CN217330822U - Desalted water heating system of phthalic anhydride device - Google Patents
Desalted water heating system of phthalic anhydride device Download PDFInfo
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- CN217330822U CN217330822U CN202220996267.0U CN202220996267U CN217330822U CN 217330822 U CN217330822 U CN 217330822U CN 202220996267 U CN202220996267 U CN 202220996267U CN 217330822 U CN217330822 U CN 217330822U
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
The utility model relates to a phthalic anhydride production heat processing apparatus technical field, concretely relates to phthalic anhydride device demineralized water heating system. The desalted water heating system of the phthalic anhydride device comprises a primary heater and a secondary heater, wherein a water inlet of the primary heater is connected with a desalted water inlet pipeline, a steam inlet of the primary heater is connected with a low-quality steam pipeline, a discharging and condensing port of the primary heater is connected with a low-pressure condensate pipeline, a water outlet of the primary heater is connected with a water inlet of the secondary heater through a heat exchanger serial pipe, a desalted water outlet of the secondary heater is connected with a high-temperature desalted water outlet pipeline, a steam inlet of the secondary heater is connected with a high-quality steam pipeline, and a discharging and condensing port of the secondary heater is connected with a high-pressure condensate pipeline. The utility model discloses use the two-stage heater, utilized outer extravagant low-quality steam of arranging to preheat the demineralized water and heaied up, the rational utilization the energy, and the switching that utilizes two heaters can deal with the heat exchanger and leak the condition, realize the continuity of operation.
Description
Technical Field
The utility model relates to a phthalic anhydride production heat processing apparatus technical field, concretely relates to phthalic anhydride device demineralized water heating system.
Background
Phthalic anhydride, known collectively as phthalic anhydride, is a cyclic anhydride formed by intramolecular dehydration of phthalic acid. The phthalic anhydride is mainly used for producing PVC plasticizers, unsaturated polyesters, alkyd resins, dyes, coatings, pesticides, medicine and instrument additives, edible saccharin and the like, and is an important organic chemical raw material.
At present, two relatively mature processes of naphthalene method and ortho method are available for producing phthalic anhydride. In the production process of preparing phthalic anhydride by gas-phase oxidation of o-xylene, a large amount of heat is released in the reaction, and high-temperature desalted water is needed to take away the heat of the reaction, so that steam with different qualities is generated. In the production process, a large amount of heat energy is consumed to heat normal-temperature desalted water, and the normal-temperature desalted water is used for a phthalic anhydride production device, so that the use amount of high-temperature desalted water is large, the energy consumption is increased, and the production cost is increased.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the utility model provides a phthalic anhydride device demineralized water heating system uses the two-stage heater, has utilized the extravagant low-quality steam of outer row to preheat the demineralized water and has risen temperature, the rational utilization the energy, and the switching that utilizes two heaters can deal with the heat exchanger and leak the condition, realizes continuity of operation.
The desalted water heating system of the phthalic anhydride device of the utility model comprises a primary heater and a secondary heater; the primary heater is provided with a primary heater water inlet, a primary heater water outlet, a primary heater steam inlet and a primary heater condensation discharge port; the secondary heater is provided with a secondary heater water inlet, a secondary heater desalted water outlet, a secondary heater steam inlet and a secondary heater condensation discharge port; the water inlet of the primary heater is connected with a desalted water inlet pipeline, the steam inlet of the primary heater is connected with a low-quality steam pipeline, the condensate discharging port of the primary heater is connected with a low-pressure condensate pipeline, the water outlet of the primary heater is connected with the water inlet of the secondary heater through a heat exchanger serial pipe, the desalted water outlet of the secondary heater is connected with a high-temperature desalted water outlet pipeline, the steam inlet of the secondary heater is connected with a high-quality steam pipeline, and the condensate discharging port of the secondary heater is connected with a high-pressure condensate pipeline; the low-quality steam pipeline and the high-quality steam pipeline are communicated through steam bypass pipes, the low-pressure condensate pipeline and the high-pressure condensate pipeline are communicated through condensate bypass pipes, the desalted water inlet pipeline and the high-temperature desalted water outlet pipeline are communicated through desalted water bypass pipes, and the desalted water bypass pipes and the heat exchanger series-connection pipes are communicated through heat exchanger bypass pipes.
As a preferred scheme, a 4# bypass valve is arranged on the steam bypass pipe, a 5# bypass valve is arranged on the condensate bypass pipe, a 2# bypass valve is arranged on the heat exchanger bypass pipe, and a 1# bypass valve and a 3# bypass valve are arranged on the desalted water bypass pipe.
