CN104612766A - Saturated steam turbine power generation system applied to independent gasification island - Google Patents
Saturated steam turbine power generation system applied to independent gasification island Download PDFInfo
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Abstract
The invention provides a saturated steam turbine power generation system applied to an independent gasification island. The saturated steam turbine power generation system comprises a coal gas afterheat boiler and a steam turbine power generator set, wherein the coal gas afterheat boiler converts high-temperature coal gas heat to saturated steam; a smoke side of the coal gas afterheat boiler is connected with the high-temperature coal gas; and the steam turbine power generator set uses the saturated steam for generating power, and comprises N cascaded steam turbine parts, wherein N is not smaller than 2 and not greater than 5. The saturated steam turbine power generation system not only can more effectively eliminate high-pressure saturated steam generated in the high-temperature coal gas cooling process, but also can provide needed medium- and low-pressure steam with corresponding stages to other units of the gasification island. In addition, the power generation system also can effectively recycle low-temperature coal gas afterheat in the gasification island so as to improve the utilization rate of comprehensive energy.
Description
Technical field
The present invention relates to generating and chemical field, particularly relate to a kind of saturated steam turbine power generation system being applied to independent gasification island.
Background technique
In recent years, country, in order to develop clean combined cycle generation industry, revitalized the heavy duty gas turbine manufacturing industry of China simultaneously, and introduced and built 50 multiple stage gas theory units.And China's natural gas content is lower, deliverability of gas, price etc. all also exist larger uncertainty, and existing Combined Cycle Unit also exists the possibility of shutdown.On the basis of existing Combined Cycle Unit, being transform as with coal is integrated gasification combined cycle plants (the Integrated GasificationCombined Cycle of raw material, IGCC) power station, both our energy resource structure had been met, also for the utilization of Combined Cycle Unit provides a kind of approach, be also that solution IGCC and co-production technology invest one of approach of larger problem in early days simultaneously.The improvement project of circulating power station has been carried out in Dongguan, the 120MW level IGCC power station built at present, is namely transform on original 6B unit.
Newly-built IGCC is made up of jointly gasify island and Power island, there is complicated material, the coupling of energy and integrated between the two.First, the heat in cooling to utilize coal gas of high temperature, the general coal gas waste heat boiler that adopts cools.In newly-built IGCC, in coal gas waste heat boiler and Power island, to carry out carbonated drink integrated for bottoming cycle of a combined eycle, produces high-pressure saturated steam and be sent to end circulation.Secondly, the low pressure steam circulation extraction at the bottom of Combined Cycle Heat Recovery Boiler usually consumed is needed in the process such as gasification oven, gas purification.In addition, the heat recovery in middle low temperature coal gas cooling also often needs to carry out integrated with bottoming cycle of a combined eycle.Gas theory contains unit all in IGCC Power island, generally has a closed system of one's own, 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 prerequisite of complicated carbonated drink, how keeping gasification island independent, is the major issue that transformation IGCC faces.In fact, coal chemical product, as coal chemical industry such as ammonia from coal, dimethyl ether, ethylene glycol, rock gas, alkene, gasification island is also self-existent, faces above problem equally.
Domesticly at present building Dongguan IGCC transformation project, in its island of independently gasifying, coal gas waste heat boiler feedwater is supplied by the coal fired boiler of plant area's additional configuration.Its producing steam is the medium pressure steam of about 38.5bar, is mainly used in the process steam demand meeting other parts of gasification island.Unnecessary medium pressure steam is configured with medium pressure steam turbine for generating.In this IGCC transformation project, the heat of middle low temperature coal gas cooling procedure is directly recycled cooling water and takes away.
