CN102996191A - Double-extraction adjustable heating system of thermal power generating unit - Google Patents
Double-extraction adjustable heating system of thermal power generating unit Download PDFInfo
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- CN102996191A CN102996191A CN2012105770494A CN201210577049A CN102996191A CN 102996191 A CN102996191 A CN 102996191A CN 2012105770494 A CN2012105770494 A CN 2012105770494A CN 201210577049 A CN201210577049 A CN 201210577049A CN 102996191 A CN102996191 A CN 102996191A
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Abstract
The invention relates to the field of thermal power generating unit heating modification and discloses a double-extraction adjustable heating system of the thermal power generating unit. By modifying a turbine heating pipeline, a first by-pass pipeline and a second by-pass pipeline connected with a high-pressure cylinder and a medium-pressure cylinder in parallel are arranged on a steam supplying pipeline of the high-pressure cylinder and the medium-pressure cylinder respectively. Each by-pass pipeline is connected with an adjusting gate, a spray type desuperheater and a pressure matcher, and the pressure matcher of the first by-pass pipeline injects exhaust steam of the high-pressure cylinder to achieve high-pressure steam supplying. The second by-pass pipeline injects low-pressure extraction steam of the medium-pressure cylinder to achieve medium-pressure steam supplying. Simultaneously, the opening degree of a middle adjusting gate is adjustable, and the opening degree of the middle adjusting gate is adjusted according to exhaust steam pressure change of the high-pressure cylinder and reheating steam pressure change caused by load change. Therefore, a steam supplying pressure requirement towards the outside is met, qualified steam supplying pressure is guaranteed, a purpose of double-extraction, adjustability and heating of steam of the unit for high-pressure industries and medium-pressure industries is achieved, modification cost of a unit body is saved, and an effect of reducing energy and emission is achieved.
Description
Technical field
The present invention relates to utilize the fired power generating unit heating field, be specifically related to the adjustable heating system of a kind of fired power generating unit black soy sauce.
Background technique
The Cogeneration technology is the Energy-saving Projects of state key promotion always.Along with the developing in heating power market, the heating demand that unit is born further increases, and just must carry out transformation and upgrade to original unit, to satisfy growing heat demand.
Because the variable parameter operation characteristic of unit, and extraction steam for factories pressure requires metastable characteristics, needs to adopt the extraction steam for factories point than high parameter, to satisfy the requirement of extraction steam for factories parameter under the different load.In addition, be subjected to the impact of steam turbine structure, the parameter of drawing gas of unit is larger with load variations, so will transform turbine body, the parameter stability of guarantee industrial heating further improves the heat capacity of unit.
Be thermoelectricity pure condensate set structure connection diagram as shown in Figure 1, comprise the high-pressure cylinder G that connects successively by pipeline
1, reheater H and intermediate pressure cylinder G
2, high-pressure cylinder G
1Steam inlet be connected with main steam supply arrangement V pipeline, connect reheater H and intermediate pressure cylinder G
2Pipeline be provided with middle pitch T.Middle pitch T can only open or close fully according to the need of work of pure condensate unit, and the aperture of middle pitch T can not be regulated according to demand.If be the industrial heating unit with the pure condensate Transformation of Unit, perhaps the heating Transformation of Unit is the unit of adjustable extraction steam for factories and heating double goal, for guaranteeing the demand of extraction steam for factories parameter, conventional remodeling method is that the higher exhaust point of selection and industrial load demand parameter is as the vapour source of industrial heating.Wherein, generally select main steam as high pressure steam supply vapour source, press steam supply vapour source in four sections conducts of drawing gas of selection intermediate pressure cylinder.Because of the draw gas lifting respective change of stochastic parameter group load of each section of steam turbine, stablize constant pressure, temperature requirements in order to ensure steam supply, the steam turbine body of high-pressure cylinder and intermediate pressure cylinder and rotor all need redesign to transform, and before corresponding exhaust point, install rotating barrier additional, guarantee the demand of steam supply parameter constant when satisfying the unit varying duty.
Above-mentioned conventional remodeling method, on the one hand, higher because of the heating parameter selection, whole unit is less economical; On the other hand, need to transform turbine body, invest relatively highly, and also can there be the impact of gene basis framework in the body transformation and irrealizable technical risk.Therefore, need to seek new remodeling method, a kind of heating system that parameter is high, supply is stable that can satisfy industrial user's needs is provided, and combine with the variable parameter operation feature of unit, realize the adjustable heat supply of industrial steam supply.
