CN114733220A - Warm water system for industrial naphthalene distillation production process and working method thereof - Google Patents
Warm water system for industrial naphthalene distillation production process and working method thereof Download PDFInfo
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- CN114733220A CN114733220A CN202210333500.1A CN202210333500A CN114733220A CN 114733220 A CN114733220 A CN 114733220A CN 202210333500 A CN202210333500 A CN 202210333500A CN 114733220 A CN114733220 A CN 114733220A
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- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 title claims abstract description 300
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 281
- 238000004821 distillation Methods 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims description 27
- 239000000498 cooling water Substances 0.000 claims description 20
- 238000002425 crystallisation Methods 0.000 claims description 15
- 230000008025 crystallization Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 9
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 6
- 239000002826 coolant Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000011269 tar Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a warm water system for an industrial naphthalene distillation production process and a working method thereof, wherein the warm water system comprises a warm water tank, a warm water cooler, a naphthalene vapor condenser, a warm water user and a rectifying tower; the invention not only can provide stable cooling medium for industrial naphthalene distillation production, but also can reasonably cool and collect naphthalene steam discharged after the safety valve jumps under accident conditions; the method realizes the perfect combination of process design and safety design, ensures the stable and reliable industrial naphthalene distillation production process, and has the advantages of simple process flow, energy conservation, environmental protection and good operation effect.
Description
Technical Field
The invention relates to the technical field of tar processing, in particular to a warm water system for an industrial naphthalene distillation production process and a working method thereof.
Background
The industrial naphthalene distillation is an important process in the tar processing process, and the produced product, namely industrial naphthalene, is one of main products in the tar processing industry, and the yield of the industrial naphthalene accounts for about 10-12% of coal tar. The naphthalene content in the industrial naphthalene is not less than 95 percent, and the crystallization point is not lower than 78 ℃. The industrial naphthalene distillation has various production processes, and the industrial naphthalene distillation is divided into normal pressure distillation, reduced pressure distillation and pressure distillation according to different operation pressures; the method is divided into a double-furnace double-tower method, a single-furnace double-tower method and a single-furnace single-tower method according to different equipment configurations. No matter which production process is adopted, the processes of heating up, distilling and separating, cooling down and the like of raw materials, intermediate products or products are involved.
Because the crystallization point temperature of naphthalene is high, in order to ensure the continuous and stable distillation process of industrial naphthalene and prevent the blockage of equipment and pipelines caused by naphthalene crystallization, the adopted cooling medium and the corresponding process method must be strictly controlled when the process medium is cooled.
In addition, in the industrial naphthalene distillation process, because the working pressure and the temperature are high (for example, when a single-furnace double-tower and pressurized distillation process is adopted, the top pressure of a rectifying tower is about 0.18-0.26 MPa, and the temperature is about 260-280 ℃), the related equipment is a pressure container, and the related pipeline is a pressure pipeline, so that necessary safety valves are required to be arranged according to the requirements of relevant national standards and specifications to carry out safety protection on the equipment and the pipeline. When the rectifying tower is in an accident state, the overpressure of the rectifying tower can cause the safety valve to jump, and how to cool and collect naphthalene steam sprayed out of the safety valve is also very important.
The original industrial naphthalene distillation system does not carry out any treatment on naphthalene steam sprayed out from the outlet of the safety valve and directly discharges the naphthalene steam into the atmosphere; in the newly-built industrial naphthalene distillation system, because the environmental protection requirement is improved, some of the industrial naphthalene distillation systems are provided with a cooler at the outlet of the safety valve to cool and collect the exhaust gas of the safety valve, but because the cooler cannot be guaranteed to be in a hot state for a long time during normal production, when the safety valve jumps under an accident state, the sprayed naphthalene steam can be crystallized due to too low temperature, so that the safety valve is blocked and even safety accidents are caused. For example, chinese patent application publication No. CN109806716A discloses "an emergency venting system for safety valve in coking production process", in which an air cooler is used to cool the gas discharged from the safety valve, and then the cooled gas is discharged to an underground vent tank, which is not suitable for an industrial naphthalene distillation system, because the cooling temperature of the air cooler is affected by the ambient temperature, and naphthalene vapor may be crystallized after air cooling, resulting in blockage of pipelines and equipment.