In the chemical plant adopting coal gas waste heat boiler cooling down high-temperature coal gas, usual coal gas waste heat boiler feedwater is also the feedwater of the coal fired boiler coming from plant area's additional configuration.In these chemical plant, compression technology steam during a part of factory adopts coal gas waste heat boiler to produce, meets the steam demand of other unit.Another part factory is then mainly used for producing high pressure superheated steam for generating, thinks that plant area provides the electric power of a part.In this technological process, coal gas waste heat boiler, except comprising radiating heat exchanger and convection recuperator, also needs to arrange superheating surface.First the feedwater of coal gas waste heat boiler becomes high-pressure saturated steam after radiation and convection recuperator heating, then is superheated to high pressure superheated steam through superheating surface, then enters turbine LP rotors and generates electricity.In addition, because gasification island, coal plant and IGCC gasify compared with island, also comprise 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 for generation of low pressure process steam, and the overwhelming majority is directly taken away by recirculated cooling water.
The analysis of technique and method is utilized to find out by above to the cooling of independent island coal gas, middle low temperature coal gas in existing IGCC improvement project and coal plant, although noticed the utilization of coal gas waste heat in part coal gas process for cooling, also there is following defect in current technique:
1), when adopting coal gas waste heat boiler to cool coal gas of high temperature, for the purpose of the process steam demand mainly with other unit of satisfied gasification island, the steam parameter that coal gas waste heat boiler produces mostly is medium pressure steam.From the angle of cascaded utilization of energy, produce medium pressure steam and the high-grade heat produced in coal gas of high temperature is not effectively utilized, thus the complex energy efficiency of system is lower.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 pressure steam arrange superheating surface in coal gas waste heat boiler.Owing to containing the solid impurities such as lime-ash in crude-gas, coal gas waste heat boiler operating conditions is severe, and design superheating surface can increase the potential safety hazard of equipment greatly.The heat exchange that heat transfer belongs between gas and gas in superheating surface, heat-transfer coefficient is little, and the area that superheating surface needs can increase greatly.The material of coal gas waste heat boiler costly, thus considerably increases the cost of coal gas waste heat boiler.
2) coal gas waste heat boiler feedwater is provided by the coal fired boiler of plant area's additional configuration usually.On the one hand, produced the mode of hot water by coal fired boiler, the capacity usage ratio of coal is lower; On the other hand, extra pipeline is needed to be connected between coal fired boiler with gasification island.
3) mode that the middle low-temperature heat quantity gasified in island is directly taken away by recirculated cooling water causes the waste of these energy, reduces the complex energy utilization ratio 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) technical problem that will solve
In view of above-mentioned technical problem, the invention provides a kind of saturated steam turbine power generation system being applied to independent gasification island, with the more effective steam utilizing independent gasification island to produce.
(2) technological scheme
According to an aspect of the present invention, a kind of saturated steam turbine power generation system being applied to independent gasification island is provided.This saturated steam turbine power generation system comprises: the coal gas waste heat boiler (100) by coal gas of high temperature converting heat being saturated vapour, and its fume side is connected with coal gas of high temperature; And using saturated vapour to carry out the steam turbine generator set (200) generated electricity, it comprises the steam turbine part of N number of cascade, wherein 2≤N≤5.
(3) beneficial effect
As can be seen from technique scheme, the saturated steam turbine power generation system that the present invention is applied to independent gasification island has following beneficial effect:
(1) when mating the high-pressure saturated steam feature produced in the coal gas cooling procedure of independent gasification island, by arranging saturated steam turbine generator set, high pressure steam is dissolved and utilizes, effectively make use of 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 Security of system can be improved;
(2) the steam/water circulating process in the feedwater of the coal gas waste heat boiler power generation system that can directly be proposed by the present invention provides, and is coal gas waste heat boiler supplying hot water without the need to additionally arranging independent coal fired boiler.
(3) power generation system of the present invention's proposition, 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 effectively can utilize the waste heat of the middle low temperature coal gas on independent gasification island, further increase the complex energy utilization ratio 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 power generation system on independent gasification island;
Fig. 2 is application steam turbine power generating transformation embodiment illustrated in fig. 1 power station schematic flow sheet.
[primary component]
100-coal gas waste heat boiler
200-saturated steam turbine generator set
211-high pressure cylinder; 212-first steam-water separator;
213-first reheater; 214-second reheater;
221-intermediate cylinder; 222-second steam-water separator;
223-the 3rd reheater; 231-low pressure cylinder;
241-condenser; 242-condensate pump;
243-first low-pressure feed heater; 244-second low-pressure feed heater;
245-oxygen-eliminating device; 246-first high-pressure feed-water heater;
247-second high-pressure feed-water heater; 248-boiler feed pump.
