Boiler heat supply steam extraction reheating system
By transforming the heating surface of the boiler reheater into the heating surface of the steam extraction reheater, and using flue gas to heat the steam extraction, combined with control valve and bypass pipeline adjustment, the safety and efficiency of the boiler heating surface is solved, and the use of steam is realized The satisfaction of parameters and the reduction of high-quality steam usage have improved the adaptability and efficiency of boiler steam supply.
Patent Information
- Application Number
- CN202420302658.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-19
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-19
AI Technical Summary
In generator sets, the prior art is difficult to meet the steam parameter requirements and safety at the heating surfaces of all levels of the boiler, and reduce the efficiency of the unit when high-quality steam is used.
Design a boiler heating and steam pumping reheating system. By transforming the heating surface of some boiler reheaters into a heating surface of the steam pumping reheater, using boiler flue gas to heat the steam pumping, the steam temperature is increased, and the control valve and The bypass pipeline adjusts the steam flow rate and temperature to meet the parameter requirements under steam supply and non-steam supply conditions.
It realizes that the steam usage parameters are met under the steam extraction conditions, and reduces the amount of high-quality steam in the non-piping conditions, improves the adaptability and safety of boiler steam supply, avoids dry burning, and improves the unit efficiency. .
Smart Images
Figure CN222143002U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of boilers, in particular to a boiler heat supply steam extraction reheating system. Background Art
[0002] In the generator set, according to the steam demand for industry or heating around the power plant, in conventional steam extraction, the steam extraction points that meet the parameters are set according to the steam usage parameters. However, with the development of the steam market, there is a problem that the steam extraction points set on either the steam turbine side or the boiler side cannot fully match the steam usage parameters. For example, the steam usage parameters require 4.6MPa.a and 540℃, but only a matching point with a pressure of 4.6MPa.a can be found, but the temperature parameters can only reach about 400℃.
[0003] In order to meet the requirements of steam parameters, the conventional design is to change the extraction point to a higher temperature parameter or mix steam with a higher temperature parameter to meet the steam supply temperature requirements. This method has the following shortcomings: when supplying or not supplying steam, it affects the safety of the heating surfaces of the boiler at all levels; at the same time, using high-quality steam parameters reduces the efficiency of the unit. Utility Model Content
[0004] In order to overcome the deficiencies of the prior art, the utility model provides a boiler heat extraction steam reheating system to solve the problems existing in the prior art such as low safety of heating surfaces of various levels of the boiler when steam is supplied or not supplied.
[0005] The technical solution adopted by the utility model to solve the above problems is:
[0006] A boiler heating extraction steam reheating system comprises an extraction steam pipeline, an extraction steam reheater heating surface, and a steam supply pipeline which are connected in sequence, and also comprises a reheat steam inlet pipeline, a boiler reheater heating surface, and a reheat steam outlet pipeline which are connected in sequence.
[0007] As a preferred technical solution, it also includes a first bypass pipeline whose two ends are respectively connected to the extraction steam pipeline and the reheat steam inlet pipeline.
[0008] As a preferred technical solution, it also includes a first control valve arranged on the first bypass pipeline.
[0009] As a preferred technical solution, it also includes a second bypass pipeline with two ends respectively connected to the steam supply pipeline and the reheat steam outlet pipeline.
[0010] As a preferred technical solution, it also includes a second control valve arranged on the second bypass pipeline.
[0011] As a preferred technical solution, it also includes a third control valve arranged on the steam extraction pipeline.
[0012] As a preferred technical solution, it also includes a fourth control valve arranged on the steam supply pipeline.
[0013] As a preferred technical solution, it also includes a fifth control valve arranged on the reheat steam inlet pipeline.
[0014] As a preferred technical solution, it also includes a first cooling water system arranged on the steam extraction pipeline.
[0015] As a preferred technical solution, it also includes a second cooling water system arranged on the steam extraction pipeline.
[0016] Compared with the prior art, the utility model has the following beneficial effects:
[0017] (1) The structure is simple and reliable, which can not only ensure the steam parameter requirements of heat users under steam extraction conditions, but also ensure the switching of steam extraction points under non-steam extraction conditions to reduce the consumption of high-quality steam;
[0018] (2) The utility model divides the original reheater heating surface, transforms part of the tube screen into the extraction steam reheater heating surface, and uses the boiler flue gas to heat the extraction steam so that the steam temperature meets the steam supply requirements. After the transformation, the extraction steam temperature can be increased to 540°C, and can meet the use of steam supply conditions and non-steam supply conditions at the same time, which can greatly improve the adaptability of the boiler steam supply. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of the utility model;
[0020] Figure 2 The utility model is a schematic diagram of the principle of using the utility model to carry out heat supply extraction steam reheating.
