CN215523471U

CN215523471U - Self-adjusting system for reasonably distributing drainage of heat supply networks of multiple heat supply steam extraction units

Info

Publication number: CN215523471U
Application number: CN202120682453.2U
Authority: CN
Inventors: 陈真; 张才稳; 董霖; 张佳佳; 张志勇; 卢杰
Original assignee: Huadian Electric Power Research Institute Co Ltd
Current assignee: Huadian Electric Power Research Institute Co Ltd
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2022-01-14
Anticipated expiration: 2031-04-02

Abstract

The utility model discloses a self-adjusting system for reasonably distributing drainage of a heat supply network of a multi-heat-supply steam extraction unit, belonging to the technical field of heat economy of a thermal power plant. By researching the relation between the power generation load of the heat supply unit and the corresponding heat supply extraction steam (drainage) flow, fully considering the unequal relation of the extraction steam flows of different units and combining with the valve flow characteristic function, the reasonable distribution of the corresponding drainage flow of the heat supply extraction steam is realized, the manual intervention is effectively reduced, and the method has higher practical application value.

Description

Self-adjusting system for reasonably distributing drainage of heat supply networks of multiple heat supply steam extraction units

Technical Field

The utility model relates to a self-adjusting system for reasonably distributing drainage of a heat network of a multi-heat-supply steam extraction unit, and belongs to the technical field of heat economy of thermal power plants.

Background

At present, to many heat supply units of power plant draw steam simultaneously to external heating, the drainage rational distribution that heat supply steam extraction formed after releasing heat in the heat supply network heater is a difficult problem. By researching the relation between the power generation load of the heat supply unit and the corresponding heat supply extraction steam (drainage) flow and fully considering the unequal relation of the extraction steam flows of different units, the utility model provides the self-adjusting system for reasonably distributing the drainage steam of the heat supply network of the multi-heat supply extraction unit, which can realize the reasonable distribution of the drainage flow corresponding to the heat supply extraction steam and provide a solution for reasonably distributing the drainage steam of the heat supply network heater.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a self-adjusting system which is reasonable in structural design and reliable in performance and is used for reasonably distributing drainage of a heat supply network of a multi-heat-supply steam extraction unit.

The technical scheme adopted by the utility model for solving the problems is as follows: a self-adjusting system for reasonably distributing drainage of a heat supply network of a multi-heat supply steam extraction unit is characterized by comprising a first steam turbine, a second steam turbine, a heat supply network heater, a drainage box, a first drainage pump, a second drainage pump, a first deaerator and a second deaerator; the heat supply steam extraction port of the first steam turbine is connected with the heat supply network heater through a first pipeline, a first flowmeter, a second pipeline, a first valve and a third pipeline, the heat supply steam extraction port of the second steam turbine is connected with the heat supply network heater through a sixth pipeline, a second flowmeter, a fifth pipeline, a second valve and a fourth pipeline, the drain port of the heat supply network heater is connected with the water inlet of a drain box through a seventh pipeline, a third valve and an eighth pipeline, the drain box is provided with a liquid level meter, the water outlet of the drain box is respectively connected with the water inlets of a first drain pump and a second drain pump through a ninth pipeline and a tenth pipeline, the ninth pipeline and the tenth pipeline are respectively provided with a fourth valve and a fifth valve, the water outlet of the first drain pump is connected with a thirteenth pipeline through an eleventh pipeline, the water outlet of the second drain pump is connected with a thirteenth pipeline through a twelfth pipeline, a sixth valve and a seventh valve are respectively arranged on the eleventh pipeline and the twelfth pipeline; the thirteenth pipeline is connected with a twentieth pipeline through a third flow meter, the twentieth pipeline is divided into two paths, one path is connected with the first deaerator through a fourteenth pipeline, an eighth valve, a fifteenth pipeline, a fourth flow meter and a sixteenth pipeline, and the other path is connected with the second deaerator through a seventeenth pipeline, a ninth valve, an eighteenth pipeline, a fifth flow meter and a nineteenth pipeline.

Furthermore, the heat supply steam extraction flow of the first steam turbine and the heat supply steam extraction flow of the second steam turbine are controlled and adjusted through a first valve and a second valve respectively, and the drain flow entering the first deaerator and the second deaerator is controlled and adjusted through an eighth valve and a ninth valve respectively.

Further, the driving motors of the first and second drainage pumps have a frequency conversion function, and the frequency or current magnitude thereof is associated with the indication number of the liquid level meter, and when the indication number of the liquid level meter becomes larger (or smaller), the frequency or current also increases (or decreases).

Further, the first valve, the second valve, the eighth valve and the ninth valve have adjusting and stopping functions.

