CN213450529U - Multi-source stable industrial steam supply system with reliability and economy - Google Patents
Multi-source stable industrial steam supply system with reliability and economy Download PDFInfo
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- CN213450529U CN213450529U CN202022424083.0U CN202022424083U CN213450529U CN 213450529 U CN213450529 U CN 213450529U CN 202022424083 U CN202022424083 U CN 202022424083U CN 213450529 U CN213450529 U CN 213450529U
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Abstract
The utility model discloses a multisource stable industrial steam supply system with reliability and economy, which comprises a coal-fired generator set, a main steam extraction temperature and pressure reduction valve set, a reheated steam temperature and pressure reduction valve set and a steam boiler; the inlet end of the main steam extraction temperature and pressure reduction valve set is connected with a main steam pipeline between a boiler and a high-pressure cylinder in the coal-fired power generating set, and the outlet end of the main steam extraction temperature and pressure reduction valve set is communicated with an external industrial steam supply main pipe; the inlet end of the reheat steam temperature and pressure reducing valve set is connected with a reheat steam pipeline between a boiler reheater and a medium pressure cylinder in the coal-fired power generating set, and the outlet end of the reheat steam temperature and pressure reducing valve set is communicated with an external industrial steam supply main pipe; the outlet steam of the steam boiler is communicated with an external industrial steam supply main pipe after passing through the saturated steam electric heater. The utility model discloses compromise the multisource of heat supply reliability and economic nature and stabilize industry steam supply system and method, increased industry steam supply system's reliable and stable nature, provided the air feed mode switching method under different electric power and the industry steam supply flow simultaneously, compromise whole economic nature.
Description
[ technical field ] A method for producing a semiconductor device
The utility model belongs to industry supplies vapour field, relates to an industry supplies vapour system and method, especially a compromise industry vapour system is stabilized to multisource of reliability and economic nature.
[ background of the invention ]
With the social development and the continuous adjustment of industrial structures, the power utilization structure changes continuously, the power system faces the increasingly aggravated peak regulation problem, and the deficiency of the peak regulation capability of the system becomes an important factor for restricting the power development. The power supply is larger than the demand, the installed capacity of wind energy, solar energy and hydroenergy power is greatly improved, the peak-to-valley difference of the power load of the power grid is increased, the external power input is continuously increased and the like, so that the peak load regulation of the power grid is difficult, and the new energy power rejection phenomenon is frequent.
The coal-fired generating set is improved through the technology, extracts steam at a certain position of steam-water thermodynamic cycle for external supply, meets the production requirement of external steam consumption, supplies heat to the external centralized industry through the high-efficiency and environment-friendly large-capacity coal-fired generating set, replaces a coal-fired and oil-fired small boiler with heavy pollution and high energy consumption, reduces the steam consumption cost of enterprises, and is favorable for reducing the emission of regional atmospheric pollutants.
The industrial steam supply technology of the coal-fired power generating set is various, and the technology optimization is carried out on the principle of 'temperature to port, pressure matching and cascade utilization'. Wherein the steam supply pressure is 1.6-3 MPa, and the heat readjustable steam extraction technology based on the intermediate connection door parameter adjustment is selected more. According to the technology, when the coal-fired generator set is low in electric power, the steam inlet regulating valve opening of the intermediate pressure cylinder is closed to lift the hot steam pressure so as to meet the requirements of users, and the problems of large throttling loss, poor heat supply economy and the like exist; meanwhile, there is a problem in that the steam supply capacity sharply decreases as the electric power decreases. Therefore, during the deep peak regulation period of the power grid, the industrial heating capacity can not meet the requirement of a heat user, the heating mode is single, the safety and reliability are poor, and the economy is low. At present, no stable industrial heat supply method which has both reliability and economy is available.
