CN104612766B - It is applied to the saturated steam turbine electricity generation system on independent island of gasifying - Google Patents
It is applied to the saturated steam turbine electricity generation system on independent island of gasifying Download PDFInfo
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Abstract
The invention provides a kind of saturated steam turbine electricity generation system being applied to independent island of gasifying.This saturated steam turbine electricity generation system includes: be the coal gas waste heat boiler of saturated vapor by coal gas of high temperature converting heat, and its fume side is connected with coal gas of high temperature；And using saturated vapor to carry out the steam turbine generator group generated electricity, it includes the steam turbine portion of N number of cascade, wherein 2≤N≤5.Saturated steam turbine electricity generation system of the present invention not only can significantly more efficient be dissolved the high-pressure saturated steam produced in coal gas of high temperature cooling procedure, and can for other unit on island of gasifying provide required corresponding in, low-pressure steam.Additionally, the waste heat of low temperature coal gas in gasification island also can effectively be recycled by this electricity generation system, the complex energy utilization rate of system can be improved.
Description
Technical field
The present invention relates to generating and chemical field, particularly relate to a kind of saturated steam turbine electricity generation system being applied to independent island of gasifying.
Background technology
In recent years, country, in order to develop the combined cycle generation industry of cleaning, revitalized the heavy duty gas turbine manufacturing industry of China simultaneously, introduced and built 50 multiple stage gas theory units.And China's natural gas content is relatively low, deliverability of gas, price etc. all also exist bigger uncertainty, and existing Combined Cycle Unit also exists the probability of shutdown.On the basis of existing Combined Cycle Unit, it is transform as the integrated gasification combined cycle plants (IntegratedGasificationCombinedCycle being raw material with coal, IGCC) power station, both our energy resource structure had been met, also provide a kind of approach for the utilization of Combined Cycle Unit, be also solve one of IGCC and the co-production technology early stage approach investing bigger problem simultaneously.The improvement project of circulating power station has been carried out in Dongguan, at present in the 120MW level IGCC power station built, is namely transform on original 6B unit.
Newly-built IGCC, by gasifying island and Power island collectively constitutes, also exists the material of complexity, the coupling of energy and integrated between the two.First, in order to utilize the heat in coal gas of high temperature cooling, it is generally adopted coal gas waste heat boiler and cools down.In newly-built IGCC, in coal gas waste heat boiler and Power island, to carry out soda pop integrated for bottoming cycle of a combined eycle, produces high-pressure saturated steam and is sent to bottoming cycle.Secondly, the process such as gasification furnace, gas purification need the low pressure steam consumed generally to extract from Combined Cycle Heat Recovery Boiler bottoming cycle.Additionally, the heat recovery in the cooling of middle low temperature coal gas also tends to carry out integrated with bottoming cycle of a combined eycle.Gas theory contains all of unit in IGCC Power island, general from becoming a system closed, with extraneous without Exchange of material and energy.When transforming gas theory as IGCC, noted earlier and gasification island and Power island between under the integrated premise of complicated soda pop, how to keep gasification island independent, be the transformation IGCC major issue faced.It practice, coal chemicals, such as coal chemical industry such as ammonia from coal, dimethyl ether, ethylene glycol, natural gas, alkene, gasification island is also self-existent, faces above problem equally.
Domestic at present building Dongguan IGCC transformation project, in its island of independently gasifying, coal gas waste heat boiler feedwater is supplied by the coal-burning boiler of plant area's additional configuration.Its producing steam is the middle pressure steam of about 38.5bar, is mainly used in meeting the process steam demand of other parts of gasification island.Unnecessary middle pressure steam is configured with middle pressure steam turbine for generating electricity.In this IGCC transformation project, the heat of middle low temperature coal gas cooling procedure is directly taken away by recirculated cooling water.
In the chemical plant adopting coal gas waste heat boiler cooling down high-temperature coal gas, the feedwater of usual coal gas waste heat boiler also comes from the feedwater of the coal-burning boiler of plant area's additional configuration.In these chemical plant, a part of factory adopts compression technology steam in coal gas waste heat boiler generation, meets the steam demand of other unit.Another part factory is then mainly used for producing high pressure superheated steam for generating electricity, and thinks that plant area provides the electric power of a part.In this technological process, coal gas waste heat boiler, except including radiation recuperator and convection recuperator, also needs to arrange superheating surface.The feedwater of coal gas waste heat boiler becomes high-pressure saturated steam after heating with convection recuperator first via radiation, is superheated to high pressure superheated steam then through hot side, then enters turbine LP rotors and generates electricity.Further, since gasify with IGCC in gasification island, coal plant compared with island, also comprising the unit such as the change of coal gas, decarburization, synthesis, the middle-low temperature heat discharged in coal gas cooling procedure is also more.But, in current coal plant, these middle-low temperature heat minorities are used for producing low pressure process steam, and the overwhelming majority takes away either directly through recirculated cooling water.
