CN216946283U - Steam recovery system of thermal deaerator of phthalic anhydride device - Google Patents
Steam recovery system of thermal deaerator of phthalic anhydride device Download PDFInfo
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- CN216946283U CN216946283U CN202220317352.XU CN202220317352U CN216946283U CN 216946283 U CN216946283 U CN 216946283U CN 202220317352 U CN202220317352 U CN 202220317352U CN 216946283 U CN216946283 U CN 216946283U
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Abstract
The utility model belongs to the technical field of recycling steam in phthalic anhydride production, and relates to a steam recycling system of a thermal deaerator of a phthalic anhydride device, which comprises a desalted water tank, wherein a water utilization facility is externally connected to the bottom of the desalted water tank, a steam distribution pipe is arranged on the lower part of the inner cavity of the desalted water tank, the steam distribution pipe is externally connected with a steam inlet pipe, a deaerator is arranged on the top of the desalted water tank, one side of the upper part of the deaerator is communicated with a heating pipeline outlet of a heat exchanger through a deaerator water inlet pipeline, a heating pipeline inlet of the heat exchanger is externally connected with a water storage device of a water treatment workshop, the other side of the upper part of the deaerator is communicated with a cooling pipeline inlet of the heat exchanger through a deaerator steam outlet pipeline, the cooling pipeline outlet of the heat exchanger is communicated with one end of a condensate pipeline of the heat exchanger, and the other end of the condensate pipeline of the heat exchanger is communicated with a condensate treatment unit. The utility model can deoxidize the desalted water in the deaerator and recycle the steam at the same time, thereby avoiding the waste of heat and desalted water and saving the cost.
Description
Technical Field
The utility model relates to a steam recovery system of a thermal deaerator of a phthalic anhydride device, and belongs to the technical field of steam recovery and utilization in phthalic anhydride production.
Background
In the production process of phthalic anhydride, deoxygenated desalted water needs to be used by a water facility, in the prior art, the desalted water is generally deoxygenated by steam thermal power, namely steam enters a steam distribution pipe at the lower part of the inner cavity of a desalted water tank, the steam exchanges heat with the desalted water from top to bottom in a deaerator, the steam heats the desalted water to the saturation temperature under the working pressure of the deaerator, oxygen and other gases dissolved in the desalted water are removed, the desalted water can be used by the water facility after being deoxygenated, otherwise, the water facility and a matched pipeline can be corroded, but in the process of heating the desalted water by the steam, in order to enable the desalted water to reach the saturation temperature under the working pressure of the deaerator, the deaerator and the desalted water tank do not belong to a pressure container, the pressure bearing does not exceed 0.1MPa, partial steam needs to be discharged, the temperature of the steam discharged from the deaerator is generally about 110 ℃, the amount of steam is about 0.3t/h, resulting in waste of heat and desalted water.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: overcome prior art's not enough, provide a phthalic anhydride device heating power oxygen-eliminating device steam recovery system, to steam recycle when to the desalinized water deoxidization in the oxygen-eliminating device, avoid heat and desalinized water extravagant, practice thrift the cost.
The steam recovery system comprises a desalted water tank, wherein a water utilization facility is externally connected to the bottom of the desalted water tank, a steam distribution pipe is arranged on the lower portion of the inner cavity of the desalted water tank and externally connected with a steam inlet pipe, a deaerator is arranged on the top of the desalted water tank, one side of the upper portion of the deaerator is communicated with a heating pipeline outlet of a heat exchanger through a deaerator water inlet pipeline, a heating pipeline inlet of the heat exchanger is externally connected with a water storage device of a water treatment workshop, the other side of the upper portion of the deaerator is communicated with a cooling pipeline inlet of the heat exchanger through a deaerator steam outlet pipeline, a cooling pipeline outlet of the heat exchanger is communicated with one end of a condensate pipeline of the heat exchanger, and the other end of the condensate pipeline of the heat exchanger is communicated with a condensate treatment unit.
