High superheat degree adjusting device and method for steam valve test

Abstract

The invention belongs to a steam high-superheat-degree adjusting device and method for a valve test, and particularly relates to a high-superheat-degree adjusting device and method for a steam valve test. The high superheat degree adjusting device for the steam valve test comprises a flue gas bypass pipeline, a filter, an adjusting valve, a condenser, a heater, a cold air conveying pipeline and a steam conveying pipeline. The flue gas temperature is adjusted through heat exchange between the condenser and cold air, and then the superheat degree of a steam medium in a pipeline is improved through heat exchange between the heater and high-temperature flue gas. The device for improving the superheat degree of the steam through the high-temperature flue gas has the remarkable effects that the problems of huge energy consumption, high manufacturing cost and poor adjusting precision existing in the traditional mode that the steam temperature is improved through electric heating are solved, and the device for improving the superheat degree of the steam through the high-temperature flue gas and the accurate control method are provided.

Description

Technical Field

[0001] The present invention belongs to a high superheat adjustment device and adjustment method for steam valve testing, and particularly relates to a high superheat adjustment system and method for steam valve testing. Background Art

[0002] The superheat adjustment device is installed at the outlet of a boiler or steam generator and is used to reheat saturated steam to obtain superheated steam. Its adjustment ability and performance are crucial for the normal operation of downstream equipment. At present, after a boiler or steam heater generates steam, if superheat treatment is required, an electric heating method is usually adopted. After raising the steam temperature, it is transported to downstream steam-using equipment through pipelines. However, arranging an electric heater outside the steam pipeline occupies a large space, and its superheat degree is relatively low. Especially in the working conditions where there are certain flow requirements for steam and a high superheat degree is required, a particularly high-power electric heater needs to be configured, and corresponding power infrastructure such as distribution boxes and cables has high requirements and consumes a huge amount of electricity. Therefore, those skilled in the art urgently need to provide a steam superheat adjustment device with a compact structure, energy conservation and environmental protection, and rapidity. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a high superheat adjustment device and adjustment method for steam valve testing.

[0004] The present invention is implemented as follows: A high superheat adjustment device for steam valve testing, which includes a heater, a condenser, a cold air delivery pipeline, a steam delivery pipeline, and a data acquisition and control unit. The steam delivery pipeline delivers steam to the heater, the output end of the heater is connected to the condenser, the output end of the condenser is connected to a filter, the cold air delivery pipeline is wound around the condenser, the cold air delivery pipeline is connected to a compressed air source, and a third regulating valve and a fourth regulating valve are respectively arranged on both sides of the condenser on the cold air delivery pipeline.

[0005] The condenser of the high superheat adjustment device for steam valve testing as described above includes a condenser housing, a flue gas inlet flange, a flue gas outlet flange, a condenser cover plate, and a cold air delivery pipeline. The relatively low-temperature air delivered by the cold air delivery pipeline exchanges heat with the flue gas in the condenser housing, thereby realizing the function of adjusting the flue gas temperature.

[0006] The cold air delivery pipeline of the high superheat adjustment device for steam valve testing as described above includes a pipe section from the compressed air source to the fourth regulating valve, and the compressed air source, the third regulating valve, the cold air delivery pipeline, and the fourth regulating valve are arranged in sequence along the cold air flow direction.

[0007] A high superheat adjustment device for steam valve testing as described above, wherein the heater includes a heater housing, a flue gas inlet flange, a flue gas outlet flange, a heater cover plate, and a steam delivery pipeline. The steam delivered by the steam delivery pipeline exchanges heat with the high-temperature flue gas in the heater housing 20, thereby realizing the function of adjusting the high superheat of the steam.

[0008] A high superheat adjustment device for steam valve testing as described above, wherein the steam delivery pipeline includes a pipe section from the steam delivery pipeline to the heater outlet arranged in sequence along the steam delivery direction. A pressure sensor for detecting the steam pressure and a second temperature thermocouple for detecting the steam temperature are installed on the heater outlet pipe section.

[0009] A high superheat adjustment device for steam valve testing as described above, wherein a first regulating valve is provided on the condenser, a second regulating valve is provided on the heater, and a first temperature sensor is provided at the output end of the heater.