The analysis of technique and method is utilized to can be seen that the cooling of independent island coal gas, middle low temperature coal gas in existing IGCC improvement project and coal plant by above, although part coal gas cooling technique having been noted that the utilization of coal gas waste heat, but current technique there is also following defect:
1) when adopting coal gas waste heat boiler that coal gas of high temperature is cooled down, how for the purpose of the process steam demand of other unit of satisfied gasification island, the steam parameter that coal gas waste heat boiler produces mostly is middle pressure steam.From the angle of cascaded utilization of energy, produce middle pressure steam and high-grade heat produced in coal gas of high temperature is not effectively utilized, thus the complex energy of system is inefficient.For Dongguan IGCC improvement project, its system power supply efficiency is only about 30%.When adopting coal gas waste heat boiler to produce high pressure superheated steam for generating, the further overheated needs of high steam arrange superheating surface in coal gas waste heat boiler.Owing to containing the solid impurities such as lime-ash in raw gas, coal gas waste heat boiler working condition is severe, and design superheating surface can be greatly increased the potential safety hazard of equipment.In superheating surface, heat transfer belongs to the heat exchange between gas and gas, and heat transfer coefficient is little, and the area that superheating surface needs can be greatly increased.The material of coal gas waste heat boiler costly, thus considerably increasing the cost of coal gas waste heat boiler.
2) coal gas waste heat boiler feedwater is generally provided by the coal-burning boiler of plant area's additional configuration.On the one hand, being produced the mode of hot water by coal-burning boiler, the capacity usage ratio of coal is relatively low；On the other hand, extra pipeline is needed to be connected between coal-burning boiler with gasification island.
3) mode that the middle low-temperature heat quantity in gasification island is directly taken away by recirculated cooling water causes the waste of these energy, reduces the complex energy utilization rate of system.
To sum up, the newly-built gasification island in no matter to be gas theory power plant retrofit be IGCC power station, or Coal Chemical Industry gasification island, how the steam that independent gasification island produces rationally dissolves efficiently and to supply, and how the heat in coal gas cooling procedure is used more effectively is all major issue urgently to be resolved hurrily.
Summary of the invention
(1) to solve the technical problem that
In view of above-mentioned technical problem, the invention provides a kind of saturated steam turbine electricity generation system being applied to independent island of gasifying, with the significantly more efficient steam utilizing independent gasification island to produce.
(2) technical scheme
According to an aspect of the invention, it is provided a kind of saturated steam turbine electricity generation system being applied to independent island of gasifying.This saturated steam turbine electricity generation system includes: by the coal gas waste heat boiler (100) that coal gas of high temperature converting heat is saturated vapor, its fume side is connected with coal gas of high temperature；And using saturated vapor to carry out the steam turbine generator group (200) generated electricity, it includes the steam turbine portion of N number of cascade, wherein 2≤N≤5.
(3) beneficial effect
From technique scheme it can be seen that the saturated steam turbine electricity generation system that the present invention is applied to independent gasification island has the advantages that
(1) in the coal gas cooling procedure of coupling independent gasification island when produced high-pressure saturated steam feature, by arranging saturated steam turbine generating set, high steam is dissolved and utilizes, it is effectively utilized the high-grade waste heat of coal gas of high temperature, improve energy utilization efficiency, and avoid superheating surface is set in coal gas waste heat boiler, economy and the safety of system can be improved；
(2) the steam/water circulating process in the electricity generation system that the feedwater of coal gas waste heat boiler can directly be proposed by the present invention provides, it is not necessary to additionally arranging independent coal-burning boiler is coal gas waste heat boiler supply hot water.
(3) electricity generation system that the present invention proposes, can be other unit of independent gasification island, as the processes such as gas conversion, gas purification, coal gas humidifying supply steam or the hot water of corresponding grade, and can effectively utilize the waste heat of the middle low temperature coal gas on independent island of gasifying, further increase the complex energy utilization rate of system.
