Heat-engine plant condenser vacuum efficient energy-saving maintaining unit

Abstract

The utility model discloses a vacuum efficient energy-saving maintaining unit for a condenser of a thermal power plant. The vacuum efficient energy-saving maintaining unit comprises a support, a roots pump, a roots pump heat exchanger, a liquid ring vacuum pump, a gas-water separator and a liquid ring vacuum pump heat exchanger. An air inlet of the roots pump heat exchanger is connected with an exhaust port of the roots pump through a pipeline; an exhaust port of the roots pump heat exchanger is connected with an air inlet of the liquid ring vacuum pump through a pipeline; an exhaust port of the liquid ring vacuum pump is connected with a gas inlet of the gas-water separator through a pipeline; a cooling liquid outlet in the liquid ring vacuum pump heat exchanger is connected with a cooling liquid inlet of the roots pump heat exchanger through a pipeline; the bottom of the gas-water separator is connected with a liquid inlet pipeline, one end of the liquid inlet pipeline is connected with the gas-water separator, and the other end of the liquid inlet pipeline is connected with the liquid ring vacuum pump heat exchanger; the liquid ring vacuum pump heat exchanger is connected with a liquid outlet pipeline; one end of the liquid outlet pipeline is connected with the liquid ring vacuum pump heat exchanger, and the other end is connected with the liquid ring vacuum pump. The energy consumption index is reduced, and the indexes of energy conservation, environmental protection, economy and the like are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum energy-saving transformation of thermal power plants, in particular to a high-efficiency energy-saving vacuum maintenance unit for a condenser in a thermal power plant. Background Art

[0002] Currently, thermal power plants use large water ring pumps to pump out condenser vacuum. This solution involves connecting two or three large water ring pumps to the condenser vacuum main, one for use and one for backup, and commissioning them simultaneously with condenser startup. This structure has the following drawbacks: The large water ring pumps require a large amount of cooling circulating water, resulting in high water consumption; they occupy a large footprint, and their internal impellers are prone to cavitation, resulting in high maintenance costs and impacting the normal operation of the power plant; the vacuum level of these large water ring pumps is poor and unstable; and most importantly, their motors are high-powered, noisy, and consume a lot of electricity, making them uneconomical and energy-consuming.

[0003] It is hoped to provide a high-efficiency and energy-saving vacuum maintenance unit for a condenser in a thermal power plant, so as to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this utility model is to provide a high-efficiency and energy-saving vacuum maintenance unit for a condenser in a thermal power plant, which can solve the above-mentioned problems and shortcomings, greatly reduce energy consumption indicators, and achieve energy conservation, environmental protection, and economic indicators.

[0005] A high-efficiency and energy-saving vacuum maintenance unit for a condenser in a thermal power plant, comprising a bracket, a Roots pump, a Roots pump heat exchanger, a liquid ring vacuum pump, a gas-water separator, and a liquid ring vacuum pump heat exchanger;

[0006] The Roots pump is arranged on the top of the bracket, the air inlet of the Roots pump is located at the top of the Roots pump, a valve is provided on the air inlet of the Roots pump, and the exhaust port of the Roots pump is located at the bottom of the Roots pump;

[0007] The air inlet of the Roots pump heat exchanger is connected to the exhaust port of the Roots pump through a pipeline;

[0008] The exhaust port of the Roots pump heat exchanger is connected to the air inlet of the liquid ring vacuum pump through a pipeline;

[0009] The exhaust port of the liquid ring vacuum pump is connected to the air inlet of the gas-water separator through a pipeline;

[0010] The exhaust port of the gas-water separator is arranged vertically upward;

[0011] The coolant inlet on the liquid ring vacuum pump heat exchanger is connected to an external coolant pipeline, and the coolant outlet on the liquid ring vacuum pump heat exchanger is connected to the coolant inlet of the Roots pump heat exchanger through a pipeline;

[0012] The coolant outlet of the Roots pump heat exchanger is connected to an external coolant recovery pipeline;

[0013] The bottom of the gas-water separator is connected to a liquid inlet pipe, one end of the liquid inlet pipe is connected to the gas-water separator, and the other end is connected to the liquid ring vacuum pump heat exchanger;

[0014] The liquid ring vacuum pump heat exchanger is connected to a liquid outlet pipe;

[0015] One end of the liquid outlet pipe is connected to the liquid ring vacuum pump heat exchanger, and the other end is connected to the liquid ring vacuum pump.

