CN216974945U - Cooling steam system of condenser condensing air-cooling cylinder cutting unit of water-feeding pump steam turbine - Google Patents

Abstract

The utility model discloses a cooling steam system of a water-feeding pump turbine condenser condensing air-cooling cylinder cutting unit, which comprises: the low pressure jar, low pressure jar pipeline intercommunication has and is used for the refrigerated air cooling island of normal mode, air cooling island exit pipeline intercommunication has the hot-well, the low pressure jar links the bypass condensing system who is used for cutting jar mode condensation, bypass condensing system includes the condenser that sets up with the low pressure jar intercommunication, the condenser with the hot-well is through the setting of condensate trunk line intercommunication, just condenser pipeline intercommunication has the water-feeding pump steam turbine. The utility model discloses a condenser through utilizing the feed pump steam turbine realizes condensing the cooling steam in the low pressure jar when cutting the jar, and the intercommunication pipeline between low pressure jar and feed pump steam turbine condenser supplies the steam in the low pressure jar to get into the feed pump steam turbine condenser and condenses to under the prerequisite that reduces the transformation cost by a wide margin, solved when the zero time of exerting oneself of air cooling unit low pressure jar, low pressure jar cooling steam condensation problem.

Description

Cooling steam system of condenser condensing air-cooling cylinder cutting unit of water-feeding pump steam turbine

Technical Field

The utility model relates to the technical field of cogeneration of coal-fired power generating units, in particular to a cooling steam system of a water-feeding pump steam turbine condenser condensing air-cooling cylinder cutting unit.

Background

In recent years, with continuous and rapid increase of the installed capacity of new energy electric power in China, the layout of electric power production and transmission channels is optimized, and the improvement of new energy consumption and storage capacity is imperative. Thermal power generating units increasingly take on the tasks of flexible operation and large-scale participation in deep peak shaving of the power grid. Especially for the heating unit, the traditional operation mode of 'fixing the power with heat' greatly limits the power output adjusting capability of the thermal power unit, and the practical utility model shows that the contradiction between the peak regulation of the power grid and the heat supply of the thermal power unit is more practical. In this background, the zero output technology of the low-pressure cylinder of the steam turbine is developed.

When the direct air cooling unit is used for zero-output transformation of a low-pressure cylinder, an air cooling island is isolated from running in winter by a method of additionally arranging a tubular condenser and a circulating water pump matched with the tubular condenser. The existing method not only increases the plant power rate, but also has the disadvantages of complex system, large occupied area and increased reconstruction cost. The air cooling unit is usually provided with two steam-driven water feeding pumps and one electric water feeding pump, the water feeding pump turbine mostly adopts an independent condensate system, a condenser, a circulating water pump and a condensate pump are arranged, and circulating water cooling adopts a mechanical ventilation tower or a small natural ventilation cooling tower.

In order to solve the problem of low-pressure cylinder cooling steam condensation when the low-pressure cylinder of the air cooling unit operates with zero output, and simultaneously, in order to save the transformation cost and improve the utilization rate of equipment and space, the condenser of the water-feeding pump steam turbine is used for condensing the cooling steam of the air cooling cylinder cutting unit. The scheme has the advantages of small modification range, low investment cost and high operational reliability, and can reduce the modification cost, improve the utilization rate of equipment and space and facilitate further popularization.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

In order to achieve the purpose, the utility model provides a cooling steam system of a water-feeding pump steam turbine condenser condensing air-cooling cylinder cutting unit, which comprises: the low pressure cylinder, low pressure cylinder pipeline intercommunication has and is used for the refrigerated air cooling island of normal mode, air cooling island outlet pipe intercommunication has the hot-well, the low pressure cylinder even is used for cutting the bypass condensing system of jar mode condensation, bypass condensing system includes the condenser that sets up with the low pressure cylinder intercommunication, the condenser with the hot-well sets up through the condensate trunk line intercommunication, just condenser pipeline intercommunication has the feed pump steam turbine.

The condenser of the water feed pump turbine is used for condensing the cooling steam in the low pressure cylinder during cylinder cutting, the pipeline is communicated between the low pressure cylinder and the condenser of the water feed pump turbine, and the steam in the low pressure cylinder enters the condenser of the water feed pump turbine for condensation, so that the problem of low pressure cylinder cooling steam condensation during zero-output operation of the low pressure cylinder of the air cooling unit is solved on the premise of greatly reducing the reconstruction cost.

Optionally, a steam exhaust isolation valve is arranged on a connecting pipeline between the low-pressure cylinder and the air cooling island.

Furthermore, a bypass isolation valve is arranged on a communication pipeline between the low-pressure cylinder and the condenser.