Embodiment
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 specification describe, similar or identical part all uses identical figure number.The implementation not illustrating in accompanying drawing or describe is form known to a person of ordinary skill in the art in art.In addition, although herein can providing package containing the demonstration of the parameter of particular value, should be appreciated that, parameter without the need to definitely equaling corresponding value, but can be similar to corresponding value in acceptable error margin or design constraints.The direction term mentioned in embodiment, such as " 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 and is not used 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 power generation system is proposed, its with coal gas waste heat boiler produce high-pressure saturated steam for working medium, be the mechanical energy of saturated steam turbine by the thermal energy of saturated vapour, be converted into electric energy by generator again, period can the extracting part process steam consumption that divides working substance supply to gasify island different units.Heat required in working medium circulation heating process can be cooled by gasification island coal gas and provide.
In one exemplary embodiment of the present invention, provide a kind of saturated steam turbine power generation system being applied to independent gasification island.Fig. 1 is the structural representation that the embodiment of the present invention is applied to the saturated steam turbine power generation system on independent gasification island.Please refer to Fig. 1, the saturated steam turbine power generation system that the present embodiment is applied to independent gasification island comprises: the coal gas waste heat boiler 100 by coal gas of high temperature converting heat being saturated vapour, and its fume side and gasification oven export coal gas of high temperature and be connected; And use saturated vapour to carry out the saturated steam turbine generator set 200 generated electricity, comprise the saturated steam turbine generator of several cascades.
Below respectively each constituent element of the present embodiment saturated steam turbine power generation system is described in detail.
In saturated steam turbine generator set steam-water circulation system flow process and parameter designing, the design criterion of employing is that steam turbine outlet mass dryness fraction is greater than 88%, and the pinch-point temperature difference of condensing heat-exchange is greater than 10 DEG C.Saturated vapour in view of coal gas waste heat boiler generation has the feature of high pressure, and under above design criterion, saturated steam turbine generator set has following characteristics:
1. saturated steam turbine generator set comprises three grades of cylinders, is 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 vapor; 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. be 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 medium 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 generator 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, effectively can utilize the waste heat of low temperature coal gas in gasification island, avoid the waste of this partial heat, improve the complex energy utilization ratio of system.
4. high pressure cylinder 211 and intermediate cylinder 221 are equipped with extraction opening, can extract in applicable parameter, other unit of island are gasified in low pressure steam supply; The steam pipework connecting coal gas waste heat boiler 100 and high pressure cylinder 211 is provided with extraction opening, can extract part high pressure steam for low pressure steam overheated and feed-water preheating etc.By arranging the mode of extraction opening in different positions, directly can 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 above-mentioned feature, the present embodiment is applied to saturated steam turbine generator set 200 in the saturated steam turbine power generation system on independent gasification island and comprises: high-pressure steam turbine part, medium pressure steam turbine part, lp steam turbine part and Water purification and heating system.
Please refer to Fig. 1, this high-pressure steam turbine part comprises: high pressure cylinder 211, first steam-water separator 212, first reheater 213 and the second reheater 214.Wherein, high pressure cylinder 211, its steam inlet is connected to the steam (vapor) outlet of coal gas waste heat boiler 100, generates electricity for utilizing the high pressure steam of coal gas waste heat boiler 100.The pipeline connecting coal gas waste heat boiler 100 and high pressure cylinder 211 arranges extraction opening, and the middle part of high pressure cylinder 211 arranges extraction opening.First steam-water separator 212, its steam inlet is connected to the steam-expelling port of high pressure cylinder 211, for separating of the water in the steam of being discharged by high pressure cylinder.First reheater 213, its cold side input port is connected with the steam (vapor) outlet of the first steam-water separator 212, and its hot side entrance is connected with the extraction opening in the middle part of high pressure cylinder 211.Second reheater 214, its cold side input port is connected with the cold side outlet port of the first reheater 213, its cold side outlet port is connected with the steam inlet of intermediate cylinder, its hot side entrance be connected the extraction opening that coal gas waste heat boiler 100 and high pressure cylinder 211 pipeline are arranged and be connected.First reheater 213 and the second reheater 214 heat again to the steam that the first steam-water separator 212 exports jointly.
