CN213743548U

CN213743548U - 300MW extraction condensing unit optical axis heating system

Info

Publication number: CN213743548U
Application number: CN202022712328.XU
Authority: CN
Inventors: 王海成; 张虔; 任怀民; 付亚州; 裴辉; 邵金利; 韩振东; 郑志权; 刘永义; 周国锋; 刘建华; 岳建楠; 李媛
Original assignee: Shandong Huadian Energy Saving Technology Co ltd; Jiamusi Heat And Power Plant Of Huadian Energy Co ltd
Current assignee: Shandong Huadian Energy Saving Technology Co ltd; Jiamusi Heat And Power Plant Of Huadian Energy Co ltd
Priority date: 2020-11-22
Filing date: 2020-11-22
Publication date: 2021-07-20
Anticipated expiration: 2030-11-22

Abstract

300MW extraction condensing unit optical axis heating system. In the power plant, after the optical axis is transformed, the communicating pipe of the medium-low pressure cylinder in the unit is detached, and the temperature-reducing steam pipeline with the smaller pipe diameter is replaced, so that when the unit is started and runs at a low load, the steam exhaust and air blast of the medium-low pressure cylinder are larger, and the unit is difficult to start and the exhaust temperature in the low-load running is overhigh. The utility model discloses the constitution includes: steam turbine low pressure jar (7) and steam turbine high and medium pressure jar (8), steam turbine low pressure jar take over (14) through well exhaust steam and be connected with steam turbine high and medium pressure jar, steam turbine high and medium pressure jar be connected with heat supply network heating network (1) through heat supply extraction steam pipe way (13), heat supply network heating network be connected with heat supply network circulating water pump (2), dredge pump (3), the dredge pump be connected with condenser hot-well (6), the condenser hot-well be connected with steam turbine low pressure jar, condensate pump (5). The utility model discloses be applied to the thermoelectricity field.

Description

300MW extraction condensing unit optical axis heating system

Technical Field

The utility model relates to a thermoelectric equipment technical field, concretely relates to unit optical axis heating system is congealed to 300MW extraction.

Background

With the increase of the treatment strength of the country on the environmental pollution, the elimination of the conventional coal-fired thermal power generating unit with the design service life expiration below the single machine capacity of 300MW grade and without heat supply reconstruction is accelerated. In order to meet the requirements of national energy-saving and emission-reducing policies and increase the index competitiveness of a power plant, the power plant implements the transformation of an optical axis back pressure machine on a condensing unit, thereby increasing the heat supply capacity and reducing the coal consumption for power generation. After the optical axis is transformed, the communicating pipe of the medium-low pressure cylinder in the unit is detached, and the temperature-reducing steam pipeline with smaller pipe diameter is replaced, so that the steam exhaust and air blast of the medium-low pressure cylinder are larger when the unit is started and runs at low load, and the unit is difficult to start and the exhaust temperature is overhigh in the low-load running. In addition, because the steam inlet amount of the low-pressure cylinder is basically zero and the steam extraction amount of the low-pressure heater is zero, the output of the deaerator is insufficient, and the deaerating effect is influenced.

Disclosure of Invention

The utility model aims at providing a set optical axis heating system is congealed to 300MW extraction.

The above purpose is realized by the following technical scheme:

the utility model provides a set optical axis heating system is congealed to 300MW extraction, its constitution includes: the low-pressure turbine cylinder is connected with the high-pressure turbine cylinder through a middle exhaust steam connecting pipe, the high and medium pressure cylinder of the steam turbine is connected with a heating network through a heat supply steam extraction pipeline, the heating network is connected with a heating network circulating water pump and a drain pump, the drain pump is connected with a condenser hot well, the condenser hot well is connected with a turbine low-pressure cylinder and a condensate pump, the condensed water pump is connected with a No. 6 low-pressure heater, the No. 6 low-pressure heater is connected with a deaerator, the middle exhaust steam connecting pipe is respectively connected with the starting bypass steam pipeline, the No. 6 low heating steam pipeline and the temperature-reducing steam pipeline, the starting bypass steam pipeline is connected with a condenser hot well, the No. 6 low-pressure steam adding pipeline is connected with the No. 6 low-pressure heater, and the temperature-reducing steam pipeline is connected with a steam turbine low-pressure cylinder.

300MW extraction and condensation unit optical axis heating system, heat supply extraction steam pipe on install first valve group, No. 6 low steam pipe that adds on install second valve group, start bypass steam pipe on install third valve group, the steam pipe that reduces the temperature on install fourth valve group.

The utility model has the advantages that:

the utility model relates to a 300MW extraction and condensation unit optical axis heating system, improve former well low pressure communicating pipe, the exhaust takeover in the increase, branch starts bypass steam conduit on well exhaust takeover simultaneously, No. 6 low heating steam conduit and temperature reduction steam conduit, the heat supply is taken out the vapour and is got into heat supply network heater heating heat supply network water through former steam extraction pipeline, the low pressure jar communicating pipe in the unit is demolishd after having solved the optical axis transformation, when causing unit start and low-load operation, the exhaust steam air blast of medium pressure jar is great, the unit starts the too high problem of row's temperature in difficult and the low-load operation, improve the deoxidization effect, choose the outer part precision of purchasing that the commonality is high for use high, precision to machining reduces to some extent, reduce the processing cost.

