CN203081518U - Low-pressure heater large bypass adjusting device used for power grid dispatching fine adjustment - Google Patents
Low-pressure heater large bypass adjusting device used for power grid dispatching fine adjustment Download PDFInfo
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- CN203081518U CN203081518U CN 201220729212 CN201220729212U CN203081518U CN 203081518 U CN203081518 U CN 203081518U CN 201220729212 CN201220729212 CN 201220729212 CN 201220729212 U CN201220729212 U CN 201220729212U CN 203081518 U CN203081518 U CN 203081518U
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Abstract
The utility model relates to a low-pressure heater large bypass adjusting device used for power grid dispatching fine adjustment. A method of adjusting circulating water flow quantity is adopted in an existing thermodynamic circulating device in order to instantaneously increase power, and therefore disturbance to normal operation of the thermodynamic circulating device is generated, and safety production is affected. The low-pressure heater large bypass adjusting device used for the power grid dispatching fine adjustment comprises a low-pressure heater and a water inlet pipe and a water outlet pipe, wherein the water inlet pipe and the water outlet pipe are located on two sides of the low-pressure heater. A large bypass pipeline with an adjusting valve is arranged on the water inlet pipe of the low-pressure heater in a branch mode. The back end of the large bypass pipeline is communicated with the water outlet pipe of the low-pressure heater. The large bypass pipeline is erected between the water inlet pipe and the water outlet pipe which are located on the two sides of the low-pressure heater, and therefore a method of directly limiting circulating water flow quantity of the thermodynamic circulating device in an original scheme is changed, more steam is saved in a steam turbine set for working at the premise of not affecting the circulating water flow quantity of the thermodynamic circulating device, and therefore increase of output power of a steam turbine is achieved.
Description
Technical field
The utility model relates to the device in a kind of thermal power generation field, is specifically related to a kind of big bypass regulating device of low-pressure heater that is used for the dispatching of power netwoks fine setting.
Background technique
Under the prior art background, the electric energy of generator set production can not be stored on a large scale, and electrical production, transmission of electricity, distribution supply and consumption are all finished synchronously, and the generated energy of generator set need be adjusted according to the variation of consumption.
The thermoelectricity generating is according to the engineering thermodynamics basic principle, utilize water in the phase transition process of liquid and gaseous state, to have and absorb and the characteristic of release heat energy and the characteristics of the repetitive cycling utilization that can go round and begin again, and steam turbine has the ability that thermal power transfer is become mechanical energy, the chemical energy that realizes coal by boiler burning converts heat energy to, and the circulation system by water and steam is transported to heat energy and realizes in the steam turbine that thermal power transfer becomes mechanical energy again; At last, by realizing that with the coaxial generator that is connected of steam turbine mechanical energy converts electric energy to, satisfy the need for electricity of society.The circulation system of water and steam comprises equipment such as boiler, main steam line, throttle, steam turbine set, vapour condenser, condensate pump, low-pressure heater and condensing water conduit, oxygen-eliminating device, high pressure water pump, high-pressure heater and the high-pressure feed water pipeline composition of connecting successively and forming loop, and by with the generator of steam turbine set Driven by Coaxial, mechanical energy is converted to electric energy.Wherein throttle is to satisfy the network load scheduling and the main regulating equipment of setting.Steam is after multistage turbine promotes wheel rotation works done at different levels, and the energy that it had can reduce step by step, is liquid water by vapour condenser with the weary vapor condenses of gaseous state at last, is transported to the boiler repetitive cycling by water pump again and uses.For improving efficiency of thermal cycle, thermal power generation is by the heat regenerative system of drawing gas of design, with extraction opening and the extraction line of steam at different levels by the steam turbine setting, be transported to surface-type low-pressure heater respectively by the condensing water conduit serial connection, and in the surface-type high-pressure heater by the series connection of high-pressure feed water pipeline, heat the water of condensation of from vapour condenser, exporting step by step, and the high-pressure feed water of deoxygenation from oxygen-eliminating device, further improve the entering water temp of boiler, the fuel consumption of saving boiler.In the heat regenerative system of drawing gas, water of condensation (or high-pressure feed water) amount of flowing through in the steam flow that is output from steam turbine set and the heater is corresponding mutually automatically the coupling.
