High-pressure steam source replacement system based on main steam supply period

Abstract

The utility model relates to the field of steam supply systems, in particular to a high-pressure steam supply source substitution system based on a main steam supply period, which comprises a boiler, a # 2 high-pressure steam supply source tank, a high-pressure steam supply header, a low-pressure steam supply header and a cold and hot remixing steam supply pipeline, a fifth valve is arranged at the output end of the second high-pressure heater steam source tank, the replacement steam source pipeline is communicated with the cold and hot remixing steam supply pipeline through the output end of the second high-pressure heater steam source tank, in the main steam pressure reduction steam supply period, the fifth valve can be closed, the replacement steam source is used for replacing the second high-pressure heater steam source, the main steam supply amount can be increased, and the main steam temperature reduction and pressure reduction steam supply amount is increased by 10%.

Description

Technical Field

[0001] The utility model relates to the field of steam supply systems, in particular to a high pressure steam source replacement system based on main steam supply period. Background Art

[0002] In order to supply high-pressure steam to the outside during deep peak regulation, the thermal power plant increases the temperature and pressure reduction of the main steam before supplying steam to the outside. During deep peak regulation, the main steam is supplied to the high-pressure manifold after temperature and pressure reduction, and the cold and hot steam are mixed before being supplied to the low-pressure manifold for steam supply.

[0003] However, the prior art has the following defects:

[0004] After the boiler cold re-extracts steam, the reheater will be insufficiently cooled, which may easily cause the reheater wall temperature to overheat. Therefore, the cold re-extraction volume generally does not exceed 10% of the reheater steam flow, resulting in the main steam cooling and pressure reduction steam supply volume not exceeding 10% of the main steam flow, which cannot meet user needs when the user's steam consumption is large. Utility Model Content

[0005] The utility model aims to provide a high pressure steam source replacement system based on the main steam supply period to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-pressure steam source replacement system based on main steam supply, comprising a boiler, a #2 high-pressure steam source tank, a high-pressure steam supply header, a low-pressure steam supply header and a hot and cold remixing steam supply pipeline, the output end of the boiler is connected and installed with a first bypass and a second bypass, the first bypass is connected to the hot and cold remixing steam supply pipeline, the input end of the hot and cold remixing steam supply pipeline is fixedly installed with a #2 high-pressure steam source tank, the #2 high-pressure steam source tank and the hot and cold remixing steam supply pipeline are connected with an alternative steam source pipeline, the input end of the alternative steam source pipeline is connected with the second bypass, the two ends of the alternative steam source pipeline are respectively provided with a third valve and a sixth valve, a second high-pressure discharge check valve and a second valve are provided between the hot and cold remixing steam supply pipeline and the #2 high-pressure steam source tank, and a first high-pressure discharge check valve is provided at the end of the hot and cold remixing steam supply pipeline.

[0007] By adopting the above technical scheme, during the period of main steam desuperheating and pressure reduction, the #2 high-pressure cold re-steam source is replaced with a desuperheated hot re-steam source. The steam extraction volume after main steam desuperheating and pressure reduction can increase the main steam flow by 10%, thereby increasing the steam supply volume. The alternative steam source pipeline is connected to the cold and hot re-mixing steam supply pipeline, and the alternative steam source can directly enter the cold and hot re-mixing steam supply pipeline to mix with steam for steam supply, thereby increasing the steam supply volume.

[0008] A superheater and a first reheater are provided in the boiler, and the superheater is connected in parallel with the first reheater.

[0009] By adopting the above technical solution, the superheater and the first reheater can be heated to generate main steam, and the superheater and the first reheater are connected in parallel and can be used separately without affecting each other.

[0010] The output end of the second bypass is provided with a second reheater and a first valve in sequence, and a fourth valve is provided between the second bypass and the high-pressure steam supply manifold.

[0011] By adopting the above technical solution, the second reheater can heat the main steam in the pipeline to prevent the steam from cooling.

[0012] A third reheater is fixedly installed on one side of the top of the high-pressure steam supply header, and a fourth reheater is fixedly installed on one side of the top of the low-pressure steam supply header.

[0013] By adopting the above technical solution, the third reheater and the fourth reheater heat the inside of the high-pressure steam supply header and the low-pressure steam supply header respectively, which can prevent the gas from condensing into water.

[0014] The output end of the low-pressure steam supply manifold is provided with a check valve, a balancing valve and a seventh valve in sequence, and the output end of the #2 high-pressure steam source tank is provided with a fifth valve.

[0015] By adopting the above technical solution, the check valve can prevent the backflow of gas delivered by the low-pressure steam supply manifold, the balancing valve ensures the balance of internal and external air pressure, the seventh valve can open and close the low-pressure steam supply manifold, and the fifth valve can open and close the #2 high-pressure steam source tank.