Accompanying drawing explanation
Fig. 1 is the structural representation that the embodiment of the present invention is applied to the saturated steam turbine electricity generation system on independent island of gasifying；
Fig. 2 is application embodiment illustrated in fig. 1 steam turbine power generating transformation power station schematic flow sheet.
[main element]
100-coal gas waste heat boiler
200-saturated steam turbine generating set
211-high-pressure cylinder；212-the first steam-water separator；
213-the first reheater；214-the second reheater；
221-intermediate cylinder；222-the second steam-water separator；
223-the 3rd reheater；231-low-pressure cylinder；
241-condenser；242-condensate pump；
243-the first low-pressure feed heater；244-the second low-pressure feed heater；
245-oxygen-eliminating device；246-the first high-pressure feed-water heater；
247-the second high-pressure feed-water heater；248-boiler feed pump.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.It should be noted that in accompanying drawing or description describe, similar or identical part all uses identical figure number.The implementation not illustrated in accompanying drawing or describe, for form known to a person of ordinary skill in the art in art.Although it addition, the demonstration of the parameter comprising particular value can be provided herein, it is to be understood that parameter is without being definitely worth equal to corresponding, but corresponding value can be similar in acceptable error margin or design constraint.The direction term mentioned in embodiment, for instance " on ", D score, "front", "rear", "left", "right" etc., be only the direction with reference to accompanying drawing.Therefore, the direction term of use is used to illustrate not for limiting the scope of the invention.
The present invention utilizes the feature of independent gasification island steam consumption and generation, Btu utilization, a kind of saturated steam turbine electricity generation system is proposed, its with coal gas waste heat boiler produce high-pressure saturated steam for working medium, the heat energy of saturated vapor is converted into the mechanical energy of saturated steam turbine, being converted into electric energy again through electromotor, period extracting part can divide the process steam consumption of working substance supply gasification island different units.Heat required in working medium circulation heating process can be provided by the coal gas cooling of gasification island.
In one exemplary embodiment of the present invention, it is provided that a kind of saturated steam turbine electricity generation system being applied to independent island of gasifying.Fig. 1 is the structural representation that the embodiment of the present invention is applied to the saturated steam turbine electricity generation system on independent island of gasifying.Refer to Fig. 1, the present embodiment is applied to the independent saturated steam turbine electricity generation system gasifying island and includes: by the coal gas waste heat boiler 100 that coal gas of high temperature converting heat is saturated vapor, and its fume side exports coal gas of high temperature with gasification furnace and is connected；And use saturated vapor to carry out the saturated steam turbine generating set 200 generated electricity, including the saturated steam turbine electromotor of several cascades.
Individually below each ingredient of the present embodiment saturated steam turbine electricity generation system is described in detail.
In saturated steam turbine generating set steam-water circulation system flow process and parameter designing, the design criteria of employing is that steam turbine exports mass dryness fraction more than 88%, and the pinch-point temperature difference of condensing heat-exchange is more than 10 DEG C.In view of the saturated vapor of coal gas waste heat boiler generation has the feature of high pressure, under design above criterion, saturated steam turbine generating set has the feature that
1. saturated steam turbine generating set comprises three grades of cylinders, respectively high-pressure cylinder 211, intermediate cylinder 221 and low-pressure cylinder 231；Wherein, the entrance of high-pressure cylinder 211 is the high-pressure saturated steam that coal gas waste heat boiler 100 produces, and the entrance of intermediate cylinder 221 and low-pressure cylinder 231 is superheated steam；Adopt the mode of saturated steam turbine generating, meet the feature of the steam that coal gas waste heat boiler produces on the one hand, the heat of coal gas of high temperature is carried out effective utilization, on the other hand, the problem that potential safety hazard increases and cost increases caused owing to additionally arranging superheating surface can have been avoided.