[0016] Specifically, the valve is a pneumatic valve.

[0017] Preferably, the air inlet of the Roots pump heat exchanger is connected to the exhaust port of the Roots pump through a corrugated hose.

[0018] Preferably, the Roots pump is connected to a return pipe, one end of which is connected to a pipe connected to the exhaust port of the Roots pump heat exchanger and the air inlet of the liquid ring vacuum pump, and the other end of the return pipe is connected to the air inlet of the Roots pump.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) A two-stage vacuum pump series design is adopted to form a two-stage high-efficiency Roots liquid ring vacuum unit. The liquid ring vacuum pump is used as the front pump, so it is particularly suitable for pumping gases with high humidity and industrial processes containing a large amount of water vapor condensable gases. The main pump adopts an air-cooled Roots pump. The unit can realize the automatic start and stop of the Roots vacuum pump and the liquid ring vacuum pump through the pressure transmitter and the electrical control system, automatic overload and overheat protection, and automatic control of various instruments and valves to form a complete set of vacuum acquisition equipment solutions;

[0021] (2) Water consumption: only a small amount of cooling circulating water is required; Floor space and maintenance cost: small footprint, easy installation, and basically no maintenance is required under normal maintenance; Vacuum degree: variable frequency adjustment, stable vacuum degree; Energy consumption: energy saving index is more than 60% of the original, low noise, economical and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a thermal power plant condenser vacuum high-efficiency energy-saving maintenance unit in this embodiment. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of a thermal power plant condenser vacuum high-efficiency energy-saving maintenance unit in this embodiment. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the structure of a thermal power plant condenser vacuum high-efficiency energy-saving maintenance unit in this embodiment. Figure 3 . DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1 、 Figure 2 and Figure 3 As shown, a high-efficiency and energy-saving vacuum maintenance unit for a condenser in a thermal power plant includes a bracket 1, a Roots pump 2, a Roots pump heat exchanger 3, a liquid ring vacuum pump 4, a gas-water separator 5, and a liquid ring vacuum pump heat exchanger 6.

[0027] The Roots pump 2 is disposed on the top of the bracket 1. The air inlet 7 of the Roots pump 2 is located at the top of the Roots pump 2. A valve 8 is provided on the air inlet 7 of the Roots pump 2. In this embodiment, the valve 8 is a pneumatic valve. The exhaust port of the Roots pump 2 is located at the bottom of the Roots pump.

[0028] The air inlet of the Roots pump heat exchanger 3 is connected to the exhaust port of the Roots pump 2 through a pipeline. Figure 2 As shown, the air inlet of the Roots pump heat exchanger 3 is connected to the exhaust port of the Roots pump 2 through a corrugated hose 9, which improves the flexibility of installation and facilitates quick installation.

[0029] The exhaust port of the Roots pump heat exchanger 3 is connected to the air inlet of the liquid ring vacuum pump 4 through a pipe 10; the exhaust port of the liquid ring vacuum pump 4 is connected to the air inlet of the gas-water separator 5 through a pipe 11; the exhaust port of the gas-water separator 5 is arranged vertically upward.

[0030] like Figure 3 As shown, the coolant inlet 12 on the liquid ring vacuum pump heat exchanger 6 is connected to the external coolant pipeline, and the coolant outlet on the liquid ring vacuum pump heat exchanger 6 is connected to the coolant inlet of the Roots pump heat exchanger 3 through the pipeline 13; the coolant outlet 17 of the Roots pump heat exchanger 3 is connected to the external coolant recovery pipeline.

[0031] The bottom of the gas-water separator 5 is connected to a liquid inlet pipe 14, one end of the liquid inlet pipe 14 is connected to the gas-water separator 5, and the other end is connected to the liquid ring vacuum pump heat exchanger 6; the liquid ring vacuum pump heat exchanger 6 is connected to a liquid outlet pipe 15; one end of the liquid outlet pipe 15 is connected to the liquid ring vacuum pump heat exchanger 6, and the other end is connected to the liquid ring vacuum pump 4; such an arrangement allows the liquid in the liquid ring vacuum pump 4 to be cooled after heat exchange, effectively ensuring its normal operation.

