CN107559056B - Steam turbine increasing system with AGC function and adjusting method - Google Patents
Steam turbine increasing system with AGC function and adjusting method Download PDFInfo
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Abstract
A turbine increasing system with an AGC function comprises a turbine high-pressure cylinder (1), a turbine medium-pressure cylinder (2), a turbine low-pressure cylinder (3), a high-pressure bypass adjusting system, a medium-pressure bypass adjusting system, a low-pressure bypass adjusting system and a hydraulic load system; the high-pressure bypass regulating system, the medium-pressure bypass regulating system and the low-pressure bypass regulating system are respectively connected to the high-pressure cylinder (1) of the steam turbine, the medium-pressure cylinder (2) of the steam turbine and the low-pressure cylinder (3) of the steam turbine, and independently work for regulating the steam quantity entering each cylinder; each bypass regulating system is also connected to the hydraulic load system, and steam led out by the bypass is utilized to carry out steam-water heat exchange with various hydraulic load components; the adjustable steam turbine is arranged on the bypass, so that the load of the steam turbine is quickly adjusted, the climbing capacity and the response speed of the unit peak regulation are improved, meanwhile, the effect of thermoelectric decoupling is achieved, and the quality of the thermal power unit flexible peak regulation is further improved.
Description
Technical Field
The invention belongs to the field of power plant energy conservation, and particularly relates to a steam turbine increasing system with an AGC function.
Background
In the early stage, due to the lack of electricity in China, the main tasks of the generator set are full-scale power generation and stable power generation. With the development of electric power in China, electricity consumption and power generation are balanced, even the situation of surplus power generation occurs, the amplitude and frequency of power consumption change are increased, a power grid provides higher peak regulation requirements for a generator set for timely balancing the electricity consumption and the power generation, the load value of the generator set can be continuously regulated and adjusted, and the thermal power generating unit is required to have an AGC function.
AGC, (AGC, automatic Generation Control), automatic generation control, whose core goal is "guarantee system frequency is rated". The core technology is 'quick response' and 'climbing speed' during load regulation.
At present, the load change rate of the AGC unit in the power grid is about 1.5% MCR (rated load)/min, and the load response delay is less than 2 minutes. The load regulation speed of the thermal power unit is improved, and the load response delay time is reduced, which is the direction for improving the AGC level of the thermal power unit.
The load adjustment of the thermal power generating unit mainly comprises three directions: 1, the load of the boiler is increased or reduced, and the steam turbine follows, so that the effect of adjusting the power generation load is achieved; 2, under the condition of a certain boiler load, adjusting the load of the steam turbine, thereby achieving the function of adjusting the power generation load; and 3, the loads of the boiler and the steam turbine are regulated, and are increased or reduced, so that the effect of regulating the power generation load is achieved.
For a pure generator set, the electrical load is primarily regulated by the boiler. The turbine is passively followed. The boiler load increases or decreases, increasing or decreasing the amount of steam entering the turbine, thereby increasing or decreasing the turbine output.
For the thermoelectric unit, the thermoelectric unit is a pure generator unit in a non-heating season, and the peak regulation mode of the thermoelectric unit is similar to that of the pure generator unit; when the heat supply season runs, the heat supply requirement is met, the heat supply is a civil rigid task, and the power supply is an elastic task. The load of the boiler and the turbine are regulated, and the load is mainly regulated by the turbine.
Under the condition of a certain boiler load, the aim of adjusting the load of the steam turbine is achieved mainly by regulating the steam inlet quantity of the high, medium and low pressure cylinders through a bypass. And a high-pressure steam bypass is arranged, and the high-pressure steam bypass is opened or closed, so that the steam quantity entering the high-pressure cylinder is reduced or increased, and the output of the high-pressure cylinder is reduced or increased. Short for high side. Setting a medium-pressure steam bypass, opening or closing the medium-pressure steam bypass, reducing or increasing the steam quantity entering the medium-pressure cylinder, and reducing or increasing the output of the medium-pressure cylinder; short for the middle side. The low-pressure steam bypass is arranged, and is opened or closed, so that the steam quantity entering the low-pressure cylinder is reduced or increased, and the output of the low-pressure cylinder is reduced or increased. Short for low side.