2. it is provided with steam-water separator and reheater between high pressure, middle pressure and low-pressure cylinder；Wherein, the outlet of high-pressure cylinder 211 is connected with the first steam-water separator 212, and then the gas side outlet of the first steam-water separator 212 is connected with the first reheater 213 and the second reheater 214, overheated for middle pressure steam；The outlet of intermediate cylinder 221 is connected with the second steam-water separator 222, and second is provided with overheated for low-pressure steam of the 3rd reheater 223 at steam-water separator 222 gas side outlet；
3. the Water purification of saturated steam turbine generating set and heating system comprise condenser 241, condensate pump 242, the first low-pressure feed heater 243 and the second low-pressure feed heater 244, one-level oxygen-eliminating device 245, two-stage high-pressure feed-water heater 246 and 247, boiler feed pump 248；Wherein, the thermal source of low-pressure feed heater 243 is the heat discharged in middle low temperature coal gas cooling procedure, and its gas side entrance is connected with gasification island low temperature coal gas；Wherein, the first low-pressure feed heater adopts the setting of air-water heat exchanger, can effectively utilize the waste heat of low temperature coal gas in gasification island, it is to avoid the waste of this partial heat, improves the complex energy utilization rate of system.
4. high-pressure cylinder 211 and intermediate cylinder 221 are equipped with extraction opening, can extract in applicable parameter, low-pressure steam supply gasification island other unit；The steam pipework connecting coal gas waste heat boiler 100 and high-pressure cylinder 211 is provided with extraction opening, can extract that part high steam is overheated for low pressure steam and feed-water preheating etc..By arranging the mode of extraction opening in different positions, it is possible to directly extract the steam of different parameters grade from system proposed by the invention, meet the process steam demand of gasification island different units.
Based on features described above, the present embodiment is applied in the saturated steam turbine electricity generation system on independent island of gasifying saturated steam turbine generator group 200 and includes: high-pressure steam turbine part, middle pressure steam turbine part, lp steam turbine part and Water purification and heating system.
Refer to Fig. 1, this high-pressure steam turbine part includes: high-pressure cylinder the 211, first steam-water separator the 212, first reheater 213 and the second reheater 214.Wherein, high-pressure cylinder 211, its air intake is connected to the steam (vapor) outlet of coal gas waste heat boiler 100, for utilizing the high steam of coal gas waste heat boiler 100 to generate electricity.Arranging extraction opening connecting on the coal gas waste heat boiler 100 pipeline with high-pressure cylinder 211, the middle part of high-pressure cylinder 211 arranges extraction opening.First steam-water separator 212, its air intake is connected to the steam drain of high-pressure cylinder 211, for separating the water in the steam discharged by high-pressure cylinder.First reheater 213, the steam (vapor) outlet of its cold side input port and the first steam-water separator 212 is connected, and its hot side entrance is connected with the extraction opening in the middle part of high-pressure cylinder 211.Second reheater 214, the cold side outlet port of its cold side input port and the first reheater 213 is connected, and its cold side outlet port is connected with the air intake of intermediate cylinder, its hot side entrance be connected on coal gas waste heat boiler 100 and high-pressure cylinder 211 pipeline arrange extraction opening be connected.First reheater 213 and the common steam to the first steam-water separator 212 output of the second reheater 214 heat again.
It should be noted that the produced total steam flow of coal gas waste heat boiler 100 not all inflow high-pressure cylinder 211, the steam flow flowing into high-pressure cylinder 211 air intake accounts for by the 70%-95% of the produced total steam flow of coal gas waste heat boiler 100.Additionally, arrange the extraction opening extracted out by some vapor on the pipeline connected between the second reheater 214 and intermediate cylinder 221, this extraction opening the steam extracted out may be used in gasification island the unit such as gasification furnace, gas shift process and synthesis.
Refer to Fig. 1, middle pressure steam turbine part, including: intermediate cylinder the 221, second steam-water separator 222 and the 3rd reheater 223.Wherein, intermediate cylinder 221, the cold side outlet port of the reheater group that its air intake is connected to high-pressure steam turbine part is connected, and again generates electricity through steam-water separation and the high-pressure cylinder discharge steam again heated for utilizing.Second steam-water separator 222, its air intake is connected to the steam drain of intermediate cylinder 221, for separating the water in the steam discharged by intermediate cylinder 221.3rd reheater 223, its hot side entrance is connected with the extraction opening on high-pressure cylinder connecting line with coal gas waste heat boiler 100, the steam (vapor) outlet of its cold side input port and the second steam-water separator 222 is connected, its cold side outlet port is connected with low-pressure cylinder air intake, for the steam of the second steam-water separator 222 output is heated again.
It should be noted that the middle part of intermediate cylinder 221 arranges extraction opening, this extraction opening the steam extracted out may be used for the unit such as gas purification in gasification island.
Refer to Fig. 1, lp steam turbine part, including: low-pressure cylinder 231, its air intake is connected to the cold side outlet port of the reheater group of middle pressure steam turbine part.