It should be noted that, coal gas waste heat boiler 100 produce total steam flow and not all flows into high pressure cylinder 211, the steam flow flowing into high pressure cylinder 211 steam inlet to account for by coal gas waste heat boiler 100 produce the 70%-95% of total steam flow.In addition, the pipeline between connection second reheater 214 and intermediate cylinder 221 is arranged the extraction opening extracted out by some vapor, the steam extracted out by this extraction opening may be used for the unit such as gasification oven, gas shift process and synthesis in gasification island.
Please refer to Fig. 1, medium pressure steam turbine part, comprising: intermediate cylinder 221, second steam-water separator 222 and the 3rd reheater 223.Wherein, intermediate cylinder 221, the cold side outlet port that its steam inlet is connected to the reheater group of high-pressure steam turbine part is connected, and again generates electricity through carbonated drink separation for utilizing with the high pressure cylinder exhaust steam again heated.Second steam-water separator 222, its steam inlet is connected to the steam-expelling port of intermediate cylinder 221, for separating of the water in the steam of being discharged by intermediate cylinder 221.3rd reheater 223, its hot side entrance is connected with the extraction opening on high pressure cylinder connecting pipeline with coal gas waste heat boiler 100, its cold side input port is connected with the steam (vapor) outlet of the second steam-water separator 222, its cold side outlet port is connected with low pressure cylinder steam inlet, again heats for the steam exported the second steam-water separator 222.
It should be noted that, the middle part of intermediate cylinder 221 arranges extraction opening, and the steam extracted out by this extraction opening may be used for the unit such as gas purification in gasification island.
Please refer to Fig. 1, lp steam turbine part, comprising: low pressure cylinder 231, and its steam inlet is connected to the cold side outlet port of the reheater group of medium pressure steam turbine part.
Please refer to Fig. 1, saturated steam turbine power generation system also comprises: Water purification and heating system.This Water purification and heating system comprise: condenser 241, and its entrance is connected to the steam-expelling port of low pressure cylinder; To the condensate pump 242 of condensed water pressurization, its entrance is connected with the outlet of condenser 241; The low-pressure feed heater group be made up of at least one low-pressure feed heater, its water intake is connected to the outlet of condensate pump 242; Oxygen-eliminating device 245, its inlet pipeline comprises at least 3 water intakes, these 3 water intakes are connected with the water out of the water outlet of low-pressure feed heater group, the first steam-water separator 212 and the second steam-water separator 213 respectively, and its steam inlet 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 water outlet of oxygen-eliminating device 245; The high-pressure feed-water heater group be made up of at least one high-pressure feed-water heater, its water intake is connected to the outlet of boiler feed pump 248, and its water outlet is connected to the water side-entrance of coal gas waste heat boiler 100.
Wherein, low-pressure feed heater group comprises: the first low-pressure feed heater 243, is air-water heat exchanger, and its thermal source is the heat produced in middle low temperature coal gas cooling procedure, and its water intake is connected to the outlet of condensate pump 242; Second low-pressure feed heater 244, its water intake is connected to the water outlet of the first low-pressure feed heater 243, its water outlet is connected to the inlet pipeline of oxygen-eliminating device 245, and its steam inlet 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 comprises: the first high-pressure feed-water heater 246, and its water intake is connected to the outlet of boiler feed pump 248, and its steam inlet is connected to the hot side outlet of the first reheater 213; Second high-pressure feed-water heater 247, its water intake is connected to the water outlet of the first high-pressure feed-water heater 246, its water outlet is connected to the water side entrance of coal gas waste heat boiler 100, and its steam inlet is connected to the hot side outlet of the second heat exchanger 214 and the 3rd heat exchanger 223.
