Steam overheating system with backwashing function

Abstract

The steam superheating system comprises a deaerator, a water supply mechanism, a backwashing pipeline, a desuperheater and a superheater, the deaerator is communicated with a water supply pipe of a coal economizer through the water supply mechanism, a stop valve III is arranged on the water supply pipe of the coal economizer, one end of the superheater is communicated with a saturated steam supply pipe, and the other end of the superheater is communicated with a steam supply pipe. One end of the superheater is communicated with a boiler, the other end of the superheater is communicated with a steam heat supply pipe, a desuperheater is arranged on the steam heat supply pipe, and a plurality of drain outlets are formed in the superheater. The operation efficiency and safety of the steam overheating system can be effectively improved, and the alarm rate of non-critical faults is reduced.

Description

[Technical field]

[0001] The utility model relates to a steam superheating system with backwashing, which is suitable for medium and small steam heating boilers. [Background technology]

[0002] In the field of heating, there are strict requirements on the temperature range of superheated steam. The stable operation of the steam superheating system is a key link in the production and operation of industrial boilers. The inner wall of the internal pipe of the superheating system, especially the steam superheater, is prone to accumulate dirt during operation. The long-term accumulation of dirt not only affects the heat exchange efficiency of the superheater, causing the steam temperature to drop and affecting the heating quality, but also blocks the pipeline and affects the safety of the boiler equipment, and even causes accidents. In order to improve the operating efficiency and safety of the superheated steam system and reduce the alarm rate of non-critical faults. This patent proposes a steam superheating system with backwashing. During the interval of boiler maintenance, the online backwashing is turned on, and the steam superheating system can be flushed with high-pressure water to clean the dirt accumulated on the pipe wall, which can effectively improve the operating efficiency and safety of the steam superheating system and reduce the alarm rate of non-critical faults. [Utility Model Content]

[0003] The purpose of the utility model is to solve the problems in the prior art and to propose a steam superheating system with backwashing, which can be turned on for online backwashing during boiler maintenance intervals to perform high-pressure water flushing on the steam superheating system to clean the dirt accumulated on the pipe wall, thereby effectively improving the operating efficiency and safety of the steam superheating system and reducing the alarm rate of non-critical faults.

[0004] To achieve the above-mentioned purpose, the utility model proposes a steam superheating system with backwashing, comprising a deaerator, a water supply mechanism, a backwashing pipeline, a desuperheater and a superheater, wherein the deaerator is connected to the economizer water supply pipe through the water supply mechanism, the economizer water supply pipe is provided with a stop valve III, one end of the superheater is connected to the saturated steam supply pipe, the other end of the superheater is connected to the steam heating pipe, the steam heating pipe is provided with a desuperheater, the superheater is provided with a plurality of sewage outlets, each of the sewage outlets is provided with a stop valve II, the two ends of the backwashing pipeline are respectively connected to the economizer water supply pipe at the input end of the stop valve III and the steam heating pipe at the output end of the desuperheater, and the backwashing pipeline is provided with a stop valve I.

[0005] Preferably, the water supply mechanism comprises two water supply pumps arranged in parallel, and gate valves are provided on the connecting pipes at the input end and the output end of the water supply pump.

[0006] Preferably, a differential pressure transmitter and a sampling tube are provided in sequence on the economizer water supply pipe between the backwash pipe input end and the water supply mechanism, the economizer water supply pipe between the differential pressure transmitter and the sampling tube is connected to the deaerator through a circulation pipe, and a stop valve V is provided on the sampling tube.

[0007] Preferably, a safety valve, a pressure transmitter, a pressure gauge, a temperature transmitter, a thermometer and an electric isolation valve I are provided in sequence on the steam heating pipe at the output end of the desuperheater, and the output end of the backwash pipe is connected to the steam heating pipe at the input end of the electric isolation valve I.

[0008] Preferably, an abnormal steam exhaust port and a shut-off valve VI are provided in sequence on the backwash pipeline at the output end of the shut-off valve I, and an electric isolation valve II is provided on the abnormal steam exhaust port.

[0009] Preferably, the desuperheater is connected to the backwash pipe at the input end of the stop valve I through a desuperheating water supply pipe, and the desuperheating water supply pipe is provided with a stop valve VII and an electric regulating valve in sequence.