Refer to Fig. 1, saturated steam turbine electricity generation system also includes: Water purification and heating system.This Water purification and heating system include: condenser 241, and its entrance is connected to the steam drain of low-pressure cylinder；Condensate pump 242 to condensed water pressurization, its entrance is connected with the outlet of condenser 241；The low-pressure feed heater group being made up of at least one low-pressure feed heater, its water inlet is connected to the outlet of condensate pump 242；Oxygen-eliminating device 245, its inlet pipeline comprises at least 3 water inlets, these 3 water inlets are connected with the water out of the outlet of low-pressure feed heater group, the first steam-water separator 212 and the second steam-water separator 213 respectively, and its air intake is connected with the extraction opening on pipeline between intermediate cylinder 221 and the second steam-water separator 222；Boiler feed pump 248, its import is connected with the outlet of oxygen-eliminating device 245；The high-pressure feed-water heater group being made up of at least one high-pressure feed-water heater, its water inlet is connected to the outlet of boiler feed pump 248, and its outlet is connected to the water side-entrance of coal gas waste heat boiler 100.
Wherein, low-pressure feed heater group includes: the first low-pressure feed heater 243, and for air-water heat exchanger, its thermal source is the heat produced in middle low temperature coal gas cooling procedure, and its water inlet is connected to the outlet of condensate pump 242；Second low-pressure feed heater 244, its water inlet is connected to the outlet of the first low-pressure feed heater 243, its outlet is connected to the inlet pipeline of oxygen-eliminating device 245, and its air intake is connected with the extraction opening on pipeline between intermediate cylinder 221 and the second steam-water separator 222.
Wherein, high-pressure feed-water heater group includes: the first high-pressure feed-water heater 246, and its water inlet is connected to the outlet of boiler feed pump 248, and its air intake is connected to the hot side outlet of the first reheater 213；Second high-pressure feed-water heater 247, its water inlet is connected to the outlet of the first high-pressure feed-water heater 246, and its outlet is connected to the water side entrance of coal gas waste heat boiler 100, and its air intake is connected to the hot side outlet of the second heat exchanger 214 and the 3rd heat exchanger 223.
The operation principle of the present embodiment saturated steam turbine electricity generation system introduced below.
Refer to Fig. 1, in the present invention, coal gas waste heat boiler 100 fume side entrance is the high temperature rough gas A1 (3MPa, 1350 DEG C) from gasification furnace, export into about 350 DEG C raw gas A2 lead to gasification furnace downstream dust removing units.Steam side outlet is high-pressure saturated steam B1 (10MPa, 311 DEG C), major part steam B2 leads to high-pressure cylinder 211, and small part B3 then is used for heating high-pressure feed water towards high-pressure feed-water heater 246 and 247 for the steam discharge reheating of high-pressure cylinder 211 and low-pressure cylinder 231.Middle pressure moist steam (the pressure 4MPa of high-pressure cylinder 211 outlet, humidity 88%), enter the first steam-water separator 212, after isolating water therein, middle pressure steam sequentially passes through double reheating device 213 and 214, by be drawn from coal gas waste heat boiler 100 export and the high-pressure and high-temperature steam of high-pressure cylinder 211 be heated as in press through vapours (4MPa, 296 DEG C), then enter intermediate cylinder 221.Low pressure moist steam (the pressure 0.4MPa of intermediate cylinder 221 outlet, humidity 93%) after the second steam-water separator 222, enter reheater 223, it is heated as superheated steam by coming from the partial high pressure high-temperature steam that coal gas waste heat boiler 100 exports, then enters low-pressure cylinder 231.The second isolated aqueous water of steam-water separator 222 enters oxygen-eliminating device 245.Moist steam (the 0.06MPa of low-pressure cylinder 231 outlet, humidity 94%) enter condenser 241, total condensation is aqueous water, enters the first low-pressure feed heater 243 and carry out condensed water preheating after then condensed water pump 242 pressurization, and its thermal source is the low temperature exhaust heat of coal gas A3.Go out the water after the first low-pressure feed heater 243 and enter the second low-pressure feed heater 244, enter oxygen-eliminating device 245 after heating further.Heat needed for oxygen-eliminating device 245 is provided by the low-pressure steam being drawn from intermediate cylinder outlet.The water of oxygen-eliminating device 245 outlet heats to the water under high pressure (10MPa, 301 DEG C) that degree of supercooling is 10 DEG C through two-stage high-pressure feed-water heater 246 and 247, as the feedwater of coal gas waste heat boiler 100 after being forced into high pressure by feed pump 248.The thermal source of two-stage high-pressure feed-water heater is the high steam with certain water capacity.
