulating valve, an automatic reflux valve and a first liquid level controller control the liquid level of the flash tank in an interlocking manner, and the first automatic regulating valve and the automatic reflux valve are opposite in switch;
step five: when the liquid level of the flash tank reaches a set value, starting a booster pump;
step six: starting a hot water pump to convey high-temperature water in the flash tank to a hot water user for preheating chloroethylene synthesis reaction materials, and then returning the high-temperature water to a condensed water storage tank for circulation;
step seven: opening a material valve of the synthesis reactor, performing vinyl chloride synthesis reaction to release heat energy, cooling the heat energy by cooling water provided by a booster pump, and returning the heat-exchanged water to the flash tank for circulation through a pipeline;
step eight: when the pressure of the flash tank reaches a set value, starting a water vapor compressor to provide high-temperature steam for a steam user, returning the steam to a condensate water storage tank for circulation through a steam trap after the steam compressor is used, and controlling the pressure in the flash tank by interlocking the water vapor compressor and a pressure controller;
step nine: and opening a fresh water valve, introducing fresh soft water into the heat exchanger to exchange heat with the vinyl chloride gas, and allowing the water after heat exchange to enter a condensed water storage tank for circulation.
8. The method of producing medium pressure steam as a byproduct in a vinyl chloride synthesis system according to claim 7, wherein: in the fifth step, the temperature of cooling water in the first operation is 88-90 ℃, the cooling water is preheated for the synthesis reactor and plays a role of activating a catalyst, and the flow rate of circulating cooling water is more than 40m3And h, ensuring that the reaction heat is removed in time.
9. The method of producing medium pressure steam as a byproduct in a vinyl chloride synthesis system according to claim 7, wherein: in the fifth step, the temperature of the cooling water is 100-102 ℃ during normal operation, the sublimation failure of the catalyst at the reaction side of the synthesis reactor is prevented, and the flow rate of the circulating cooling water is more than 40m3And h, ensuring that the reaction heat is removed in time.
10. The method of producing medium pressure steam as a byproduct in a vinyl chloride synthesis system according to claim 7, wherein: in the eighth step, the pressure in the flash tank is kept at 2-5 KPa to achieve the evaporation intensity at a certain flash evaporation area and ensure that the heat in the circulating cooling water is taken away in time; the liquid level in the flash tank is kept between 50 and 60 percent, and the temperature of the synthesis reactor is prevented from being uncontrolled due to unstable flow of circulating cooling water.
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