Disclosure of Invention
The invention provides a warm water system for an industrial naphthalene distillation production process and a working method thereof, which can not only provide a stable cooling medium for industrial naphthalene distillation production, but also reasonably cool and collect naphthalene steam discharged after a safety valve jumps under an accident condition; the method realizes the perfect combination of process design and safety design, ensures the stable and reliable industrial naphthalene distillation production process, and has the advantages of simple process flow, energy conservation, environmental protection and good operation effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a warm water system for an industrial naphthalene distillation production process comprises a warm water tank, a warm water cooler, a naphthalene steam condenser, a warm water user and a rectifying tower; the top of the warm water tank is provided with a dispersion port, the upper part of the warm water tank is provided with a steam inlet, and the bottom of the warm water tank is provided with a warm water outlet; the warm water outlet is respectively connected with the first circulating pipeline and the second circulating pipeline; the first circulation pipeline is sequentially connected with a warm water circulation pump, a warm water cooler and a warm water user along the warm water flowing direction; the second circulating pipeline is sequentially connected with the naphthalene steam condenser and a steam inlet of the warm water tank along the warm water flowing direction; the first circulation pipeline at the downstream of the warm water circulating pump is connected with the second circulation pipeline at the upstream of the naphthalene steam condenser through a communication pipeline, a flow-limiting orifice plate is arranged on the communication pipeline, and a check valve is arranged on the second circulation pipeline at the upstream of a connector of the communication pipeline; and a safety valve is arranged on a naphthalene steam outlet pipeline at the top of the rectifying tower, and the naphthalene steam condenser is additionally connected with a safety valve outlet of the rectifying tower.
The warm water cooler is provided with a cooling water inlet connected with a cooling water inlet pipe, a cooling water outlet connected with a cooling water outlet pipe, and the cooling water inlet pipe is provided with an adjusting valve; a first thermometer is arranged on a first circulating pipeline at the downstream of the warm water cooler, and the first thermometer is controlled by an adjusting valve in an interlocking mode.
The warm water tank is provided with a second thermometer and a liquid level meter.
And the upper part of the warm water tank is also provided with a steam heating pipe and a boiler water replenishing pipe.
And the second circulation pipeline is connected with the shell pass of the naphthalene steam condenser, and the tube pass inlet of the naphthalene steam condenser is connected with the safety valve outlet of the rectifying tower.
And a steam inlet of the warm water tank is arranged on one side of the gas phase space above the highest liquid level of the warm water tank.
The warm water tank is higher than the naphthalene steam condenser and the warm water circulating pump.
The warm water user comprises an industrial naphthalene cooler.
A working method of a warm water system for an industrial naphthalene distillation production process comprises the following steps:
1) the temperature of a warm water outlet of the warm water cooler is 80-85 ℃, the warm water is heated by a warm water user to become hot water with the temperature of more than 90 ℃, most of the hot water returns to the warm water cooler after being pressurized by a warm water circulating pump, and the hot water is cooled by cooling water and then is recycled; under the action of the flow-limiting orifice plate and the check valve, a small amount of hot water at the outlet of the warm water circulating pump passes through the naphthalene steam condenser and is then sent to the warm water tank, and flows back to the inlet of the warm water circulating pump from the outlet at the bottom of the warm water tank; during normal production, the temperature of the naphthalene steam condenser and the warm water tank is always kept above 80 ℃;
2) in an accident state, a safety valve at the top of the rectifying tower jumps, and naphthalene steam sprayed from the safety valve enters a naphthalene steam condenser, so that on one hand, the naphthalene crystallization phenomenon cannot occur because the temperature of the naphthalene steam condenser is higher than the naphthalene crystallization temperature; on the other hand, the high-temperature naphthalene steam vaporizes the hot water in the naphthalene steam condenser to form water vapor, the water vapor enters the warm water tank and is finally discharged into the atmosphere through the diffusing port, and the liquid naphthalene condensed by the naphthalene steam flows into the naphthalene emptying tank;
3) the warm water tank is higher than the naphthalene steam condenser and the warm water circulating pump, a set liquid level is always kept in the warm water tank, and water in the warm water tank can be used for supplementing water when a warm water system is in water shortage; in addition, the top of the warm water tank is communicated with the atmosphere, so that the volume change of a warm water system caused by temperature fluctuation can be buffered by utilizing the liquid level change in the warm water tank, and the stable operation of a warm water circulating pump is ensured;
4) the warm water tank is provided with a second thermometer and a liquid level meter, when the temperature or the liquid level is lower than a set minimum value, an alarm is given, external steam is introduced in time to heat the warm water tank, and external boiler water is introduced to supplement water to the warm water tank.