The bottom of the desalted water tank is externally connected with a water using facility through a water outlet pipe. When in use, normal temperature desalted water from a water storage device of a water treatment plant enters a heating pipeline of a heat exchanger to be heated and then enters a deaerator through a deaerator water inlet pipeline, meanwhile, low-pressure steam from the steam pipe network enters a steam distribution pipe through a steam inlet pipe, the steam distribution pipe uniformly distributes and sprays the steam, the steam exchanges heat with desalted water from top to bottom in a deaerator from bottom to top, the desalted water reaches the saturation temperature under the working pressure of the deaerator, the low-pressure steam and oxygen dissolved in the desalted water enter a cooling pipeline of a heat exchanger from a deaerator steam outlet pipeline, the desalted water after thermal deoxygenation enters a desalted water tank and is supplied to an external water-using facility through a water outlet pipe, and the steam entering the cooling pipeline of the heat exchanger exchanges heat with desalted water in the heating pipeline of the heat exchanger, the heat of the steam is absorbed to form condensate, and the condensate is discharged to the condensate treatment unit through the condensate pipeline of the heat exchanger. The steam discharged by the utility model primarily heats the desalted water in the heat exchanger, and then the heated desalted water enters the deaerator to be heated for the second time, so that the heating speed of the desalted water is increased, the working efficiency of the utility model is improved, the heat energy of the steam can be completely absorbed, the waste of heat and desalted water is avoided, the cost is saved, and the economic benefit is improved; the utility model is provided with sufficient potential difference from top to bottom, and the problem of increasing system pressure does not exist in the process of recovering steam condensate.
Preferably, the condensate treatment unit comprises a steam condensate separator, one side of the steam condensate separator is communicated with a condensate pipeline of the heat exchanger, the top of the steam condensate separator is communicated with a steam discharge pipeline of the deaerator through a separator steam discharge pipeline, the bottom of the steam condensate separator is communicated with a water inlet of the condensate collection tank through a separator condensate discharge pipeline, and a water outlet of the condensate collection tank is externally connected with a water suction pump. During the use, steam and the steam of flash distillation of the steam of not complete condensate that gets into the steam condensate separator along with the lime set flow back to the outer discharge pipe way of oxygen-eliminating device steam through separator steam discharge pipeline, then get into the heat exchanger again through the outer discharge pipe way of oxygen-eliminating device steam and carry out the heat exchange with the demineralized water of normal atmospheric temperature, make steam further by the reuse, it causes the heat waste to avoid steam to leak, and the lime set that gets into steam condensate separator gets into the lime set collection tank through separator lime set discharge pipeline, under the effect of pump, carry the demineralized water that the lime set collection tank was retrieved to the water facility, it is extravagant to avoid the demineralized water.
Preferably, the steam condensate separator is provided with a first liquid level meter, and a condensate discharge pipeline of the separator is provided with a condensate regulating valve. The first liquid level meter measures and displays the liquid level of the steam condensate separator, the liquid level height of the steam condensate separator is controlled by controlling the opening and closing of the condensate regulating valve, and after desalted water in the steam condensate separator reaches a certain liquid level, the condensate regulating valve is opened, so that condensate of the steam condensate separator enters a condensate collecting tank through a separator condensate discharge pipeline.
Preferably, the desalted water tank is provided with a safety valve and a pressure gauge. The pressure gauge measures and displays the pressure of the desalted water tank, and when the steam pressure exceeds 0.1MPa, the safety valve is opened, so that the system damage caused by overhigh pressure is avoided, and the equipment safety is ensured.
Preferably, the desalting water tank is further provided with a second liquid level meter, and a water inlet pipeline of the deaerator is provided with a water injection regulating valve. And the liquid level meter II measures and displays the liquid level of the desalted water tank, and controls the liquid level of the desalted water tank by controlling the opening and closing of the water injection regulating valve.
Preferably, an air release valve is further arranged on the deaerator steam outlet pipeline. When the steam pressure of the steam-steam.
Preferably, the inlet of the heating pipeline of the heat exchanger is externally connected with a water storage device of a water treatment workshop through a desalted water inlet pipe. During the use, the desalinized water of water storage device in water treatment workshop enters into the intensification pipeline of heat transfer and heaies up the back through the desalinized water inlet pipe, gets into the oxygen-eliminating device by the oxygen-eliminating device water inlet pipe, uses after carrying out the deoxidization.
Preferably, one side of the heat exchanger is provided with a heat exchanger bypass pipe, two ends of the heat exchanger bypass pipe are respectively communicated with the desalted water inlet pipe and the deaerator water inlet pipeline, and the heat exchanger bypass pipe is further provided with a switch valve. When the device is overhauled and shut down, the switch valve is opened, so that desalted water of the water storage device of the water treatment workshop directly enters the bypass pipe of the heat exchanger through the desalted water inlet pipe, enters the deaerator from the bypass pipe of the heat exchanger through the deaerator water inlet pipeline, is deaerated and then is used, the influence on the operation of the main phthalic anhydride device is avoided when the device is overhauled and shut down, and the working efficiency is improved.