As a preferred scheme, a thermometer and a desalted water outlet valve of a secondary heater are arranged on a high-temperature desalted water outlet pipeline.
As a preferred scheme, a secondary heater steam inlet valve and a high-quality steam inlet valve group are arranged on the high-quality steam pipeline.
As a preferred scheme, a secondary heater condensation discharging valve and a secondary heater high-pressure section condensation discharging valve group are arranged on the high-pressure condensation pipeline.
As a preferred scheme, a low-quality steam inlet valve is arranged on the low-quality steam pipeline.
As a preferred scheme, a primary heater water inlet valve is arranged on the desalted water inlet pipeline.
As a preferred scheme, a primary heater condensation discharging valve and a primary heater low-pressure section condensation discharging valve group are arranged on the low-pressure condensation liquid pipeline.
As a preferred scheme, a primary heater water outlet valve and a secondary heater water inlet valve are arranged on the heat exchanger serial pipe.
In the production process of phthalic anhydride, high-temperature desalted water is needed to take away the reaction heat to generate steam. The system of the utility model utilizes the two-stage heater to heat the desalted water after the deoxidization treatment step by step, and the high-temperature desalted water meeting the process requirements is reached. The purpose of two-stage heating is to preheat desalted water by using low-quality steam which is abundant in a one-stage heater consumption device, because the low-quality steam has few users and low value and cannot be discharged and wasted, and then the high-quality steam is used for temperature control to reach the temperature meeting the requirement.
Meanwhile, the heat exchanger is frequently leaked in the using process, once the leakage inevitably leads to the shutdown of the device, the two-stage heating utilizes the valve to switch under the condition that any group of heat exchanger leaks, high-quality steam is used for heating another group of normal heat exchanger, the requirement of production can be met without stopping the device, the driving rate of the device is improved, and the benefit is created.
The working process of the desalted water heating system of the phthalic anhydride device is as follows:
normal operating conditions: opening a desalted water outlet valve of a secondary heater, a steam inlet valve of the secondary heater, a high-quality steam inlet valve group, a condensate discharging valve of the secondary heater, a condensate discharging valve group of a high-pressure section of the secondary heater, a low-quality steam inlet valve, a water inlet valve of a primary heater, a condensate discharging valve of the primary heater, a condensate discharging valve group of a low-pressure section of the primary heater, a water outlet valve of the primary heater and a water inlet valve of the secondary heater;
at this time, the # 1 bypass valve, the # 2 bypass valve, the # 3 bypass valve, the # 4 bypass valve and the # 5 bypass valve are all in a closed state. Fresh desalted water from which oxygen is removed enters a primary heater through a water inlet of the primary heater, heat exchange is carried out between the fresh desalted water and low-quality steam, and condensate after heat exchange enters a low-pressure condensate pipeline through a condensate discharging port of the primary heater. The desalted water after the primary heating passes through a water outlet of the primary heater and enters the secondary heater through a water inlet of the secondary heater, the desalted water exchanges heat with high-quality steam, and condensate after heat exchange enters a high-pressure condensate pipeline through a condensate discharging port of the secondary heater. The temperature of the desalted water is displayed by a thermometer at the outlet of the secondary heater, and the temperature is controlled to meet the requirement by adjusting a high-quality steam inlet valve bank. The configuration can consume part of low-quality steam, save energy and meet the temperature of desalted water required by the process.
And secondly, when the primary heater leaks, opening a No. 2 bypass valve and a No. 3 bypass valve, closing a water inlet valve of the primary heater, and closing a water outlet valve of the primary heater, a low-quality steam inlet valve, a condensation discharging valve of the primary heater and a condensation discharging valve group at a low-pressure section of the primary heater. At the moment, a secondary heater condensation discharging valve, a secondary heater high-pressure section condensation discharging valve group, a high-quality steam inlet valve group, a secondary heater steam inlet valve, a secondary heater desalted water outlet valve and a secondary heater water inlet valve are opened. The 1# bypass valve, the 4# bypass valve and the 5# bypass valve are all in a closed state. The primary heater is taken out, and the high-quality steam is used for heating and controlling the desalted water passing through the secondary heater, so that the temperature of the desalted water meeting the process requirement is reached.