In independent gasification island, extracting on the pipeline that middle pressure steam required for the unit such as gasification furnace, gas conversion, synthesis can be connected with intermediate cylinder 221 by two grades of reheaters 214 (stream stock C1), the low-pressure steam needed for gas purification process can be extracted (stream stock C2) by intermediate cylinder 221.
The outlet stream stock B1 of coal gas waste heat boiler 100 steam side shown in accompanying drawing 1 is divided into B2 and B3 two parts, wherein, the flow of B3 part is determined and is determined by the heat needed for second and third reheater, it is ensured that the approach temperature point of each reheater is more than 10 DEG C, and the flow of usual B3 stream stock accounts for the 5%-30% of B1.
It should be noted that the above and steam-water circulation system description in, steam pressure corresponding to " high-pressure cylinder " import ranges for 7-15MPa, and steam pressure corresponding to " intermediate cylinder " import ranges for 3-6MPa；Steam pressure corresponding to " low-pressure cylinder " import is less than 0.6MPa；Saturation temperature corresponding to " high temperature ", " middle temperature " and " low temperature " steam correspondence high pressure, low pressure and middle pressure saturated vapor, the temperature range that wherein " high temperature " steam is corresponding is 325-286 DEG C, and the temperature range that " middle temperature " steam is corresponding is 234-276 DEG C；What " low temperature " steam was corresponding is the steam less than 160 DEG C.Additionally, in the description of the coal gas cooling procedure addressed, High Temperature High Pressure coal gas finger pressure is higher than 3MPa, the temperature coal gas higher than 950 degrees Celsius, middle low temperature coal gas refers to the coal gas of temperature 160 DEG C-350 DEG C.
The example in application the present embodiment steam turbine power generating transformation GE company PG9351FA gas theory power station introduced below.Fig. 2 is application embodiment illustrated in fig. 1 steam turbine power generating transformation power station schematic flow sheet.
In fig 2, the gas of the saturated steam turbine electricity generation system that gasification island proposes and the junction point of steam are designated with the present invention.The coal gas of high temperature A1 that transporting bed gasification stove produces enters the coal gas waste heat boiler inlet end in saturated steam turbine electricity generation system, and the raw gas A2 being cooled to 350 DEG C in coal gas waste heat boiler enters coal gas dust removal unit.Coal gas after dedusting is lowered the temperature further across gas-gas heat exchanger, then enters COS hydrolysis unit.After hydrolysis, coal gas A3 temperature is about 180 DEG C, enters the cryogenic heat exchanger inlet end in saturated steam turbine electricity generation system, the temperature of coal gas is reduced further by waste heat condensation water.Coal gas A4 after cooling enters NHD desulfurization unit and carries out desulfurization.The preheated rear combustor entering gas turbine of purified gas after desulfurization.In transformation IGCC power station, the steam needed for gasification furnace extracts (stream stock C1) from the pipeline before the admission end of saturated steam turbine electricity generation system intermediate cylinder.In NHD desulfurization unit, the required steam consumed of absorbent regeneration extracts (stream stock C2) from saturated steam turbine generating set intermediate cylinder.
From accompanying drawing 2, between gasification island, improved IGCC power station and combustion engine island except fuel interface, there is no the connection of steam.Gasification island keeps independent, and produced steam is saturated steam turbine power generating and is dissolved, and can meet the process steam consumption of self.
Kinds of coals for gasification used by the present embodiment adopts datong bitumite, and its composition and calorific value are in Table 1.
Table 1 feed coal composition and calorific value
The thermal performance that IGCC described in embodiment transforms power station is as shown in table 2.Visible, adopting the gross generation that the 400MW level of the present invention transports bed oxygen gasified IGCC transformation power station is 459.1MW, and wherein, saturated steam turbine electricity generation system is except providing process steam for gasification island, and output electricity is about 16MW.The power supplying efficiency transporting the oxygen gasified IGCC transformation electric power station system of bed is 42.45%.And under equal conditions, when adopting chilling process cooling down high-temperature coal gas, the power supplying efficiency of system is only 39.45%.