[0010] A high superheat adjustment device for steam valve testing as described above, wherein the data acquisition and control unit is connected to the signal output ends of the pressure sensor, the first temperature sensor, and the second temperature sensor, and the output end of the data acquisition and control unit is connected to the input ends of the first regulating valve, the second regulating valve, the third regulating valve, and the fourth regulating valve.

[0011] A high superheat adjustment method for steam valve testing includes the following steps:

[0012] Step 1: Turn on the data acquisition and control unit and collect the data of the pressure sensor, the first temperature sensor, and the second temperature sensor in real time.

[0013] Step 2: Partially open the first regulating valve and the second regulating valve with an opening degree of 50%. The flue gas passes through the flue gas bypass pipeline, the filter, the first regulating valve, the flue gas inlet flange, the condenser housing, the flue gas outlet flange, the flue gas inlet flange, the heater housing, the flue gas outlet flange, the second regulating valve, and the flue gas discharge pipe and then is discharged into the air. After running for a period of time, start to adjust after the data of the first temperature sensor and the second temperature sensor are stable.

[0014] Step 3: The data acquisition and control unit inputs the temperature control target value. When the target value is lower than the actual measured value of the second temperature sensor, the data acquisition and control unit outputs a control signal to increase the opening degrees of the first regulating valve and the second regulating valve, thereby increasing the flue gas flow rate passing through the heater. Through heat exchange, the steam temperature in the steam delivery pipeline is increased until the actual measured value of the second temperature sensor reaches within ±10% of the temperature control target value input by the data acquisition and control unit, realizing the function of automatically adjusting the steam temperature at the heater outlet to a maximum of 720°C and the superheat up to 350°C through the data acquisition and control unit.

[0015] Step 4: The data acquisition and control unit inputs the temperature control target value. When the target value is higher than the actual measurement value of the second temperature sensor, the data acquisition and control unit outputs a control signal to open and increase the opening degrees of the third regulating valve and the fourth regulating valve. The cold air flows from the compressed air source, passes through the third regulating valve, the cold air delivery pipeline, and the fourth regulating valve and then is discharged. By increasing the opening degrees of the third regulating valve and the fourth regulating valve, the cold air flow rate passing through the cold air delivery pipeline is increased. Through heat exchange, the flue gas temperature flowing through the condenser housing can be reduced, that is, the flue gas temperature in the heater housing is reduced, thereby reducing the steam temperature in the steam delivery pipeline until the actual measurement value of the second temperature sensor reaches within ±10% of the temperature control target value input by the data acquisition and control unit.

[0016] Step 5: Repeat the above Steps 1 to 4 to automatically adjust the steam temperature and superheat degree at the heater outlet.

[0017] The remarkable effect of the present invention is that in the past, for electric heaters, when the superheat degree was relatively high and a certain steam flow rate was required, high-power power supply facilities needed to be configured, which were costly, consumed a large amount of energy, and also occupied a relatively large area. The high superheat degree adjustment device solves this problem. By using the flue gas generated by the boiler or steam generator itself as the heat source, without additional energy consumption, and by adjusting the flue gas flow rate and inlet temperature, the steam superheat degree can be accurately adjusted, and the reliability is greatly improved. Description of the Drawings

[0018] Figure 1 Schematic diagram of a high superheat degree adjustment device for steam valve testing.

[0019] Figure 2 Schematic diagram of the condenser.

[0020] Figure 3 Schematic diagram of the heater.