Compared with the prior art, the invention has the beneficial effects that:
1) a set of warm water system is arranged to cool a process medium which is easy to crystallize in the industrial naphthalene distillation process, and the temperature of the warm water is automatically controlled to be always kept above the temperature of a naphthalene crystallization point, so that the system is prevented from being blocked by crystallization, the automation level is high, the warm water is used as a cooling medium for repeated recycling, and the system is energy-saving and safe;
2) a naphthalene vapor condenser is arranged at the outlet of a safety valve arranged at the top of a rectifying tower in an industrial naphthalene distillation system, a small amount of hot water is taken out from the warm water system, introduced into the naphthalene vapor condenser and circularly enters a warm water tank, so that the temperature of the naphthalene vapor condenser and the warm water tank is always kept above the temperature of a naphthalene crystallization point; once the safety valve jumps under the accident state, the naphthalene steam discharged by the safety valve can be cooled and collected by using hot water, so that the process design and the safety design complement each other, and the energy consumption of the system is low;
3) the warm water tank is higher than the warm water circulating pump and the naphthalene steam condenser, so that safe operation of the warm water circulating pump is guaranteed, warm water in the naphthalene steam condenser is heated and vaporized into water vapor once the safety valve jumps, the warm water tank can provide enough warm water for the naphthalene steam condenser, the warm water tank is used for cooling high-temperature naphthalene vapor sprayed by the safety valve, the production process is stable and reliable, and the environment-friendly effect is good.
Drawings
FIG. 1 is a schematic diagram of a warm water system for an industrial naphthalene distillation production process according to the present invention.
In the figure: 1. warm water circulating pump 2, warm water cooler 3, warm water user 4, warm water tank 5, rectifying tower 6, safety valve 7, naphthalene vapor condenser 8, check valve 9, flow-limiting orifice plate 10, thermometer I11, regulating valve 12, thermometer II 13 and liquid level meter
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1, the warm water system for the industrial naphthalene distillation production process comprises a warm water tank 4, a warm water cooler 2, a naphthalene vapor condenser 7, a warm water user 3 and a rectifying tower 5; the top of the warm water tank 4 is provided with a dispersion port, the upper part is provided with a steam inlet, and the bottom is provided with a warm water outlet; the warm water outlet is respectively connected with the first circulating pipeline and the second circulating pipeline; the first circulation pipeline is sequentially connected with a warm water circulation pump 1, a warm water cooler 2 and a warm water user 3 along the warm water flowing direction; the second circulating pipeline is sequentially connected with the naphthalene steam condenser 7 and a steam inlet of the warm water tank 4 along the warm water flowing direction; a first circulation pipeline at the downstream of the warm water circulating pump 1 is connected with a second circulation pipeline at the upstream of the naphthalene steam condenser 7 through a communication pipeline, a flow-limiting orifice plate 9 is arranged on the communication pipeline, and a check valve 8 is arranged on the second circulation pipeline at the upstream of a connector of the communication pipeline; and a safety valve 6 is arranged on a naphthalene steam outlet pipeline at the top of the rectifying tower 5, and the naphthalene steam condenser 7 is additionally connected with a safety valve outlet of the rectifying tower 5.
The warm water cooler 2 is provided with a cooling water inlet connected with a cooling water inlet pipe, a cooling water outlet connected with a cooling water outlet pipe, and the cooling water inlet pipe is provided with an adjusting valve 11; a first thermometer 10 is arranged on a first circulation pipeline at the downstream of the warm water cooler 2, and the first thermometer 10 and a regulating valve 11 are controlled in an interlocking way.
The warm water tank 4 is provided with a second thermometer 12 and a liquid level meter 13.
And the upper part of the warm water tank 4 is also provided with a steam heating pipe and a boiler water replenishing pipe.
And the second circulation pipeline is connected with the shell pass of the naphthalene steam condenser 7, and the tube pass inlet of the naphthalene steam condenser 7 is connected with the safety valve outlet of the rectifying tower 5.
And a steam inlet of the warm water tank 4 is arranged at one side of the gas phase space above the highest liquid level of the warm water tank 4.