[0016] The end of the cold and hot remixing steam supply pipeline away from the first bypass is connected in parallel with the hot resupply steam pipeline and the cold resupply steam pipeline, and the end of the hot resupply steam pipeline away from the cold and hot remixing steam supply pipeline is provided with a tenth valve, a second regulating valve, a fifth reheater and an eleventh valve in sequence.

[0017] By adopting the above technical solution, the second regulating valve can adjust the gas transportation speed of the hot steam resupply pipeline, the fifth reheater can ensure the constant gas temperature inside the hot steam resupply pipeline, and the tenth valve and the eleventh valve play the role of opening and closing the hot steam resupply pipeline.

[0018] The end of the cold re-steam supply pipeline away from the cold and hot re-mixing steam supply pipeline is provided with a ninth valve, a condenser, a first regulating valve and an eighth valve in sequence.

[0019] By adopting the above technical solution, the first regulating valve can adjust the gas transportation speed of the cold steam resupply pipeline, the condenser can cool the steam to ensure the cold steam resupply, and the ninth valve and the eighth valve play the role of opening and closing the cold steam resupply pipeline.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The hot and cold remixing heating pipeline is connected to the #2 high-pressure heater inlet steam source pipe, serving as an alternative steam source for the #2 high-pressure heater. During the main steam temperature reduction and pressure reduction steam supply period, the hot and cold resupply steam mother pipe adopts hot resupply steam, and the #2 high-pressure heater steam source is switched to the alternative steam source, achieving a 10% increase in the main steam temperature reduction and pressure reduction steam supply, and being able to increase the steam supply during the main steam temperature reduction and pressure reduction steam supply period. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the system of the utility model.

[0023] In the figure: 1. Boiler; 2. Superheater; 3. First reheater; 4. First bypass; 5. First high-pressure exhaust check valve; 6. Second bypass; 7. Second reheater; 8. First valve; 9. Second valve; 10. Third valve; 11. Fourth valve; 12. Alternative source pipeline; 13. Fifth valve; 14. #2 high-pressure steam source tank; 15. Sixth valve; 16. Seventh valve; 17. Balance valve; 18. Check valve; 19. High-pressure steam supply manifold; 20. Third reheater; 21. Low-pressure steam supply manifold; 22. Fourth reheater; 23. Eighth valve; 24. First regulating valve; 25. Condenser; 26. Ninth valve; 27. Tenth valve; 28. Second regulating valve; 29. ​​Fifth reheater; 30. Eleventh valve; 31. Cold re-steam supply pipeline; 32. Hot re-steam supply pipeline; 33. Cold and hot re-mixed steam supply pipeline; 34. Second high-discharge check valve. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1The utility model provides a high-pressure steam source replacement system based on the main steam supply period, including a boiler 1, a #2 high-pressure steam source tank 14, a high-pressure steam supply header 19, a low-pressure steam supply header 21 and a cold and hot remix steam supply pipeline 33. The output end of the boiler 1 is connected with a first bypass 4 and a second bypass 6, the first bypass 4 is connected with the cold and hot remix steam supply pipeline 33, and the input end of the cold and hot remix steam supply pipeline 33 is fixedly installed with a #2 high-pressure steam source tank 14. The #2 high-pressure steam source tank 14 and the cold and hot remix steam supply pipeline 33 are connected. An alternative steam source pipeline 12 is connected, and the input end of the alternative steam source pipeline 12 is connected to the second bypass 6. A third valve 10 and a sixth valve 15 are respectively provided at both ends of the alternative steam source pipeline 12. A second high-pressure exhaust check valve 34 and a second valve 9 are provided between the cold and hot remixing steam supply pipeline 33 and the #2 high-pressure steam source tank 14. A first high-pressure exhaust check valve 5 is provided at the end of the cold and hot remixing steam supply pipeline 33. The alternative steam source pipeline 12 is connected to the cold and hot remixing steam supply pipeline 33. The alternative steam source can replace the #2 high-pressure steam source to increase the steam supply.

[0026] A superheater 2 and a first reheater 3 are provided in the boiler 1. The superheater 2 and the first reheater 3 are connected in parallel. The boiler 1 can be heated to generate main steam. The superheater 2 and the first reheater 3 can be used separately without affecting each other.

[0027] The output end of the second bypass 6 is provided with a second reheater 7 and a first valve 8 in sequence, and a fourth valve 11 is provided between the second bypass 6 and the high-pressure steam supply manifold 19. The second reheater 7 can be heated, and the first valve 8 and the fourth valve 11 can control the delivery of steam in the second bypass 6.

[0028] A third reheater 20 is fixedly installed on one side of the top of the high-pressure steam supply manifold 19, and a fourth reheater 22 is fixedly installed on one side of the top of the low-pressure steam supply manifold 21. The third reheater 20 and the fourth reheater 22 can heat the inside of the high-pressure steam supply manifold 19 and the low-pressure steam supply manifold 21 to prevent steam from condensing into water.