[0021] In the figure: 1. Flue gas bypass pipeline, 2. Filter, 3. First regulating valve, 4. Condenser, 5. Cold air delivery pipeline, 6. Third regulating valve, 7. Compressed air source, 8. Fourth regulating valve, 9. Steam delivery pipeline, 10. Heater, 11. Second regulating valve, 12. First thermocouple, 13. Pressure sensor, 14. Second temperature sensor, 15. Data acquisition and control unit, 16. Main flue gas channel, 17. Flue gas discharge pipe, 20. Condenser housing, 21. Flue gas inlet flange, 22. Flue gas outlet flange, 23. Condenser cover plate, 24. Cold air delivery pipeline, 30. Heater housing, 31. Flue gas inlet flange, 32. Flue gas outlet flange, 33. Heater cover plate, 34. Steam delivery pipeline. Detailed Embodiments

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] A high superheat adjustment device and adjustment method for steam valve testing, as Figure 1 shown, 1. Flue gas bypass pipeline, 2. Filter, 3. First regulating valve, 4. Condenser, 5. Cold air delivery pipeline, 6. Third regulating valve, 7. Compressed air source, 8. Fourth regulating valve, 9. Steam delivery pipeline, 10. Heater, 11. Second regulating valve, 12. First temperature thermocouple, 13. Pressure sensor, 14. Second temperature thermocouple, 15. Data acquisition and control unit, 16. Main flue gas passage, 17. Flue gas evacuation pipe.

[0024] The high superheat adjustment device and adjustment method for steam valve testing described above, wherein it includes a flue gas bypass pipeline 1, a filter 2, a first regulating valve 3, a condenser 4, a heater 10, a second regulating valve 11, a cold air delivery pipeline 5, a third regulating valve 6, a compressed air source 7, a fourth regulating valve 8, and a steam delivery pipeline 9. A first temperature thermocouple 12 is provided at the outlet of the condenser 4, and a pressure sensor 13 is provided at the outlet of the heater 10.

[0025] As described above, the flue gas bypass pipeline 1 includes an inclined upward pipe section between the Y-shaped interface of the main flue gas passage 16 and the bypass pipeline 1 and the second regulating valve 3. The inclined upward pipe section includes a filter 2, a condenser 4, a heater 10, a second regulating valve 11, and a flue gas evacuation pipe section 17 arranged in sequence along the flue gas flow direction.

[0026] As described above, the condenser 4 is as Figure 2 shown, and it includes a condenser housing 20, a flue gas inlet flange 21, a flue gas outlet flange 22, a condenser cover plate 23, and a cold air delivery pipeline 24. The relatively low-temperature air transported by the cold air delivery pipeline 24 exchanges heat with the flue gas in the condenser housing 20, thereby realizing the function of adjusting the flue gas temperature.

[0027] As described above, the cold air delivery pipeline 5 includes a pipe section from the compressed air source 7 to the fourth regulating valve 8, and a compressed air source 7, a third regulating valve 6, a cold air delivery pipeline 24, and a fourth regulating valve 8 arranged in sequence along the cold air flow direction.

[0028] As described above, the heater 10 is as Figure 3 shown, and it includes a heater housing 30, a flue gas inlet flange 31, a flue gas outlet flange 32, a heater cover plate 33, and a steam delivery pipeline 34. The steam transported by the steam delivery pipeline 34 exchanges heat with the high-temperature flue gas in the heater housing 20, thereby realizing the function of adjusting the high superheat of the steam.

[0029] As described above, the steam delivery pipeline 9 includes a pipe section from the steam delivery pipeline 34 to the outlet of the heater 10 arranged in sequence along the steam delivery direction. A pressure sensor 13 for detecting the steam pressure and a third temperature thermocouple 14 for detecting the steam temperature are installed on the pipe section at the outlet of the heater 10.

[0030] As described above, the regulating device further includes a data acquisition and control program unit 15. The signal receiving end of the data acquisition unit is connected to the signal output ends of the pressure sensor 13, the first temperature sensor 12, and the second temperature sensor 14. The output end of the acquisition and control program unit 15 is connected to the input ends of the first regulating valve 3, the second regulating valve 11, the third regulating valve 6, and the fourth regulating valve 8. The data acquisition and control program unit 15 controls the opening degrees of the sixth regulating valve and the eighth regulating valve by collecting and analyzing the data of the first temperature thermocouple 12 to adjust the temperature and flow rate of the flue gas entering the heater 10. The data acquisition and control program unit 15 controls the opening degrees of the first regulating valve 3 and the second regulating valve 11 by collecting and analyzing the temperature of the second thermocouple 14 to adjust the flow rate of the flue gas flowing into the heater 10, thereby achieving the function of heating the steam temperature in the steam delivery pipeline 9.