Below introduce the working principle of the present embodiment saturated steam turbine power generation system.
Please 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 oven, and the crude-gas A2 exported as about 350 DEG C leads to the dust removing units in gasification oven downstream.Steam side outlet is high-pressure saturated steam B1 (10MPa, 311 DEG C), the steam discharge reheating that major part steam B2 is used for high pressure cylinder 211 and low pressure cylinder 231 towards high pressure cylinder 211, small part B3 then feeds water towards high-pressure feed-water heater 246 and 247 for heating high-pressure.Middle pressure wet vapor (the pressure 4MPa that high pressure cylinder 211 exports, humidity 88%), enter the first steam-water separator 212, after isolating water wherein, medium pressure steam is successively through double reheating device 213 and 214, by extract 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 hot steam (4MPa, 296 DEG C), then enter intermediate cylinder 221.Low pressure wet vapor (the pressure 0.4MPa that intermediate cylinder 221 exports, humidity 93%) after the second steam-water separator 222, enter reheater 223, being heated as superheated vapor by coming from the partial high pressure high-temperature steam that coal gas waste heat boiler 100 exports, then entering low pressure cylinder 231.The isolated liquid water of second steam-water separator 222 enters oxygen-eliminating device 245.Wet vapor (the 0.06MPa that low pressure cylinder 231 exports, humidity 94%) enter condenser 241, total condensation is liquid water, and after enter the first low-pressure feed heater 243 and carry out condensed water preheating after condensate pump 242 pressurizes, its thermal source is the low temperature exhaust heat of coal gas A3.The water gone out after the first low-pressure feed heater 243 enters the second low-pressure feed heater 244, enters oxygen-eliminating device 245 further after heating.Heat needed for oxygen-eliminating device 245 provides by extracting the low pressure steam exported from intermediate cylinder.After the water that oxygen-eliminating device 245 exports is forced into high pressure by feed water pump 248, be heated to the high pressure water (10MPa, 301 DEG C) that Subcoold temperature is 10 DEG C, as the feedwater of coal gas waste heat boiler 100 through two-stage high-pressure feed-water heater 246 and 247.The thermal source of two-stage high-pressure feed-water heater is the high pressure steam with certain water content.
In independent gasification island, the pipeline that the medium pressure steam required for unit such as gasification oven, gas conversion, synthesis can be connected with intermediate cylinder 221 by secondary reheater 214 extracts (flowing stock C1), and the low pressure steam needed for gas purification process can be extracted by intermediate cylinder 221 (stream stock C2).
The steam side of coal gas waste heat boiler 100 shown in accompanying drawing 1 outlet flow stock B1 is divided into B2 and B3 two-part, wherein, the flow of B3 part determines that the heat needed for second and third reheater is determined, ensures that the approach temperature point of each reheater is greater 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, vapor pressure scope corresponding to " high pressure cylinder " import is 7-15MPa, and vapor pressure scope corresponding to " intermediate cylinder " import is 3-6MPa; Vapor pressure corresponding to " low pressure cylinder " import is less than 0.6MPa; " high temperature ", " middle temperature " and " low temperature " steam corresponding high pressure, low pressure and the saturation temperature corresponding to middle pressure saturated vapour, 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; The steam for being less than 160 DEG C that " low temperature " steam is corresponding.In addition, in the description of addressed coal gas cooling procedure, High Temperature High Pressure coal gas finger pressure is higher than 3MPa, and temperature is higher than the coal gas of 950 degrees Celsius, and middle low temperature coal gas refers to the coal gas of temperature 160 DEG C-350 DEG C.
Below introduce the example in application the present embodiment steam turbine power generating transformation GE company PG9351FA gas theory power station.Fig. 2 is application steam turbine power generating transformation embodiment illustrated in fig. 1 power station schematic flow sheet.