Compared with the prior art, the utility model has the following beneficial effects:
the steam heat energy recovery device is reasonable in structural design, the steam discharged by the deaerator primarily heats the desalted water in the heat exchanger, and then the heated desalted water enters the deaerator to be heated secondarily, so that the temperature rising speed of the desalted water is increased, the working efficiency of the steam heat energy recovery device is improved, the steam heat energy can be completely absorbed, the waste of heat and desalted water is avoided, the cost is saved, and the economic benefit is improved; the utility model has enough potential difference from top to bottom, and the problem of increasing the system pressure does not exist in the process of recovering the steam condensate. The steam condensate separator of the utility model has the function of a water delivery valve, simultaneously does not increase the system pressure, improves the safety and reliability of the utility model, enables uncondensed steam to enter the heat exchanger again for reuse, avoids steam leakage, enables the steam to be fully utilized, avoids waste of steam heat, and enables steam condensate in the steam condensate separator to enter the condensate collecting tank, and the steam condensate recovered by the condensate collecting tank can be used as new desalted water and used by other water facilities under the action of a water suction pump, thereby achieving the purpose of recovering the discharged steam.
Drawings
FIG. 1 is a schematic diagram of a steam recovery system of a thermal deaerator of a phthalic anhydride plant.
In the figure: 1. introducing desalted water into the pipe; 2. a heat exchanger; 3. a heat exchanger bypass pipe; 4. a pressure gauge; 5. a steam distribution pipe; 6. a second liquid level meter; 7. a desalted water tank; 8. a safety valve; 9. an atmospheric valve; 10. a deaerator; 11. introducing steam into the pipe; 12. a water injection regulating valve; 13. a deaerator water inlet pipeline; 14. a deaerator steam discharge pipeline; 15. a separator vapor vent line; 16. a heat exchanger condensate line; 17. a vapor condensate separator; 18. a first liquid level meter; 19. a separator condensate discharge line; 20. a condensate regulating valve; 21. a condensate collection tank; 22. a water pump.
Detailed Description
The utility model is further described below with reference to the accompanying drawings:
as shown in figure 1, the steam recovery system of the phthalic anhydride device thermal deaerator comprises a desalted water tank 7, a water using facility is externally connected to the bottom of the desalted water tank 7, a steam distribution pipe 5 is arranged on the lower portion of an inner cavity of the desalted water tank 7, the steam distribution pipe 5 is externally connected with a steam inlet pipe 11, a deaerator 10 is arranged on the top of the desalted water tank 7, one side of the upper portion of the deaerator 10 is communicated with a heating pipeline outlet of a heat exchanger 2 through a deaerator water inlet pipeline 13, a heating pipeline inlet of the heat exchanger 2 is externally connected with a water storage device of a water treatment workshop, the other side of the upper portion of the deaerator 10 is communicated with a cooling pipeline inlet of the heat exchanger 2 through a deaerator steam outlet pipeline 14, a cooling pipeline outlet of the heat exchanger 2 is communicated with one end of a heat exchanger condensate pipeline 16, and the other end of the heat exchanger condensate pipeline 16 is communicated with a condensate treatment unit.
In this embodiment:
the condensate treatment unit comprises a condensate separator 17, one side of the condensate separator 17 is communicated with a condensate pipeline 16 of the heat exchanger, the top of the condensate separator 17 is communicated with a deaerator steam discharge pipeline 14 through a separator steam discharge pipeline 15, the bottom of the condensate separator 17 is communicated with a water inlet of a condensate collection tank 21 through a separator condensate discharge pipeline 19, and a water outlet of the condensate collection tank 21 is externally connected with a water suction pump 22. During the use, steam that the steam that enters into the steam condensate separator 17 along with the lime set is not the complete condensate and the steam of flash distillation flows back to oxygen-eliminating device steam discharge pipeline 14 through separator steam discharge pipeline 15, then get into heat exchanger 2 again through oxygen-eliminating device steam discharge pipeline 14 and carry out the heat exchange with the desalinized water of normal atmospheric temperature, make steam further by the reuse, avoid steam to leak and cause the heat waste, and the lime set that gets into steam condensate separator 17 gets into lime set collection tank 21 through separator lime set discharge pipeline 19, under the effect of suction pump 22, carry the desalinized water that lime set collection tank 21 was retrieved to the water facility, it is extravagant to avoid the demineralized water.