The warm water tank 4 is arranged higher than the naphthalene steam condenser 7 and the warm water circulating pump 1.
The warm water user 3 comprises an industrial naphthalene cooler.
A working method of a warm water system for an industrial naphthalene distillation production process comprises the following steps:
1) the temperature of a warm water outlet of the warm water cooler 2 is 80-85 ℃, the warm water is heated by a warm water user 3 to become hot water with the temperature of more than 90 ℃, most of the hot water returns to the warm water cooler 2 after being pressurized by the warm water circulating pump 1, and the hot water is cooled by cooling water and then is recycled; under the action of a flow-limiting orifice plate 9 and a check valve 8, a small amount of hot water at the outlet of the warm water circulating pump 1 passes through a naphthalene steam condenser 7 and then is sent to a warm water tank 4, and flows back to the inlet of the warm water circulating pump 1 from the outlet at the bottom of the warm water tank 4; during normal production, the temperature of the naphthalene steam condenser 7 and the warm water tank 4 is always kept above 80 ℃;
2) in an accident state, the safety valve 6 at the top of the rectifying tower 5 jumps, and naphthalene steam sprayed from the safety valve 6 enters the naphthalene steam condenser 7, so that on one hand, the naphthalene crystallization phenomenon cannot occur because the temperature of the naphthalene steam condenser 7 is higher than the naphthalene crystallization temperature; on the other hand, the high-temperature naphthalene steam vaporizes the hot water in the naphthalene steam condenser 7 to form water steam, the water steam enters the warm water tank 4 and is finally discharged into the atmosphere through the release port, and the liquid naphthalene condensed by the naphthalene steam flows into the naphthalene emptying tank;
3) the position of the warm water tank 4 is higher than the naphthalene steam condenser 7 and the warm water circulating pump 1, a set liquid level is always kept in the warm water tank 4, and water in the warm water tank 4 can be used for supplementing water when the warm water system is in water shortage; in addition, because the top of the warm water tank 4 is communicated with the atmosphere, the volume change of the warm water system caused by temperature fluctuation can be buffered by utilizing the liquid level change in the warm water tank 4, so that the stable operation of the warm water circulating pump 1 is ensured;
4) the warm water tank 4 is provided with a second thermometer 12 and a liquid level meter 13, when the temperature or the liquid level is lower than a set minimum value, alarm is given, external steam is timely introduced to heat the warm water tank 4, and external boiler water is introduced to supplement water for the warm water tank 4.
The invention relates to a warm water system for an industrial naphthalene distillation production process, which comprises a warm water circulating pump 1, a warm water cooler 2, a warm water user 3 (such as an industrial naphthalene cooler and the like), a warm water tank 4, a rectifying tower 5, a safety valve 6 and a naphthalene steam condenser 7; the outlet of the warm water circulating pump 1 is connected with the warm water inlet of the warm water cooler 2, the warm water outlet of the warm water cooler 2 is connected with the warm water inlet of the warm water user 3, and the warm water outlet of the warm water user 3 is connected with the inlet of the warm water circulating pump 1.
A warm water pipeline connected with an outlet at the bottom of the warm water tank 4 is divided into two paths, wherein one path is connected with an inlet of the warm water circulating pump 1, and the other path is provided with a check valve 8 and is connected with a shell pass inlet of a naphthalene steam condenser 7; the shell pass outlet of the naphthalene steam condenser 7 is connected with the steam inlet on the warm water tank 4.
A branch pipe is led out from the outlet of the warm water circulating pump 1, a flow-limiting orifice plate 9 is arranged on the branch pipe, and a warm water pipeline connected with a shell pass inlet of the naphthalene steam condenser 7 is connected to the downstream of the check valve 8.
A safety valve 6 is arranged on a naphthalene steam outlet pipeline at the top of the rectifying tower 5, and the outlet of the safety valve 6 is connected with a tube pass inlet of a naphthalene steam condenser 7.
A first thermometer 10 is arranged on a warm water outlet pipeline of the warm water cooler 2, a regulating valve 11 is arranged on a cooling water inlet pipeline of the warm water cooler 2, and the first thermometer 10 and the regulating valve 11 are interlocked to control automatic regulation of cooling water flow so that the temperature of a warm water outlet of the warm water cooler 2 is controlled to be about 80 ℃.