And thirdly, when the secondary heater leaks, opening a 1# bypass valve, a 2# bypass valve, a 4# bypass valve and a 5# bypass valve, closing a 3# bypass valve, closing a secondary heater water inlet valve, a secondary heater desalted water outlet valve, a secondary heater steam inlet valve, a low-quality steam inlet valve, a secondary heater drainage valve and a primary heater low-pressure section drainage valve group, and opening a high-quality steam inlet valve group, a primary heater drainage valve, a secondary heater high-pressure section drainage valve group, a primary heater water inlet valve and a primary heater water outlet valve. And (4) taking out the secondary heater, heating the desalted water passing through the primary heater by using high-quality steam, and controlling the temperature by using a high-quality steam inlet valve group so as to reach the temperature of the desalted water required by the process.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the desalted water heating system of the phthalic anhydride device of the utility model uses a two-stage heater, and utilizes the low-quality steam wasted by the discharge to preheat and heat the desalted water, thereby reasonably utilizing the energy;
(2) the utility model discloses utilize the switching of steam valve, arrange and congeal valves and each bypass valve, can realize the switching between two heat exchangers, pluck the heat exchanger that the leakage appears, normal a set of heat exchanger utilizes high-quality steam to heat up the demineralized water, when having satisfied the technological requirement, does not need to install the parking and handles.
Drawings
FIG. 1 is a schematic structural view of a desalted water heating system of a phthalic anhydride device of the present invention;
in the figure: 1. a high-temperature desalted water outlet pipeline; 2. a thermometer; 3. a desalted water outlet valve of the secondary heater; 4. a desalted water outlet of the secondary heater; 5. a secondary heater steam inlet valve; 6. a secondary heater steam inlet; 7. a high quality steam admission valve bank; 8. a high quality steam line; 9. a water inlet of the secondary heater; 10. a water inlet valve of the secondary heater; 11. a secondary heater condensation discharge port; 12. a secondary heater condensation discharge valve; 13. a condensation discharge valve group at the high-pressure section of the secondary heater; 14. a high pressure condensate line; 15. a secondary heater; 16. 1# bypass valve; 17. a # 2 bypass valve; 18. 3# bypass valve; 19. 4# bypass valve; 20. 5# bypass valve; 21. a water outlet valve of the primary heater; 22. a water outlet of the primary heater; 23. a primary heater steam inlet; 24. a low quality steam inlet valve; 25. a low quality steam line; 26. a primary heater water inlet; 27. a water inlet valve of the primary heater; 28. a desalted water inlet pipeline; 29. a primary heater condensation discharge port; 30. a first-stage heater condensation discharge valve; 31. a condensation discharge valve group at the low-pressure section of the primary heater; 32. a low pressure condensate line; 33. a primary heater; 34. a condensate bypass pipe; 35. a steam bypass pipe; 36. a desalted water bypass pipe; 37. a heat exchanger bypass pipe; 38. the heat exchanger is connected with a pipe in series.
Detailed Description
The following will describe in detail specific embodiments of the present invention. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
As shown in fig. 1, the desalted water heating system of the phthalic anhydride device of the present invention comprises a primary heater 33 and a secondary heater 15; the primary heater 33 is provided with a primary heater water inlet 26, a primary heater water outlet 22, a primary heater steam inlet 23 and a primary heater condensation discharge port 29; the secondary heater 15 is provided with a secondary heater water inlet 9, a secondary heater desalted water outlet 4, a secondary heater steam inlet 6 and a secondary heater condensation discharge port 11; wherein the water inlet 26 of the primary heater is connected with a desalted water inlet pipeline 28, the steam inlet 23 of the primary heater is connected with a low-quality steam pipeline 25, the condensate discharging port 29 of the primary heater is connected with a low-pressure condensate pipeline 32, the water outlet 22 of the primary heater is connected with the water inlet 9 of the secondary heater through a heat exchanger serial pipe 38, the desalted water outlet 4 of the secondary heater is connected with a high-temperature desalted water outlet pipeline 1, the steam inlet 6 of the secondary heater is connected with a high-quality steam pipeline 8, and the condensate discharging port 11 of the secondary heater is connected with a high-pressure condensate pipeline 14; the low-quality steam pipeline 25 is communicated with the high-quality steam pipeline 8 through a steam bypass pipe 35, the low-pressure condensate pipeline 32 is communicated with the high-pressure condensate pipeline 14 through a condensate bypass pipe 34, the desalted water inlet pipeline 28 is communicated with the high-temperature desalted water outlet pipeline 1 through a desalted water bypass pipe 36, and the desalted water bypass pipe 36 is communicated with a heat exchanger serial pipe 38 through a heat exchanger bypass pipe 37.
The steam bypass pipe 35 is provided with a 4# bypass valve 19, the condensate bypass pipe 34 is provided with a 5# bypass valve 20, the heat exchanger bypass pipe 37 is provided with a 2# bypass valve 17, and the desalted water bypass pipe 36 is provided with a 1# bypass valve 16 and a 3# bypass valve 18.
A thermometer 2 and a second-stage heater desalted water outlet valve 3 are arranged on the high-temperature desalted water outlet pipeline 1.