In fig 2, gasification island and the gas of saturated steam turbine power generation system that proposes of the present invention and the tie point of steam is designated.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 power generation system, and the crude-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 power generation system, is reduced further by the temperature of waste heat condensation water by coal gas.Coal gas A4 after cooling enters NHD desulfurization unit and carries out desulfurization.Purified gas after desulfurization enters the firing chamber of gas turbine after preheating.In transformation IGCC power station, the steam needed for gasification oven extracts (stream stock C1) from the pipeline before the admission end of saturated steam turbine power generation system intermediate cylinder.In NHD desulfurization unit, the required steam consumed of absorbent regeneration extracts (stream stock C2) from saturated steam turbine generator 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 the steam produced is saturated steam turbine power generating and dissolves, and can meet the process steam consumption of self.
The kinds of coals for gasification employing datong bitumite that the present embodiment is used, 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, the gross generation adopting 400MW level of the present invention to transport bed oxygen gasified IGCC transformation power station is 459.1MW, and wherein, saturated steam turbine power generation system, except providing process steam for gasification island, exports electricity and is about 16MW.The power supply efficiency transporting bed oxygen gasified IGCC transformation electric power station system is 42.45%.And under equal conditions, when adopting chilling process cooling down high-temperature coal gas, the power supply efficiency of system is only 39.45%.
Table 2 example I GCC transforms power station thermal performance
| Title | Unit | |
| Gasification oven 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 |
| Empty point power consumption | MW | 29.3 |
| System power supply power | MW | 415.7 |
| System power supply efficiency | ％ | 42.45 |
So far, by reference to the accompanying drawings the present embodiment has been described in detail.Describe according to above, the saturated steam turbine power generation system that those skilled in the art should be applied to independent gasification island to the present invention has had clearly to be familiar with.
In addition, the above-mentioned definition to each element and method is not limited in various concrete structures, shape or the mode mentioned in embodiment, and those of ordinary skill in the art can change simply it or replace, such as:
(1) although saturated steam turbine generator set is made up of three grades of steam turbine cylinders in above-described embodiment, but the present invention is not as limit, the cascade number N of saturated steam turbine can change according to the difference of coal gas waste heat boiler institute producing steam pressure, 88% is greater than for principle, general 2≤N≤5 with every level steam turbine outlet steam quality;
(2) although above-described embodiment mesohigh steam turbine part has the reheater of two-stage, medium pressure steam turbine part has the reheater of one-level, but the present invention is not as limit, in every grade of saturated steam turbine, the number of reheater can adjust 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 in Fig. 1 and high-pressure feed-water heater 246 can be replaced by the reheater such as shown in 243, and the heating of feedwater provides thermal source by middle low temperature coal gas.
In sum, the present invention on gasification island independently in situation, the high-pressure saturated steam produced in coal gas of high temperature cooling procedure of not only can effectively dissolving, and other unit that can be gasification island provide required corresponding in, low pressure steam.In addition, this power generation system also effectively can be recycled the waste heat of low temperature coal gas, can improve the complex energy utilization ratio of system.
Above-described specific embodiment; object of the present invention, technological scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. be applied to the saturated steam turbine power generation system on independent gasification island, it is characterized in that, comprising:
Be the coal gas waste heat boiler (100) of saturated vapour by coal gas of high temperature converting heat, its fume side is connected with coal gas of high temperature; And
Use the steam turbine generator set (200) that described saturated vapour carries out generating electricity, it comprises the steam turbine part of N number of cascade, wherein 2≤N≤5.
2. saturated steam turbine power generation system according to claim 1, is characterized in that, described steam turbine generator set (200) comprising:
First steam turbine part, comprising:
First cylinder (211), its steam inlet is connected to the steam (vapor) outlet of described coal gas waste heat boiler (100);
First steam-water separator (212), its steam inlet is connected to the steam-expelling port of described first cylinder (211);
The reheater group be 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 part, comprising:
Second cylinder (221), the cold side outlet port that its steam inlet is connected to the reheater group of the first steam turbine part is connected;
Second steam-water separator (222), its steam inlet is connected to the steam-expelling port of described second cylinder (221);
The reheater group be 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 part, comprising:
3rd cylinder (231), its steam inlet is connected to the cold side outlet port of the reheater group of the second steam turbine part.