Summary of the invention
The technical problem that (one) will solve
The technical problem to be solved in the present invention is how under body not being transformed, and realizes all providing the high pressure steam supply that satisfies the user under the different load, and further realizes providing the middle pressure steam supply that satisfies the user.
(2) technological scheme
In order to address the above problem, the invention provides the adjustable heating system of a kind of fired power generating unit black soy sauce, comprise the high-pressure cylinder, reheater and the intermediate pressure cylinder that connect successively by pipeline, the steam inlet of described high-pressure cylinder is connected with main steam supply arrangement pipeline, and the pipeline that connects described reheater and intermediate pressure cylinder is provided with middle pitch; Described middle pitch aperture is adjustable; Described heating system also comprises the first bypass duct that is arranged in parallel with described high-pressure cylinder, is provided with successively the first direct-contact desuperheater and the first pressure matcher on described the first bypass duct; The high-pressure admission mouth of described the first pressure matcher is connected with described the first direct-contact desuperheater, and its low pressure admission mouth is connected with the steam-expelling port of described high-pressure cylinder, and the steam-expelling port of described the first pressure matcher is connected with high pressure steam supply user.
Wherein, also be provided with the first pitch on described the first bypass duct, described the first pitch is connected with described the first direct-contact desuperheater.
Wherein, also comprise the second bypass duct that is arranged in parallel with described middle pitch and intermediate pressure cylinder, be provided with successively the second pitch, the second direct-contact desuperheater and the second pressure matcher on described the second bypass duct, the high-pressure admission mouth of described the second pressure matcher is connected with the second direct-contact desuperheater, the low pressure admission mouth of described the second pressure matcher is connected with described intermediate pressure cylinder low-pressure pumping steam mouth, and the steam-expelling port of described the second pressure matcher is connected with middle pressure steam supply user.
(3) beneficial effect
The adjustable heating system of a kind of fired power generating unit black soy sauce provided by the invention, comprise the high-pressure cylinder, reheater and the intermediate pressure cylinder that connect successively by pipeline, the steam inlet of high-pressure cylinder is connected with main steam supply arrangement pipeline, and the pipeline that connects reheater and intermediate pressure cylinder is provided with middle pitch, and middle pitch aperture is adjustable; Also comprise the first bypass duct that is arranged in parallel with high-pressure cylinder, be provided with successively the first direct-contact desuperheater and the first pressure matcher on the first bypass duct, the high-pressure admission mouth of the first pressure matcher is connected with the first direct-contact desuperheater, the low pressure admission mouth of the first pressure matcher connects the steam-expelling port of high-pressure cylinder, and the steam-expelling port of the first pressure matcher connects high pressure steam supply user.The main steam injection high-pressure cylinder steam discharge of pressure matcher high-pressure admission mouth, main steam and high-pressure cylinder steam discharge mix the high pressure steam supply as industrial user's demand, form the high pressure steam-supplying system.Utilize native system to realize the adjustable heat supply of high pressure steam supply, can change according to unit load, the aperture of pitch is to regulate the pressure before high-pressure cylinder steam-expelling port and the middle pitch in the adjusting, the high pressure steam supply of steadiness parameter is provided for high pressure steam supply user, has realized under different load, all providing the high pressure steam supply that satisfies the user.
Further, be provided with the first pitch at the first bypass duct, can adjust as required the delivery volume of main steam.
Further, set up second bypass duct in parallel with middle pitch and intermediate pressure cylinder in intermediate pressure cylinder SS road, be provided with successively the second pitch, the second direct-contact desuperheater and the second pressure matcher on the second bypass duct, the high-pressure admission mouth of the second pressure matcher is connected with the second direct-contact desuperheater, the low pressure admission mouth of the second pressure matcher is connected with the low pressure steam-expelling port of intermediate pressure cylinder, presses the steam supply user during the steam-expelling port of the second pressure matcher connects.The second pressure matcher is pressed steam supply in the conduct by intermediate pressure cylinder steam ejection intermediate pressure cylinder low pressure steam discharge after mixing, and presses steam-supplying system in the formation, presses the adjustable heat supply of steam supply in the realization.By the adjustable high pressure of middle pitch, middle pressure steam supply black soy sauce heating system, middle pitch aperture is adjustable, aperture by pitch in regulating is to regulate the reheated steam pressure before high-pressure cylinder exhaust steam pressure and the middle pitch, the adjusting of uniting simultaneously pitch and the direct-contact desuperheater of high, middle pressure heating system, realize the stable of the industrial steam supply parameter of high, middle pressure, finally realize the adjustable heat supply of black soy sauce of the industrial steam supply of high, middle pressure.This heating system need not be carried out large transformation to the unit body, the cost of reducing investment outlay; And utilize this heating system, and generating efficiency improves, and coal consumption reduces, and has significant effects of energy saving and emission reduction.