Further, the feed pump steam turbines are provided with 1-2, and the condensers correspond the feed pump steam turbines one-to-one correspondence intercommunication is provided with the same number.

Furthermore, each condenser is communicated with the condensate main pipeline and is provided with a condensate branch pipeline.

Furthermore, each condensate branch pipeline is provided with a condensate control valve for controlling the on-off of an outlet of a condenser on the condensate branch pipeline.

Furthermore, a condensate pump for pumping water into the hot well is arranged on the condensate main pipeline.

Furthermore, a steam inlet valve for controlling steam inlet quantity is arranged at the steam inlet of the steam turbine of the water feeding pump.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the overall structure of an embodiment of the present invention;

fig. 3 is a schematic overall structure diagram of another embodiment of the present invention.

Description of reference numerals:

1. a low pressure cylinder; 2. an air cooling island; 3. a condenser; 4. a hot well; 5. a condensate main pipe; 6. a feed pump turbine; 7. a steam exhaust isolation valve; 8. a bypass isolation valve; 9. a condensate branch pipeline; 10. a condensate control valve; 11. a condensate pump; 12. an exhaust control valve.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

The utility model provides a cooling steam system of a water-feeding pump steam turbine condenser condensing air-cooling cylinder cutting unit, which is explained in detail with reference to fig. 1.

A cooling steam system of a feed pump steam turbine condenser condensing air-cooled cylinder cutting unit refers to FIG. 1, and comprises: low pressure cylinder 1, 1 pipeline intercommunication of low pressure cylinder have and are used for the refrigerated air cooling island 2 of normal mode, and 2 export pipeline intercommunications in air cooling island have hot-well 4, and 1 intercommunication of low pressure cylinder is used for cutting the bypass condensing system of jar mode condensation, and the bypass condensing system includes condenser 3 with 1 intercommunication setting of low pressure cylinder, and condenser 3 and hot-well 4 set up through 5 intercommunications of condensate trunk line, and 3 pipeline intercommunications of condenser have a water-feeding pump steam turbine 6.

When the low pressure cylinder 1 of the air cooling unit normally works, the steam flow in the low pressure cylinder 1 is large, the low pressure cylinder 1 can enter the air cooling island 2 for condensation, thereby the rapid condensation of the exhausted steam of the low pressure cylinder 1 is met, in order to avoid the normal work of the air cooling unit, the exhausted steam in the low pressure cylinder 1 enters the condenser 3, the condition that the heat load is too high in the condenser 3 is caused to occur, a bypass isolating valve 8 is arranged on a communication pipeline between the low pressure cylinder 1 and the condenser 3, when the air cooling unit is in a normal working state, the bypass isolating valve 8 is closed, the exhausted steam in the low pressure cylinder 1 can be completely condensed in the air cooling island 2, and finally, the condensed water enters the hot well 4.

When the low pressure cylinder 1 of the air cooling unit is in cylinder cutting mode operation, the steam flow in the low pressure cylinder 1 is small, and steam enters the air cooling island 2 in the low pressure cylinder 1, because the steam volume that enters is insufficient, the phenomenon that the air cooling island 2 is frost crack can occur, the steam in the low pressure cylinder 1 needs to be led out of the low pressure cylinder 1 through other modes and condensed. Consequently, be provided with exhaust isolation valve 7 on the connecting tube between low pressure jar 1 and air cooling island 2, when the air cooling unit is in and cuts jar operating mode, close exhaust isolation valve 7, open bypass isolation valve 8, steam in the low pressure jar 1 condenses in passing through bypass isolation valve 8 entering condenser 3, the comdenstion water after the condensation is under condensate pump 11's effect, get into the trunk line and flow to the hot-well 4 along the trunk line, simultaneously because condensate pump 11's effect, can be to the trunk line, produce the pumping action in the condenser 3, further make low flow steam in the low pressure jar 1 get into condenser 3 and condense.

According to the actual air cooling unit condition, feed pump turbine 6 is provided with 1 to 2, and condenser 3 corresponds feed pump turbine 6 one-to-one intercommunication and is provided with the same figure number, in this embodiment, feed pump turbine 6 is provided with two, consequently condenser 3 corresponds feed pump turbine 6 and is provided with two equally, low pressure cylinder 1 all communicates the setting with each condenser 3, and the intercommunication mode of intercommunication pipeline between low pressure cylinder 1 and each condenser 3 divides a plurality of branch exhaust steam pipes that correspond condenser 3 quantity for a main exhaust steam pipe, main exhaust steam pipe communicates with low pressure cylinder 1, every branch exhaust steam pipe communicates the setting with a condenser 3, bypass isolating valve 8 sets up on main exhaust steam pipe. In some embodiments, referring to fig. 2, considering that when the steam flow in the low-pressure cylinder is small, two condensers 3 are not required to perform condensation operation simultaneously, an exhaust control valve 12 for controlling the on-off of a branch exhaust pipeline is arranged on any branch exhaust pipeline, and when the two condensers 3 are not required to perform condensation operation simultaneously, the branch exhaust pipeline where the exhaust control valve 12 is located can be closed by controlling the exhaust control valve 12 to be closed, so that only one condenser 3 performs condensation operation; in other embodiments, referring to fig. 3, a steam discharge control valve 12 is provided on each branch steam discharge pipe, thereby facilitating control of each branch steam discharge pipe.