When the load adjustment quantity required by the power grid is smaller, only low-side adjustment can be utilized; when the load regulation quantity required by the power grid is moderate, only the middle side regulation can be utilized. The middle side can simultaneously reduce the steam quantity entering the middle pressure cylinder and the low pressure cylinder; when the load regulation quantity of the power grid is relatively large, only high-side regulation can be utilized. The high side can simultaneously reduce the steam quantity entering the high-medium pressure cylinder and the low pressure cylinder; when the load adjustment quantity of the power grid is larger, three bypasses of high, medium and low can be utilized for simultaneous adjustment.
When the steam bypasses, the heat of the steam needs to be sent to a heat supply network heater for heating the heat supply network backwater. The heat supply network water absorbing the bypass heat is sent to a heat storage tank and stored temporarily.
When the bypass is regulated, the response speed of the bypass is dependent on the regulating speed of the bypass steam flow. If the valve is used to control the amount of intake, the valve opening and closing speeds are relatively slow, resulting in a relatively slow AGC response. If a system can be found that is faster than the valve adjustment speed, the AGC response can be improved, thereby improving peak shaving quality.
Disclosure of Invention
The invention aims to provide a power generation load adjusting system with 'quick response', so as to improve the load adjusting speed and solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a turbine increasing system with an AGC function comprises a turbine high-pressure cylinder (1), a turbine medium-pressure cylinder (2), a turbine low-pressure cylinder (3), a high-pressure bypass adjusting system, a medium-pressure bypass adjusting system, a low-pressure bypass adjusting system and a hydraulic load system; the high-pressure bypass regulating system, the medium-pressure bypass regulating system and the low-pressure bypass regulating system are respectively connected to a high-pressure cylinder (1) of the steam turbine, a medium-pressure cylinder (2) of the steam turbine and a low-pressure cylinder (3) of the steam turbine, and independently work for regulating the steam quantity entering each cylinder; the high-pressure bypass regulating system, the medium-pressure bypass regulating system and the low-pressure bypass regulating system are also respectively connected to a hydraulic load system, the hydraulic load system is provided with various hydraulic load components, and steam led out by the bypass is utilized to perform steam-water heat exchange with the various hydraulic load components.
As still further aspects of the invention: the adjusting method of the automobile increasing system with the AGC function comprises the following steps:
a. when the load adjustment quantity required by the power grid is smaller, the load is adjusted only by opening or closing the low-voltage bypass adjustment system; when the low-pressure bypass regulating system operates, heat of the low-pressure bypass regulating system is sent to a heat supply network condenser and a heat supply network heater to heat supply network backwater, and the heat supply network backwater absorbing bypass heat is pumped into a heat storage tank (11) to be temporarily stored and sent to a heat user at proper time;
b. when the load regulation quantity required by the power grid is moderate, the load can be regulated by only opening or closing the medium-voltage bypass regulation system; the medium pressure bypass regulating system can simultaneously reduce the steam amount entering the medium pressure cylinder and the low pressure cylinder; when the solar heat collector operates at the middle side, the heat of the solar heat collector is sent to a heat supply network condenser and a high-parameter heat supply network heater to heat the return water of the heat supply network, and the heat supply network water absorbing the heat of the bypass is pumped into a heat storage tank (11) to be temporarily stored and sent to a heat user at proper time;
c. when the load regulation quantity of the power grid is relatively large, the load can be regulated only by opening or closing the high-voltage bypass regulation system; the high-pressure bypass regulating system can simultaneously reduce the steam quantity entering the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder; when the high-pressure bypass regulating system is started, the load of the power generation device is low, at the moment, the inlet smoke temperature of the denitration device is low, the effect of the SCR device is poor, at the moment, when the high-pressure bypass regulating system is operated at a high side, the heat of the denitration device is sent to a first high-pressure heater, the inlet steam temperature of the first high-pressure heater is increased when the high-pressure bypass regulating system is in a low load, and the water temperature of the first high-pressure heater is increased, so that the temperature of the smoke entering the SCR device is increased, and the denitration effect is improved;
d. when the load adjustment quantity of the power grid is larger, three bypass systems of a high-voltage bypass adjustment system, a medium-voltage bypass adjustment system and a low-voltage bypass adjustment system can be used for simultaneous adjustment.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a steam turbine increasing system with an AGC function, which adopts a steam turbine steam bypass and is provided with three adjusting systems of a high side, a middle side and a low side.
An adjustable gas increasing machine is arranged on the bypass to replace the valve. The opening or closing speed of the adjustable gas increasing machine is less than or equal to 35 seconds and is greatly faster than the opening or closing speed of the valve.