[0031] The method for regulating high superheat is as follows:

[0032] Step 1: Turn on the data acquisition and control program unit 15, and collect the data of the pressure sensor 13, the first temperature sensor 12, and the second temperature sensor 14 in real time;

[0033] Step 2: Partially open the first regulating valve 3 and the second regulating valve 11 with an opening degree of 50%. The flue gas passes through the flue gas bypass pipeline 1, the filter 2, the first regulating valve 3, the flue gas inlet flange 21, the condenser housing 20, the flue gas outlet flange 22, the flue gas inlet flange 31, the heater housing 30, the flue gas outlet flange 32, the second regulating valve 11, and the flue gas discharge pipe 17 and then is discharged. After running for a period of time, start to adjust after the data of the first temperature sensor 12 and the second temperature sensor 14 are stable;

[0034] Step 3: The data acquisition and control unit 15 inputs the temperature control target value. When the target value is lower than the actual measured value of the second thermocouple 14, the data acquisition and control unit 15 outputs a control signal to increase the opening degrees of the first regulating valve 3 and the second regulating valve 11, thereby increasing the flue gas flow rate passing through the heater 10. Through heat exchange, the steam temperature in the steam delivery pipeline 34 is increased until the actual measured value of the second thermocouple 14 reaches within ±10% of the temperature control target value input by the data acquisition and control unit 15. Realize the function of automatically adjusting the steam temperature at the outlet of the heater 10 to a maximum of 720 °C by the data acquisition and control unit 15, with a superheat degree of up to 350 °C.

[0035] Step 4: The data acquisition and control unit 15 inputs the temperature control target value. When the target value is higher than the actual measurement value of the second thermocouple 14, the data acquisition and control unit 15 outputs a control signal to open and increase the opening degrees of the third regulating valve 6 and the fourth regulating valve 8. The cold air flows from the compressed air source 7, through the third regulating valve 6, the cold air delivery pipeline 24, and the fourth regulating valve 8 and then is discharged. By increasing the opening degrees of the third regulating valve 6 and the fourth regulating valve 8, the cold air flow rate through the cold air delivery pipeline 24 is increased. Through heat exchange, the flue gas temperature flowing through the condenser housing 20 can be reduced, that is, the flue gas temperature in the heater housing 30 is reduced, thereby reducing the steam temperature in the steam delivery pipeline 34 until the actual measurement value of the second thermocouple 14 reaches within ±10% of the temperature control target value input by the data acquisition and control unit 15.

[0036] Step 5: Repeat the above Steps 1 to 4 to automatically regulate the steam temperature and superheat degree at the outlet of the heater 10.

Claims

1. A high superheat degree adjusting device for steam valve testing, characterized in that: It includes a heater (10), a condenser (4), a cold air delivery pipeline (5), a steam delivery pipeline (9), and a data acquisition and control unit (15). The steam delivery pipeline (9) delivers steam to the heater (10). The output end of the heater (10) is connected to the condenser (4). The output end of the condenser (4) is connected to a filter (2). The cold air delivery pipeline (5) is wound around the condenser (4). The cold air delivery pipeline (5) is connected to a compressed air source (7), and a third regulating valve (6) and a fourth regulating valve (8) are respectively arranged on both sides of the condenser (4) on the cold air delivery pipeline (5).

2. The high superheat degree adjusting device for steam valve test according to claim 1, characterized in that: The condenser (4) includes a condenser housing (20), a flue gas inlet flange (21), a flue gas outlet flange (22), a condenser cover plate (23), and a cold air delivery pipeline (24). The cold air delivered by the cold air delivery pipeline (24) exchanges heat with the flue gas in the condenser housing (20), thereby realizing the function of adjusting the flue gas temperature.

3. The high superheat adjustment device for steam valve testing according to claim 2, characterized in that: The cold air delivery pipeline (5) includes the pipe section from the compressed air source (7) to the fourth regulating valve (8), and the compressed air source (7), the third regulating valve (6), the cold air delivery pipeline (24), and the fourth regulating valve (8) arranged in sequence along the cold air flow direction.