Furthermore, in order to facilitate the collection of the condensed water in each condenser 3, a condensed water branch pipe 9 is arranged on each condenser 3 and communicated with the condensed water main pipe 5, and further, in order to facilitate the individual management of each condensed water branch pipe 9, a condensed water control valve 10 for controlling the on-off of the outlet of the condenser 3 on each condensed water branch pipe 9 is arranged on each condensed water branch pipe 9. According to the flow of the steam in the low-pressure cylinder and the maximum heat load of the single condenser 3, when the flow of the steam in the low-pressure cylinder is less than or equal to the maximum heat load of the single condenser 3, only a condensate control valve 10 on any one condensate branch pipeline 9 is opened, and only one condenser 3 is connected into the bypass condensing system; when the steam flow in the low-pressure cylinder 1 is greater than the maximum heat load of a single condenser 3, the condensate control valves 10 on the two condensate branch pipelines 9 are opened, and at the moment, the two condensers 3 can be connected into the bypass condensing system, so that the condensing efficiency of the whole bypass condensing system is improved, and the actual heat load of the single condenser 3 is reduced.

Further, considering that the air cooling unit enters the cylinder switching mode to operate when the heat load of the air cooling unit is high, since the condenser 3 is used for condensing the steam discharged from the water supply pump turbine 6 and has a certain heat load, at this time, the steam in the low pressure cylinder 1 enters the condenser 3 at the same time to generate an extra heat load, which may cause a situation that the heat load of the condenser 3 may not meet the requirement, the steam generated in the water supply pump turbine 6 needs to be reduced, so that the condenser 3 can divide more heat loads to meet the condensation of the steam in the low pressure cylinder 1, therefore, an intake valve for controlling the steam intake is arranged at the steam inlet of the water supply pump turbine 6, and when the heat load of the air cooling unit is high and the air cooling unit enters the cylinder switching mode to operate, the reduction of the steam entering the water supply pump turbine 6, that is, also reduces the steam discharged from the water supply pump turbine 6. Further, reducing the steam admission to the feed pump turbine 6 results in insufficient power from the steam feed pump powered by the feed pump turbine 6, and in order to compensate for the insufficient power from the steam feed pump, a standby electric feed pump needs to be started, thereby maintaining the stability of the entire air cooling unit.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. The utility model provides a feed pump steam turbine condenser condensation air cooling cuts jar unit cooling steam system which characterized in that includes: the low pressure cylinder, low pressure cylinder pipeline intercommunication has and is used for the refrigerated air cooling island of normal mode, air cooling island outlet pipe intercommunication has the hot-well, the low pressure cylinder even is used for cutting the bypass condensing system of jar mode condensation, bypass condensing system includes the condenser that sets up with the low pressure cylinder intercommunication, the condenser with the hot-well sets up through the condensate trunk line intercommunication, just condenser pipeline intercommunication has the feed pump steam turbine.

2. The system as claimed in claim 1, wherein a steam exhaust isolation valve is disposed on a connecting pipeline between the low pressure cylinder and the air cooling island.

3. The system as claimed in claim 1, wherein a bypass isolation valve is disposed on a communication pipeline between the low pressure cylinder and the condenser.

4. The cooling steam system of claim 1, wherein the number of the feed pump turbines is 1 to 2, and the number of the condensers is the same as the number of the feed pump turbines in one-to-one correspondence.

5. The cooling steam system of claim 4, wherein each condenser is provided with a condensate branch pipe in communication with the condensate main pipe.

6. The cooling steam system of a feed pump turbine condenser air-cooled cylinder cutting unit as claimed in claim 5, wherein each of the condensate branch pipes is provided with a condensate control valve for controlling on/off of a condenser outlet of the condensate branch pipe.

7. The cooling steam system of the feed pump turbine condenser air-cooled cylinder cutting unit as claimed in claim 1, wherein a condensate pump for pumping water into a hot well is provided on the condensate main pipe.

8. The cooling steam system of the feed pump turbine condenser air-cooled cylinder cutting unit as claimed in claim 1, wherein a steam inlet valve for controlling a steam inlet amount is provided at a steam inlet of the feed pump turbine.

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