Table 2 embodiment IGCC transforms power station thermal performance
| Title | Unit | |
| Gasification furnace coal consumption | T/h | 166.0 |
| Coal gas waste heat boiler producing steam amount | T/h | 295.6 |
| Combustion engine power | MW | 286.0 |
| Steam turbine power | MW | 157.1 |
| Saturated steam turbine power | MW | 16.0 |
| Space division power consumption | MW | 29.3 |
| System power supply power | MW | 415.7 |
| System power supply efficiency | % | 42.45 |
So far, already in connection with accompanying drawing, the present embodiment has been described in detail.According to above description, the present invention should be applied to the independent saturated steam turbine electricity generation system gasifying island by those skilled in the art have been had and has clearly recognized.
Additionally, the above-mentioned definition to each element and method is not limited in various concrete structures, shape or the mode mentioned in embodiment, it can be carried out change simply or replace by those of ordinary skill in the art, for instance:
(1) although saturated steam turbine generator group is made up of three grades of steam turbine cylinders in above-described embodiment, but the present invention is not limited thereto, the cascade number N of saturated steam turbine can change according to the difference of coal gas waste heat boiler institute producing steam pressure, with every level steam turbine outlet steam quality more than 88% for principle, general 2≤N≤5；
(2) although above-described embodiment mesohigh steam turbine portion has the reheater of two-stage, middle pressure steam turbine part has the reheater of one-level, but the present invention is not limited thereto, in every grade of saturated steam turbine, the number of reheater can be adjusted as required, is generally 1 to 3；
(3) according to the concrete feature of low-temperature heat quantity grade in the difference of independent gasification island concrete technology and coal gas cooling procedure, low-pressure feed heater 244 and high-pressure feed-water heater 246 in Fig. 1 can be replaced by the such as reheater shown in 243, and the heating of feedwater is provided thermal source by middle low temperature coal gas.
In sum, the present invention when gasifying island independence, the high-pressure saturated steam produced in coal gas of high temperature cooling procedure of not only can effectively dissolving, and can for other unit on island of gasifying provide required corresponding in, low-pressure steam.Additionally, the waste heat of low temperature coal gas also can effectively be recycled by this electricity generation system, the complex energy utilization rate of system can be improved.
Particular embodiments described above; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only specific embodiments of the invention; it is not limited to the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (7)
1. the saturated steam turbine electricity generation system being applied to independent island of gasifying, it is characterised in that including:
By the coal gas waste heat boiler (100) that coal gas of high temperature converting heat is saturated vapor, its fume side is connected with coal gas of high temperature；And
Use the steam turbine generator group (200) that described saturated vapor carries out generating electricity, comprising:
First steam turbine portion, including: high-pressure cylinder (211), its air intake is connected to the steam (vapor) outlet of described coal gas waste heat boiler (100)；First steam-water separator (212), its air intake is connected to the steam drain of described high-pressure cylinder (211)；The reheater group being made up of at least one reheater, its cold side input port is connected with the steam (vapor) outlet of described first steam-water separator (212)；
Second steam turbine portion, including: intermediate cylinder (221), the cold side outlet port of the reheater group that its air intake is connected to the first steam turbine portion is connected；Second steam-water separator (222), its air intake is connected to the steam drain of medium pressure cylinder (221)；The reheater group being made up of at least one reheater, its cold side input port is connected with the steam (vapor) outlet of described second steam-water separator (222)；
3rd steam turbine portion, including: low-pressure cylinder (231), its air intake is connected to the cold side outlet port of the reheater group of the second steam turbine portion；
Wherein, the steam needed for gasification furnace extracts from the pipeline before the admission end of intermediate cylinder；In NHD desulfurization unit, the required steam consumed of absorbent regeneration extracts from intermediate cylinder；
Water purification and heating system, including:
Condenser (241), its entrance be connected to low-pressure cylinder (231) steam drain；
Condensate pump (242) to condensed water pressurization, its entrance is connected with the outlet of condenser (241)；
The low-pressure feed heater group being made up of at least one low-pressure feed heater, its water inlet is connected to the outlet of described condensate pump (242), comprising: the first low-pressure feed heater (243), for air-water heat exchanger, its thermal source is the heat produced in middle low temperature coal gas cooling procedure, its water inlet is connected to the outlet of described condensate pump (242), and its gas side entrance is connected with gasification island low temperature coal gas；Second low-pressure feed heater (244), its water inlet is connected to the outlet of described first low-pressure feed heater (243), its outlet is connected to the inlet pipeline of oxygen-eliminating device (245), and its air intake is connected with the extraction opening being positioned between medium pressure cylinder (221) and the second steam-water separator (222) on pipeline；
Oxygen-eliminating device (245), its inlet pipeline comprises at least 3 water inlets, these 3 water inlets are connected with the water out of the outlet of described low-pressure feed heater group, described first steam-water separator (212) and the second steam-water separator 213 respectively, and its air intake is connected with the extraction opening being positioned between medium pressure cylinder (221) and the second steam-water separator (222) on pipeline；
Boiler feed pump (248), its import is connected with the outlet of described oxygen-eliminating device (245)；
The high-pressure feed-water heater group being made up of at least one high-pressure feed-water heater, its water inlet is connected to the outlet of described boiler feed pump (248), and its outlet is connected to the water side-entrance of described coal gas waste heat boiler (100).
