CN110318879B - Moisture and frost prevention device of gas turbine air inlet filter element and control method thereof - Google Patents
Moisture and frost prevention device of gas turbine air inlet filter element and control method thereof Download PDFInfo
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- CN110318879B CN110318879B CN201910748070.8A CN201910748070A CN110318879B CN 110318879 B CN110318879 B CN 110318879B CN 201910748070 A CN201910748070 A CN 201910748070A CN 110318879 B CN110318879 B CN 110318879B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000002265 prevention Effects 0.000 title claims abstract description 21
- 230000001105 regulatory effect Effects 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 230000001276 controlling effect Effects 0.000 claims description 16
- 230000003247 decreasing effect Effects 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000000446 fuel Substances 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/047—Heating to prevent icing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/05—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
- F02C7/055—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with intake grids, screens or guards
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/057—Control or regulation
Abstract
The invention discloses a moisture and frost prevention device of an air inlet filter element of a gas turbine and a control method thereof, wherein the moisture and frost prevention device comprises a connecting pipe, an air outlet pipe, a heating nozzle, an electric stop valve, a flow regulating valve, a temperature and humidity sensor, an air inlet filter element, an external controller, a miniature weather station and an air inlet filter; the miniature weather station detects the temperature and the relative humidity of the dry ball, selects to enter a moisture proof or frost proof mode according to the numerical values of the temperature and the relative humidity of the dry ball, continuously detects the temperature and the relative humidity by using a temperature and humidity sensor in the air inlet filter, feeds back temperature and relative humidity signals to an external controller, automatically controls a flow regulating valve by using the external controller, realizes real-time temperature regulation, and realizes respective moisture proof and frost proof effects.
Description
Technical Field
The invention relates to a moisture and frost prevention device of an air inlet filter element of a gas turbine and a control method thereof.
Background
The gas turbine takes clean air as a working medium, so that an air inlet of the gas turbine is not only provided with an air purifying device commonly called an air filter, but also has the operation pressure difference as low as possible, and the phenomena of wet blockage and frost blockage of an air inlet filter element cannot occur at any time. However, in wet weather, the phenomenon of wet blockage or frost blockage of the filter element of the air filter often occurs, which is particularly serious in northern or wet areas, once the filter element is subjected to the phenomenon of wet blockage or frost blockage, the output of the fuel engine can be rapidly reduced, the fuel consumption can be increased along with the phenomenon, and if the fuel engine is not treated in time, the fuel engine can automatically alarm and stop. Otherwise, once the engine enters a surge condition, a significant accident can occur in which the engine is damaged. How to avoid wet blockage and frost blockage of an air inlet filter element of a combustion engine is not completely unified in theory and method at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the problems that: the moisture and frost preventing device for the gas turbine air inlet filter element can effectively avoid the phenomena of moisture blockage and frost blockage of the gas turbine air inlet filter element and a control method thereof.
In order to solve the problems, the invention adopts the following technical scheme:
a moisture and frost prevention device of an air inlet filter element of a gas turbine comprises a connecting pipe, an air outlet pipe, a heating nozzle, an electric stop valve, a flow regulating valve, a temperature and humidity sensor, an air inlet filter element, an external controller, a miniature weather station and an air inlet filter; one end of the connecting pipe is communicated with the air outlet pipe; one side of the air outlet pipe is uniformly communicated with a plurality of heating nozzles; an air inlet filter element is arranged on the other side of the air outlet pipe; the air inlet filter element is arranged in the air inlet filter; the temperature and humidity sensor is arranged in the air inlet filter; an electric stop valve and a flow regulating valve are respectively arranged on the connecting pipe; the miniature weather station is used for monitoring the dry bulb temperature and the relative humidity of the external atmosphere; the external controller is respectively connected with the electric stop valve, the flow regulating valve and the temperature and humidity sensor in a control mode.
Further, the manual stop valve is also included; the manual stop valve is arranged on the connecting pipe.
Further, a pressure sensor is included; the pressure sensor is arranged on the connecting pipe.
Further, the other end of the connecting pipe is communicated and butted with an air extraction interface of the gas turbine.