Description of the drawings:

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

in the figure: 1. the heat supply network heating system comprises a heat supply network heating network, 2, a heat supply network circulating water pump, 3, a drain pump, 4, 6 low-pressure heaters, 5, a condensate pump, 6, a condenser hot well, 7, a steam turbine low-pressure cylinder, 8, a steam turbine high-intermediate pressure cylinder, 9, a first valve group, 10, a second valve group, 11, a third valve group, 12, a fourth valve group, 13, a heat supply steam extraction pipeline, 14, a middle exhaust steam connecting pipe, 15, a temperature reduction steam pipeline, 16, 6 low-pressure steam pipelines, 17, a starting bypass steam pipeline, 18 and a deaerator.

The specific implementation mode is as follows:

example 1:

the utility model provides a set optical axis heating system is congealed to 300MW extraction, its constitution includes: the steam turbine low-pressure cylinder 7 and the steam turbine high-pressure and medium-pressure cylinder 8 are connected with the steam turbine high-pressure and medium-pressure cylinder through a medium exhaust steam connecting pipe 14, the steam turbine high-pressure and medium-pressure cylinder is connected with a heat supply network heating network 1 through a heat supply steam extraction pipeline 13, the heat supply network heating network is connected with a heat supply network circulating water pump 2 and a drain pump 3, the drain pump is connected with a condenser hot well 6, the condenser hot well is connected with the steam turbine low-pressure cylinder and a condensate pump 5, the condensate pump is connected with a No. 6 low-pressure heater 4, the No. 6 low-pressure heater is connected with a deaerator 18, the medium exhaust steam connecting pipe is respectively connected with a starting bypass steam pipeline 17, a No. 6 low-pressure steam pipeline 16 and a temperature reduction steam pipeline 15, the starting bypass steam pipeline is connected with the condenser hot well, and the No. 6 low-pressure steam pipeline is connected with the No. 6 low-pressure heater, and the temperature-reducing steam pipeline is connected with the low-pressure cylinder of the steam turbine.

Example 2:

according to the 300MW extraction and condensation unit optical axis heating system in the embodiment 1, a first valve set 9 is installed on a heating extraction steam pipeline, a second valve set 10 is installed on a No. 6 low steam adding pipeline, a third valve set 11 is installed on a starting bypass steam pipeline, and a fourth valve set 12 is installed on a temperature reducing steam pipeline;

the working principle is as follows: when the unit is started, the first valve group, the second valve group and the drain pump are closed, and the third valve group, the fourth valve group and the condensate pump are opened. Vacuum is established for the steam exhaust port of the high and medium pressure cylinder of the steam turbine by starting the bypass steam pipeline and the temperature reduction steam pipeline, so that the blast heat is reduced;

and when the unit operates with a stable load, closing the third valve group and the fourth valve group, and opening the first valve group, the second valve group, the drain pump and the condensate pump. At the moment, the middle exhaust steam completely enters a heat supply network initial station through an original heat supply steam extraction pipeline, after condensation, drained water enters a condenser hot well, and then is discharged into a deaerator through a No. 6 low-pressure heater. Along with the load change, when the electric load is lower, the temperature of the middle exhaust steam connecting pipe is higher than 350 ℃, and the third valve group is opened to maintain the stable operation of the middle exhaust steam connecting pipe at the temperature lower than 350 ℃.

Claims

1. The utility model provides a set optical axis heating system is congealed to 300MW extraction, its constitution includes: steam turbine low pressure jar and steam turbine high and medium pressure jar, characterized by: the steam turbine low pressure jar take over and be connected with the high intermediate pressure jar of steam turbine through well exhaust steam, the high intermediate pressure jar of steam turbine be connected with the heat supply network heating through heat supply extraction steam pipe way, the heat supply network heating be connected with heat supply network circulating water pump, dredge pump, the dredge pump be connected with the condenser heat well, the condenser heat well be connected with steam turbine low pressure jar, condensate pump and No. 6 low pressure feed water heater are connected, No. 6 low pressure feed water heater be connected with the oxygen-eliminating device, well exhaust steam take over respectively with start bypass steam conduit, No. 6 low steam pipe and desuperheating steam pipe way connection, start bypass steam conduit and condenser heat well be connected, No. 6 low steam pipe and No. 6 low pressure feed water heater be connected, desuperheating steam conduit be connected with the steam turbine low pressure jar.

2. The 300MW extraction-condensing unit optical axis heating system according to claim 1, characterized in that: the steam heating and extracting pipeline is provided with a first valve set, the No. 6 low steam adding pipeline is provided with a second valve set, the starting bypass steam pipeline is provided with a third valve set, and the temperature reducing steam pipeline is provided with a fourth valve set.