[0010] The beneficial effects of the utility model are as follows: the utility model connects the deaerator with the economizer water supply pipe through the water supply mechanism, the economizer water supply pipe is provided with a stop valve III, one end of the superheater is connected with the saturated steam supply pipe, the other end of the superheater is connected with the steam heating pipe, the steam heating pipe is provided with a desuperheater, the superheater is provided with a plurality of sewage outlets, the sewage outlets are all provided with a stop valve II, the two ends of the backwashing pipe are respectively connected with the economizer water supply pipe at the input end of the stop valve III and the steam heating pipe at the output end of the desuperheater, the backwashing pipe is provided with a stop valve I, compared with the prior art, online backwashing can be started during the interval between boiler maintenance, the steam superheating system can be flushed with high-pressure water, the dirt accumulated on the pipe wall can be washed clean, the operation efficiency and safety of the steam superheating system can be effectively improved and the alarm rate of non-critical faults can be reduced.

[0011] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0012] Figure 1 The utility model is a structural schematic diagram of a steam superheating system with backwashing.

[0013] In the figure: 1-deaerator, 2-water supply mechanism, 3-backwash pipeline, 4-desuperheater, 5-superheater, 6-economizer water supply pipe, 7-saturated steam supply pipe, 8-steam heating pipe, 9-stop valve I, 10-drain outlet, 11-stop valve II, 12-stop valve III, 13-differential pressure transmitter, 14-sampling tube, 15-circulation pipeline, 16-stop valve V, 17-safety valve, 18-pressure transmitter, 19-pressure gauge, 21-feedwater pump, 22-connecting pipe, 23-gate valve, 110-temperature transmitter, 111-thermometer, 112-electric isolation valve II, 113-abnormal exhaust port, 114-stop valve VI, 115-desuperheating water supply pipe, 116-stop valve IV, 117-electric regulating valve, 118-electric isolation valve I. [Specific implementation method]

[0014] See also Figure 1 The utility model discloses a steam superheating system with backwashing, comprising a deaerator 1, a water supply mechanism 2, a backwashing pipeline 3, a desuperheater 4 and a superheater 5. The deaerator 1 is connected to an economizer water supply pipe 6 through the water supply mechanism 2. The economizer water supply pipe 6 is provided with a stop valve III12. One end of the superheater 5 is connected to a saturated steam supply pipe 7. The other end of the superheater 5 is connected to a steam heating pipe 8. The steam heating pipe 8 is provided with a desuperheater 4. The superheater 5 is provided with a A plurality of sewage outlets 10 are provided with stop valves II11 on the sewage outlets 10. The two ends of the backwashing pipeline 3 are respectively connected with the economizer water supply pipe 6 at the input end of the stop valve III12 and the steam heating pipe 8 at the output end of the desuperheater 4. The backwashing pipeline 3 is provided with a stop valve I9. The water supply mechanism 2 includes two water supply pumps 21 arranged in parallel. The connecting pipes 22 at the input and output ends of the water supply pump 21 are both provided with gate valves 23. The input end of the backwashing pipeline 3 is connected to the water supply machine 21. The economizer water supply pipe 6 between the structures 2 is provided with a differential pressure transmitter 13 and a sampling pipe 14 in sequence. The economizer water supply pipe 6 between the differential pressure transmitter 13 and the sampling pipe 14 is connected to the deaerator 1 through a circulation pipe 15. The sampling pipe 14 is provided with a stop valve V16. The steam heating pipe 8 at the output end of the desuperheater 4 is provided with a safety valve 17, a pressure transmitter 18, a pressure gauge 19, a temperature transmitter 110, a thermometer 111 and an electric isolation valve I118 in sequence. The backwash pipe The output end of the channel 3 is connected with the steam heating pipe 8 at the input end of the electric isolation valve I118, and the backwash pipe 3 at the output end of the stop valve I9 ​​is ​​provided with an abnormal steam exhaust port 113 and a stop valve VI 114 in sequence, and the abnormal steam exhaust port 113 is provided with an electric isolation valve II 112. The desuperheater 4 is connected with the backwash pipe 3 at the input end of the stop valve I9 ​​through a desuperheating water supply pipe 115, and the desuperheating water supply pipe 115 is provided with a stop valve IV 116 and an electric regulating valve 117 in sequence.