Description of drawings
Fig. 1 is a kind of thermoelectricity pure condensate set structure connection diagram in the prior art;
Fig. 2 is the adjustable heating system connection diagram of a kind of fired power generating unit black soy sauce of the present invention;
Among the figure, V: main steam supply arrangement; H: reheater; T: middle pitch; T
1: the first pitch; T
2: the second pitch; P
1: the first direct-contact desuperheater; P
2: the second direct-contact desuperheater; Y
1: the first pressure matcher; Y
2: the second pressure matcher; G
1: high-pressure cylinder; G
2: intermediate pressure cylinder; U
1: high pressure steam supply user; U
2: middle pressure steam supply user.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 2, the adjustable heating system of a kind of fired power generating unit black soy sauce of the present invention is at generator set high pressure cylinder G
1, reheater H, middle pitch T and intermediate pressure cylinder G
2Connect successively high-pressure cylinder G with pipeline
1Steam inlet be connected with pipeline with main steam supply arrangement V, main steam enters high-pressure cylinder G by pipeline
1High-pressure cylinder G
1Steam-expelling port is connecting reheater H, high-pressure cylinder G
1Steam discharge is by the rear reheated steam that forms of reheater H heating, and reheated steam flows into intermediate pressure cylinder G through the middle pitch T that is contained on the pipeline
2, be intermediate pressure cylinder G
2Steam supply.At high-pressure cylinder G
1Steam inlet and main steam lead road that main steam supply arrangement V is connected on be provided with and high-pressure cylinder G
1The first bypass duct in parallel, the first bypass duct connects the first direct-contact desuperheater P successively
1, the first pressure matcher Y
1, the first pressure matcher Y
1High-pressure admission mouth and the first direct-contact desuperheater P
1Connect the first pressure matcher Y
1The low pressure admission mouth connect high-pressure cylinder G
1Steam-expelling port.The first pressure matcher Y
1Outlet and high pressure steam supply user U
1Connect, for the user provides needed high pressure steam supply; The first pressure matcher Y
1According to the main steam throttle flow of high-pressure admission mouth, injection high-pressure cylinder G
1The steam-expelling port steam discharge provides the high pressure steam supply for the industrial user after mixing.The aperture of middle pitch T can be regulated, and the aperture of pitch T is adjustable in can realizing by control system; When the unit load variation changed, the aperture of middle pitch T was regulated as required, high-pressure cylinder G
1Corresponding variation, the first pressure matcher Y occur in the reheated steam pressure before the pressure of steam-expelling port and the middle pitch T
1The high-pressure cylinder G of injection
1Displacement is corresponding to change; Simultaneously, the first direct-contact desuperheater P
1Regulate accordingly, realize that the high pressure steam supply that heating system provides under different load meets customer demand.
Further, in order to adjust admission flow and the pressure of main steam in the first bypass duct, on the first bypass duct, also be provided with the first pitch T
1, the first pitch T
1Be arranged at main steam line with the first direct-contact desuperheater P
1Between, the first pitch T
1With the first direct-contact desuperheater P
1Connect.During work, the first pitch T
1Regulate admission flow and the pressure of main steam, and by the first direct-contact desuperheater P
1After regulating the throttle (steam) temperature of main steam, enter the first pressure matcher Y
1
In the specific works: 1) when the generator set load descended, user's heat demand is constant or increase, pitch T aperture reduced in the cooperation, makes high-pressure cylinder G
1Exhaust steam pressure improves, the first pitch T
1Aperture increases, the first direct-contact desuperheater P
1The injection flow rate respective change, improve the admission flow of main steam, the high-pressure cylinder displacement of corresponding minimizing injection is stablized constant parameter and traffic demand to guarantee the high pressure steam supply.