The warm water tank 4 is higher than the naphthalene steam condenser 7 and the warm water circulating pump 1; the top of the warm water tank 4 is provided with a dispersion port communicated with the atmosphere, and the shell pass outlet of the naphthalene vapor condenser 7 is connected to the gas phase space above the highest liquid level in the warm water tank 4. The warm water tank 4 is provided with a second thermometer 12, a liquid level meter 13, a steam heating pipe and a boiler water replenishing pipe.
During normal production, after warm water is heated by the warm water user 3, most of the warm water is cooled by the warm water cooler 2 and then recycled, a small amount of hot water is sent back to the warm water tank 4 through the naphthalene steam condenser 7 to be circulated, and the temperature of a warm water outlet of the warm water cooler 2 is controlled to be more than 80 ℃, so that the temperature of the naphthalene steam condenser 7 and the temperature of the warm water tank 4 can be always kept to be more than 80 ℃ and higher than the crystallization point temperature of naphthalene.
Under the accident situation, 5 top relief valves 6 take-off backs of rectifying column of spun naphthalene steam gets into naphthalene steam condenser 7, on the one hand because the temperature of naphthalene steam condenser 7 is higher than the temperature of naphthalene crystallization, be unlikely to appear leading to the condition of equipment and pipeline jam because of the naphthalene crystallization, on the other hand spun high temperature naphthalene steam becomes the steam with the hot water vaporization in the naphthalene steam condenser 7 and sends into warm water groove 4 and discharge to the atmosphere, naphthalene steam is then cooled by the condensation and flows into naphthalene emptying tank for liquid naphthalene, the cooling and the collection of naphthalene steam have been realized.
The warm water system is provided with 2 circulation loops, the position of the warm water tank 4 is higher than the naphthalene steam condenser 7 and the warm water circulating pump 1, and a certain liquid level is always kept in the warm water tank 4, so that on one hand, water in the warm water tank 4 can be used for replenishing water to the system when the warm water system is in water shortage, and on the other hand, because the top of the warm water tank 4 is communicated with the atmosphere, the volume change of the warm water system caused by temperature fluctuation can be buffered by using the liquid level change in the warm water tank 4, and the stable operation of the warm water circulating pump 1 is ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A warm water system for an industrial naphthalene distillation production process is characterized by comprising a warm water tank, a warm water cooler, a naphthalene steam condenser, a warm water user and a rectifying tower; the top of the warm water tank is provided with a dispersion port, the upper part of the warm water tank is provided with a steam inlet, and the bottom of the warm water tank is provided with a warm water outlet; the warm water outlet is respectively connected with the first circulating pipeline and the second circulating pipeline; the first circulation pipeline is sequentially connected with a warm water circulation pump, a warm water cooler and a warm water user along the warm water flowing direction; the second circulating pipeline is sequentially connected with the naphthalene steam condenser and a steam inlet of the warm water tank along the warm water flowing direction; the first circulation pipeline at the downstream of the warm water circulating pump is connected with the second circulation pipeline at the upstream of the naphthalene steam condenser through a communication pipeline, a flow-limiting orifice plate is arranged on the communication pipeline, and a check valve is arranged on the second circulation pipeline at the upstream of a connector of the communication pipeline; and a safety valve is arranged on a naphthalene steam outlet pipeline at the top of the rectifying tower, and the naphthalene steam condenser is additionally connected with a safety valve outlet of the rectifying tower.
2. The warm water system for the industrial naphthalene distillation production process according to claim 1, wherein the warm water cooler is provided with a cooling water inlet connected with a cooling water inlet pipe, a cooling water outlet connected with a cooling water outlet pipe, and the cooling water inlet pipe is provided with an adjusting valve; a first thermometer is arranged on a first circulating pipeline at the downstream of the warm water cooler, and the first thermometer is controlled by an adjusting valve in an interlocking mode.
3. The warm water system for the industrial naphthalene distillation production process according to claim 1, wherein the warm water tank is provided with a second thermometer and a liquid level meter.
4. The warm water system for the industrial naphthalene distillation production process according to claim 1, wherein a steam heating pipe and a boiler water replenishing pipe are further arranged at the upper part of the warm water tank.
5. The warm water system for the industrial naphthalene distillation production process according to claim 1, wherein the second circulation pipeline is connected with a shell side of a naphthalene steam condenser, and a tube side inlet of the naphthalene steam condenser is connected with a safety valve outlet of a rectifying tower.