Further, a temperature sensor is also included; the temperature sensor is arranged on the connecting pipe.
Further, the air injection point of the heating nozzle is arranged between 20 mm and 25mm outside the air inlet filter element.
A control method of a moisture and frost prevention device of an air inlet filter element of a gas turbine comprises the following steps:
s1, detecting the temperature and the relative humidity of a dry ball by a miniature weather station, and selecting to enter a damp-proof or frost-proof mode according to the values of the temperature and the relative humidity of the dry ball;
s2, when the miniature weather station detects the dry bulb temperature T 1 Is at a temperature of 4.5 ℃ less than or equal to T 1 At a temperature of less than or equal to 35 ℃ and relative humidity phi 1 Is positioned at phi 1 When the temperature is more than or equal to 90% -98%, entering a moisture-proof mode, and starting an external controller to control the electric cuttingThe stop valve is automatically opened, the external controller simultaneously controls the flow regulating valve to be opened according to a preset opening rate, at the moment, the high-temperature hot air flow passes through the connecting pipe and the air outlet pipe and then gradually heats the air at the air inlet at the outer side of the air inlet filter element by using the heating nozzle, and the relative humidity phi is increased after the air inlet temperature is increased 1 Slowly decreasing, the temperature and humidity sensor in the air inlet filter continuously detects the temperature and the relative humidity and feeds back the temperature and the relative humidity signals to the external controller, and when the external controller receives phi 1 Equal to a preset relative humidity phi 2 When the external controller detects the relative humidity phi, the external controller controls the flow regulating valve to be slowly closed, and once the flow regulating valve is slowly closed, the temperature of air at the air inlet at the outer side of the air inlet filter element can be gradually reduced at the moment 1 Achieve phi 1 ＞Ф 2 When the air inlet filter element is opened, the flow regulating valve is controlled to be opened slowly by the external controller again according to the preset opening speed, the high-temperature hot air flow is gradually heated to the air in front of the air inlet filter element through the heating nozzle again, and the relative humidity phi is increased after the air inlet temperature is increased 1 Slowly decreasing again, and controlling reciprocally so that the relative humidity phi 1 Always at a preset relative humidity phi 2 Loitering left and right, thus playing the role of moisture prevention;
when the miniature weather station detects that the temperature of the dry ball is less than or equal to-40 ℃ and less than or equal to T 2 At a temperature of less than or equal to 4.5 ℃ and a relative humidity phi 3 Is positioned at phi 3 When the temperature is more than or equal to 85% -90%, entering a frostproof mode, controlling an electric stop valve to be automatically opened by an external controller, controlling a flow regulating valve to be slowly opened according to a preset opening rate by the external controller at the same time, gradually heating inlet air at an inlet at the outer side of an inlet filter element by high-temperature hot air flow through a heating nozzle, and controlling the temperature T of the inlet air 3 Relative humidity after elevation phi 3 Slowly decreasing, the temperature and humidity sensor in the air inlet filter continuously detects the temperature and the relative humidity and feeds back the temperature and relative humidity signals to the external controller until the external controller receives T 3 -T 2 When the temperature is 4-5 ℃, the external controller controls the flow regulating valve to be closed, and once the flow regulating valve is slowly closed, the air inlet temperature T 3 Is of the temperature of (1)The degree is gradually reduced and the relative humidity phi 3 With a slow increase, when the external controller receives T 3 -T 2 When the signal of (4-5) DEG C is transmitted, the flow regulating valve is slowly opened again according to the preset opening speed, and the high-temperature hot air flow gradually heats the air in front of the air inlet filter element through the heating nozzle again, so that T is formed 3 -T 2 Again of the value T 3 -T 2 When the temperature is 4-5 ℃, the flow regulating valve is closed, and the flow regulating valve is reciprocally controlled so that the air inlet temperature T 3 Dry bulb temperature T 2 The difference value of the two is always within the range of 4-5 ℃, so that the anti-frost purpose is achieved.
Further, Φ in the step S2 2 The range of values of (2) is 68 to 72%.