The steam condensate separator 17 is provided with a first liquid level meter 18, and a condensate discharge pipeline 19 of the separator is provided with a condensate regulating valve 20. The first liquid level meter 18 measures and displays the liquid level of the steam condensate separator 17, the liquid level height of the steam condensate separator 17 is controlled by controlling the opening and closing of the condensate adjusting valve 20, and after desalted water in the steam condensate separator 17 reaches a certain liquid level, the condensate adjusting valve 20 is opened, so that condensate of the steam condensate separator 17 enters a condensate collecting tank 21 through a separator condensate discharging pipeline 19.
The desalting water tank 7 is provided with a safety valve 8 and a pressure gauge 4. The pressure gauge 4 measures and displays the pressure of the desalted water tank 7, and when the steam pressure of the desalting water tank exceeds 0.1MPa, the safety valve 8 is opened, so that the system damage caused by overhigh pressure is avoided, and the equipment safety is ensured.
The desalted water tank 7 is also provided with a second liquid level meter 6, and a water injection regulating valve 12 is arranged on a deaerator water inlet pipeline 13. The second liquid level meter 6 measures and displays the liquid level of the desalted water tank 7, and the liquid level of the desalted water tank 7 is controlled by controlling the opening and closing of the water injection regulating valve 12.
An emptying valve 9 is also arranged on the deaerator steam discharging pipeline 14. When the steam pressure of the steam-steam.
The inlet of the heating pipeline of the heat exchanger 2 is externally connected with a water storage device of a water treatment workshop through a desalted water inlet pipe 1. During the use, the desalinized water of water storage device of water treatment workshop enters the intensification pipeline of heat exchanger 2 through desalinized water inlet pipe 1 and heaies up the back, gets into oxygen-eliminating device 10 by oxygen-eliminating device water inlet pipe 13, uses after carrying out the deoxidization.
A heat exchanger side pipe 3 is arranged on one side of the heat exchanger 2, two ends of the heat exchanger side pipe 3 are respectively communicated with the desalted water inlet pipe 1 and the deaerator water inlet pipeline 13, and a switch valve is further arranged on the heat exchanger side pipe 3. When the device is overhauled and shut down, the switch valve is opened, so that desalted water of the water storage device of the water treatment workshop directly enters the heat exchanger bypass pipe 3 through the desalted water inlet pipe 1, enters the deaerator 10 from the heat exchanger bypass pipe 3 through the deaerator water inlet pipeline 13, and is used after being deaerated, thereby avoiding influencing the operation of a phthalic anhydride main device when the device is overhauled and shut down and improving the working efficiency.
The specific working process, normal temperature desalted water from a water storage device of a water treatment workshop enters a heating pipeline of a heat exchanger 2 through a desalted water inlet pipe 1 to be heated and then enters a deaerator 10 through a deaerator water inlet pipeline 13, low-pressure steam from a steam pipe network enters a steam distribution pipe 5 through a steam inlet pipe 11, the steam distribution pipe 5 uniformly distributes and sprays the steam, the steam exchanges heat with the desalted water from top to bottom in the deaerator 10 from bottom to top, the desalted water reaches the saturation temperature under the working pressure of the deaerator 10, the low-pressure steam and oxygen dissolved in the desalted water enter a cooling pipeline of the heat exchanger 2 from a deaerator steam outlet pipeline 14, the desalted water after thermal deoxidization enters a desalted water tank 7 and is used by an external water facility through a water outlet pipe, and the steam entering the cooling pipeline of the heat exchanger 2 exchanges heat with the desalted water in the heating pipeline of the heat exchanger 2, the heat of the steam is absorbed to form condensate, the condensate is discharged to a steam condensate separator 17 through a heat exchanger condensate pipeline 16, steam which enters the steam condensate separator 17 along with the condensate and is not condensed completely and steam which is flashed flow back to a deaerator steam discharge pipeline 14 through a separator steam discharge pipeline 15, then the steam enters the heat exchanger 2 again through the deaerator steam discharge pipeline 14 to exchange heat with normal-temperature desalted water, the steam is further reused, the waste of steam heat is avoided, after the condensate entering the steam condensate separator 17 reaches a certain liquid level, a condensate regulating valve 20 is opened, the condensate of the steam condensate separator 17 enters a condensate collecting tank 21 through a separator condensate discharge pipeline 19, and the desalted water recovered by the condensate collecting tank 21 is conveyed to a water utilization facility under the action of a water suction pump 22.