6. The warm water system for the industrial naphthalene distillation production process according to claim 1, wherein a steam inlet of the warm water tank is arranged on one side of the gas phase space above the highest liquid level of the warm water tank.
7. The warm water system for the industrial naphthalene distillation production process according to claim 1, wherein the warm water tank is arranged higher than the naphthalene steam condenser and the warm water circulating pump.
8. The warm water system for the industrial naphthalene distillation production process according to claim 1, wherein the warm water user comprises an industrial naphthalene cooler.
9. The working method of the warm water system for the industrial naphthalene distillation production process according to any one of claims 1 to 8, characterized by comprising the following steps:
1) the temperature of a warm water outlet of the warm water cooler is 80-85 ℃, the warm water is heated by a warm water user to become hot water with the temperature of more than 90 ℃, most of the hot water returns to the warm water cooler after being pressurized by a warm water circulating pump, and the hot water is cooled by cooling water and then is recycled; under the action of the flow-limiting orifice plate and the check valve, a small amount of hot water at the outlet of the warm water circulating pump passes through the naphthalene steam condenser and is then sent to the warm water tank, and flows back to the inlet of the warm water circulating pump from the outlet at the bottom of the warm water tank; during normal production, the temperature of the naphthalene steam condenser and the warm water tank is always kept above 80 ℃;
2) in an accident state, a safety valve at the top of the rectifying tower jumps, and naphthalene steam sprayed from the safety valve enters a naphthalene steam condenser, so that on one hand, the naphthalene crystallization phenomenon cannot occur because the temperature of the naphthalene steam condenser is higher than the naphthalene crystallization temperature; on the other hand, the high-temperature naphthalene steam vaporizes the hot water in the naphthalene steam condenser to form water vapor, the water vapor enters the warm water tank and is finally discharged into the atmosphere through the diffusing port, and the liquid naphthalene condensed by the naphthalene steam flows into the naphthalene emptying tank;
3) the warm water tank is higher than the naphthalene steam condenser and the warm water circulating pump, a set liquid level is always kept in the warm water tank, and water in the warm water tank can be used for supplementing water when a warm water system is in water shortage; in addition, the top of the warm water tank is communicated with the atmosphere, so that the volume change of a warm water system caused by temperature fluctuation can be buffered by utilizing the liquid level change in the warm water tank, and the stable operation of a warm water circulating pump is ensured;
4) the warm water tank is provided with a second thermometer and a liquid level meter, when the temperature or the liquid level is lower than a set minimum value, the warm water tank is alarmed, external steam is timely introduced to heat the warm water tank, and external boiler water is introduced to supplement water to the warm water tank.
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| CN202210333500.1A CN114733220A (en) | 2022-03-31 | 2022-03-31 | Warm water system for industrial naphthalene distillation production process and working method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375239A (en) * | 2018-04-28 | 2018-08-07 | 中冶焦耐(大连)工程技术有限公司 | The method and system of Water heating system waste heating are distilled using high temperature coal-tar |
| CN113403103A (en) * | 2021-06-24 | 2021-09-17 | 中冶焦耐(大连)工程技术有限公司 | Process for extracting at top of industrial naphthalene rectifying tower and emptying safety valve |
| CN114106861A (en) * | 2021-12-29 | 2022-03-01 | 中冶焦耐(大连)工程技术有限公司 | System and method for recovering mixed phenol in phenol residual oil |
| CN217220234U (en) * | 2022-03-31 | 2022-08-19 | 中冶焦耐(大连)工程技术有限公司 | Warm water system for industrial naphthalene distillation production process |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375239A (en) * | 2018-04-28 | 2018-08-07 | 中冶焦耐(大连)工程技术有限公司 | The method and system of Water heating system waste heating are distilled using high temperature coal-tar |
| CN113403103A (en) * | 2021-06-24 | 2021-09-17 | 中冶焦耐(大连)工程技术有限公司 | Process for extracting at top of industrial naphthalene rectifying tower and emptying safety valve |
| CN114106861A (en) * | 2021-12-29 | 2022-03-01 | 中冶焦耐(大连)工程技术有限公司 | System and method for recovering mixed phenol in phenol residual oil |
| CN217220234U (en) * | 2022-03-31 | 2022-08-19 | 中冶焦耐(大连)工程技术有限公司 | Warm water system for industrial naphthalene distillation production process |
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