2) when, user heat constant when unit load and parameter increase in demand, open large the first pitch T
1Aperture increases main steam admission flow and pressure, the first direct-contact desuperheater P
1The injection flow rate respective change, the high-pressure cylinder G of injection
1The corresponding minimizing of displacement is to guarantee the parameter demand of the required high pressure steam supply of user.
High-pressure cylinder G
1Steam discharge flow to reheater H, through adding thermosetting reheated steam, reheated steam through in pitch T supply with intermediate pressure cylinder G
2
Further, the pipeline between reheater H and middle pitch T arranges and middle pitch T and intermediate pressure cylinder G
2The second bypass duct in parallel, the second bypass duct connects the second pitch T successively
2, the second direct-contact desuperheater P
2With the second pressure matcher Y
2The high-pressure admission mouth of the second pressure matcher and the second direct-contact desuperheater P
2Connect the second pressure matcher Y
2The low pressure admission mouth connect intermediate pressure cylinder G
2The low-pressure pumping steam mouth, injection intermediate pressure cylinder G
2The low pressure steam discharge, the second pressure matcher Y
2Outlet press steam supply user U in connecting
2, for the user provides middle pressure steam supply.Intermediate pressure cylinder G
2The low-pressure pumping steam mouth preferably at low pressure (LP) cylinder G
2Four sections steam chests offer steam ports, the second pressure matcher Y
2Throttle flow injection intermediate pressure cylinder G according to the high-pressure admission mouth
2Four sections draw gas.During work, middle pitch T and the second pitch T
2Common admission flow and the pressure of regulating reheated steam, and by the second direct-contact desuperheater P
2Regulate the throttle (steam) temperature of reheated steam, reheated steam is by the second pressure matcher Y
2The high-pressure admission mouth enter the second pressure matcher Y
2, injection intermediate pressure cylinder G
2The low-pressure pumping steam mouth draws gas, and is mixed into the required middle pressure steam supply of middle pressure industrial user, presses the adjustable heat supply of steam supply in the realization.
In the specific works: 1) when pressure factory steam among the decline of unit generation load, the user required to improve or be constant, middle pitch T aperture reduced, with increase high-pressure cylinder G
1Steam discharge and intermediate pressure cylinder G
2Initial steam pressure.Open large the first pitch T this moment
1Aperture, increase the flow of main steam admission, the first direct-contact desuperheater P
1The injection flow rate respective change, and the high-pressure cylinder G of corresponding minimizing injection
1The vapour amount of steam discharge is stablized constant parameter and traffic demand to guarantee the high pressure steam supply; Open simultaneously large the second pitch T
2Aperture, increase the flow of reheated steam admission, the second direct-contact desuperheater P
2The injection flow rate respective change, and the intermediate pressure cylinder G of corresponding minimizing injection
2Four sections vapour amounts of drawing gas are stablized constant parameter and traffic demand to press steam supply in guaranteeing.
When 2) pressing factory steam heat and parameter increase in demand among, the user constant when unit load, middle pitch T aperture is constant, the first pitch T
1Aperture increase, increase flow and the pressure of main steam, the first direct-contact desuperheater P
1The injection flow rate respective change so that the high-pressure cylinder G of injection
1The corresponding minimizing of vapour amount of steam discharge is to guarantee the parameter demand of user's high pressure steam supply; Simultaneously, the second pitch T
2Aperture increase, increase flow and the pressure of reheated steam, the second direct-contact desuperheater P
2The injection flow rate respective change so that the intermediate pressure cylinder G of injection
2Four sections corresponding minimizings of vapour amount of drawing gas are to guarantee to press among the user parameter demand of steam supply.
In above-mentioned steam supply adjustment process, by having adjusted the aperture of middle pitch T, the pressure before the middle pitch T changes high-pressure cylinder G
1Variation has also occured in the pressure at steam-expelling port place, as required the steam supplying amount on the first bypass duct is regulated, to guarantee the stable of high pressure steam supply parameter.In like manner, when adjusting the parameter of high pressure steam supply, the steam supply in corresponding the adjusting on pitch T and the second bypass duct is pressed the heat supply of steam supply parameter stability in the realization.