Existing electrical network is for guaranteeing the requirement of power consumer to power supply quality, when the thermal power generation steam turbine set that is incorporated into the power networks being carried out Automatic Generation Control (being called for short AGC) and primary frequency modulation management, the control requirement of the key technical indexes such as rate of load change that AGC and primary frequency modulation control and amplitude of variation has been proposed.The thermal power generation steam turbine set that is incorporated into the power networks at present can satisfy these requirements substantially at load shedding process throttle, but increase load process and adjust lagging reasons because of boiler burning, there are some gaps and problem with the key technical indexes of AGC and primary frequency modulation: when the need for electricity fast lifting in the electrical network, existing regulating method is to remedy traditional design to open the problems such as disturbance that the steam turbine speed control porthole is brought because of the instantaneous mistake of boiler burning adjustment hysteresis, employing is provided with regulating valve on steam turbine one-level or what extraction line, by regulating and reducing the steam extraction and measure the flow that improves steam in the steam turbine set, the mode of the potential that the container in the release circulation system is accumulated, the output power of coming the fast lifting generator set.But there is following defective in this regulative mode: the water level in oxygen-eliminating device and the vapour condenser can change and change along with condensing water flow in the low-pressure heater, increased the operation risk of steam turbine set, not only can upset the original stable working state of oxygen-eliminating device and vapour condenser, also cause the interior water of boiler and the changes in flow rate of steam, the burning adjustment and the later stage water level that influence fuel in the boiler recover the energy supply effect in stage.In addition, throttle requires to be in throttle for the scheduling of satisfying electrical network, reduces the steam turbine set Economy.
The model utility content
In order to solve the deficiencies in the prior art, the utility model provides a kind of big bypass regulating device of low-pressure heater that is used for the dispatching of power netwoks fine setting, further purpose of the present utility model is: provide a kind of response speed faster, the amplitude of accommodation is bigger, and when instantaneous lifting steam turbine set power, the circulation system of unit water or steam or the working medium balance of equipment there is not influence substantially, normal operation does not have disturbance substantially to unit, the big bypass regulating device of low-pressure heater that is used for the dispatching of power netwoks fine setting of no security risk.
The utility model is realized in the following manner: a kind of big bypass regulating device of low-pressure heater that is used for the dispatching of power netwoks fine setting, the intake pipe and the outlet pipe that comprise low-pressure heater and be positioned at its both sides, the intake pipe upper bifurcation of described low-pressure heater is provided with the big bypass duct of a band regulating valve, and the rear end of described big bypass duct is communicated with the outlet pipe of described low-pressure heater.By between described low-pressure heater both sides intake pipe and outlet pipe, setting up big bypass duct, circulating water in the low-pressure heater of flowing through is realized shunting, changed the mode that directly limits thermodynamic cycle device circulating water flow in original scheme, under the prerequisite that does not influence thermodynamic cycle device circulating water flow, control circulating water flow in the low-pressure heater by the regulating valve of controlling on the big bypass duct, and further influence the draw gas amount of extraction line to steam turbine set, allow more steam be deposited in the steam turbine set and do work, realize that the steam turbine output power promotes; Circulating water flow in the thermodynamic cycle device is shared jointly by low-pressure heater and low voltage bypass pipeline, effectively guarantees the stable operation of thermodynamic cycle device; The energy that the interior circulating water of low-pressure heater of flowing through has is lower, requirement to pipe fitting is lower, effectively reduce installation, maintenance cost, and extraction line is extracted the lower steam of energy out from low-pressure turbine, so this structure can impel steam turbine rapidly, hoisting power by a small margin, and operation risk is less.
As preferably, described big bypass duct two ends all are communicated with the intake pipe and the outlet pipe coupling of described low-pressure heater both sides respectively by a threeway.Realize between the intake pipe of big bypass duct front end and described low-pressure heater by threeway, big bypass duct rear end is communicated with the outlet pipe of described low-pressure heater, both guaranteed pipeline junction intensity, also easy disassembly, when mounted, the water inlet threeway is between the outlet conduit and described low-pressure heater intake pipe of described condensate pump; The water outlet threeway is between the intake pipe of described low-pressure heater outlet conduit and described oxygen-eliminating device.
As preferably, described regulating valve is the step-less adjustment valve.Any regulating valve of regulating valve opens and closes degree, makes that circulating water flow can be regulated arbitrarily according to the electrical network demand in the big bypass duct, can promote steam turbine power by significant instant.