[0021] Marks and their corresponding names in the attached drawings: 1. extraction steam pipeline, 2. extraction steam reheater heating surface, 3. steam supply pipeline, 4. reheat steam inlet pipeline, 5. boiler reheater heating surface, 6. reheat steam outlet pipeline, 7. first bypass pipeline, 8. second bypass pipeline, 9. first control valve, 10. second control valve, 11. third control valve, 12. fourth control valve, 13. fifth control valve, 14. first cooling water system, 15. second cooling water system. DETAILED DESCRIPTION
[0022] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.
[0023] Example 1
[0024] like Figure 1 to Figure 2As shown, in order to meet the requirements of steam usage parameters and reduce the consumption of high-quality steam, the utility model proposes a switchable heat extraction steam reheating system, which has a simple and reliable structure and can not only ensure the steam usage parameter requirements of heat users under extraction conditions, but also ensure the switching of extraction points under non-extraction conditions to reduce the consumption of high-quality steam.
[0025] The utility model proposes a heating extraction steam reheating system, which can meet the use of steam supply conditions and non-steam supply conditions at the same time, and can greatly improve the adaptability of boiler steam supply. The specific technical solution is: the heating extraction steam reheating system (see Figure 1 ) mainly includes an extraction steam pipeline 1, an extraction steam reheater heating surface 2, a steam supply pipeline 3, a reheat steam inlet pipeline 4, a boiler reheater heating surface 5, a reheat steam outlet pipeline 6, a first bypass pipeline 7, a second bypass pipeline 8, a first control valve 9, a second control valve 10, a third control valve 11, a fourth control valve 12, a fifth control valve 13, a first cooling water system 14, and a second cooling water system 15.
[0026] The utility model provides a heating extraction steam reheating system, the system comprises transforming part of the tube panels of the original reheater heating surface in the boiler flue into an extraction steam reheater heating surface 2, the extraction steam reheater heating surface 2 is respectively connected to the extraction point interface and the steam supply interface through an extraction steam pipeline 1 and a steam supply pipeline 3. The boiler reheater heating surface 5 is respectively connected through a reheat steam inlet pipeline 4 and a reheat steam outlet pipeline 6.
[0027] The system further comprises a first bypass pipe 7 arranged at the reheat steam inlet, the bypass pipe 7 is connected to the steam extraction pipe, and a first control valve 9 is arranged on the bypass pipe 7 .
[0028] The system further comprises a second bypass pipe 8 arranged in the steam supply pipe, wherein the bypass pipe 8 is connected to the reheat steam outlet pipe 6 , and a second control valve 10 is arranged on the bypass pipe 8 .
[0029] The system further comprises a third control valve 11 arranged on the steam extraction pipeline 1 , a fourth control valve 12 arranged on the steam supply pipeline 3 , and a fifth control valve 13 arranged on the reheat steam inlet pipeline 4 .
[0030] The system also includes a first cooling water system 14 and a second cooling water system 15 added to the heating steam pipeline, which can flexibly adjust the steam temperature according to the needs of heat users and can greatly improve the adaptability of boiler steam supply.
[0031] The utility model utilizes the original boiler reheater for segmentation and transforms part of the tube screen into the heating surface of the extraction steam reheater. It can meet the heating demand of special parameters without adding a new heating surface.
[0032] The utility model can ensure that the heating surface of the extraction steam reheater can be switched freely under the steam supply condition or the non-steam supply condition, and there is no dry burning, and the heating surface of the boiler can operate safely.
[0033] The utility model can flexibly adjust the steam flow and temperature of the reheater system and the reheater system through the bypass pipeline, the control valve group, and the desuperheating water system, and can greatly improve the adaptability of the boiler steam supply.
[0034] Example 2
[0035] like Figure 1 to Figure 2 As shown, as a further optimization of Example 1, based on Example 1, this embodiment also includes the following technical features:
[0036] The purpose of the utility model is mainly to solve the problem of low temperature at the steam extraction point (cannot meet the steam supply temperature requirement), to ensure that the heating surface 2 of the steam extraction reheater does not dry burn under the steam supply condition or the non-steam supply condition, and the boiler heating surface can operate safely. Among them, the steam supply condition in the utility model is the condition where steam extraction + steam supply are carried out simultaneously, and also includes the condition where steam is not extracted + steam is supplied; the non-steam supply condition includes both the condition where steam is extracted + no steam is supplied, and also includes the condition where steam is not extracted + no steam is supplied.