[0029] The output end of the low-pressure steam supply manifold 21 is provided with a check valve 18, a balancing valve 17 and a seventh valve 16 in sequence, and the output end of the #2 high-pressure steam source tank 14 is provided with a fifth valve 13. The check valve 18 can prevent steam backflow, and the balancing valve 17 ensures the balance of internal and external pressures.

[0030] One end of the cold and hot remixing steam supply pipeline 33 away from the first bypass 4 is connected in parallel with the hot resupply steam pipeline 32 and the cold resupply steam pipeline 31, and one end of the hot resupply steam pipeline 32 away from the cold and hot remixing steam supply pipeline 33 is provided with a tenth valve 27, a second regulating valve 28, a fifth reheater 29 and an eleventh valve 30 in sequence. The second regulating valve 28 can adjust the steam supply speed, and the fifth reheater 29 can heat the gas in the hot resupply steam pipeline 32.

[0031] The end of the cold re-steam supply pipeline 31 away from the cold and hot re-mixing steam supply pipeline 33 is provided with a ninth valve 26, a condenser 25, a first regulating valve 24 and an eighth valve 23 in sequence. The condenser 25 can prevent the gas from overheating and causing damage to the cold re-steam supply pipeline 31.

[0032] Working principle: When the utility model is used, the boiler 1 is first turned on, and the superheater 2 and the first reheater 3 are turned on for heating to generate main steam. The main steam is mixed with the steam provided by the high-pressure steam supply manifold 19 through the second bypass 6. During the main steam temperature reduction and pressure reduction steam supply period, the cold re-steam supply pipeline 31 and the hot re-steam supply pipeline 32 use hot re-steam supply, and the #2 high-pressure steam source is switched to an alternative steam source. The alternative steam source enters the cold and hot re-mixing steam supply pipeline 33 through the alternative steam source pipeline 12, thereby achieving a 10% increase in the main steam temperature reduction and pressure reduction steam supply, greatly improving the steam supply.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high pressure steam source replacement system based on main steam supply period, comprising a boiler (1), a #2 high pressure steam source tank (14), a high pressure steam supply header (19), a low pressure steam supply header (21) and a cold and hot remix steam supply pipeline (33), characterized in that: The output end of the boiler (1) is connected to a first bypass (4) and a second bypass (6), the first bypass (4) is connected to a cold and hot remixing steam supply pipeline (33), a #2 high-pressure steam source tank (14) is fixedly installed at the input end of the cold and hot remixing steam supply pipeline (33), an alternative steam source pipeline (12) is connected between the #2 high-pressure steam source tank (14) and the cold and hot remixing steam supply pipeline (33), the input end of the alternative steam source pipeline (12) is connected to the second bypass (6), a third valve (10) and a sixth valve (15) are respectively provided at both ends of the alternative steam source pipeline (12), a second high-pressure discharge check valve (34) and a second valve (9) are provided between the cold and hot remixing steam supply pipeline (33) and the #2 high-pressure steam source tank (14), and a first high-pressure discharge check valve (5) is provided at the end of the cold and hot remixing steam supply pipeline (33).

2. The high pressure steam source replacement system based on the main steam supply period according to claim 1 is characterized in that: The boiler (1) is provided with a superheater (2) and a first reheater (3), and the superheater (2) and the first reheater (3) are connected in parallel.

3. The high pressure steam source replacement system based on the main steam supply period according to claim 1 is characterized in that: The output end of the second bypass (6) is provided with a second reheater (7) and a first valve (8) in sequence, and a fourth valve (11) is provided between the second bypass (6) and the high-pressure steam supply manifold (19).

4. The high pressure steam source replacement system based on the main steam supply period according to claim 1 is characterized in that: A third reheater (20) is fixedly mounted on one side of the top of the high-pressure steam supply header (19), and a fourth reheater (22) is fixedly mounted on one side of the top of the low-pressure steam supply header (21).

5. The high pressure steam source replacement system based on the main steam supply period according to claim 1 is characterized in that: The output end of the low-pressure steam supply manifold (21) is provided with a check valve (18), a balancing valve (17) and a seventh valve (16) in sequence, and the output end of the #2 high-pressure steam source tank (14) is provided with a fifth valve (13).

6. The high pressure steam source replacement system based on the main steam supply period according to claim 1 is characterized in that: An end of the cold and hot remixing steam supply pipeline (33) away from the first bypass (4) is connected in parallel with the hot resupply steam pipeline (32) and the cold resupply steam pipeline (31); an end of the hot resupply steam pipeline (32) away from the cold and hot remixing steam supply pipeline (33) is provided with a tenth valve (27), a second regulating valve (28), a fifth reheater (29) and an eleventh valve (30) in sequence.

7. A high pressure steam source replacement system based on main steam supply period according to claim 6, characterized in that: A ninth valve (26), a condenser (25), a first regulating valve (24), and an eighth valve (23) are sequentially provided at one end of the cold re-steam supply pipeline (31) away from the cold and hot re-mixing steam supply pipeline (33).

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