The beneficial effects of the utility model: between described low-pressure heater both sides intake pipe and outlet pipe, set up big bypass duct, realization is shunted circulating water in the low-pressure heater, eliminate steam turbine and must be in the situation that the partial throttling state comes the responsive electricity grid requirement, can promote steam turbine power by significant instant, guarantee that also circulating water flow is stable in the thermodynamic cycle device, reduction is because of the influence of circulating water flow variation to boiler, oxygen-eliminating device and vapour condenser, keep the boiler oil flameholding, improve steam turbine working efficiency and Economy; The energy that circulating water owing to flow through in the low-pressure heater has is lower, requirement to pipe fitting is lower, effectively reduce installation, maintenance cost, and extraction line is extracted the lower steam of energy out from low-pressure turbine, so this structure can impel steam turbine rapidly, hoisting power by a small margin, and operation risk is less.
Description of drawings
Fig. 1 is the big bypass duct structural representation of low-pressure heater;
Fig. 2 is that the utility model structure and circulating water flow are to schematic representation;
Among the figure: 1, main steam line, 2, boiler, 3, steam turbine set, 4, vapour condenser, 5, condensate pump, 6, low-pressure heater, 7, high-pressure heater, 8, regulating valve, 9, big bypass duct, 10, threeway, 11, extraction line, 12, oxygen-eliminating device, 13, generator, 14 intake pipes, 15, outlet pipe, 16, high pressure water pump, 17, throttle.
Embodiment
Below in conjunction with specification drawings and specific embodiments substantive distinguishing features of the present utility model is further described.
A kind of big bypass regulating device of low-pressure heater that is used for the dispatching of power netwoks fine setting as shown in Figure 1, 2, the intake pipe 14 and the outlet pipe 15 that comprise low-pressure heater 6 and be positioned at its both sides, intake pipe 14 upper bifurcations of described low-pressure heater 6 are provided with the big bypass duct 9 of a band regulating valve 8, and the rear end of described big bypass duct 9 is communicated with the outlet pipe 15 of described low-pressure heater 6; Described big bypass duct 9 two ends all are communicated with the intake pipe 14 and outlet pipe 15 couplings of described low-pressure heater 6 both sides respectively by a threeway 10; Described regulating valve 8 is the step-less adjustment valve.
In running, the regulating valve 8 on the big bypass duct 9 is in closed condition usually; When electrical network needs steam turbine set fast lifting output power, open regulating valve 8, making the part water of condensation walk around low-pressure heater 6 directly enters in the outlet pipe 15, simultaneously, low-pressure heater 6 reduces the extraction amount that reduces steam from steam turbine set owing to the condensing capacity of flowing through in it, make and improve steam turbine set power fast with this by the more steam of the instantaneous acquisition of steam turbine set.At the heat-retaining capacity of opening the heat regenerative system of drawing gas that regulating valve 8 discharged fast, can be in the stable state adjustment process of electrical network, self balancing and self-regulating ability by circulation system, again recover and accumulate the accumulation of heat potential of the heat regenerative system of drawing gas, for necessary condition and ability are created in the requirement of further responsive electricity grid fast lifting load.
In practical operation, big bypass duct 9 rear ends are communicated with the outlet pipe 15 of described low-pressure heater 6, also can be connected on the oxygen-eliminating device 12 according to actual conditions, all should be considered as specific embodiment of the utility model.
In practical operation, the caliber of big bypass duct 9 is not more than described intake pipe 14 calibers, and adapts with satisfying the needed main steam flow of steam turbine set 3 fast lifting power, and the high-pressure feed water that has both satisfied shunting can pass through smoothly, also reduces the pipe laying cost.
In practical operation, the utility model can be used as replenishing and replacement scheme of original scheme regulative mode, (enter the high-pressure feed water flow of boiler not influencing thermal power generation circulation system proper functioning, boiler outputs to the main steam flow of steam turbine, the reheated steam flow, the turnover oxygen-eliminating device major parameters such as flow constant substantially) prerequisite under, the requirement that comes responsive electricity grid fast lifting load by the accumulation of heat potential that dynamically fast discharges the heat regenerative system of drawing gas, aspect the characteristic after remedying thermal power generation steam turbine set employing prior art elimination boiler output heat energy, be better than prior art, solved steam turbine set electrical network has been increased the problem that the dynamic response of load lags behind fast, and lay the foundation for the electrical network subsequent adjustment, and can be in the steady-state process that electrical network is adjusted, self balancing and self-regulating ability by circulation system, recover and accumulate the accumulation of heat potential of the heat regenerative system of drawing gas, for necessary condition and ability are created in the requirement of further responsive electricity grid fast lifting load.