By utilizing the advantage of fast opening or closing speed of the steam turbine, the load of the steam turbine is quickly adjusted, the climbing capacity and the response speed of the unit peak regulation are improved, meanwhile, the effect of thermoelectric decoupling is achieved, and the quality of the thermal power unit flexible peak regulation is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a turbo system with AGC function.
In the figure: the system comprises a 1-turbine high-pressure cylinder, a 2-turbine medium-pressure cylinder, a 3-turbine low-pressure cylinder, a 4-high-side booster, a 5-medium-side booster, a 6-low-side booster, a 7-heat supply network condenser, an 8-heat supply network heater, a 9-high-parameter heat supply network heater, a 10-No. 1 high-pressure heater, a 11-heat storage tank, a 12-turbine medium-pressure cylinder communication pipeline, a 13-high-side power steam interface, a 14-high-side suction steam interface, a 15-turbine first extraction pipeline, a 16-reheater, a 17-high-side booster steam outlet, a 18-medium-side booster power steam interface, a 19-reheater cold end, a 20-reheater hot end, a 21-medium-side booster suction steam interface, a 22-medium-side booster steam outlet, a 23-low-side booster power steam interface, a 24-medium-side booster suction steam interface, a 25-exhaust steam exhaust pipeline, a 26-low-side booster steam outlet, 27-main steam, 28-heat supply return water and 29-heat supply water outlet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, in an embodiment of the present invention, a turbine increasing system with an AGC function includes a turbine high pressure cylinder (1), a turbine middle pressure cylinder (2), a turbine low pressure cylinder (3), a high pressure bypass adjustment system, a middle pressure bypass adjustment system, a low pressure bypass adjustment system, and a hydraulic load system; the high-pressure bypass regulating system, the medium-pressure bypass regulating system and the low-pressure bypass regulating system are respectively connected to the high-pressure cylinder (1) of the steam turbine, the medium-pressure cylinder (2) of the steam turbine and the low-pressure cylinder (3) of the steam turbine, and independently work for regulating the steam quantity entering each cylinder; the high-pressure bypass regulating system, the medium-pressure bypass regulating system and the low-pressure bypass regulating system are also connected to the hydraulic load system, and steam led out by the bypass is utilized to carry out steam-water heat exchange with various hydraulic load components.
The high-pressure bypass regulating system comprises a high-side steam adding machine (4) and a matched pipeline valve, a power steam interface (13) of the high-side steam adding machine (4) is connected with a main steam pipeline, a suction steam interface (14) of the high-side steam adding machine (4) is connected with a first steam extraction pipeline (15) of a steam turbine, and a steam exhaust port (17) of the high-side steam adding machine (4) is connected with a first high-pressure heater (10).
The medium-pressure bypass regulating system comprises a medium-side booster (5) and a matched pipeline valve, wherein a power steam interface (18) of the medium-side booster (5) is connected with a cold end (19) or a hot end (20) of a steam turbine reheater (16), a suction steam interface (21) of the medium-side booster (5) is connected with a medium-pressure cylinder communication pipeline (12) of the steam turbine, and a steam exhaust port (22) of the medium-side booster (5) is connected with a high-parameter heat supply network heater (9).
The low-pressure bypass regulating system comprises a low-side steam adding machine (6) and a matched pipeline valve, a power steam interface (23) connected with the low-side steam adding machine (6) is connected with a medium-pressure cylinder communication pipeline (12), a suction steam interface (24) of the low-side steam adding machine (6) is connected with a steam turbine exhaust steam pipeline (25), and a steam exhaust port (26) of the low-side steam adding machine (6) is connected with a heat supply network condenser (7).
The hydraulic load system is provided with various hydraulic load components, including a heat supply network condenser (7), a heat supply network heater (8), a high-parameter heat supply network heater (9), a first high-pressure heater (10) and a heat storage tank (11). The hydraulic load system formed by various hydraulic load components can reasonably distribute and utilize bypass steam heat during adjustment to a unit or a heating network.
The water inlet of the heat supply network condenser (7) is connected with a heat supply water return pipeline; the water outlet of the heat supply network condenser (7) is connected with the water inlet of the heat supply network heater (8) and the water inlet of the high-parameter heat supply network heater (25); the heat supply network heater (8) is connected with the high-parameter heat supply network heater (25) in parallel; the water outlet of the heat supply network heater (8) and the water outlet of the high-parameter heat supply network heater (25) are connected with the heat storage tank (11); the water outlet of the heat supply network heater (8) and the water outlet of the heat storage tank (11) are connected with a heat supply water outlet pipeline.
