CN212157111U - Thermodynamic system for heating boiler feed water by using low-pressure bypass under deep peak regulation working condition - Google Patents

Thermodynamic system for heating boiler feed water by using low-pressure bypass under deep peak regulation working condition Download PDF

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Publication number
CN212157111U
CN212157111U CN202020868104.5U CN202020868104U CN212157111U CN 212157111 U CN212157111 U CN 212157111U CN 202020868104 U CN202020868104 U CN 202020868104U CN 212157111 U CN212157111 U CN 212157111U
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pressure
steam
pipeline
boiler
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李冰天
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Huazhong Electric Power Test Research Institute China Datang Corp Science and Technology Research Institute
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Huazhong Electric Power Test Research Institute China Datang Corp Science and Technology Research Institute
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Abstract

The utility model relates to a thermodynamic system for heating boiler feed water by using low-pressure bypass under the working condition of deep peak regulation, which adopts the technical proposal that a water inlet of an external steam cooler is connected with a water outlet of a high-pressure heater, a water outlet of the external steam cooler is connected with a water inlet of a boiler, a first steam heating circulation pipeline communicated with a low-pressure bypass pipeline is connected on an air inlet of the external steam cooler, a second steam heating circulation pipeline communicated with the low-pressure bypass pipeline is connected on an air outlet of the external steam cooler, and the terminal point of the second steam heating circulation pipeline is positioned between the starting point of the first steam heating circulation pipeline and a low-pressure bypass regulating valve, therefore, the utility model opens the low-pressure bypass under the working condition of deep peak regulation, improves the steam inlet quantity of the boiler, ensures the stable combustion of the boiler, and is provided with the external steam cooler, utilize low pressure bypass steam heating feedwater, improve boiler entry temperature, improve denitration efficiency.

