CN217220234U - Warm water system for industrial naphthalene distillation production process - Google Patents
Warm water system for industrial naphthalene distillation production process Download PDFInfo
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- CN217220234U CN217220234U CN202220734577.5U CN202220734577U CN217220234U CN 217220234 U CN217220234 U CN 217220234U CN 202220734577 U CN202220734577 U CN 202220734577U CN 217220234 U CN217220234 U CN 217220234U
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Abstract
The utility model relates to a warm water system for industrial naphthalene distillation production process, which comprises a warm water tank, a warm water cooler, a naphthalene steam condenser, a warm water user and a rectifying tower; the utility model 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 utility model relates to a tar processing technology field especially relates to a warm water system for industry naphthalene distillation production technology.
Background
The distillation of industrial naphthalene 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 the 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 tower 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 national relevant 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 utility model provides a warm water system for industrial naphthalene distillation production process, which 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.
In order to achieve the above purpose, the utility model 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 circulating pipeline is sequentially connected with a warm water circulating pump, a warm water cooler and a warm water user along the flow direction of warm water; 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.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the method has the advantages that a warm water system is arranged to cool process media which are easy to crystallize in the industrial naphthalene distillation process, the temperature of the warm water is automatically controlled to be always kept above the crystallization point temperature of naphthalene, the system is prevented from being blocked by crystallization, the automation level is high, the warm water is used as the cooling media for repeated recycling, and the method 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 structural 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 description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the warm water system for the industrial naphthalene distillation production process of the present invention comprises a warm water tank 4, a warm water cooler 2, a naphthalene vapor condenser 7, a warm water user 3 and a rectification 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.
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 a tube pass inlet of the naphthalene steam condenser 7 is connected with a 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 process that is used for warm water system of industry naphthalene distillation production technology as follows:
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 a warm water system is lack of water; 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, an alarm is given, external steam is introduced in time to heat the warm water tank 4, and external boiler water is introduced to supplement water for the warm water tank 4.
The utility model relates to a warm water system for industrial naphthalene distillation production technology, which comprises a warm water circulating pump 1, a warm water cooler 2, a warm water user 3 (such as an industrial naphthalene cooler), 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 condition, the spun naphthalene steam gets into naphthalene steam condenser 7 after rectifying column 5 top relief valve 6 take off the jump, on the one hand because the temperature of naphthalene steam condenser 7 is higher than the temperature of naphthalene crystallization, be unlikely to appear because of the condition that the naphthalene crystallization leads to equipment and pipeline to block up, 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 tank 4 and discharge to the atmosphere, naphthalene steam then is cooled by the condensation for liquid naphthalene flows into naphthalene unloading groove, the cooling and the collection of naphthalene steam have been realized.
Warm water system has set up 2 circulation circuit, and the position of warm water groove 4 is higher than naphthalene steam condenser 7 and warm water circulating pump 1, keep certain liquid level again throughout in the warm water groove 4, on the one hand when the warm water system lack of water in the usable warm water groove 4 water supply to the system, on the other hand because warm water groove 4 top communicates with each other with the atmosphere, the liquid level change in the usable warm water groove 4, cushion the volume change of warm water system because the temperature fluctuation leads to, thereby guarantee the steady operation of warm water circulating pump 1.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (8)
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 vapor 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 a 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220734577.5U CN217220234U (en) | 2022-03-31 | 2022-03-31 | Warm water system for industrial naphthalene distillation production process |
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| CN202220734577.5U CN217220234U (en) | 2022-03-31 | 2022-03-31 | Warm water system for industrial naphthalene distillation production process |
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| CN217220234U true CN217220234U (en) | 2022-08-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733220A (en) * | 2022-03-31 | 2022-07-12 | 中冶焦耐(大连)工程技术有限公司 | Warm water system for industrial naphthalene distillation production process and working method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114733220A (en) * | 2022-03-31 | 2022-07-12 | 中冶焦耐(大连)工程技术有限公司 | Warm water system for industrial naphthalene distillation production process and working method thereof |
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