[ Utility model ] content
The utility model aims to solve current coal-fired generating set industry and supply vapour technique, lack the problem of the stable industry heat supply method who compromises reliability and economic nature, provide a compromise the stable industry of multisource of reliability and economic nature and supply vapour system.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a multi-source stable industrial steam supply system with reliability and economy, which comprises a coal-fired generator set, a main steam extraction temperature and pressure reduction valve set, a reheated steam temperature and pressure reduction valve set and a steam boiler;
the exhaust steam of a low-pressure cylinder in the coal-fired power generating unit is introduced into a condenser, enters a low-pressure heater group through a condensate pump, enters a high-pressure heater group through a feed pump group, and then returns to the boiler;
the inlet end of the main steam extraction temperature and pressure reduction valve set is connected with a main steam pipeline between a boiler and a high-pressure cylinder in the coal-fired power generating set, and the outlet end of the main steam extraction temperature and pressure reduction valve set is communicated with an external industrial steam supply main pipe;
the inlet end of the reheat steam temperature and pressure reducing valve set is connected with a reheat steam pipeline between a boiler reheater and a medium pressure cylinder in the coal-fired power generating set, and the outlet end of the reheat steam temperature and pressure reducing valve set is communicated with an external industrial steam supply main pipe; a middle pressure cylinder steam inlet adjusting valve group is arranged in front of the inlet end of a middle pressure cylinder of the coal-fired power generating unit;
the temperature-reducing water sources of the main steam extraction temperature-reducing pressure-reducing valve group and the reheat steam temperature-reducing pressure-reducing valve group are both taken from the outlets of the water-feeding pump groups;
the high-temperature high-pressure feed water of the steam boiler is taken from the outlet of the high-pressure heater group, and the outlet steam of the steam boiler is communicated with an external industrial steam supply main pipe after passing through the saturated steam electric heater.
The utility model discloses further improvement lies in:
the steam boiler is an electrode type steam boiler.
The heat source of the steam boiler is the heat source which is transmitted by a high-voltage cable after the outlet of a generator in the coal-fired generator set is regulated by a transformer.
The main steam extraction temperature and pressure reduction valve set is arranged on a temperature reduction water source flow from an outlet of the water supply pump set through a pipeline.
And the reheat steam temperature and pressure reducing valve group is arranged on a pipeline of a temperature reducing water source flow from an outlet of the water supply pump group.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses compromise industry steam supply system and method are stabilized to multisource of heat supply reliability and economic nature, for satisfying about 1.5 ~ 3MPa, the industry steam supply demand of variable flow, on the basis of the heat of participating transferring in the antithetical couplet is adjustable steam extraction technique again, main steam extraction and two kinds of steam boiler steam supply techniques have been increased, under the dual scheduling environment of complicated changeable electric wire netting and hot user demand, the reliable and stable nature of industry steam supply system has been increased, the air feed mode switching method under different electric power rates and the industry steam supply flow has been provided simultaneously, whole economic nature has been taken into account.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is the schematic diagram of the utility model discloses industry steam supply system embodiment is stabilized to multisource.
Wherein: 1-boiler, 2-high pressure cylinder, 3-intermediate pressure cylinder, 4-low pressure cylinder, 5-generator, 6-condenser, 7-condensate pump, 8-low pressure heater group, 9-feed water pump group, 10-high pressure heater group, 11-intermediate pressure cylinder steam inlet regulating valve group, 12-reheat steam temperature and pressure reducing valve group, 13-main steam extraction temperature and pressure reducing valve group, 14-main steam extraction temperature and pressure reducing valve group, 15-reheat steam temperature and pressure reducing valve group, 16-high temperature feed water valve group, 17-steam boiler, 18-saturated steam electric heater, 19-transformer.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the utility model arranges a tee joint at the reheat steam main pipe in front of the medium pressure cylinder steam inlet regulating valve group 11, part of reheat steam is guided to the whole plant industrial steam supply main pipe after being regulated by the temperature and pressure reducing valve group 12, the heat reheat steam pressure is larger than the heat user demand pressure when the coal-fired generator set is in high load, the heat reheat steam needs to be reduced in pressure and reduced in temperature at the same time, the medium pressure cylinder steam inlet regulating valve group 11 does not need to participate in regulation, and keeps fully open; the hot vapor pressure is lower than the pressure required by a hot user at the low load, the steam inlet adjusting valve group 11 of the intermediate pressure cylinder participates in adjustment, the opening is closed to raise the hot vapor pressure, and at the moment, the hot vapor extraction only needs to be cooled. The desuperheated water is taken from the feed water at the outlet of the feed water pump set 9. Because the condensed water of the industrial steam supply is not recycled, desalted water with the same industrial steam supply amount is supplemented to the condenser to maintain the steam-water quality balance of the coal-fired power generating set.