[0032] In this embodiment, a return pipe 16 is connected to the Roots pump 2, one end of the return pipe 16 is connected to the pipe connected to the exhaust port of the Roots pump heat exchanger 3 and the air inlet of the liquid ring vacuum pump 4, and the other end of the return pipe 16 is connected to the air inlet of the Roots pump 2; in this way, the gas-water mixture can be compressed and cooled for the second time, thereby improving the compression and cooling effect of the gas-water mixture.

[0033] After the high-efficiency Roots vacuum unit is installed at the power plant, the air inlet 7 of Roots pump 2 is connected to the condenser vacuum main pipe, the exhaust port is directly discharged on-site, and the cooling circulating water pipeline is connected to the site. After all components are connected, the unit is started up and commissioned on-site. Once all local commissioning is normal, remote commissioning is performed. Once remote commissioning is normal, everything is normal again. Once the power plant is operating normally and the original large water ring vacuum pump is operating stably and all indicators are normal, the high-efficiency Roots vacuum unit can be put into operation. Once operation is stable, the original large water ring vacuum pump can be shut down, and the high-efficiency and energy-saving Roots vacuum unit can continue to operate. This high-efficiency and energy-saving Roots vacuum unit is connected to the power plant's condenser vacuum main pipe. During unit startup, the original large water ring vacuum pump operates to achieve rapid vacuum. During normal operation, the unit switches to the high-efficiency and energy-saving Roots vacuum pump unit to maintain vacuum, and the original water ring vacuum pump is shut down. This energy-saving vacuum pump unit operates continuously, with the original water ring vacuum pump serving as a backup.

Claims

1. A high-efficiency and energy-saving vacuum maintenance unit for a condenser in a thermal power plant, characterized in that: Including bracket, Roots pump, Roots pump heat exchanger, liquid ring vacuum pump, gas-water separator and liquid ring vacuum pump heat exchanger; The Roots pump is arranged on the top of the bracket, the air inlet of the Roots pump is located at the top of the Roots pump, a valve is provided on the air inlet of the Roots pump, and the exhaust port of the Roots pump is located at the bottom of the Roots pump; The air inlet of the Roots pump heat exchanger is connected to the exhaust port of the Roots pump through a pipeline; The exhaust port of the Roots pump heat exchanger is connected to the air inlet of the liquid ring vacuum pump through a pipeline; The exhaust port of the liquid ring vacuum pump is connected to the air inlet of the gas-water separator through a pipeline; The exhaust port of the gas-water separator is arranged vertically upward; The coolant inlet on the liquid ring vacuum pump heat exchanger is connected to an external coolant pipeline, and the coolant outlet on the liquid ring vacuum pump heat exchanger is connected to the coolant inlet of the Roots pump heat exchanger through a pipeline; The coolant outlet of the Roots pump heat exchanger is connected to an external coolant recovery pipeline; The bottom of the gas-water separator is connected to a liquid inlet pipe, one end of the liquid inlet pipe is connected to the gas-water separator, and the other end is connected to the liquid ring vacuum pump heat exchanger; The liquid ring vacuum pump heat exchanger is connected to a liquid outlet pipe; One end of the liquid outlet pipe is connected to the liquid ring vacuum pump heat exchanger, and the other end is connected to the liquid ring vacuum pump.

2. A thermal power plant condenser vacuum high-efficiency energy-saving maintenance unit according to claim 1, characterized in that: The valve is a pneumatic valve.

3. A thermal power plant condenser vacuum high-efficiency energy-saving maintenance unit according to claim 1, characterized in that: The air inlet of the Roots pump heat exchanger is connected to the exhaust port of the Roots pump through a corrugated hose.

4. A thermal power plant condenser vacuum high-efficiency energy-saving maintenance unit according to any one of claims 1 to 3, characterized in that: The Roots pump is connected to a return pipe, one end of which is connected to a pipe connected to the exhaust port of the Roots pump heat exchanger and the air inlet of the liquid ring vacuum pump, and the other end of the return pipe is connected to the air inlet of the Roots pump.

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