Description

Thermodynamic system for heating boiler feed water by using low-pressure bypass under deep peak regulation working condition
Technical Field
The utility model relates to a thermodynamic system of power plant, especially a thermodynamic system of utilizing low pressure bypass to heat boiler feed water under degree of depth peak regulation operating mode.
Background
With the continuous improvement of the installed capacity of new energy, the load rate of the thermal power generating unit is gradually reduced, the deep peak regulation working condition operation becomes one of the main characteristics of the operation of the thermal power generating unit at present, in order to improve the enthusiasm of the thermal power generating unit for participating in the deep peak regulation, a deep peak regulation auxiliary service market trading rule is continuously provided for each province, and under the rule, more peak regulation compensation can be obtained when the time for a power generating enterprise to participate in the deep peak regulation is longer and the load is lower.
However, after the unit participates in the deep peak shaving, the load is low, the stable combustion pressure of the boiler is high, in order to ensure that the unit cannot be stopped due to the participation in the deep peak shaving, the unit mostly adopts modes of oil feeding, steam turbine bypass opening and the like to stabilize the combustion of the boiler, and although the mode can ensure the stable combustion of the boiler, the economical efficiency is reduced greatly; in addition, the lower load leads to the exhaust gas temperature to drop, and denitration equipment efficiency descends, and nitrogen oxide risees, has brought new pressure for unit environmental protection index. Therefore, improvement and innovation thereof are imperative.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned condition, for overcoming prior art not enough, the utility model aims at providing an utilize thermodynamic system of low pressure bypass heating boiler feedwater under the degree of depth peak regulation operating mode, can effectively solve the problem that improves boiler feedwater temperature and improve denitration efficiency.
The utility model provides a technical scheme be:
a thermodynamic system for heating boiler feed water by using a low-pressure bypass under a deep peak regulation working condition comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a low-pressure heater, a deaerator and a high-pressure heater, wherein a steam outlet of the boiler is connected with an air inlet of the high-pressure cylinder; the gas outlet of the low pressure cylinder is connected with the gas inlet of a condenser, and the liquid outlet of the condenser is connected with the liquid inlet of a boiler through a low pressure heater, a deaerator and a high pressure heater which are connected in series to form a heating water circulation structure of steam; the reheating circulation pipeline between the boiler and the intermediate pressure cylinder is connected with a low-pressure bypass pipeline connected with an air inlet of a condenser, the low-pressure bypass pipeline is provided with a low-pressure bypass adjusting valve and a temperature and pressure reducing valve which are sequentially connected in series, the thermodynamic system further comprises an external steam cooler arranged on a pipeline between the high-pressure heater and the boiler, a water inlet of the external steam cooler is connected with a water outlet of the high-pressure heater, a water outlet of the external steam cooler is connected with a liquid inlet of the boiler, an air inlet of the external steam cooler is connected with a first steam heating circulation pipeline communicated with the low-pressure bypass pipeline, a gas outlet of the external steam cooler is connected with a second steam heating circulation pipeline communicated with the low-pressure bypass pipeline, and an end point (a connection point of the second steam heating circulation pipeline and the low-pressure bypass pipeline) of the second steam heating circulation pipeline is positioned at a starting point of the first steam heating circulation pipeline (the The connection point of the bypass pipeline) and the low-pressure bypass adjusting door to form a steam type heat exchange temperature rising structure for supplying water to the water outlet of the high-pressure heater.
Preferably, a pneumatic adjusting door, a manual adjusting door and an electric adjusting door which are connected in series are sequentially arranged on a first steam heating circulating pipeline between the external steam cooler and the low-pressure bypass pipeline.
Preferably, an electric isolation door and a manual isolation door which are connected in series are sequentially arranged on a second steam heating circulating pipeline between the external steam cooler and the low-pressure bypass pipeline.
The utility model discloses novel structure is unique, and is simple reasonable, reform transform on original power plant thermodynamic system's basis, add external steam cooler and the pipeline that corresponds, the valve can, open the low pressure bypass under the degree of depth peak regulation operating mode, improve the boiler steam admission, guarantee on the basis that the boiler surely fires, owing to at the newly-increased external steam cooler of water supply line, utilize low pressure bypass steam heating to give water, improve boiler entry temperature, can improve the economic nature on the one hand, on the other hand can improve the flue gas temperature of denitration device entry, improve denitration efficiency, high durability and convenient use, and high effects, and good society and economic benefits are obtained.
Drawings
Fig. 1 is a schematic diagram of the frame connection of the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
Given by figure 1, the utility model discloses a boiler 16, high-pressure cylinder 1, intermediate pressure cylinder 2, low-pressure cylinder 3, condenser 4, low pressure heater 6, deaerator 7 and high pressure heater 9, the steam outlet of boiler 16 links to each other with the air inlet of high-pressure cylinder 1, be equipped with on the gas outlet of high-pressure cylinder 1 and stretch into the reheat circulating line with in the boiler, reheat circulating line's the end of giving vent to anger links to each other with the air inlet of intermediate pressure cylinder 2, the gas outlet of intermediate pressure cylinder 2 links to each other with the air inlet of low-pressure cylinder 3, constitute the multistage steam acting power output structure that has the function of circulation reheat; the gas outlet of the low pressure cylinder 3 is connected with the gas inlet of a condenser 4, the liquid outlet of the condenser 4 is connected with the liquid inlet of a boiler 16 through a low pressure heater 6, a deaerator 7 and a high pressure heater 9 which are connected in series, and a heating water circulation structure of steam is formed; a low-pressure bypass pipeline 19 connected with an air inlet of the condenser 4 is connected on a reheating circulating pipeline between the boiler and the intermediate pressure cylinder, a low-pressure bypass adjusting valve 17 and a temperature and pressure reducing valve 18 which are sequentially connected in series are arranged on the low-pressure bypass pipeline 19, the thermodynamic system also