Further, in the step S2, when the atmospheric temperature T 1 Is at a temperature of 4.5 ℃ less than or equal to T 1 At a temperature of less than or equal to 35 ℃ and relative humidity phi 1 Is positioned at phi 1 And when the temperature is more than or equal to 95%, entering a moisture-proof mode.
Further, in the step S2, when the atmospheric temperature is less than or equal to minus 40 ℃ and less than or equal to T 2 At a temperature of less than or equal to 4.5 ℃ and a relative humidity phi 3 Is positioned at phi 3 And when the temperature is more than or equal to 88 percent, entering an anti-frost mode.
The beneficial effects of the invention are that
1. According to the invention, the air outlet pipe is arranged at the air inlet at the outer side of the air inlet filter element, the plurality of heating nozzles are uniformly arranged at the outer side of the air outlet pipe, and the air input into the air inlet at the outer side of the air inlet filter element is heated through the plurality of heating nozzles, so that the wet blockage and frost blockage phenomena of the invention are greatly reduced; the invention utilizes the other end of the connecting pipe to be communicated and butted with the air extraction interface of the gas turbine, so that the air extraction and heating of the gas turbine compressor are realized, the design structure is ingenious, the heating is timely, the heat source is easy to obtain, and the control is convenient.
2. The invention uses the atmospheric temperature T 1 Is at a temperature of 4.5 ℃ less than or equal to T 1 At a temperature of less than or equal to 35 ℃ and relative humidity phi 1 Is positioned at phi 1 Entering a moisture-proof mode when the temperature is more than or equal to 90-98%, and keeping the atmospheric temperature at minus 40 ℃ to less than or equal to T 2 At a temperature of less than or equal to 4.5 ℃ and a relative humidity phi 3 Is positioned at phi 3 When the temperature is more than or equal to 85-90%, entering into an anti-frost mode, and when the respective conditions are met, utilizing a plurality ofThe heating nozzle gradually heats the air at the air inlet at the outer side of the air inlet filter element, and continuously detects the temperature and the relative humidity by utilizing a temperature and humidity sensor in the air inlet filter and feeds back the temperature and relative humidity signals to an external controller, and the external controller is utilized to automatically control the flow regulating valve, so that the real-time regulation of the temperature is realized, and the respective effects of moisture prevention and frost prevention are realized.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the moisture and frost prevention device of the gas turbine air inlet filter element comprises a connecting pipe 2, an air outlet pipe 8, a heating nozzle 9, an electric stop valve 5, a flow regulating valve 6, a temperature and humidity sensor 11, an air inlet filter element 10, an external controller, a miniature weather station 1 and an air inlet filter 12; one end of the connecting pipe 2 is communicated and connected with the air outlet pipe 8; one side of the air outlet pipe 8 is uniformly communicated with a plurality of heating nozzles 9; an air inlet filter element 10 is arranged on the other side of the air outlet pipe 8; the air inlet filter element 10 is arranged in the air inlet filter 12; the temperature and humidity sensor 11 is arranged in the air inlet filter 12; an electric stop valve 5 and a flow regulating valve 6 are respectively arranged on the connecting pipe 2; the miniature weather station 1 is used for monitoring the dry bulb temperature and the relative humidity of the external atmosphere; the external controller is respectively connected with the electric stop valve 5, the flow regulating valve 6 and the temperature and humidity sensor 11 in a control mode. Further, a manual stop valve 3 is also included; the manual stop valve 3 is arranged on the connecting pipe 2. Further, a pressure sensor 4 is included; the pressure sensor 4 is arranged on the connecting pipe 2. Further, the other end of the connecting pipe 2 is communicated and butted with an air extraction interface of the gas turbine. The heating power of the gas inlet heating of the gas turbine is generally large, and some of the heating power is higher than thousands KW, so that the heating power is not easily obtained by a gas turbine station factory; the air inlet heating of the combustion engine, particularly the air inlet frost prevention heating, is controlled fully automatically in proper time and in proper quantity, is heated by other methods, has long lag time and poor effect, and sometimes causes moisture prevention and frost prevention failure; the air compressors of the general gas turbine are provided with one or a plurality of air compressor air exhaust interfaces for users to use as instrument wind, oil tank pressurization and air intake heating, and a heat source is easy to obtain; the gas turbine compressor is heated by gas extraction, the newly added system and equipment are relatively simple and easy to realize full-automatic control, the quantity of the heated gas extraction accounts for 1.2-1.5% of the gas turbine air inflow, the power loss is less than 3%, and the quantity of the heated gas extraction accounts for less than 4% in the allowable range of gas turbine manufacturers and users. Further, the air injection point of the heating nozzle is arranged between 20 mm and 25mm outside the air inlet filter element. Further, a temperature sensor 7 is also included; the temperature sensor 7 is arranged on the connecting pipe.