[0037] One of the schemes of the heating extraction steam reheating system of the utility model is that the steam supply working condition is the working condition of extraction and steam supply at the same time. The extraction steam from the appropriate extraction point interface exchanges heat with the hot flue gas in the boiler flue in the extraction steam reheater heating surface 2, and is sent to the downstream through the steam supply pipeline 3 after meeting the steam parameter requirements. At this time, the first control valve 9 is in the closed state, the third control valve 11 and the fifth control valve 13 are in the open state, and the second control valve 10 and the fourth control valve 12 adjust the steam supply flow.
[0038] The second scheme of the heating extraction steam reheating system of the utility model is that under the condition of no extraction + steam supply, the high-pressure cylinder exhaust steam from the reheat steam inlet 4 is adjusted by the first control valve 9 and the fifth control valve 13 to enter the extraction steam reheater heating surface 2, and is sent to the extraction steam reheater heating surface 2 to exchange heat with the hot flue gas in the boiler flue, and then is sent to the downstream through the steam supply pipeline 3 after meeting the steam parameter requirements. Under this condition, the third control valve 11 is in the off state, the first control valve 9 and the fifth control valve 13 adjust the steam flow entering the extraction steam reheater heating surface 2, and the second control valve 10 and the fourth control valve 12 adjust the steam supply flow.
[0039] The third scheme of the heating extraction steam reheating system of the utility model is the extraction steam + no steam supply working condition, under which the extraction steam from the extraction point interface exchanges heat with the hot flue gas in the boiler flue in the extraction steam reheater heating surface 2, and then mixes with the boiler outlet reheat steam through the second bypass pipe 8. Under this working condition, the first control valve 9 and the fourth control valve 12 are in the closed state, and the second control valve 10, the third control valve 11 and the fifth control valve 13 are in the open state.
[0040] The fourth scheme of the heating extraction steam reheating system of the utility model is that under the condition of no extraction + no steam supply, the high-pressure cylinder exhaust steam from the reheat steam inlet 4 is adjusted by the first control valve 9 and the fifth control valve 13 to enter the extraction steam reheater heating surface 2, and is sent to the extraction steam reheater heating surface 2 to exchange heat with the hot flue gas in the boiler flue, and then mixed with the boiler outlet reheat steam through the second bypass pipe 8. Under this condition, the third control valve 11 and the fourth control valve 12 are in the closed state, the first control valve 9 and the fifth control valve 13 adjust the steam flow entering the extraction steam reheater heating surface 2, and the second control valve 10 is in the open state.
[0041] The utility model provides a heating extraction steam reheating system, which further comprises a first cooling water system 14 and a second cooling water system 15 added to the heating steam pipeline, which can flexibly adjust the steam temperature according to the needs of heat users and can greatly improve the adaptability of boiler steam supply.
[0042] As described above, the utility model can be implemented well.
[0043] The above is only a preferred embodiment of the utility model and does not limit the utility model in any form. According to the technical essence of the utility model, within the spirit and principles of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the utility model.
Claims
1. A boiler heating extraction steam reheating system, It is characterized in that It comprises a steam extraction pipeline (1), a steam extraction reheater heating surface (2), and a steam supply pipeline (3) which are connected in sequence, and also comprises a reheat steam inlet pipeline (4), a boiler reheater heating surface (5), and a reheat steam outlet pipeline (6) which are connected in sequence.
2. A boiler heating extraction steam reheating system according to claim 1, It is characterized in that It also includes a first bypass pipeline (7) whose two ends are respectively connected to the steam extraction pipeline (1) and the reheat steam inlet pipeline (4).
3. A boiler heating extraction steam reheating system according to claim 2, It is characterized in that It also includes a first control valve (9) arranged on the first bypass pipeline (7).
4. A boiler heating extraction steam reheating system according to claim 1, It is characterized in that It also includes a second bypass pipeline (8) whose two ends are respectively connected to the steam supply pipeline (3) and the reheat steam outlet pipeline (6).
5. A boiler heating extraction steam reheating system according to claim 4, It is characterized in that It also includes a second control valve (10) arranged on the second bypass pipeline (8).
6. A boiler heating extraction steam reheating system according to claim 1, It is characterized in that It also includes a third control valve (11) arranged on the steam extraction pipeline (1).
7. A boiler heating extraction steam reheating system according to claim 1, It is characterized in that It also includes a fourth control valve (12) arranged on the steam supply pipeline (3).
8. A boiler heating extraction steam reheating system according to claim 1, It is characterized in that It also includes a fifth control valve (13) arranged on the reheat steam inlet pipeline (4).
9. The boiler heating extraction steam reheating system according to claim 1, It is characterized in that It also includes a first desuperheating water system (14) arranged on the steam extraction pipeline (1).
10. A boiler heating extraction steam reheating system according to any one of claims 1 to 9, It is characterized in that It also includes a second desuperheating water system (15) arranged on the steam extraction pipeline (1).