Compared with the prior art, the utility model has the following advantages and effects: the utility model realizes the reasonable distribution of the drainage flow corresponding to the heat supply extraction steam, can automatically adjust the drainage flow through the valve, effectively reduces the manual intervention, and has simple operation and convenient control.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure: a first turbine 1, a second turbine 2, a heat supply network heater 3, a drain tank 4, a first drain pump 5, a second drain pump 6, a first deaerator 7, a second deaerator 8, a first flowmeter 9, a second flowmeter 10, a third flowmeter 11, a fourth flowmeter 12, a fifth flowmeter 13, a first valve 14, a second valve 15, a third valve 16, a fourth valve 17, a fifth valve 18, a sixth valve 19, a seventh valve 20, an eighth valve 21, a ninth valve 22, a level gauge 23, a first pipe 24, a second pipe 25, a third pipe 26, a fourth pipe 27, a fifth pipe 28, a sixth pipe 29, a seventh pipe 30, an eighth pipe 31, a ninth pipe 32, a tenth pipe 33, an eleventh pipe 34, a twelfth pipe 35, a thirteenth pipe 36, a fourteenth pipe 37, a fifteenth pipe 38, a sixteenth pipe 39, a seventeenth pipe 40, Eighteenth 41, nineteenth 42, twentieth 43 conduits.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

Examples are given.

Referring to fig. 1, in this embodiment, a self-regulating system for reasonably distributing drainage of a heat supply network of a multi-heat supply steam extraction unit includes a first steam turbine 1, a second steam turbine 2, a heat supply network heater 3, a drainage tank 4, a first drainage pump 5, a second drainage pump 6, a first deaerator 7, and a second deaerator 8; the heat supply steam extraction port of the first steam turbine 1 is connected with the heat supply network heater 3 through a first pipeline 24, a first flowmeter 9, a second pipeline 25, a first valve 14 and a third pipeline 26, the heat supply steam extraction port of the second steam turbine 2 is connected with the heat supply network heater 3 through a sixth pipeline 29, a second flowmeter 10, a fifth pipeline 28, a second valve 15 and a fourth pipeline 27, the drain port of the heat supply network heater 3 is connected with the water inlet of the drain tank 4 through a seventh pipeline 30, a third valve 16 and an eighth pipeline 31, a liquid level meter 23 is arranged on the drain tank 4, the water outlet of the drain tank 4 is respectively connected with the water inlets of the first drain pump 5 and the second drain pump 6 through a ninth pipeline 32 and a tenth pipeline 33, a fourth valve 17 and a fifth valve 18 are respectively arranged on the ninth pipeline 32 and the tenth pipeline 33, the water outlet of the first drain pump 5 is connected with a thirteenth pipeline 36 through an eleventh pipeline 34, the water outlet of the second drainage pump 6 is connected with a thirteenth pipeline 36 through a twelfth pipeline 35, and a sixth valve 19 and a seventh valve 20 are respectively arranged on the eleventh pipeline 34 and the twelfth pipeline 35; the thirteenth pipeline 36 is connected with a twentieth pipeline 43 through the third flow meter 11, the twentieth pipeline 43 is divided into two paths, one path is connected with the first deaerator 7 through a fourteenth pipeline 37, the eighth valve 21, the fifteenth pipeline 38, the fourth flow meter 12 and the sixteenth pipeline 39, and the other path is connected with the second deaerator 8 through a seventeenth pipeline 40, the ninth valve 22, the eighteenth pipeline 41, the fifth flow meter 13 and the nineteenth pipeline 42.

In this embodiment, the heat supply extraction steam flows of the first turbine 1 and the second turbine 2 are controlled and adjusted by the first valve 14 and the second valve 15, respectively, and the drain flows into the first deaerator 7 and the second deaerator 8 are controlled and adjusted by the eighth valve 21 and the ninth valve 22, respectively.

In the present embodiment, the drive motors of the first and second drain pumps 5 and 6 have a variable frequency function, and the frequency or current magnitude thereof is associated with the indication of the level gauge 23, and when the indication of the level gauge 23 becomes large (or small), the frequency or current also increases (or decreases).

In the present embodiment, the first valve 14, the second valve 15, the eighth valve 21, and the ninth valve 22 each have a regulating and stopping function.

In the present embodiment, the first flowmeter 9, the second flowmeter 10, the third flowmeter 11, the fourth flowmeter 12, the fifth flowmeter 13, and the liquid level meter 23 all have a remote transmission function.