The embodiment of the invention relates to a control method of a moisture and frost prevention device of an air inlet filter element of a gas turbine.
A control method of a moisture and frost prevention device of an air inlet filter element of a gas turbine comprises the following steps:
s1, detecting the temperature and the relative humidity of a dry ball by the miniature weather station 1, and selecting to enter a damp-proof or frost-proof mode according to the values of the temperature and the relative humidity of the dry ball.
S2, when the miniature weather station 1 detects the dry bulb temperature T 1 Is at a temperature of 4.5 ℃ less than or equal to T 1 At a temperature of less than or equal to 35 ℃ and relative humidity phi 1 Is positioned at phi 1 When the humidity is more than or equal to 90-98%, entering a moisture-proof mode, and taking precedence when phi is 1 Entering a moisture-proof mode when the humidity is more than or equal to 95%; the external controller is started to control the electric stop valve 5 to be automatically opened, the external controller simultaneously controls the flow regulating valve 6 to be opened according to a preset opening rate, and at the moment, the high-temperature hot air flow passes through the connecting pipe 2 and the air outlet pipe 8 and then gradually heats the air at the air inlet at the outer side of the air inlet filter element 10 by using the heating nozzle 9, and the relative humidity phi is increased after the air inlet temperature is increased 1 Then slowly decreasing, at this time, the temperature and humidity sensor 11 in the air intake filter 12 continuously detects the temperature and the relative humidity and feeds back the temperature and the relative humidity signals to the external controller, when the external controller receives the phi 1 Equal to a preset relative humidity phi 2 When phi is 2 The value of (2) ranges from 68 to 72%, and may preferably be phi 2 The external controller controls the flow regulating valve 6 to be slowly closed, and once the flow regulating valve 6 is slowly closed, the air at the air inlet outside the air inlet filter elementThe temperature of (2) is gradually lowered when the external controller detects the relative humidity phi 1 Achieve phi 1 ＞Ф 2 When the air inlet filter element 10 is opened, the flow regulating valve 6 is controlled to be opened slowly by the external controller again according to the preset opening speed, the air in front of the air inlet filter element 10 is heated gradually by the high-temperature hot air flow through the heating nozzle 9 again, and the relative humidity phi is increased after the air inlet temperature is increased 1 Slowly decreasing again, and controlling reciprocally so that the relative humidity phi 1 Always at a preset relative humidity phi 2 The patient wanders left and right, so that the aim of preventing dampness is fulfilled.
When the miniature weather station detects that the temperature of the dry ball is less than or equal to-40 ℃ and less than or equal to T 2 At a temperature of less than or equal to 4.5 ℃ and a relative humidity phi 3 Is positioned at phi 3 When the relative humidity is more than or equal to 85-90%, entering into an anti-frost mode, and preferably when the relative humidity phi is higher than or equal to 3 Is positioned at phi 3 When the content is more than or equal to 88%, entering an anti-frost mode; the external controller controls the electric stop valve to automatically open, then the external controller simultaneously controls the flow regulating valve to slowly open according to a preset opening rate, and at the moment, high-temperature hot air flows gradually heat the inlet air of the air inlet at the outer side of the inlet filter element through the heating nozzle, and the temperature T of the inlet air 3 Relative humidity after elevation phi 3 Slowly decreasing, the temperature and humidity sensor in the air inlet filter continuously detects the temperature and the relative humidity and feeds back the temperature and relative humidity signals to the external controller until the external controller receives T 3 -T 2 When the temperature is 4-5 ℃, the external controller controls the flow regulating valve to be closed, and once the flow regulating valve is slowly closed, the air inlet temperature T 3 Will gradually decrease in temperature and relative humidity phi 3 With a slow increase, when the external controller receives T 3 -T 2 When the signal of (4-5) DEG C is transmitted, the flow regulating valve is slowly opened again according to the preset opening speed, and the high-temperature hot air flow gradually heats the air in front of the air inlet filter element through the heating nozzle again, so that T is formed 3 -T 2 Again of the value T 3 -T 2 When the temperature is 4-5 ℃, the flow regulating valve is closed, and the flow regulating valve is reciprocally controlled so that the air inlet temperature T 3 Dry bulb temperature T 2 The difference value of the two is always within the range of 4-5 ℃, so that the anti-frost purpose is achieved.
