CN211454379U - Steam Turbine Condenser Hot Well Liquid Level Control System - Google Patents

Abstract

The utility model discloses a liquid level control system for a condenser hot well for a steam turbine, which comprises a liquid level transmitter, a controller, a three-way regulating valve and a condensate pump. An input end of the controller is electrically connected with the liquid level transmitter, The output end of the controller is electrically connected with the three-way regulating valve, and the liquid level transmitter is connected with the hot well. The liquid level transmitter is used to detect the liquid level change of the hot well and transmit the detected liquid level rising or falling signal to the controller. The inlet of the three-way regulating valve is communicated with the outlet of the condensate pump, the first outlet of the three-way regulating valve is communicated with the external drainage system, and the second outlet of the three-way regulating valve is communicated with the hot well. The steam turbine condenser hot well liquid level control system can achieve the purpose of adjusting the hot well liquid level by controlling the outlet opening of the three-way regulating valve, so as to keep the hot well liquid level stable and avoid abnormal hot well liquid levels. The setup saves a regulator valve, thereby reducing costs.

Description

Steam Turbine Condenser Hot Well Liquid Level Control System

technical field

The utility model relates to the technical field of condensers, in particular to a liquid level control system for a condenser hot well for a steam turbine.

Background technique

Steam turbine is a rotating power equipment that uses the internal energy of steam to do work through turbine-stage expansion to drive generators, pumps, fans and compressors. It is widely used in power plants, steel, petrochemical and other fields. The condenser is one of the important auxiliary machines of the steam turbine unit. The exhausted steam of the condensing steam turbine is condensed into water after passing through the condenser, and stored in the hot well of the condenser, and then the condensed water is sent to the low-pressure heater or remover by the condensate pump. Oxygenator and other subsequent process equipment.

The condenser is mainly composed of shell, tube sheet, tube bundle, intermediate tube sheet and other components. The tube sheet divides the condenser shell into the steam condensation area and the circulating cooling water inlet and outlet water chambers; the intermediate tube sheet is used for the support and positioning of the tube bundle. There is also a hot well at the lower part of the condenser. The function of the hot well is to collect the main condensate generated by the continuous condensation of a large amount of exhausted steam, and to provide a certain static head for the condensate pump. If the liquid level of the hot well is too low or too high, the safe and economical operation of the steam turbine will be affected. The efficiency of the steam turbine is reduced, and the subcooling degree of the condensate water will increase, and the oxygen dissolved in the condensate water will increase, which will lead to the corrosion of the pipeline valve and the heater between the condenser and the deaerator, and the condensate water will be supercooled. The increase of the heat taken will reduce the economic efficiency of the steam turbine; when the liquid level of the hot well is too low, the condensate pump will be cavitated, which will further cause the liquid level of the deaerator to be low. water supply. Therefore, it is necessary to design the condenser hot well liquid level adjustment device.

At present, the adjustment of the liquid level of the condenser hot well is realized by controlling the flow rate of the condensate main pipe and the recirculation pipe. Specifically, as shown in Fig. 1, an electric or pneumatic regulating valve is installed in the condensate main pipe 2 and the recirculation pipe 5, and a condensate pump 3 is arranged on the condensate main pipe 2. The inlet of the recirculation pipe 5 is located between the condensate pump 3 and the condensate water pipe 3. Between the condensate main control valve 4, when the condenser 1 is under the initial load or cold condition, close the condensate main control valve 4, and keep the liquid level of the hot well 11 by controlling the opening of the recirculation pipe control valve 5 in the given range. When the liquid level of the hot well 11 is higher than the given value, open the condensate main control valve 4 and gradually close the recirculation pipe control valve 6, so that the liquid level of the hot well is lowered and maintained within the given range; When the liquid level is lower than the given value, open the recirculation pipe regulating valve 6, and at the same time gradually close the condensate main regulating valve 4, so that the liquid level of the hot well is gradually increased.

However, since the above-mentioned regulating system needs to use two regulating valves, the pipeline of the regulating system is complicated and the cost is high.

Utility model content

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a low-cost condenser hot well liquid level control system for steam turbines.

The purpose of this utility model adopts following technical scheme to realize:

A liquid level control system for a condenser hot well for a steam turbine, comprising a liquid level transmitter, a controller, a three-way regulating valve and a condensate pump, the input end of the controller is electrically connected with the liquid level transmitter, and the control The output end of the device is electrically connected to the three-way regulating valve, the liquid level transmitter is connected to the hot well, and the liquid level transmitter is used to detect the change of the liquid level of the hot well and raise or lower the detected liquid level The signal is transmitted to the controller, the inlet of the three-way regulating valve is communicated with the outlet of the condensate pump, the first outlet of the three-way regulating valve is communicated with the external drainage system, and the first outlet of the three-way regulating valve is communicated with the external drainage system. Two outlets communicate with the hot well.

Further, a main condensate pipeline is also included, and the main condensate pipeline communicates with the hot well and the inlet of the three-way regulating valve.

Further, a recirculation pipeline is also included, and the recirculation pipeline communicates with the second outlet of the three-way regulating valve and the hot well.