In practical operation, the utility model comes in the process of requirement of responsive electricity grid fast lifting load at the accumulation of heat potential that dynamically fast discharges the heat regenerative system of drawing gas, do not influence thermal power generation circulation system proper functioning (it is constant substantially to enter major parameters such as the high-pressure feed water flow of boiler, main steam flow that boiler outputs to steam turbine, reheated steam flow, turnover oxygen-eliminating device flow), solve vapour condenser that prior art caused and deaerator level fluctuation problem, reduced the security risk of steam turbine set operation.
Claims (3)
1. one kind is used for the big bypass regulating device of low-pressure heater that dispatching of power netwoks is finely tuned, the intake pipe (14) and the outlet pipe (15) that comprise low-pressure heater (6) and be positioned at its both sides, it is characterized in that intake pipe (14) upper bifurcation of described low-pressure heater (6) is provided with the big bypass duct (9) of a band regulating valve (8), the rear end of described big bypass duct (9) is communicated with the outlet pipe (15) of described low-pressure heater (6).
2. a kind of big bypass regulating device of low-pressure heater that is used for the dispatching of power netwoks fine setting according to claim 1 is characterized in that described big bypass duct (9) two ends all are communicated with the intake pipe (14) and outlet pipe (15) coupling of described low-pressure heater (6) both sides respectively by a threeway (10).
3. a kind of big bypass regulating device of low-pressure heater that is used for the dispatching of power netwoks fine setting according to claim 1 is characterized in that described regulating valve (8) is the step-less adjustment valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220729212 CN203081518U (en) | 2012-12-26 | 2012-12-26 | Low-pressure heater large bypass adjusting device used for power grid dispatching fine adjustment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220729212 CN203081518U (en) | 2012-12-26 | 2012-12-26 | Low-pressure heater large bypass adjusting device used for power grid dispatching fine adjustment |
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| Publication Number | Publication Date |
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| CN203081518U true CN203081518U (en) | 2013-07-24 |
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| CN 201220729212 Expired - Lifetime CN203081518U (en) | 2012-12-26 | 2012-12-26 | Low-pressure heater large bypass adjusting device used for power grid dispatching fine adjustment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368749A (en) * | 2016-09-14 | 2017-02-01 | 上海明华电力技术工程有限公司 | Primary frequency regulation load increase method of participation units through cutting low-pressure heaters from water side |
| CN106968732A (en) * | 2016-01-13 | 2017-07-21 | 通用电器技术有限公司 | Run the method for steam generating equipment and implement the steam generating equipment of methods described |
| CN107542507A (en) * | 2017-07-14 | 2018-01-05 | 同济大学 | Fired power generating unit load instruction quick response device based on low-quality heat recovery |
| CN110645061A (en) * | 2019-10-31 | 2020-01-03 | 大唐郓城发电有限公司 | Double-machine regenerative system for cutting off low-pressure heater and primary frequency modulation method thereof |
-
2012
- 2012-12-26 CN CN 201220729212 patent/CN203081518U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106968732A (en) * | 2016-01-13 | 2017-07-21 | 通用电器技术有限公司 | Run the method for steam generating equipment and implement the steam generating equipment of methods described |
| CN106968732B (en) * | 2016-01-13 | 2023-10-10 | 通用电器技术有限公司 | Method for operating a steam power plant steam power plant for carrying out said method |
| CN106368749A (en) * | 2016-09-14 | 2017-02-01 | 上海明华电力技术工程有限公司 | Primary frequency regulation load increase method of participation units through cutting low-pressure heaters from water side |
| CN106368749B (en) * | 2016-09-14 | 2020-04-21 | 上海明华电力科技有限公司 | Method for cutting off water side of low-pressure heater to participate in primary frequency modulation loading of unit |
| CN107542507A (en) * | 2017-07-14 | 2018-01-05 | 同济大学 | Fired power generating unit load instruction quick response device based on low-quality heat recovery |
| CN107542507B (en) * | 2017-07-14 | 2019-06-11 | 同济大学 | Fired power generating unit load instruction quick response device based on low-quality heat recovery |
| CN110645061A (en) * | 2019-10-31 | 2020-01-03 | 大唐郓城发电有限公司 | Double-machine regenerative system for cutting off low-pressure heater and primary frequency modulation method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 310003 Hangzhou City, Fung Fung Road, No. Guoxin real estate building, building 15, building 108 Patentee after: ZHEJIANG ENERGY R & D INSTITUTE Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310052 Binjiang District Binsheng Road No. 1751 building second floor zheneng Patentee before: Zhejiang Zheneng Energy Technology Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130724 |
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| CX01 | Expiry of patent term |