The following conditions were carried out separately at one standard atmospheric pressure and the corresponding wet and frost plugging conditions were shown in tables 1 and 2 below.
| Dry bulb temperature (DEG C) | 4.5 | 4.5 | 10 | 18 | 20 | 35 | 38 |
| Relative humidity (%) | 88 | 90 | 93 | 95 | 97 | 98 | 95 |
| Filter element plug (wet plug or frost plug) | No wet or frost blockage | Slight wet blocking | General wet plug | Serious wet blockage | General wet plug | Slight wet blocking | No wet or frost blockage |
TABLE 1
| Dry bulb temperature (DEG C) | -44 | -40 | -25 | -2 | 3.5 | 4.5 | 5 |
| Relative humidity (%) | 88 | 85 | 88 | 95 | 92 | 95 | 93 |
| Filter element plug (wet plug or frost plug) | No wet or frost blockage | Slight frost plug | Serious frost plug | Serious frost plug | General frost plug | Slight frost plug | Slight wet blocking |
TABLE 2
Studies have shown that: at-40 ℃ greater than T 2 Or T 1 At the temperature of more than 35 ℃, the air inlet filter element can not be wet blocked or frost blocked.
Through strict theoretical calculation and a large number of on-site experiments, the root cause of wet blockage and frost blockage of the air inlet filter element is considered, not the filter element intercepts rainwater or ice and snow in the air, but the air inlet filter element has air inlet pressure drop of 600-1200 Pa during operation, and condensed water is separated out due to air inlet temperature drop caused by the 'throttling and cooling' effect of air inlet pressure drop, so that wet blockage or frost blockage is formed; the wet frost plug is also not that rainwater wets the filter material to cause the filter material to swell when meeting the expansion, but that condensed water causes the dust accumulation in the filter element to swell when meeting the water or the condensed water to form frost.
From engineering thermodynamic theory, it can be calculated that the pressure drop generated during air flow will necessarily result in air temperature drop; when the relative humidity of the air is relatively high, the tiny temperature drop is enough to lead the dry bulb temperature Ta of the dry air to be lower than the dew point temperature Ts of the dry air, and the water vapor in the dry air can be naturally separated out in the form of condensed water; when the temperature is higher than 0 ℃, the condensed water wets the dust accumulation such as sulfate in the filter element, and the dust accumulation swells when meeting water, so that a so-called wet plug is formed; when the air temperature is lower than 0 ℃, condensed water can instantaneously sublimate into frost, and so-called frost plug is formed. The only way to avoid the wet blockage or frost blockage of the air inlet filter element is to properly heat the air inlet before the air inlet filter element.
Dew point temperature of dry air and local atmospheric pressure P 0 Dry bulb temperature Ta, relative humidity phi 1 There is a one-to-one functional relationship. For example, local atmospheric pressure P 0 101.325 kPa, dry bulb temperature Ta of 20 ℃ and relative humidity phi 1 At 97% dew point temperature T of dry air s Is 19.51 ℃. Ta-T s When the temperature is reduced by 0.49 ℃, condensed water is separated out from the air, and the condensed water continuously gathers to wet salt deposition ash such as sulfate in the filter element, so that wet blockage of the air inlet filter element can be caused. However, the relative humidity in haze or heavy fog weather is generally up to 100%, so that the wet blockage of the fuel engine is frequent. Any so-called waterproof filter element made of filter media that attempts to find waterproof is futile.