[0015] Working process of this utility model:

[0016] During operation of the steam superheating system with backwashing of the utility model, the stop valve III, the stop valve IV, the electric isolation valve II112 and the electric isolation valve I118 are closed, the corresponding gate valve 23 and the stop valve II11 are opened, and then the corresponding feed water pump 21 is started. The deoxygenated water in the deaerator 1 passes through the corresponding pipe section of the economizer water supply pipe 6, the backwashing pipeline 3, the corresponding pipe section of the steam heating pipe 8, the desuperheater 4 and the superheater 5 under the action of the feed water pump 21, and is finally discharged from the sewage outlet 10.

[0017] No separate water pump is provided for backwashing. Instead, the boiler feed water pump 21 is used to control the opening and closing of backwashing through a stop valve and an electric isolation valve.

[0018] The economizer water supply pipe 6 between the differential pressure transmitter 13 and the sampling pipe 14 is connected to the deaerator 1 through the circulation pipe 15 to ensure the stable pressure of the flushing water;

[0019] The steam heating pipe 8 at the output end of the desuperheater 4 is provided with a safety valve 17, a pressure transmitter 18, a pressure gauge 19, a temperature transmitter 110, and a thermometer 111 in sequence. The temperature and pressure of the steam can be monitored in real time, and the feedback is given to the control system to adjust the desuperheating water flow in real time to ensure that the temperature and pressure of the steam meet the customer's heating needs;

[0020] An abnormal steam exhaust port 113 and a stop valve VI 114 are provided in sequence on the backwash pipe 3 at the output end of the stop valve I9. During the boiler startup phase, when the steam temperature does not meet the standard, the steam is discharged from the abnormal steam exhaust port 113 through the muffler.

[0021] The present application has low manufacturing cost and small floor space, and solves the problems of inconvenience in maintenance, overhaul and hoisting caused by the need to dismantle the existing superheater for maintenance.

[0022] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A steam superheating system with backwashing, characterized in that: The invention comprises a deaerator (1), a water supply mechanism (2), a backwashing pipeline (3), a desuperheater (4) and a superheater (5). The deaerator (1) is connected to an economizer water supply pipe (6) through the water supply mechanism (2). A stop valve III (12) is provided on the economizer water supply pipe (6). One end of the superheater (5) is connected to a saturated steam supply pipe (7). The other end of the superheater (5) is connected to a steam heating pipe (8). A desuperheater (4) is provided on the steam heating pipe (8). The superheater (5) is provided with a plurality of sewage outlets (10). Each of the sewage outlets (10) is provided with a stop valve II (11). The two ends of the backwashing pipeline (3) are respectively connected to the economizer water supply pipe (6) at the input end of the stop valve III (12) and the steam heating pipe (8) at the output end of the desuperheater (4). A stop valve I (9) is provided on the backwashing pipeline (3).

2. A steam superheating system with backwashing as claimed in claim 1, characterized in that: The water supply mechanism (2) comprises two water supply pumps (21) arranged in parallel, and gate valves (23) are provided on the connecting pipes (22) at the input end and the output end of the water supply pump (21).

3. A steam superheating system with backwashing as claimed in claim 1, characterized in that: A differential pressure transmitter (13) and a sampling tube (14) are sequentially arranged on the economizer water supply pipe (6) between the input end of the backwash pipe (3) and the water supply mechanism (2); the economizer water supply pipe (6) between the differential pressure transmitter (13) and the sampling tube (14) is connected to the deaerator (1) via a circulation pipe (15); and a stop valve V (16) is arranged on the sampling tube (14).

4. A steam superheating system with backwashing as claimed in claim 1, characterized in that: A safety valve (17), a pressure transmitter (18), a pressure gauge (19), a temperature transmitter (110), a thermometer (111) and an electric isolation valve I (118) are sequentially arranged on the steam heating pipe (8) at the output end of the desuperheater (4), and the output end of the backwash pipeline (3) is connected to the steam heating pipe (8) at the input end of the electric isolation valve I (118).

5. A steam superheating system with backwashing as claimed in claim 1, characterized in that: An abnormal steam exhaust port (113) and a stop valve VI (114) are sequentially arranged on the backwash pipeline (3) at the output end of the stop valve I (9), and an electric isolation valve II (112) is arranged on the abnormal steam exhaust port (113).

6. A steam superheating system with backwashing according to any one of claims 1 to 5, characterized in that: The desuperheater (4) is connected to the backwash pipe (3) at the input end of the stop valve I (9) through a desuperheating water supply pipe (115), and the desuperheating water supply pipe (115) is provided with a stop valve IV (116) and an electric regulating valve (117) in sequence.

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