Unit heat supply steam extraction flow measurement method based on enthalpy value calculation
A technology of extraction steam flow and measurement method, which is applied in the field of unit heating extraction flow measurement based on enthalpy calculation, and can solve the problems of large measurement deviation, deviation of drainage flow of heating network, high failure rate, etc.
Inactive Publication Date: 2020-11-06
TIANJIN GUONENG JINNENG BINHAI THERMAL POWER CO LTD
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Problems solved by technology
[0004] The above-mentioned existing technical solutions have the following defects: during use, due to the coexistence of internal vapor and liquid states, large measurement deviations, and high failure rates, various problems may occur during use of the ultrasonic flowmeter, making the final measurement results inaccurate. , the deviation of the hydrophobic flow rate of the heating network measured by the ultrasonic flowmeter can even exceed 100 tons
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[0035] Embodiment: A method for measuring the heating and extraction steam flow rate of a unit based on enthalpy calculation, such as figure 1 with figure 2 As shown, the specific steps are as follows:
[0036] The first step is to collect the water supply temperature of the heating network, the water supply pressure of the heating network, the return water temperature of the heating network and the return water pressure of the heating network.
[0037] The second step is to calculate the enthalpy value of the heating network supply water according to the heating network water supply temperature and the heating network water supply pressure, and calculate the heating network return water enthalpy value based on the heating network return water temperature and the heating network return water pressure. Input the water supply temperature, water supply pressure and atmospheric pressure of the heating network into the enthalpy algorithm of water to generate the water supply enth...
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The invention discloses a unit heat supply steam extraction flow measurement method based on enthalpy value calculation, and belongs to the technical field of a heat supply unit. The method comprisesthe following steps: a first step, acquiring heat supply network supply water temperature, heat supply network supply water pressure, heat supply network return water temperature and heat supply network return water pressure; a second step, calculating a heat supply network supply water enthalpy value and a heat supply network return water enthalpy value; a third step, acquiring sum of temperaturedifference of a unit heater, sum of quality judgement of temperature measuring points of an inlet and an outlet of the heater, heat supply network supply water flow and heat supply network return water flow; a fourth step, calculating a unit quantity of heat estimated value; a fifth step, acquiring heat supply network steam extraction temperature, heat supply network steam extraction pressure andheat supply network heater lyophobic water temperature; a sixth step, calculating enthalpy drop of changing into lyophobic water from steam; a seventh step, calculating quantity of heat released by steam while changing into lyophobic water; and an eighth step, calculating heat supply network lyophobic water flow and heat supply network steam extraction flow. The method provided by the invention has an effect of accurately calculating heat supply network lyophobic water flow and heat supply stem extraction flow.
Description
technical field [0001] The invention relates to the technical field of heating units, in particular to a method for measuring the heating and extraction steam flow of the unit based on enthalpy calculation. Background technique [0002] At present, the heating extraction flow reflects the heating capacity of the unit, and provides a reliable reference for the unit load capacity in the winter heating period. Therefore, companies that use industrial units must calculate the heating and extraction flow. Flow meters are usually used for flow detection, and now the more common flow meters are ultrasonic flow meters. [0003] The existing technology can refer to the Chinese invention patent with the authorized announcement number CN105909322A, which discloses an online monitoring method for the heat consumption rate of an extraction and condensing steam turbine unit. The real-time operation data of the steam turbine unit; the real-time data acquisition network recodes and isolate...
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IPC IPC(8): F24D19/10
CPCF24D19/1048
Inventor 卢刚方久文左亮杰孟继洲刘赫男屠强高宝生张明琨张凌灿任胜利王肖禹
Owner TIANJIN GUONENG JINNENG BINHAI THERMAL POWER CO LTD