A secondary heater steam inlet valve 5 and a high-quality steam inlet valve group 7 are arranged on the high-quality steam pipeline 8.
And a secondary heater condensation discharging valve 12 and a secondary heater high-pressure section condensation discharging valve group 13 are arranged on the high-pressure condensation pipeline 14.
A low-quality steam inlet valve 24 is arranged on the low-quality steam pipeline 25.
A primary heater water inlet valve 27 is arranged on the desalted water inlet pipeline 28.
The low-pressure condensate pipeline 32 is provided with a primary heater condensate discharging valve 30 and a primary heater low-pressure section condensate discharging valve group 31.
The heat exchanger serial pipe 38 is provided with a primary heater water outlet valve 21 and a secondary heater water inlet valve 10.
In the production process of phthalic anhydride, high-temperature desalted water is needed to take away the reaction heat to generate steam. The system of the utility model utilizes the two-stage heater to heat the desalted water after the deoxidization treatment step by step, and the high-temperature desalted water meeting the process requirements is reached. The purpose of two-stage heating is to preheat desalted water by using abundant low-quality steam of a first-stage heater consumption device, because the low-quality steam has few users and low value and cannot be discharged and wasted, and then the high-quality steam is used for temperature control to reach the temperature meeting the requirement.
Meanwhile, the heat exchangers are frequently leaked in the use process, once the device is inevitably stopped due to leakage, the two-stage heating utilizes the valve switching to heat the other normal heat exchanger under the condition that any heat exchanger group leaks, the requirement of production can be met without stopping, the driving rate of the device is improved, and benefits are created.
The working process of the desalted water heating system of the phthalic anhydride device is as follows:
normal operating conditions: opening a secondary heater desalted water outlet valve 3, a secondary heater steam inlet valve 5, a high-quality steam inlet valve group 7, a secondary heater condensation discharging valve 12, a secondary heater high-pressure section condensation discharging valve group 13, a low-quality steam inlet valve 24, a primary heater water inlet valve 27, a primary heater condensation discharging valve 30, a primary heater low-pressure section condensation discharging valve group 31, a primary heater water outlet valve 21 and a secondary heater water inlet valve 10;
at this time, the # 1 bypass valve 16, the # 2 bypass valve 17, the # 3 bypass valve 18, the # 4 bypass valve 19, and the # 5 bypass valve 20 are all in the closed state. Fresh desalted water from which oxygen is removed enters a primary heater 33 through a primary heater water inlet 26, heat exchange is carried out between the fresh desalted water and low-quality steam, and condensate after heat exchange enters a low-pressure condensate pipeline 32 through a primary heater condensate discharging port 29. The desalted water after primary heating passes through a water outlet 22 of the primary heater and enters a secondary heater 15 through a water inlet 9 of the secondary heater, heat exchange is carried out between the desalted water and high-quality steam, and condensate after heat exchange enters a high-pressure condensate pipeline 14 through a condensate discharging port 11 of the secondary heater. The temperature of desalted water is displayed by a thermometer 2 at the outlet of the secondary heater 15, and the temperature is controlled to meet the requirement by adjusting a high-quality steam inlet valve bank 7. The configuration can consume part of low-quality steam, save energy and meet the desalted water temperature required by the process.
Secondly, when the primary heater 33 leaks, the 2# bypass valve 17 and the 3# bypass valve 18 are opened, the primary heater water inlet valve 27 is closed, and the primary heater water outlet valve 21, the low-quality steam inlet valve 24, the primary heater condensation discharging valve 30 and the primary heater low-pressure section condensation discharging valve group 31 are closed. At this time, the secondary heater condensate discharging valve 12, the secondary heater high-pressure section condensate discharging valve group 13, the high-quality steam inlet valve group 7, the secondary heater steam inlet valve 5, the secondary heater desalted water outlet valve 3 and the secondary heater water inlet valve 10 are opened. The # 1 bypass valve 16, the # 4 bypass valve 19, and the # 5 bypass valve 20 are all in the closed state. The primary heater is removed, and the temperature of the desalted water passing through the secondary heater 15 is controlled by high-quality steam, so that the temperature of the desalted water required by the process is achieved.
