Condensing steam turbine rear cylinder cooling system

[0014] refer to figure 1 , a cooling system for the rear cylinder of a condensing steam turbine, the cooling system includes a vacuum pumping device 4, a condenser 3 and a condensate water pump 5, the condenser 3 is connected to the condensate water pump 5 through a pipeline, and the condensate water pump 5 is connected to the condensate water pump 5 through the pipeline and the tee respectively. The spraying device 9 is connected to the condensed jelly main pipe, the first check valve 6, the first stop valve 7 and the regulating valve 8 are installed on the pipeline of the condensed water pump 5 and the spraying device 9, and the pipeline of the condensed water pump 5 and the condensed jelly mother pipe is installed There is a second check valve 10 and a second stop valve 11; the condenser 3 is connected to the vacuum device 4 through a pipeline, and a temperature measuring element 2 is provided on the line between the condenser 3 and the rear cylinder 1 of the condensing steam turbine; The spray device 9 atomizes the condensed water into the rear cylinder 1 of the condensing steam turbine; the regulating valve 8 is a manual valve or an electric valve. The cooling system can lead a channel of condensate water from the outlet of the condensate pump 5 without using the external water spray desuperheating system, pass through the check valve 6, the stop valve 7, the regulating valve 8 and the spray device 9, and enter the condensate. The rear cylinder 1 of the steam turbine is cooled, and at the same time, by controlling the cooling water flow of the vacuum pumping device 4 and the condenser 3, the vacuum degree of the condenser 3 is controlled, and the temperature of the condensed water is adjusted, so as to realize the control of the rear cylinder 1 of the condensing steam turbine. of cooling.

[0015] according to figure 1 As shown in the system diagram, the construction of the cylinder cooling system after the completion of the condensing steam turbine. Before the condensing steam turbine is running, first open the stop valve 11, close the stop valve 7 and the regulating valve 8, then open the condensate pump 5 and the vacuum device 4, and start the system operation; when the temperature measuring element 2 shows that the rear cylinder of the condensing steam turbine When the temperature of 1 is high, open the stop valve 7, control the opening of the regulating valve 8, and cool the cylinder 1 after the condensing steam turbine; flow, so as to control the vacuum degree of the condenser 3, and then the temperature of the condensed water can be adjusted;

[0016] When the condensing steam turbine stops running, first close the stop valve 7 and the regulating valve 8, and then close the condensate pump 5, the vacuuming device 4 and the stop valve 11.