Also for example, local atmospheric pressure P 0 93KPa, dry bulb temperature Ta of-2 ℃ and relative humidity phi 1 At 95%, the dew point temperature of the dry air is-2.69 ℃, ta-T S The temperature drop of 0.69 ℃ causes condensed water to be separated out from the air, and the condensed water is sublimated into frost immediately because the temperature is lower than the freezing point temperature, so that the frost blockage of the filter element is caused.
Wet or frost plugs formed by condensed water are not possible to eliminate fundamentally by any mechanical means. Because the sludge or frost that it forms is trapped inside the filter element. The only effective method is to heat the intake air of the combustion engine in proper time and in proper quantity.
As still the above example, if the intake air of 20℃is heated to 4℃to 24℃at this time the relative humidity of the dry air. Phi 1 From 97% to phi 2 76%, and the dew point temperature of the dry air is 19.51 ℃, ta-ts=4.49 ℃, and condensed water is not generated due to the original temperature drop of 0.49 ℃; also, if T is a Intake air heating of = -2 ℃ 4 ℃ up to T 1 Relative humidity of dry air at 2 =2℃ 2 Reduced to 71.05%, the dew point temperature is still-2.69 ℃, ta-T s No condensed water is generated even when the temperature is reduced to 0.69 ℃ and no frost blockage is generated.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A control method of a moisture and frost prevention device of an air inlet filter element of a gas turbine comprises a connecting pipe, an air outlet pipe, a heating nozzle, an electric stop valve, a flow control valve, a temperature and humidity sensor, an air inlet filter element, an external controller, a miniature weather station and an air inlet filter; one end of the connecting pipe is communicated with the air outlet pipe; one side of the air outlet pipe is uniformly communicated with a plurality of heating nozzles; an air inlet filter element is arranged on the other side of the air outlet pipe; the air inlet filter element is arranged in the air inlet filter; the temperature and humidity sensor is arranged in the air inlet filter; an electric stop valve and a flow regulating valve are respectively arranged on the connecting pipe; the miniature weather station is used for monitoring the dry bulb temperature and the relative humidity of the external atmosphere; the external controller is respectively connected with the electric stop valve, the flow regulating valve and the temperature and humidity sensor in a control way; the method is characterized by comprising the following steps of:
s1, detecting the temperature and the relative humidity of a dry ball by a miniature weather station, and selecting to enter a damp-proof or frost-proof mode according to the values of the temperature and the relative humidity of the dry ball;
s2, when the miniature weather station detects the dry bulb temperature T 1 Is at a temperature of 4.5 ℃ less than or equal to T 1 At a temperature of less than or equal to 35 ℃ and relative humidity phi 1 Is positioned at phi 1 When the temperature is more than or equal to 90%, entering a moisture-proof mode, starting an external controller to control an electric stop valve to be automatically opened, simultaneously controlling a flow regulating valve to be opened according to a preset opening rate by the external controller, gradually heating air at an air inlet at the outer side of an air inlet filter element by using a heating nozzle after the high-temperature hot air passes through a connecting pipe and an air outlet pipe, and increasing the relative humidity phi after the air inlet temperature is increased 1 Slowly decreasing, the temperature and humidity sensor in the air inlet filter continuously detects the temperature and the relative humidity and feeds back the temperature and the relative humidity signals to the external controller, and when the external controller receives phi 1 Equal to a preset relative humidity phi 2 When the flow regulating valve is closed slowly, the external controller controls the flow regulating valve to be closed slowly, and once the flow is regulatedAfter the throttle valve is slowly closed, the temperature of the air at the air inlet at the outer side of the air inlet filter element is gradually reduced, and when the external controller detects the relative humidity phi 1 Achieve phi 1 ＞Ф 2 When the air inlet filter element is opened, the flow regulating valve is controlled to be opened slowly by the external controller again according to the preset opening speed, the high-temperature hot air flow is gradually heated to the air in front of the air inlet filter element through the heating nozzle again, and the relative humidity phi is increased after the air inlet temperature is increased 1 Slowly decreasing again, and controlling reciprocally so that the relative humidity phi 1 Always at a preset relative humidity phi 2 Loitering left and right, thus playing the role of moisture prevention;