Claims (8)
1. The utility model provides a phthalic anhydride device heating power oxygen-eliminating device steam recovery system, includes demineralized water tank (7), and demineralized water tank (7) bottom external water facility, demineralized water tank (7) inner chamber lower part are equipped with steam distribution pipe (5), and external steam admission pipe (11) of steam distribution pipe (5), demineralized water tank (7) top are equipped with oxygen-eliminating device (10), its characterized in that: one side of the upper portion of the deaerator (10) is communicated with a heating pipeline outlet of the heat exchanger (2) through a deaerator water inlet pipeline (13), a heating pipeline inlet of the heat exchanger (2) is externally connected with a water storage device of a water treatment workshop, the other side of the upper portion of the deaerator (10) is communicated with a cooling pipeline inlet of the heat exchanger (2) through a deaerator steam outer discharge pipeline (14), a cooling pipeline outlet of the heat exchanger (2) is communicated with one end of a heat exchanger condensate pipeline (16), and the other end of the heat exchanger condensate pipeline (16) is communicated with a condensate treatment unit.
2. The phthalic anhydride plant thermal deaerator steam recovery system of claim 1, characterized in that: the condensate treatment unit comprises a steam condensate separator (17), one side of the steam condensate separator (17) is communicated with a heat exchanger condensate pipeline (16), the top of the steam condensate separator (17) is communicated with a deaerator steam discharge pipeline (14) through a separator steam discharge pipeline (15), the bottom of the steam condensate separator (17) is communicated with a condensate collection tank (21) water inlet through a separator condensate discharge pipeline (19), and a condensate collection tank (21) water outlet is externally connected with a water suction pump (22).
3. The phthalic anhydride plant thermal deaerator steam recovery system of claim 2, characterized in that: a first liquid level meter (18) is arranged on the steam condensate separator (17), and a condensate regulating valve (20) is arranged on a condensate discharge pipeline (19) of the separator.
4. The phthalic anhydride plant thermal deaerator steam recovery system of claim 1, characterized in that: a safety valve (8) and a pressure gauge (4) are arranged on the desalted water tank (7).
5. The phthalic anhydride plant thermal deaerator steam recovery system of claim 1, characterized in that: a second liquid level meter (6) is also arranged on the desalted water tank (7), and a water injection regulating valve (12) is arranged on a deaerator water inlet pipeline (13).
6. The phthalic anhydride plant thermal deaerator steam recovery system of any of claims 1-5, characterized in that: an emptying valve (9) is also arranged on the deaerator steam discharging pipeline (14).
7. The phthalic anhydride plant thermal deaerator steam recovery system of claim 1, characterized in that: the inlet of the heating pipeline of the heat exchanger (2) is externally connected with a water storage device of a water treatment workshop through a desalted water inlet pipe (1).
8. The phthalic anhydride plant thermal deaerator steam recovery system of claim 7, characterized in that: a heat exchanger bypass pipe (3) is arranged on one side of the heat exchanger (2), two ends of the heat exchanger bypass pipe (3) are respectively communicated with the desalted water inlet pipe (1) and the deaerator water inlet pipeline (13), and a switch valve is further arranged on the heat exchanger bypass pipe (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220317352.XU CN216946283U (en) | 2022-02-17 | 2022-02-17 | Steam recovery system of thermal deaerator of phthalic anhydride device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220317352.XU CN216946283U (en) | 2022-02-17 | 2022-02-17 | Steam recovery system of thermal deaerator of phthalic anhydride device |
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| Publication Number | Publication Date |
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| CN216946283U true CN216946283U (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220317352.XU Active CN216946283U (en) | 2022-02-17 | 2022-02-17 | Steam recovery system of thermal deaerator of phthalic anhydride device |
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| CN (1) | CN216946283U (en) |
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2022
- 2022-02-17 CN CN202220317352.XU patent/CN216946283U/en active Active
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