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Method for obtaining maximum working fluid temperature of water ring vacuum pump

A technology of water ring vacuum pump and working fluid, which is applied in the direction of pumps, rotary piston pumps, complex mathematical operations, etc., can solve the problem of lack of obtaining the maximum working fluid temperature of water ring vacuum pumps, and achieve the effect of automatic monitoring and control

Active Publication Date: 2022-02-01
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a method for obtaining the maximum working fluid temperature of the water ring vacuum pump, so as to solve the lack of obtaining the maximum working fluid temperature of the water ring vacuum pump in the prior art

Method used

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  • Method for obtaining maximum working fluid temperature of water ring vacuum pump
  • Method for obtaining maximum working fluid temperature of water ring vacuum pump
  • Method for obtaining maximum working fluid temperature of water ring vacuum pump

Examples

Experimental program
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Effect test

Embodiment 1

[0107] Step 1: If the thermal power unit is running at 300MW load, the measured value of the circulating water inlet temperature is 20°C, check figure 2 It can be seen that the expected value of the condenser pressure is 5.339kPa;

[0108] Step 2: Calculate the actual ITD value, subtract the measured value of the circulating water inlet temperature from the saturation temperature corresponding to the condenser pressure of 5.339kPa to 20°C, ITD=14.07°C;

[0109] Step 3: The condenser pressure is 5.339kPa, the actual ITD is 14.07℃, check image 3 It can be seen that the amount of non-condensable gas should reach a value of 92.22kg / h; Curve 3 is the curve when the amount of leaked dry air is a fixed value. If it is inconsistent with the actual value, multiply it by the corresponding proportional coefficient according to formula (3).

[0110] Step 4: The suction pressure is approximately equal to the condenser pressure of 5.339kPa, and the amount of non-condensable gas should re...

Embodiment 2

[0114] Step 1: If the thermal power unit is running at 300MW load, the measured value of the circulating water inlet temperature is 20°C, check figure 2 It can be seen that the expected value of the condenser pressure is 5.339kPa;

[0115] Step 2: Calculate the actual ITD value, subtract the measured value of the circulating water inlet temperature from the saturation temperature corresponding to the condenser pressure of 5.339kPa to 20°C, and the actual ITD=14.07°C;

[0116] Step 3: The condenser pressure is 5.339kPa, the actual ITD is 14.07℃, check image 3 It can be seen that the amount of non-condensable gas should reach 92.22kg / h; if the actual amount of non-condensable gas on site is 1.5 times the expected value, that is, 138.33kg / h.

[0117] Step 4: The suction pressure is approximately equal to the condenser pressure of 5.339kPa, and the amount of non-condensable gas should reach 138.33kg / h. Check Figure 4 It can be seen that the theoretical ITD value is 15.54°C; ...

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Abstract

The invention discloses a method for obtaining the maximum working fluid temperature of a water ring vacuum pump. The method specifically comprises the steps that three sets of characteristic curves of cold end equipment are established, wherein the curve 1 is a condenser thermal performance curve, the curve 2 is a change curve of the steam extraction capacity under different condenser pressures, and the curve 3 is a vacuum pump steam extraction performance curve. The steam condenser pressure value corresponding to the unit load is found out through the curve 1, the steam extraction capacity value needed by the vacuum pump corresponding to the steam condenser pressure is found out through the curve 2, the steam extraction pressure and the steam extraction capacity corresponding to the steam condenser ITD value are found out through the curve 3, and the maximum working fluid temperature of the water ring vacuum pump is calculated. According to the method, the three groups of characteristic curves of the cold end equipment are established, and the existing measuring points on site are combined, so that the operation practice can be correctly guided. According to the method, monitoring software related to the cold end system can also be embedded, and automatic monitoring control of the cold end system is achieved.

Description

technical field [0001] The invention belongs to the technical field of energy saving and consumption reduction of coal-fired units, and in particular relates to a method for obtaining the highest working fluid temperature of a water ring vacuum pump. Background technique [0002] The condenser is the equipment used by thermal power units to establish vacuum. Since the absolute tightness of the vacuum system cannot be guaranteed, it is necessary to set up a vacuum system to continuously extract the non-condensable gas leaked into the condenser to maintain the vacuum of the condenser. At present, the common supporting equipment in the vacuum system of thermal power units is a water ring vacuum pump. In order to ensure the effective extraction of non-condensable gases, two conditions must be met: [0003] Condition 1: The pumped non-condensable gas has a certain degree of subcooling [0004] Most of the exhaust steam from the steam turbine is condensed in the main condensation...

Claims

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Application Information

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IPC IPC(8): F04C25/02F04C19/00F04C28/28G06F17/11
CPCF04C25/02F04C19/00F04C28/28G06F17/11
Inventor 邹洋马汀山居文平韩立万超贾明晓李高潮荆涛王明勇
Owner XIAN THERMAL POWER RES INST CO LTD