阅读说明：本技术 燃煤发电机组回热系统凝结水能量利用装置 (Condensed water energy utilization device of regenerative system of coal-fired generator set ) 是由 李建锋 于 2021-10-15 设计创作，主要内容包括：本发明公开了一种燃煤发电机组回热系统凝结水能量利用装置,其特征在于,包括加热器、水轮机、阀门、发电机,燃煤发电机组回热系统的2个相邻加热器之间的调节阀旁安装有旁路,旁路上安装有一个水轮机,水轮机的进出口均安装有阀门,水轮机的转轴与发电机相连接。(The invention discloses a condensed water energy utilization device of a coal-fired generator set regenerative system, which is characterized by comprising heaters, water turbines, valves and a generator, wherein a bypass is arranged beside a regulating valve between 2 adjacent heaters of the coal-fired generator set regenerative system, the water turbine is arranged on the bypass, valves are arranged at the inlet and the outlet of the water turbine, and a rotating shaft of the water turbine is connected with the generator.)

1. The condensed water energy utilization device of the coal-fired generator set regenerative system is characterized by comprising heaters, water turbines, valves and a generator, wherein a bypass is arranged beside a regulating valve between 2 adjacent heaters of the coal-fired generator set regenerative system, the water turbines are arranged on the bypass, the valves are arranged at the inlet and the outlet of each water turbine, and rotating shafts of the water turbines are connected with the generator.

Technical Field

The invention relates to a condensed water energy utilization device of a regenerative system of a coal-fired generator set.

Background

In large thermal power plants, in order to improve the system efficiency, a multi-stage regenerative method is generally adopted, i.e., part of steam is extracted at a plurality of positions in a steam turbine, and the heat of the extracted steam is released to a boiler for water supply through a plurality of heat exchangers, so that the temperature of the water supply is gradually increased, and finally the cycle efficiency of the thermal power plant is improved. After the steam is heated in the heater to supply water, the steam is condensed into water, enters the next-stage heater by adopting a mode of pressure reduction and self-flow of the regulating valve, and finally flows into the boiler water supply. Specifically, the condensed water of the No. 1 high-pressure heater of the regenerative system will be decompressed and automatically flow into the No. 2 high-pressure heater, the condensed water of the No. 2 high-pressure heater will flow into the No. 3 high-pressure heater, and the condensed water of the No. 3 high-pressure heater will flow into the deaerator. Similarly, the condensed water of the low-pressure heater follows the same rule and finally flows into the hot well of the turbine condenser. The condensed water in the hot water well is pressurized by a condensed water pump, flows through No. 8, No. 7, No. 6 and No. 5 low-pressure heaters in sequence and then enters a deaerator, and then flows through No. 3, No. 2 and No. 1 high-pressure heaters in sequence and enters a boiler economizer after being pressurized by a water feeding pump.

Although the system can fully utilize the heat of the extracted steam, the pressure energy of the extracted steam cannot be fully utilized, for example, a 600MW thermal generator set, the pressure of the 1-stage extracted steam is generally 5-7 MPa, namely, the pressure of the condensed water of the No. 1 high-pressure heater is also 5-7 MPa, but the pressure of the deaerator is only 0.7-0.9 MPa, so that the pressure energy of the condensed water cannot be fully utilized in the conventional stage-by-stage gravity flow mode, and the condensed water is wasted.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a device capable of utilizing the pressure energy of the condensed water of a heater.

The technical scheme adopted by the invention is as follows: the condensed water energy utilization device of the coal-fired generator set regenerative system is characterized by comprising heaters, a water turbine, valves and a generator, wherein a bypass is arranged beside a regulating valve between 2 adjacent heaters of the coal-fired generator set regenerative system, the water turbine is arranged on the bypass, the valves are arranged at an inlet and an outlet of the water turbine, and a rotating shaft of the water turbine is connected with the generator.

The invention has simple structure and less investment and can improve the power supply efficiency of a power plant.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Detailed Description

The present invention is described in further detail below with reference to the attached drawings.

The reference numerals are explained below:

1. 4, 7-high pressure heater 2, 5, 8-bypass adjusting valve

1. 3-heater 2-regulating valve 4-heater condensed water outlet

5. 8-stop valve 6-generator 7-water turbine

9-heater condensed water inlet

In the embodiment shown in fig. 1, a bypass is installed beside a regulating valve 2 between 2 adjacent heaters 1 and 3 of a coal-fired generator set regenerative system, a water turbine 7 is installed on the bypass, a stop valve 8 is installed at the inlet of the water turbine 7, a stop valve 5 is installed at the outlet of the water turbine 7, and the water turbine 7 is connected with a generator 6.

In the normal power generation process of the coal-fired thermal power generating set, the regulating valve 2 between the heater 1 and the heater 3 is closed, the bypass stop valve 5 and the stop valve 8 are opened, so that the condensed water flowing out of the heater 1 can drive the water turbine 7 to rotate, the water turbine 7 drives the generator 6 to generate power, and the water flowing out of the water turbine 7 enters the heater 3. When the water turbine 7 breaks down or needs maintenance, the stop valves 8 and 5 at the inlet and the outlet of the water turbine 7 can be closed, the regulating valve 2 is opened, and meanwhile, the whole coal-fired power generating set can still run normally.

The present invention is not limited to the above-described preferred embodiments, and various other forms of products can be obtained by anyone in light of the present invention. However, any changes in shape or structure, which are the same or similar to the technical solutions of the present invention, are within the protection scope.