3. saturated steam turbine power generation system according to claim 2, is characterized in that, the pipeline connecting described coal gas waste heat boiler (100) and described first cylinder (211) arranges extraction opening; The middle part of described first cylinder (211) arranges extraction opening; The reheater group of described first steam turbine part comprises:
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 the first 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 steam inlet of the second cylinder (221), its hot side entrance be connected the extraction opening that coal gas waste heat boiler (100) and the first cylinder (211) pipeline are arranged and be connected.
4. saturated steam turbine power generation system according to claim 3, it is characterized in that, the steam flow flowing into described first cylinder (211) steam inlet to account for by described coal gas waste heat boiler (100) produce the 70%-95% of total steam flow.
5. saturated steam turbine power generation system according to claim 3, it is characterized in that, the extraction opening pipeline between described second reheater (214) and described second cylinder (221) being arranged and some vapor extraction is also outwards provided is being provided.
6. saturated steam turbine power generation system according to claim 3, is characterized in that, in described second steam turbine part, described reheater group comprises:
3rd reheater (223), its hot side entrance is connected with the extraction opening on the first cylinder connecting pipeline with described coal gas waste heat boiler (100), its cold side input port is connected with the steam (vapor) outlet of the second steam-water separator (222), and its cold side outlet port is connected with the steam inlet of described low pressure cylinder (231).
7. saturated steam turbine power generation system according to claim 6, it is characterized in that, also comprise: Water purification and heating system, this Water purification and heating system comprise:
Condenser (241), its entrance be connected to the 3rd cylinder (231) steam-expelling port;
To the condensate pump (242) of condensed water pressurization, its entrance is connected with the outlet of condenser (241);
The low-pressure feed heater group be made up of at least one low-pressure feed heater, its water intake is connected to the outlet of described condensate pump (242);
Oxygen-eliminating device (245), its inlet pipeline comprises at least 3 water intakes, these 3 water intakes are connected with the water out of the water outlet of described low-pressure feed heater group, described first steam-water separator (212) and the second steam-water separator 213 respectively, and its steam inlet is connected with the extraction opening be positioned between described second cylinder (221) and the second steam-water separator (222) on pipeline;
Boiler feed pump (248), its import is connected with the water outlet of described oxygen-eliminating device (245);
The high-pressure feed-water heater group be made up of at least one high-pressure feed-water heater, its water intake is connected to the outlet of described boiler feed pump (248), and its water outlet is connected to the water side-entrance of described coal gas waste heat boiler (100).
8. saturated steam turbine power generation system according to claim 7, is characterized in that, described low-pressure feed heater group comprises:
First low-pressure feed heater (243) is air-water heat exchanger, and its thermal source is the heat produced in middle low temperature coal gas cooling procedure, and its water intake is connected to the outlet of described condensate pump (242);
Second low-pressure feed heater (244), its water intake is connected to the water outlet of described first low-pressure feed heater (243), its water outlet is connected to the inlet pipeline of oxygen-eliminating device (245), and its steam inlet is connected with the extraction opening be positioned between described second cylinder (221) and the second steam-water separator (222) on pipeline.
9. saturated steam turbine power generation system according to claim 7, is characterized in that, described high-pressure feed-water heater group comprises:
First high-pressure feed-water heater (246), its water intake is connected to the outlet of described boiler feed pump (248), and its steam inlet is connected to the hot side outlet of described first reheater (213);
Second high-pressure feed-water heater (247), its water intake is connected to the water outlet of described first high-pressure feed-water heater (246), its water outlet is connected to the water side entrance of described coal gas waste heat boiler (100), and its steam inlet is connected to the hot side outlet of described second reheater (214) and the 3rd reheater (223).
10. the saturated steam turbine power generation system according to any one of claim 2 to 9, is characterized in that, in described second steam turbine part, the middle part of described second cylinder (221) is arranged extracts out some vapor and the extraction opening outwards provided.
11. saturated steam turbine power generation systems according to any one of claim 2 to 9, it is characterized in that, described first cylinder is high pressure cylinder; Described second cylinder is intermediate cylinder; Described 3rd cylinder is low pressure cylinder.
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