The high-side steam turbine (4), the medium-side steam turbine (5) and the low-side steam turbine (6) are all adjustable steam turbines.
The adjusting method of the automobile increasing system with the AGC function comprises the following steps:
a. when the load adjustment quantity required by the power grid is smaller, the load is adjusted only by opening or closing the low-voltage bypass adjustment system; when the low-pressure bypass regulating system operates, heat of the low-pressure bypass regulating system is sent to the heat supply network condenser and the heat supply network heater, heat supply network backwater is heated, heat supply network water absorbing bypass heat is pumped into the heat storage tank (11) and stored temporarily, and the heat supply network water is sent to a heat user when appropriate.
b. When the load regulation quantity required by the power grid is moderate, the load can be regulated by only opening or closing the medium-voltage bypass regulation system; the medium pressure bypass regulating system can simultaneously reduce the steam amount entering the medium pressure cylinder and the low pressure cylinder; when the solar heat storage device runs at the middle side, heat of the solar heat storage device is sent to a heat supply network condenser and a high-parameter heat supply network heater, heat supply network backwater is heated, heat supply network water absorbing bypass heat is pumped into a heat storage tank (11) and stored temporarily, and the heat is sent to a heat user when appropriate.
c. When the load regulation quantity of the power grid is relatively large, the load can be regulated only by opening or closing the high-voltage bypass regulation system; the high-pressure bypass regulating system can simultaneously reduce the steam quantity entering the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder; when the high-pressure bypass regulating system is started, the load of the power generation device is low, at the moment, the inlet smoke temperature of the denitration device is low, the effect of the SCR device is poor, at the moment, when the high-pressure bypass regulating system runs at the high side, the heat of the denitration device is fed to the first high-pressure heating device, the inlet steam temperature of the first high-pressure heating device is improved when the load is low, the water temperature of the inlet coal economizer is improved, the temperature of the smoke entering the SCR device is improved, and the denitration effect is improved.
d. When the load adjustment quantity of the power grid is larger, three bypass systems of a high-voltage bypass adjustment system, a medium-voltage bypass adjustment system and a low-voltage bypass adjustment system can be used for simultaneous adjustment.
Finally, it should be noted that: the foregoing is merely illustrative of the present invention and is not to be construed as limiting thereof, and although the present invention has been described in detail, it will be apparent to those skilled in the art that modifications may be made to the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A turbine increasing system with an AGC function comprises a turbine high-pressure cylinder (1), a turbine medium-pressure cylinder (2), a turbine low-pressure cylinder (3), a high-pressure bypass adjusting system, a medium-pressure bypass adjusting system, a low-pressure bypass adjusting system and a hydraulic load system; the high-pressure bypass regulating system, the medium-pressure bypass regulating system and the low-pressure bypass regulating system are respectively connected to a high-pressure cylinder (1) of the steam turbine, a medium-pressure cylinder (2) of the steam turbine and a low-pressure cylinder (3) of the steam turbine, and independently work for regulating the steam quantity entering each cylinder; the high-pressure bypass regulating system, the medium-pressure bypass regulating system and the low-pressure bypass regulating system are also respectively connected to a hydraulic load system, the hydraulic load system is provided with various hydraulic load components, and steam led out by the bypass is utilized to perform steam-water heat exchange with the various hydraulic load components;
the high-pressure bypass regulating system comprises a high-side steam adding machine (4) and a matched pipeline valve, a power steam interface (13) of the high-side steam adding machine (4) is connected with a main steam pipeline, a suction steam interface (14) of the high-side steam adding machine (4) is connected with a first steam extraction pipeline (15) of a steam turbine, and a steam exhaust port (17) of the high-side steam adding machine (4) is connected with a first high-pressure heater (10);
the medium-pressure bypass regulating system comprises a medium-side booster (5) and a matched pipeline valve, wherein a power steam interface (18) of the medium-side booster (5) is connected with a cold end (19) or a hot end (20) of a steam turbine reheater (16), a suction steam interface (21) of the medium-side booster (5) is connected with a medium-pressure cylinder communication pipeline (12) of the steam turbine, and a steam exhaust port (22) of the medium-side booster (5) is connected with a high-parameter heat supply network heater (9);
the low-pressure bypass regulating system comprises a low-side-increasing steam turbine (6) and a matched pipeline valve, a power steam interface (23) connected with the low-side-increasing steam turbine (6) is connected with a medium-pressure cylinder communication pipeline (12), a suction steam interface (24) of the low-side-increasing steam turbine (6) is connected with a steam turbine exhaust steam pipeline (25), and a steam exhaust port (26) of the low-side-increasing steam turbine (6) is connected with a heat supply network condenser (7);
the various hydraulic load components comprise a heat supply network condenser (7), a heat supply network heater (8), a high-parameter heat supply network heater (9), a first high-pressure heater (10) and a heat storage tank (11); and the hydraulic load system reasonably distributes and utilizes the bypass steam heat during adjustment to the unit or the heating network.