The working principle is as follows:

under the condition that the first valve 14 and the second valve 15 are fully opened, the heat supply quantity of the unit is strongly related to the power generation load, the regulation of the heat supply quantity to the outside can be realized by controlling and regulating the first valve 14 and the second valve 15, and the regulation of the corresponding drainage flow can be realized by controlling and regulating the eighth valve 21 and the ninth valve 22. In the actual unit to supply heat to the outside, the heat supply steam extraction amount is controlled and adjusted according to the requirement of the outside on heat load.

During operation, the first flowmeter 9, the second flowmeter 10, the third flowmeter 11, the fourth flowmeter 12 and the fifth flowmeter 13 are respectively assumed to have the indication number Q₁、Q₂、Q₃、Q₄And Q₅Which have the same dimension, considering the case of maintaining the value displayed by the liquid level meter 23 constant by controlling and adjusting the first and second drain pumps 5 and 6, the total amount of drainage should be theoretically equal to the total amount of extracted steam, i.e., Q₃＝Q₁+Q₂The total flow rate of the main drain pipe is equal to the sum of the flow rates of the branch drain pipes, i.e. Q₃＝Q₄+Q₅However, in the actual operation process, the steam flow is not well measured, the data measured by the flow meter is not the real flow value, and the measured value is often larger than the actual value, which brings difficulty to the actual hydrophobic flow control. The opening degree of the eighth valve 21 is controlled and adjusted to make the display value of the fourth flowmeter 12

The opening degree of the ninth valve 22 is controlled and adjusted to enable the display value of the fifth flowmeter 13

And establishing a relation between the flow and the valve opening according to the existing valve flow characteristic function, and automatically adjusting the opening of the corresponding valve through the measured flow so as to realize the self-adjusting function.

In particular, when the first turbine 1 is not supplying heat externally, i.e. Q₁ Fourth flowmeter 12 displays value Q when equal to 0₄When the opening degree of the corresponding valve is 0, the system automatically adjusts the opening degree of the corresponding valve to be zero; similarly, when the second turbine 2 is not supplying heat externally, i.e. Q₂The fifth flowmeter 13 displays the value Q when equal to 0₅And (5) when the opening degree of the corresponding valve is 0, the system automatically adjusts the opening degree of the corresponding valve to be zero.

Those not described in detail in this specification are well within the skill of the art.

In addition, it should be noted that the above contents described in the present specification are only illustrations of the structures of the present invention. All equivalent variations of the structures, features and principles described in accordance with the present inventive concepts are included within the scope of the present invention. Those skilled in the art to which the utility model relates will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the utility model as disclosed in the accompanying claims.

Claims

1. A self-adjusting system for reasonably distributing drainage of a heat supply network of a multi-heat supply steam extraction unit is characterized by comprising a first steam turbine (1), a second steam turbine (2), a heat supply network heater (3), a drainage box (4), a first drainage pump (5), a second drainage pump (6), a first deaerator (7) and a second deaerator (8); the heat supply steam extraction port of the first steam turbine (1) is connected with the heat supply network heater (3) through a first pipeline (24), a first flow meter (9), a second pipeline (25), a first valve (14) and a third pipeline (26), the heat supply steam extraction port of the second steam turbine (2) is connected with the heat supply network heater (3) through a sixth pipeline (29), a second flow meter (10), a fifth pipeline (28), a second valve (15) and a fourth pipeline (27), the drain port of the heat supply network heater (3) is connected with the water inlet of the drain box (4) through a seventh pipeline (30), a third valve (16) and an eighth pipeline (31), a liquid level meter (23) is installed on the drain box (4), the water outlet of the drain box (4) is respectively connected with the water inlets of the first drain pump (5) and the second drain pump (6) through a ninth pipeline (32) and a tenth pipeline (33), a fourth valve (17) and a fifth valve (18) are respectively arranged on the ninth pipeline (32) and the tenth pipeline (33), the water outlet of the first drain pump (5) is connected with the thirteenth pipeline (36) through the eleventh pipeline (34), the water outlet of the second drain pump (6) is connected with the thirteenth pipeline (36) through the twelfth pipeline (35), and the eleventh pipeline (34) and the twelfth pipeline (35) are respectively provided with a sixth valve (19) and a seventh valve (20); the thirteenth pipeline (36) is connected with a twentieth pipeline (43) through a third flow meter (11), the twentieth pipeline (43) is divided into two paths, one path is connected with the first deaerator (7) through a fourteenth pipeline (37), an eighth valve (21), a fifteenth pipeline (38), a fourth flow meter (12) and a sixteenth pipeline (39), and the other path is connected with the second deaerator (8) through a seventeenth pipeline (40), a ninth valve (22), an eighteenth pipeline (41), a fifth flow meter (13) and a nineteenth pipeline (42).