When no external heat supply is carried out, the coal-fired generating set is kept running in a pure condensation state. Steam at the outlet of the boiler 1 is heated for the second time in the boiler 1 after being acted by the high-pressure cylinder 2, new steam enters the middle-pressure cylinder 3 to act, exhaust steam enters the low-pressure cylinder 4, and the three cylinders coaxially drive the generator 5 to generate power. After entering a condenser 6 for condensation, the low-pressure cylinder 4 exhausts steam, and then enters the boiler 1 after being heated and pressurized by a condensate pump 7, a low-pressure heater group 8, a feed pump 9 and a high-pressure heater group 10 in sequence, so that steam-water circulation is completed.
The main steam pipeline is provided with a tee joint, and part of main steam is guided to a whole plant industrial steam supply main pipe after being regulated by a temperature and pressure reducing valve group 13.
A steam boiler 17 is arranged in a coal-fired power plant, high-temperature water at an inlet is heated by utilizing electric energy, steam in a high-pressure and saturated state is arranged at an outlet, in order to avoid water hammer risk caused by water in steam in a steam pipeline and meet the requirement of a user on the superheat degree of the steam, a saturated steam electric heater 18 is arranged at an outlet steam pipeline of the steam boiler 17, and the saturated steam is heated to be in a superheated state by adopting the electric energy and then is converged into a whole plant industrial steam supply main pipe.
In conclusion, the coal-fired generating set has three industrial steam supply modes, and the safety and reliability of industrial steam supply are greatly improved.
Mode 1: the heat re-extraction steam based on the adjustment of the steam inlet adjusting valve group 11 of the intermediate pressure cylinder is subjected to temperature and pressure reduction through the temperature and pressure reducing valve group 12 and then is converged into a steam supply main pipe of the whole plant industry, the temperature reducing water is provided by the water supply at the outlet of the water supply pump group 9, and the valve group 15 is opened.
Mode 2: the main steam is extracted, a tee joint is arranged at an outlet of the boiler 1 and a main steam pipeline before the steam enters the high-pressure cylinder 2, the extracted steam is subjected to temperature and pressure reduction through a temperature and pressure reduction valve group 13 and then is converged into a whole plant industrial steam supply main pipe, temperature reduction water is supplied by water supply at an outlet of a water supply pump group 9, and a valve group 14 is opened.
Mode 3: the steam boiler 17 supplies steam, electric energy of the outlet of the generator 5 regulated by a transformer is used as a heat source, a tee joint is arranged on a water supply main pipe at the outlet of the high-pressure heater group 10, part of high-temperature high-pressure water is led to the steam boiler 17 to absorb heat and change phase, the outlet is saturated steam, and the pressure of the saturated steam is adjusted through a valve group 16 and a water side flow in the steam boiler 17 so as to meet the pressure requirement of a user on industrial steam. In order to avoid the risk of water hammer caused by water in steam in the steam pipeline and meet the requirement of a user on the superheat degree of the steam, a saturated steam electric heater 18 is arranged on an outlet steam pipeline of the steam boiler 17, and the saturated steam is heated into a superheat state by adopting electric energy and then is converged into a whole plant industrial steam supply main pipe.
When either mode fails, the other two modes can still provide stable industrial steam supply.
In addition, the steam supply economy of the three industrial steam supply modes is not the same: according to the hot re-steam extraction scheme based on the parameter adjustment of the intermediate pressure cylinder steam inlet adjusting valve group 11, in a high electric load section of the coal-fired generator set, when the steam supply load reaches the designed steam supply capacity, the heating economy is high, when the steam supply load is low in electric load, the hot re-steam pressure is low, the throttling loss of the intermediate pressure cylinder steam inlet adjusting valve group 11 is increased, the efficiency of the intermediate pressure cylinder 3 is obviously reduced, and the heating economy is greatly reduced. The low-electric load and small-flow industrial steam supply has higher economical efficiency of a main steam extraction mode than a hot re-steam extraction mode based on the adjustment of the intermediate pressure cylinder steam inlet adjusting valve group 11.