2. The steam turbine increasing system with the AGC function according to claim 1, wherein a water inlet of the heat supply network condenser (7) is connected with a heat supply and return water pipeline; the water outlet of the heat supply network condenser (7) is connected with the water inlet of the heat supply network heater (8) and the water inlet of the high-parameter heat supply network heater (25); the heat supply network heater (8) is connected with the high-parameter heat supply network heater (25) in parallel; the water outlet of the heat supply network heater (8) and the water outlet of the high-parameter heat supply network heater (25) are connected with the heat storage tank (11); the water outlet of the heat supply network heater (8) and the water outlet of the heat storage tank (11) are connected with a heat supply water outlet pipeline.
3. The steam turbine increasing system with the AGC function according to claim 1, wherein the high side steam turbine (4), the medium side steam turbine (5) and the low side steam turbine (6) are all adjustable steam turbines.
4. A method of adjusting an augmented turbine system having an AGC function according to claim 1, comprising the steps of:
a. when the load adjustment quantity required by the power grid is smaller, the load is adjusted only by opening or closing the low-voltage bypass adjustment system; when the low-pressure bypass regulating system operates, heat of the low-pressure bypass regulating system is sent to a heat supply network condenser and a heat supply network heater to heat supply network backwater, and the heat supply network backwater absorbing bypass heat is pumped into a heat storage tank (11) to be temporarily stored and sent to a heat user at proper time;
b. when the load regulation quantity required by the power grid is moderate, the load can be regulated by only opening or closing the medium-voltage bypass regulation system; the medium pressure bypass regulating system can simultaneously reduce the steam amount entering the medium pressure cylinder and the low pressure cylinder; when the solar heat collector operates at the middle side, the heat of the solar heat collector is sent to a heat supply network condenser and a high-parameter heat supply network heater to heat the return water of the heat supply network, and the heat supply network water absorbing the heat of the bypass is pumped into a heat storage tank (11) to be temporarily stored and sent to a heat user at proper time;
c. when the load regulation quantity of the power grid is relatively large, the load can be regulated only by opening or closing the high-voltage bypass regulation system; the high-pressure bypass regulating system can simultaneously reduce the steam quantity entering the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder; when the high-pressure bypass regulating system is started, the load of the power generation device is low, at the moment, the inlet smoke temperature of the denitration device is low, the effect of the SCR device is poor, at the moment, when the high-pressure bypass regulating system is operated at a high side, the heat of the denitration device is sent to a first high-pressure heater, the inlet steam temperature of the first high-pressure heater is increased when the high-pressure bypass regulating system is in a low load, and the water temperature of the first high-pressure heater is increased, so that the temperature of the smoke entering the SCR device is increased, and the denitration effect is improved;
d. when the load adjustment quantity of the power grid is larger, three bypass systems of a high-voltage bypass adjustment system, a medium-voltage bypass adjustment system and a low-voltage bypass adjustment system can be used for simultaneous adjustment.
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| CN108592137A (en) * | 2018-07-13 | 2018-09-28 | 大连亨利测控仪表工程有限公司 | A kind of thermal power plant's flexibility transformation twin-tub decoupling depth peak regulation system |
| CN108826413A (en) * | 2018-07-13 | 2018-11-16 | 大连亨利测控仪表工程有限公司 | It is a kind of to utilize intelligence injection pressure reducer auxiliary power plant frequency modulation system |
| CN108592136B (en) * | 2018-07-13 | 2023-10-31 | 大连亨利测控仪表工程有限公司 | Double-cylinder decoupling depth peak shaving system for thermal power plant flexible transformation |
| CN109578095A (en) * | 2018-10-07 | 2019-04-05 | 联合瑞升（北京）科技有限公司 | A kind of steam power plant's primary frequency control system |
| CN111271750B (en) * | 2020-03-18 | 2024-02-20 | 青岛达能环保设备股份有限公司 | Coal-fired power plant frequency modulation peak shaving system based on heat accumulator |
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