comprises an external steam cooler 10 arranged on a pipeline between the high-pressure heater 9 and the boiler 16, a water inlet of the external steam cooler 10 is connected with a water outlet of the high-pressure heater 9, a water outlet of the external steam cooler 10 is connected with a liquid inlet of the boiler 16, a first steam heating circulating pipeline 20a communicated with the low-pressure bypass pipeline 19 is connected on an air inlet of the external steam cooler 10, a second steam heating circulating pipeline 20b communicated with the low-pressure bypass pipeline 19 is connected on an air outlet of the external steam cooler 10, and the terminal point (the connection point of the second steam heating circulating pipeline 20b and the low-pressure bypass pipeline) is positioned on the first steam heating circulating pipeline And a steam type heat exchange temperature rising structure for supplying water to a water outlet of the high-pressure heater is formed between the starting point of the heat circulation pipeline (the connecting point of the first steam heating circulation pipeline and the low-pressure bypass pipeline) and the low-pressure bypass adjusting door 17.
The external steam cooler is in the prior art, the internal part of the external steam cooler comprises a water passing channel and a gas passing channel, the two channels of media exchange heat through contact, and the external steam cooler is in the prior art, such as a steam cooler (steam condenser) with model number ZL-580 produced by Orient electric group Orient boiler GmbH.
In order to ensure the using effect, a pneumatic adjusting door 13, a manual adjusting door 14 and an electric adjusting door 15 which are connected in series are sequentially arranged on a first steam heating circulating pipeline 20a between the external steam cooler 10 and the low-pressure bypass pipeline 19; an electric isolating door 11 and a manual isolating door 12 which are connected in series are sequentially arranged on a second steam heating circulating pipeline 20b between the external steam cooler 10 and the low-pressure bypass pipeline 19.
A condensate pump 5 is arranged between the condenser 4 and the low-pressure heater 6; and a water feeding pump 8 is arranged between the deaerator 7 and the high-pressure heater 9.
As shown in figure 1, the low-pressure heater 6 has 4 groups, which are respectively a first low-pressure heater 61, a second low-pressure heater 62, a third low-pressure heater 63 and a fourth low-pressure heater 64, the air outlet of the low-pressure cylinder is respectively connected with the air inlets of the 4 groups of low-pressure heaters, the air outlet of the fourth low-pressure heater 64 is connected with the air inlet of the third low-pressure heater 63, the air outlet of the third low-pressure heater 63 is connected with the air inlet of the second low-pressure heater 62, the air outlet of the second low-pressure heater 62 is connected with the air inlet of the first low-pressure heater 61, the air outlet of the first low-pressure heater 61 is connected with the air inlet of the condenser 4, the liquid outlet of the condenser 4 is connected with the water inlet of the first low-pressure heater 61 through a condensate pump 5, and the water outlets of the first low-pressure heater 61, the second low-pressure heater, The water inlets are sequentially connected end to end, the water outlet of the fourth low-pressure heater 64 is connected with the water inlet of the deaerator 7, and the condensed water is heated by the steam of the low-pressure cylinder.
As shown in FIG. 1, the high pressure heaters 9 have 3 groups, which are respectively a first high pressure heater 91, a second high pressure heater 92 and a third high pressure heater 93, the air outlet of the high pressure cylinder is respectively connected with the air inlets of the second high pressure heater 92 and the third high pressure heater 93, the air outlet of the intermediate pressure cylinder is connected with the air inlet of the first high pressure heater 91, the air outlet of the third high pressure heater 93 is connected with the air inlet of the second high pressure heater 92, the air outlet of the second high pressure heater 92 is connected with the air inlet of the first high pressure heater 91, the air outlet of the first high pressure heater 91 is connected with the air inlet of the deaerator 7, the air outlet of the intermediate pressure cylinder is connected with the air inlet of the deaerator, the water outlet of the deaerator 7 is connected with the water inlet of the first high pressure heater 91, the water outlets of the first high pressure heater 91, the second high, The water inlets are sequentially connected end to end, the water outlet of the third high-pressure heater 93 is connected with the water inlet of the external steam cooler 10, and the condensed water is further heated by the steam of the high-pressure cylinder and the intermediate-pressure cylinder.
The utility model has the advantages that when the unit participates in deep peak shaving, when the load is reduced below the lowest stable combustion load of the boiler, firstly, the low-pressure bypass pneumatic valve 17 on the low-pressure bypass pipeline 19 is opened to improve the steam flow of the boiler, then the electric regulating valve and the manual regulating valve on the first steam heating circulation pipeline on the air inlet of the external steam cooler and the electric isolating valve 11 and the manual isolating valve 12 on the second steam heating circulation pipeline are opened, the pneumatic regulating valve 13 on the steam inlet side of the external steam cooler is opened according to the opening degree and the opening mode of the low-pressure bypass regulating valve, the reheated steam in the reheating circulation pipeline enters the low-pressure bypass pipeline, then enters the external steam cooler 10 through the first steam heating circulation pipeline to exchange heat with the water on the outlet side of the high-pressure heater, and then returns to the low-pressure bypass pipeline through the second steam heating circulation pipeline again, the water supply at the water outlet of the high-pressure heater 9 is heated by the steam on the low-pressure bypass pipeline 19 through the heat exchange of the external steam cooler, so that the water temperature at the inlet of the boiler economizer is increased. When the unit quits the deep peak shaving, the low-pressure bypass adjusting door 17, the electric adjusting door and the electric isolating door on the inlet and the outlet of the external steam cooler are closed, and the external steam cooler quits the operation. Compared with the prior art, the utility model has the advantages of it is following:
(1) the low-pressure bypass adjusting door is opened, and the boiler feed water is heated by using low-pressure bypass steam, compared with the original thermodynamic system (lacking an external steam cooler), the feed water temperature can be increased by more than 10 ℃ under the deep peak regulation working condition, the coal consumption is reduced, and the lower the boiler load is, the larger the corresponding bypass adjusting door can be opened, and the more the coal consumption is reduced.
(2) After the feed water temperature of the boiler is improved, the flue gas temperature of the tail flue of the boiler can be correspondingly improved, and the denitration efficiency is improved.