2. saturated steam turbine electricity generation system according to claim 1, it is characterised in that on the described coal gas waste heat boiler (100) pipeline with described high-pressure cylinder (211), extraction opening is set connecting；The middle part of described high-pressure cylinder (211) arranges extraction opening；The reheater group of described first steam turbine portion includes:
First reheater (213), its cold side input port is connected with the steam (vapor) outlet of described first steam-water separator (212), and its hot side entrance is connected with the extraction opening at high-pressure cylinder (211) middle part；And
Second reheater (214), its cold side input port is connected with the cold side outlet port of described first reheater (213), its cold side outlet port is connected with the air intake of intermediate cylinder (221), its hot side entrance be connected on coal gas waste heat boiler (100) and high-pressure cylinder (211) pipeline arrange extraction opening be connected.
3. saturated steam turbine electricity generation system according to claim 2, it is characterized in that, the steam flow flowing into described high-pressure cylinder (211) air intake accounts for by the 70%-95% of described coal gas waste heat boiler (100) produced total steam flow.
4. saturated steam turbine electricity generation system according to claim 2, it is characterized in that, the pipeline connected between described second reheater (214) and medium pressure cylinder (221) arranges the extraction opening extracted out by some vapor and be provided out.
5. saturated steam turbine electricity generation system according to claim 2, it is characterised in that in described second steam turbine portion, described reheater group includes:
3rd reheater (223), its hot side entrance is connected with the extraction opening on high-pressure cylinder connecting line with described coal gas waste heat boiler (100), the steam (vapor) outlet of its cold side input port and the second steam-water separator (222) is connected, and its cold side outlet port is connected with the air intake of described low-pressure cylinder (231).
6. saturated steam turbine electricity generation system according to claim 1, it is characterised in that described high-pressure feed-water heater group includes:
First high-pressure feed-water heater (246), its water inlet is connected to the outlet of described boiler feed pump (248), and its air intake is connected to the hot side outlet of described first reheater (213)；
Second high-pressure feed-water heater (247), its water inlet is connected to the outlet of described first high-pressure feed-water heater (246), its outlet is connected to the water side entrance of described coal gas waste heat boiler (100), and its air intake is connected to the hot side outlet of described second reheater (214) and the 3rd reheater (223).
7. the saturated steam turbine electricity generation system according to any one of claim 2 to 6, it is characterised in that in described second steam turbine portion, the middle part of medium pressure cylinder (221) arranges the extraction opening extracted out by some vapor and be provided out.
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| CN105465793B (en) * | 2015-12-31 | 2017-10-13 | 重庆科技学院 | Double-deck stoker fired grate formula refuse gasification burns double boiler electricity generation system |
| CN107151566B (en) * | 2017-05-19 | 2024-01-16 | 北京航天迈未科技有限公司 | Device and method for generating gas and generating power by using gas |
| CN110345773A (en) * | 2019-07-13 | 2019-10-18 | 苏州西达透平动力技术有限公司 | A kind of copper metallurgy technique mesohigh saturated vapor power generation heating system |
| CN113653544B (en) * | 2021-08-26 | 2024-02-27 | 中国科学院工程热物理研究所 | Multi-energy fusion power generation system and peak shaving method |
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| EP0379108A1 (en) * | 1989-01-19 | 1990-07-25 | Asea Brown Boveri Aktiengesellschaft | Method of generating electricity in a combined gas-steam power plant with a fuel gasification unit |
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