③ when the secondary heater 15 leaks, the 1# bypass valve 16, the 2# bypass valve 17, the 4# bypass valve 19 and the 5# bypass valve 20 are opened, at this time, the 3# bypass valve 18 is closed, the secondary heater water inlet valve 10 is closed, the secondary heater desalted water outlet valve 3, the secondary heater steam inlet valve 5, the low-quality steam inlet valve 24, the secondary heater condensation discharging valve 12 and the primary heater low-pressure section condensation discharging valve group 31 are closed, the high-quality steam inlet valve group 7, the primary heater condensation discharging valve 30, the secondary heater high-pressure section condensation discharging valve group 13, the primary heater water inlet valve 27 and the primary heater water outlet valve 21 are opened. The secondary heater 15 is taken out, the desalted water passing through the primary heater 33 is heated by high-quality steam, and the temperature is controlled by the high-quality steam inlet valve group 7 so as to reach the temperature of the desalted water required by the process.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a phthalic anhydride device demineralized water heating system which characterized in that: comprises a primary heater (33) and a secondary heater (15); the primary heater (33) is provided with a primary heater water inlet (26), a primary heater water outlet (22), a primary heater steam inlet (23) and a primary heater condensation discharge port (29); the secondary heater (15) is provided with a secondary heater water inlet (9), a secondary heater desalted water outlet (4), a secondary heater steam inlet (6) and a secondary heater condensation discharge port (11); wherein a water inlet (26) of the primary heater is connected with a desalted water inlet pipeline (28), a steam inlet (23) of the primary heater is connected with a low-quality steam pipeline (25), a condensate discharging port (29) of the primary heater is connected with a low-pressure condensate pipeline (32), a water outlet (22) of the primary heater is connected with a water inlet (9) of the secondary heater through a heat exchanger series pipe (38), a desalted water outlet (4) of the secondary heater is connected with a high-temperature desalted water outlet pipeline (1), a steam inlet (6) of the secondary heater is connected with a high-quality steam pipeline (8), and a condensate discharging port (11) of the secondary heater is connected with a high-pressure condensate pipeline (14); the low-quality steam pipeline (25) is communicated with the high-quality steam pipeline (8) through a steam bypass pipe (35), the low-pressure condensate pipeline (32) is communicated with the high-pressure condensate pipeline (14) through a condensate bypass pipe (34), the desalted water inlet pipeline (28) is communicated with the high-temperature desalted water outlet pipeline (1) through a desalted water bypass pipe (36), and the desalted water bypass pipe (36) is communicated with a heat exchanger serial pipe (38) through a heat exchanger bypass pipe (37).
2. The phthalic anhydride plant desalted water heating system of claim 1, wherein: a4 # bypass valve (19) is arranged on the steam bypass pipe (35), a 5# bypass valve (20) is arranged on the condensate bypass pipe (34), a 2# bypass valve (17) is arranged on the heat exchanger bypass pipe (37), and a 1# bypass valve (16) and a 3# bypass valve (18) are arranged on the desalted water bypass pipe (36).
3. The phthalic anhydride plant desalted water heating system of claim 1, wherein: a thermometer (2) and a desalted water outlet valve (3) of a secondary heater are arranged on the high-temperature desalted water outlet pipeline (1).
4. The phthalic anhydride plant desalted water heating system of claim 1, wherein: a secondary heater steam inlet valve (5) and a high-quality steam inlet valve group (7) are arranged on the high-quality steam pipeline (8).
5. The phthalic anhydride plant desalted water heating system of claim 1, wherein: a secondary heater condensation discharging valve (12) and a secondary heater high-pressure section condensation discharging valve group (13) are arranged on the high-pressure condensation pipeline (14).
6. The phthalic anhydride plant desalted water heating system of claim 1, wherein: and a low-quality steam inlet valve (24) is arranged on the low-quality steam pipeline (25).
7. The phthalic anhydride plant desalted water heating system of claim 1, wherein: a primary heater water inlet valve (27) is arranged on the desalted water inlet pipeline (28).
8. The phthalic anhydride plant desalted water heating system of claim 1, wherein: a primary heater condensation discharging valve (30) and a primary heater low-pressure section condensation discharging valve group (31) are arranged on the low-pressure condensation pipeline (32).
9. The phthalic anhydride plant desalted water heating system of claim 1, wherein: a primary heater water outlet valve (21) and a secondary heater water inlet valve (10) are arranged on the heat exchanger serial pipe (38).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220996267.0U CN217330822U (en) | 2022-04-27 | 2022-04-27 | Desalted water heating system of phthalic anhydride device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220996267.0U CN217330822U (en) | 2022-04-27 | 2022-04-27 | Desalted water heating system of phthalic anhydride device |
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| CN217330822U true CN217330822U (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220996267.0U Active CN217330822U (en) | 2022-04-27 | 2022-04-27 | Desalted water heating system of phthalic anhydride device |
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| CN (1) | CN217330822U (en) |
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- 2022-04-27 CN CN202220996267.0U patent/CN217330822U/en active Active
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