Claims (5)

1. A thermodynamic system for heating boiler feed water by using a low-pressure bypass under a deep peak regulation working condition comprises a boiler (16), a high-pressure cylinder (1), an intermediate-pressure cylinder (2), a low-pressure cylinder (3), a condenser (4), a low-pressure heater (6), a deaerator (7) and a high-pressure heater (9), wherein a steam outlet of the boiler (16) is connected with an air inlet of the high-pressure cylinder (1), a reheating circulating pipeline extending into the boiler is arranged on an air outlet of the high-pressure cylinder (1), an air outlet end of the reheating circulating pipeline is connected with an air inlet of the intermediate-pressure cylinder (2), an air outlet of the intermediate-pressure cylinder (2) is connected with an air inlet of the low-pressure cylinder (3), and a multistage steam work-doing power output structure with a circulating reheating; an air outlet of the low pressure cylinder (3) is connected with an air inlet of a condenser (4), and a liquid outlet of the condenser (4) is connected with a liquid inlet of a boiler (16) through a low pressure heater (6), a deaerator (7) and a high pressure heater (9) which are connected in series to form a heating water circulation structure of steam; a low-pressure bypass pipeline (19) connected with an air inlet of a condenser (4) is connected on a reheating circulating pipeline between the boiler and the intermediate pressure cylinder, a low-pressure bypass adjusting valve (17) and a temperature and pressure reducing valve (18) which are sequentially connected in series are arranged on the low-pressure bypass pipeline (19), the thermodynamic system is characterized by further comprising an external steam cooler (10) arranged on a pipeline between the high-pressure heater (9) and the boiler (16), a water inlet of the external steam cooler (10) is connected with a water outlet of the high-pressure heater (9), a water outlet of the external steam cooler (10) is connected with an liquid inlet of the boiler (16), a first steam heating circulating pipeline (20a) communicated with the low-pressure bypass pipeline (19) is connected on the air inlet of the external steam cooler (10), a second steam heating circulating pipeline (20b) communicated with the low-pressure bypass pipeline (19) is connected on a gas outlet of the external steam cooler (10), the end point of the second steam heating circulating pipeline (20b) is positioned between the starting point of the first steam heating circulating pipeline and the low-pressure bypass adjusting door (17), and a steam type heat exchange temperature rising structure for supplying water to a water outlet of the high-pressure heater is formed.
2. The thermodynamic system for heating boiler feed water by using a low-pressure bypass under deep peak shaving conditions according to claim 1, wherein a pneumatic adjusting door (13), a manual adjusting door (14) and an electric adjusting door (15) which are connected in series are sequentially arranged on a first steam heating circulation pipeline (20a) between the external steam cooler (10) and the low-pressure bypass pipeline (19).
3. The thermodynamic system for heating boiler feed water by using a low-pressure bypass under deep peak shaving conditions according to claim 1 or 2, wherein an electric isolation door (11) and a manual isolation door (12) which are connected in series are sequentially arranged on the second steam heating circulation pipeline (20b) between the external steam cooler (10) and the low-pressure bypass pipeline (19).
4. The thermodynamic system for heating boiler feed water by using a low-pressure bypass under deep peak shaving conditions according to claim 1, wherein a condensate pump (5) is arranged between the condenser (4) and the low-pressure heater (6).
5. The thermodynamic system for heating boiler feed water by means of a low-pressure bypass under deep peak shaving conditions according to claim 1, wherein a feed water pump (8) is arranged between the deaerator (7) and the high-pressure heater (9).
CN202020868104.5U 2020-05-21 2020-05-21 Thermodynamic system for heating boiler feed water by using low-pressure bypass under deep peak regulation working condition Active CN212157111U (en)

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CN202020868104.5U CN212157111U (en) 2020-05-21 2020-05-21 Thermodynamic system for heating boiler feed water by using low-pressure bypass under deep peak regulation working condition

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Application Number Priority Date Filing Date Title
CN202020868104.5U CN212157111U (en) 2020-05-21 2020-05-21 Thermodynamic system for heating boiler feed water by using low-pressure bypass under deep peak regulation working condition

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