4. The high superheat degree adjusting device for steam valve test according to claim 3, wherein: The heater (10) includes a heater housing (30), a flue gas inlet flange (31), a flue gas outlet flange (32), a heater cover plate (33), and a steam delivery pipeline (34). The steam delivered by the steam delivery pipeline (34) exchanges heat with the high-temperature flue gas in the heater housing 20, thereby realizing the function of adjusting the high superheat degree of the steam.

5. The high superheat degree adjusting device for steam valve test according to claim 4, characterized in that: The steam delivery pipeline (9) includes the pipe section from the steam delivery pipeline (34) to the outlet of the heater (10) arranged in sequence along the steam delivery direction. A pressure sensor (13) for detecting the steam pressure and a second temperature thermocouple (14) for detecting the steam temperature are installed on the outlet pipe section of the heater (10).

6. The high superheat degree adjusting device for steam valve test according to claim 5, characterized in that: A first regulating valve (3) is arranged on the condenser (4), a second regulating valve (11) is arranged on the heater (10), and a first temperature sensor (12) is arranged at the output end of the heater (10).

7. The high superheat degree adjusting device for steam valve test according to claim 6, characterized in that: The data acquisition and control unit (15) is connected to the signal output ends of the pressure sensor (13), the first temperature sensor (12), and the second temperature sensor (14). The output end of the data acquisition and control unit (15) is connected to the input ends of the first regulating valve (3), the second regulating valve (11), the third regulating valve (6), and the fourth regulating valve (8).

8. A high superheat degree adjustment method for steam valve testing, characterized in that, It includes the following steps: Step 1: Turn on the data acquisition and control unit (15) and collect the data of the pressure sensor (13), the first temperature sensor (12), and the second temperature sensor (14) in real time; Step 2: Partially open the first regulating valve (3) and the second regulating valve (11) with an opening degree of 50%. The flue gas passes through the flue gas bypass pipeline (1), filter (2), first regulating valve (3), flue gas inlet flange (21), condenser housing (20), flue gas outlet flange (22), flue gas inlet flange (31), heater housing (30), flue gas outlet flange (32), second regulating valve (11), and flue gas discharge pipe (17) and then discharges to the atmosphere. Operate for a period of time until the data of the first temperature sensor (12) and the second temperature sensor (14) are stable and then start the regulation. Step 3: The data acquisition and control unit (15) inputs the temperature control target value. When the target value is lower than the actual measured value of the second temperature sensor (14), the data acquisition and control unit (15) outputs a control signal to increase the opening degrees of the first regulating valve (3) and the second regulating valve (11), thereby increasing the flue gas flow rate passing through the heater (10). Through heat exchange, the steam temperature in the steam delivery pipeline (34) is increased until the actual measured value of the second temperature sensor (14) reaches within ±10% of the temperature control target value input by the data acquisition and control unit (15), realizing the function of automatically regulating the outlet steam temperature of the heater (10) to a maximum of 720 °C and the superheat degree up to 350 °C through the data acquisition and control unit (15). Step 4: The data acquisition and control unit (15) inputs the temperature control target value. When the target value is higher than the actual measured value of the second temperature sensor (14), the data acquisition and control unit (15) outputs a control signal to open and increase the opening degrees of the third regulating valve (6) and the fourth regulating valve (8). The cold air flows from the compressed air source (7), passes through the third regulating valve (6), cold air delivery pipeline (24), and fourth regulating valve (8) and then discharges to the atmosphere. By increasing the opening degrees of the third regulating valve (6) and the fourth regulating valve (8), the cold air flow rate passing through the cold air delivery pipeline (24) is increased. Through heat exchange, the flue gas temperature passing through the condenser housing (20) can be reduced, that is, the flue gas temperature in the heater housing (30) is reduced, thereby reducing the steam temperature in the steam delivery pipeline (34) until the actual measured value of the second temperature sensor (14) reaches within ±10% of the temperature control target value input by the data acquisition and control unit (15). Step 5: Repeat the above Steps 1 to 4 to automatically regulate the outlet steam temperature and superheat degree of the heater (10).

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