Further, a drainage pipeline is also included, and the drainage pipeline communicates with the first outlet of the three-way regulating valve and the external drainage system.

Further, the three-way regulating valve is an electric valve or a pneumatic valve.

Compared with the prior art, the beneficial effects of the present utility model are:

The steam turbine condenser hot well liquid level control system can achieve the purpose of adjusting the hot well liquid level by controlling the outlet opening of the three-way regulating valve, so as to keep the hot well liquid level stable and avoid abnormal hot well liquid levels. The setup saves a regulator valve, thereby reducing costs.

Description of drawings

1 is a schematic structural diagram of a steam turbine condenser hot well liquid level control system in the prior art;

2 is a schematic structural diagram of a hot well liquid level control system for a condenser for a steam turbine of the present invention.

In the figure: 1. Hot well; 2. Liquid level transmitter; 3. Controller; 4. Condensate main pipeline; 5. Condensate pump; 6. Three-way regulating valve; 7. Recirculation pipeline; 8. Drain pipeline .

Detailed ways

Hereinafter, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new implementations. example.

Referring to FIG. 2, a preferred embodiment of the present utility model shows a steam turbine condenser hot well liquid level control system, which is used to adjust the liquid level of the hot well 1, so that the liquid level of the hot well 1 is in a stable state, Specifically, it includes a liquid level transmitter 2, a controller 3, a main condensate pipeline 4, a condensate pump 5, a three-way regulating valve 6, a recirculation pipeline 7 and a drainage pipeline 8, wherein the input end of the controller 3 is connected to the The liquid level transmitter 2 is electrically connected, the output end of the controller 3 is electrically connected with the three-way regulating valve 6, the liquid level transmitter 2 is connected with the hot well 1, and the liquid level transmitter 2 is used to detect the change of the liquid level of the hot well 1 and transmit the detected liquid level rising or falling signal to the controller 3, so that the controller 3 controls the outlet opening of the three-way regulating valve 6, so The condensate main pipeline 4 is connected to the inlet of the hot well 1 and the three-way regulating valve 6, the condensate pump 5 is installed on the condensate main pipeline 4, and the inlet of the three-way regulating valve 6 is connected to the inlet of the three-way regulating valve 6. The outlet of the condensate pump 5 is communicated with, the first outlet of the three-way regulating valve 6 is communicated with the external drainage system through the drainage pipeline 8, and the second outlet of the three-way regulating valve 6 is connected with the heat exchanger through the recirculation pipeline 7. Well 1 is connected.

When the liquid level of the hot well 1 is higher than the set maximum liquid level, the liquid level transmitter 2 sends a signal to the controller 3, so that the controller 3 controls the opening of the first outlet of the three-way regulating valve 6 to gradually increase At the same time, the opening degree of the second outlet of the three-way regulating valve 6 is controlled to gradually decrease, so that the discharge amount of condensed water passing through the inlet of the three-way regulating valve 6 to the first opening is increased, and the The return flow of condensed water from the inlet to the second outlet of the three-way regulating valve 6 decreases; when the liquid level is lower than the set minimum liquid level, the liquid level transmitter 2 sends a signal to the controller 3, so that the controller 3 Control the opening degree of the first outlet of the three-way regulating valve 6 to gradually decrease, and control the opening degree of the second outlet of the three-way regulating valve 6 to gradually increase, so that the discharge of condensate water is reduced and the condensate is increased at the same time. water return flow. The steam turbine condenser hot well liquid level control system can achieve the purpose of adjusting the liquid level of the hot well 1 by controlling the outlet opening of the three-way regulating valve 6, so as to keep the liquid level of the hot well 1 stable and avoid the abnormal liquid level of the hot well 1 , such a structure arrangement can save a regulating valve, thereby reducing the cost.

As a preferred embodiment, the three-way regulating valve 6 is an electric valve or a pneumatic valve. In this embodiment, the three-way regulating valve 6 is preferably an electric valve.

The above-mentioned embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited by this. Any insubstantial changes and replacements made by those skilled in the art on the basis of the present invention belong to the scope of the present invention. The scope of protection of the utility model.

Claims (5)

1. Condenser hot well liquid level control system for steam turbine, its characterized in that, including liquid level transmitter, controller, three way control valve and condensate pump, the input of controller with the liquid level transmitter electricity is connected, the output of controller with the three way control valve electricity is connected, liquid level transmitter is connected with the hot well, liquid level transmitter is used for detecting hot well liquid level change and with the liquid level that detects rise or decline signal transmission extremely the controller, three way control valve's entry with the export intercommunication of condensate pump, three way control valve's first export and external drainage system intercommunication, three way control valve's second export with the hot well intercommunication.

2. The system of claim 1, further comprising a main condensate conduit communicating the hot well with the inlet of the three-way regulator valve.

3. The condenser hot well liquid level control system for a steam turbine of claim 1, further comprising a recirculation conduit communicating the second outlet of the three-way regulating valve and the hot well.

4. The system of claim 1, further comprising a drain conduit communicating the first outlet of the three-way valve with an external drain system.

5. The system of claim 1, wherein the three-way regulating valve is an electric valve or a pneumatic valve.

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