when the miniature weather station detects that the temperature of the dry ball is less than or equal to-40 ℃ and less than or equal to T 2 At a temperature of less than or equal to 4.5 ℃ and a relative humidity phi 3 Is positioned at phi 3 When the temperature is more than or equal to 85%, entering an anti-frost mode, controlling an electric stop valve to be automatically opened by an external controller, controlling a flow regulating valve to be slowly opened according to a preset opening rate by the external controller at the same time, gradually heating inlet air at an air inlet at the outer side of an inlet filter element by high-temperature hot air flow through a heating nozzle, and controlling the temperature T of the inlet air 3 Relative humidity after elevation phi 3 Slowly decreasing, the temperature and humidity sensor in the air inlet filter continuously detects the temperature and the relative humidity and feeds back the temperature and relative humidity signals to the external controller until the external controller receives T 3 -T 2 When the temperature is 4-5 ℃, the external controller controls the flow regulating valve to be closed, and once the flow regulating valve is slowly closed, the air inlet temperature T 3 Will gradually decrease in temperature and relative humidity phi 3 With a slow increase, when the external controller receives T 3 -T 2 When the signal of the temperature is less than 5 ℃, the flow regulating valve is slowly opened again according to the preset opening speed, and the high-temperature hot air flow gradually heats the air in front of the air inlet filter element through the heating nozzle again, so that T is formed 3 -T 2 Again of the value T 3 -T 2 When the temperature is between 4 and 5 ℃, the flow regulating valve is closed, and the flow regulating valve is reciprocally controlled so that the inlet air temperature T 3 Dry bulb temperature T 2 The difference value of (2) is always in the range of 4-5 ℃, thus playing the role of frost prevention.
2. The method for controlling a moisture and frost protection apparatus for a gas turbine inlet filter cartridge of claim 1, further comprising a manual shut-off valve; the manual stop valve is arranged on the connecting pipe.
3. The method for controlling a moisture and frost protection apparatus for a gas turbine inlet filter cartridge of claim 1, further comprising a pressure sensor; the pressure sensor is arranged on the connecting pipe.
4. The control method of the moisture and frost prevention device of the gas turbine inlet filter element according to claim 1, wherein the other end of the connecting pipe is communicated and butted with the air extraction interface of the gas turbine.
5. The method for controlling a moisture and frost protection apparatus for a gas turbine inlet filter element of claim 1, further comprising a temperature sensor; the temperature sensor is arranged on the connecting pipe.
6. The method for controlling a moisture and frost protection apparatus for an air intake filter of a gas turbine according to claim 1, wherein the air injection point of the heating nozzle is installed between 20 mm and 25mm outside the air intake filter.
7. The method for controlling a moisture and frost preventing apparatus for a gas turbine inlet filter element according to claim 1, wherein Φ in step S2 2 The range of values of (2) is 68 to 72%.
8. The method for controlling a moisture and frost preventing apparatus for an air intake filter of a gas turbine according to claim 1, wherein in said step S2, the dry bulb temperature T is 1 Is at a temperature of 4.5 ℃ less than or equal to T 1 At a temperature of less than or equal to 35 ℃ and relative humidity phi 1 Is positioned at phi 1 And when the temperature is more than or equal to 95%, entering a moisture-proof mode.
9. According to claimThe control method of the moisture and frost prevention device of the gas turbine inlet filter element of claim 1, characterized in that in the step S2, when the dry bulb temperature is less than or equal to-40 ℃ and less than or equal to T 2 At a temperature of less than or equal to 4.5 ℃ and a relative humidity phi 3 Is positioned at phi 3 And when the temperature is more than or equal to 88 percent, entering an anti-frost mode.
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| CN114111399A (en) * | 2021-11-09 | 2022-03-01 | 珠海格力电器股份有限公司 | Heat exchange equipment and anti-frosting method thereof |
| CN114856817A (en) * | 2022-04-25 | 2022-08-05 | 江苏风行动力科技有限公司 | Compressor bleed heating's gas turbine filter core anti-icing damp proof device that admits air |
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