Utilize this heating system by transforming, participation adjustment that the aperture of middle pitch T is adjustable is by main steam and high-pressure cylinder G
1The steam discharge coupling provides the high pressure steam supply; By again hot arc steam and intermediate pressure cylinder G
2Four sections steam discharge couplings provide middle pressure steam supply, realize the adjustable heat supply of unit black soy sauce.After realizing industrial high pressure steam supply and the adjustable heat supply of middle pressure steam supply black soy sauce, the winter or summer energy-saving effect is remarkable, good economy performance.The generating heat consumption rate in summer is 6900kj/kWh approximately, is equivalent to approximately 258.5g/kWh of gross coal consumption rate, with transform before compare the coal consumption approximately 51.5g/kWh that descended; The generating heat consumption rate in winter is 4910kj/kWh approximately, is equivalent to approximately 184g/kWh of gross coal consumption rate, than the approximately 81g/kWh that descended before transforming.
Shown by above-described embodiment, the adjustable heating system of a kind of fired power generating unit black soy sauce of the present invention, comprise the high-pressure cylinder, reheater and the intermediate pressure cylinder that connect successively by pipeline, the steam inlet of high-pressure cylinder is connected with main steam supply arrangement pipeline, and the pipeline that connects reheater and intermediate pressure cylinder is provided with middle pitch; Also comprise the first bypass duct that is arranged in parallel with high-pressure cylinder, be provided with successively the first direct-contact desuperheater and the first pressure matcher on the first bypass duct, the low pressure admission mouth of the first pressure matcher connects the steam-expelling port of high-pressure cylinder, and the steam-expelling port of the first pressure matcher connects high pressure steam supply user.The main steam injection high-pressure cylinder steam discharge of the first pressure matcher high-pressure admission mouth is provided with the first pitch at the first bypass duct, can adjust as required the delivery volume of main steam.Main steam and high-pressure cylinder steam discharge mix the high pressure steam supply as industrial user's demand.Set up second bypass duct in parallel with middle pitch and intermediate pressure cylinder in intermediate pressure cylinder SS road, connect the second pitch, the second direct-contact desuperheater and the second pressure matcher on the second bypass duct, the second adapter mixes rear middle pressure steam supply as industrial user's demand by reheated steam injection intermediate pressure cylinder low pressure steam discharge.Middle pitch aperture can be according to the aperture of pitch in unit load variation or the customer parameter variation adjusting, in order to regulate the pressure before high-pressure cylinder steam discharge and the middle pitch, cooperate again the adjusting of pitch, direct-contact desuperheater and the pressure matcher of high, middle pressure heating system, be respectively high pressure, middle pressure steam supply user provides and stablizes the steam supply parameter, has realized all providing under different load the height that satisfies the user, middle pressure industry black soy sauce adjustable steam supply.Utilize the remodeling method of native system, need not carry out large transformation to the unit body, the cost of reducing investment outlay, and generating efficiency raising, coal consumption reduces, and has significant effects of energy saving and emission reduction.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. adjustable heating system of fired power generating unit black soy sauce, comprise the high-pressure cylinder, reheater and the intermediate pressure cylinder that connect successively by pipeline, the steam inlet of described high-pressure cylinder is connected with main steam supply arrangement pipeline, and the pipeline that connects described reheater and intermediate pressure cylinder is provided with middle pitch; It is characterized in that, described middle pitch aperture is adjustable; Described heating system also comprises the first bypass duct that is arranged in parallel with described high-pressure cylinder, is provided with successively the first direct-contact desuperheater and the first pressure matcher on described the first bypass duct; The high-pressure admission mouth of described the first pressure matcher is connected with described the first direct-contact desuperheater, and its low pressure admission mouth is connected with the steam-expelling port of described high-pressure cylinder, and the steam-expelling port of described the first pressure matcher is connected with high pressure steam supply user.
2. the adjustable heating system of fired power generating unit black soy sauce as claimed in claim 1 is characterized in that, also is provided with the first pitch on described the first bypass duct, and described the first pitch is connected with described the first direct-contact desuperheater.
3. as according to claim 1 or one of the 2 adjustable heating systems of described fired power generating unit black soy sauce, it is characterized in that, described heating system also comprises on described the second bypass duct of the second bypass duct that is arranged in parallel with described middle pitch and intermediate pressure cylinder and is provided with successively the second pitch, the second direct-contact desuperheater and the second pressure matcher, the high-pressure admission mouth of described the second pressure matcher is connected with described the second direct-contact desuperheater, the low pressure admission mouth of described the second pressure matcher is connected with described intermediate pressure cylinder low-pressure pumping steam mouth, and the steam-expelling port of described the second pressure matcher is connected with middle pressure steam supply user.
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