The coal-fired power generating set participates in deep peak shaving, when the power generation load is lower than 30% of rated load, the power generating set is influenced by factors such as stable combustion of a boiler, axial thrust balance of a steam turbine and the like, and a hot re-steam extraction scheme and a main steam extraction scheme based on the participation of the intermediate pressure cylinder steam inlet control valve group 11 cannot supply steam to the outside stably. The steam boiler scheme adopts electric energy as a steam supply heat source and is not influenced by the deep peak shaving of a power grid.
From the perspective of safety, reliability, economy and efficiency, the steam supply mode switching can adopt the following strategies:
the electrical load of the coal-fired generator set is higher than 50% of the rated load, and a hot re-steam extraction scheme based on the reference regulation of the medium-pressure cylinder steam inlet regulating valve set 11 is adopted;
30 percent of rated load < electric load of coal-fired generator set <50 percent of rated load, and switching to a main steam extraction scheme;
the electrical load of the coal-fired power generating unit is less than 30 percent of rated load, a heat re-steam extraction scheme and a main steam extraction scheme based on the reference regulation of the intermediate pressure cylinder steam inlet regulating valve group 11 are adopted to stop operation, and the steam supply scheme is switched into a steam boiler steam supply scheme.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a compromise industry steam supply system is stabilized to multisource of reliability and economic nature which characterized in that: comprises a coal-fired power generating set, a main steam extraction temperature and pressure reducing valve set (13), a reheat steam temperature and pressure reducing valve set (12) and a steam boiler (17);
the exhaust steam of a low pressure cylinder (4) in the coal-fired power generating set is introduced into a condenser (6), enters a low pressure heater group (8) through a condensate pump (7), enters a high pressure heater group (10) through a water feed pump group (9), and then returns to the boiler (1);
the inlet end of the main steam extraction temperature and pressure reduction valve set (13) is connected with a main steam pipeline between a boiler (1) and a high-pressure cylinder (2) in the coal-fired power generating set, and the outlet end of the main steam extraction temperature and pressure reduction valve set is communicated with an external industrial steam supply main pipe;
the inlet end of the reheat steam temperature and pressure reducing valve group (12) is connected with a reheat steam pipeline between a reheater of a boiler (1) and an intermediate pressure cylinder (3) in the coal-fired power generating set, and the outlet end of the reheat steam temperature and pressure reducing valve group is communicated with an external industrial steam supply main pipe; a middle pressure cylinder steam inlet adjusting valve group (11) is arranged in front of the inlet end of a middle pressure cylinder (3) of the coal-fired power generating set;
the temperature-reducing water sources of the main steam extraction temperature-reducing pressure-reducing valve group (13) and the reheated steam temperature-reducing pressure-reducing valve group (12) are all taken from the outlet of the water feed pump group (9);
the high-temperature high-pressure feed water of the steam boiler (17) is taken from the outlet of the high-pressure heater group (10), and the outlet steam of the steam boiler (17) is communicated with an external industrial steam supply main pipe after passing through a saturated steam electric heater (18).
2. The reliable and economical multisource stable industrial steam supply system according to claim 1, characterized in that: the steam boiler (17) is an electrode type steam boiler.
3. The reliable and economical multisource stable industrial steam supply system according to claim 2, characterized in that: the heat source of the steam boiler (17) is the heat source which is transmitted by a high-voltage cable (19) after the outlet of a generator (5) in the coal-fired generator set is subjected to voltage regulation by a transformer.
4. A reliable and economical multisource stable industrial steam supply system according to any one of claims 1 to 3, characterized in that: the main steam extraction temperature and pressure reduction valve set (13) is provided with a main steam extraction temperature and pressure reduction valve set (14) on a temperature reduction water source flow which is taken from an outlet of the water supply pump set (9) through a pipeline.
5. The reliable and economical multisource stable industrial steam supply system according to claim 4, characterized in that: and a reheat steam temperature and pressure reducing valve group (15) is arranged on a pipeline of a temperature reducing water source flow taken from an outlet of the water feed pump group (9) of the reheat steam temperature and pressure reducing valve group (12).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114017149A (en) * | 2021-09-18 | 2022-02-08 | 华能国际电力江苏能源开发有限公司南通电厂 | Heat supply steam source matching system and method under deep peak regulation working condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114017149A (en) * | 2021-09-18 | 2022-02-08 | 华能国际电力江苏能源开发有限公司南通电厂 | Heat supply steam source matching system and method under deep peak regulation working condition |
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