CN203463157U - Clean synthetic gas preheating system for improving performance of IGCC (integrated gasification combined cycle) power generation facilities - Google Patents
Clean synthetic gas preheating system for improving performance of IGCC (integrated gasification combined cycle) power generation facilities Download PDFInfo
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- CN203463157U CN203463157U CN201320488699.1U CN201320488699U CN203463157U CN 203463157 U CN203463157 U CN 203463157U CN 201320488699 U CN201320488699 U CN 201320488699U CN 203463157 U CN203463157 U CN 203463157U
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Abstract
The utility model discloses a clean synthetic gas preheating system for improving performance of IGCC (integrated gasification combined cycle) power generation facilities. The clean synthetic gas preheating system comprises at least one group of and more clean synthetic gas preheating devices, an oxygen pressurization unit is connected with a high-temperature inlet of each clean synthetic gas preheating device, or the oxygen pressurization unit is connected with the high-temperature inlet of each clean synthetic gas preheating device through a pipeline for a high-temperature heat-absorbing medium, clean synthetic gas is connected with a low-temperature inlet of each clean synthetic gas preheating device through a clean synthetic gas pipeline and directly or indirectly absorbs high-temperature high-pressure oxygen heat generated by the oxygen pressurization unit by the aid of the clean synthetic gas preheating devices, and preheated clean synthetic gas is delivered to a gas turbine device. Heat of compressed O2 in an air separation mechanism is effectively utilized to preheat the clean synthetic gas of the IGCC power generation facilities. Performances such as overall efficiency of the IGCC power generation facilities is improved, harsh synthetic gas is prevented from being mixed in the clean synthetic gas to corrode the gas turbine device, and safety operation of the IGCC power generation facilities is guaranteed.
Description
Technical field
The present invention relates to a kind of pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance, belong to power generation technical field.
Background technique
Integrated gasification combined cycle (IGCC) power generating equipment is that solid or liquid fuel are converted into and can in gas-steam combined cycle system generating, produce the device of power for synthetic gas (Syngas), the recycling synthetic gas of burning.IGCC power generating equipment can comprise gasification island and Power island two large divisions.The effect on gasification island comprises that the heat of producing crude synthesis gas, reclaiming high-temperature crude synthesis gas, to produce water vapor, crude synthesis gas is carried out to dedusting and purified treatment, then carries out preheating to the clean synthetic gas after purifying.The effect of Power island is to receive the clean synthetic gas on autopneumatolysis island and utilize gas-steam combined cycle system generating to produce power.Power island can comprise one or more gas turbine installations and heat recovery steam generator (HRSG), steam turbine installation, vapour condenser and cooling tower conventionally.
In IGCC power generating equipment, the gas turbine installation in Power island and the steam turbine installation generation power that all can generate electricity.According to the system capacity equilibrium analysis of IGCC power generating equipment, to the ratio of gas turbine installation and energy that steam turbine installation is inputted, can affect the whole efficiency of IGCC power generating equipment.Improve input gas turbine installation energy and the ratio of inputting steam turbine installation energy, IGCC power generating equipment can obtain higher whole efficiency.According to gas turbine installation Energy Balance Analysis, gas turbine installation mainly receives the clean synthetic gas on autopneumatolysis island to produce power.The energy that the clean synthetic gas of raising carries is the most important mode that increases input gas turbine installation energy, and its whole efficiency to raising IGCC power generating equipment is significant.
Enter the energy that the clean synthetic gas of gas turbine installation has and can be divided into two-part: the chemical energy that a part has for synthetic gas, by synthetic gas, the burning in gas turbine burner discharges this part energy; Another part is the physics sensible heat of synthetic gas, and synthetic gas temperature is higher, and the physics sensible heat that it has is more.The physics sensible heat carrying for improving clean synthetic gas, the temperature in the time of can carrying out preheating and enter gas turbine installation to improve it clean synthetic gas, is beneficial to the whole efficiency that improves IGCC power generating equipment.
Two kinds of methods that clean synthetic gas is carried out to preheating that adopt are at present as follows:
Method one adopts the pre-thermal cleaning synthetic gas of high-temperature crude synthesis gas.First the crude synthesis gas that IGCC power generating equipment gasification island produces tentatively lowers the temperature through radiant coolers and convection cooler, and through crude synthesis gas-clean synthetic gas heat exchanger, the heat of crude synthesis gas passes to clean synthetic gas therein subsequently.Through above process, the temperature of crude synthesis gas further reduces, and crude synthesis gas enters subsequently udst separation unit and finally obtains clean synthetic gas.The clean synthetic gas temperature being heated by crude synthesis gas raises, and enters subsequently gas turbine installation to produce power.
But the deficiency of the method is while adopting the pre-thermal cleaning synthetic gas of high-temperature crude synthesis gas, the Security of IGCC power generating equipment operation reduces, its reason is that crude synthesis gas-clean synthetic gas heat exchanger easily corrodes fault, thereby can make to sneak into clean synthetic gas without the crude synthesis gas of desulfurization, enter in gas turbine installation, finally cause gas turbine installation turbine generation high-temperature sulfidation attack problem.
Method two adopts high-temperature water or the clean synthetic gas of steam heating of IGCC power generating equipment.When the crude synthesis gas process radiant coolers that produce on gasification island and convection cooler, can be in radiant coolers and convection cooler heated feed water produce the water vapor of High Temperature High Pressure, these water vapors are except being sent directly to the heat exchanger of HRSG, wherein a part of water vapor can be introduced into clean synthetic gas heater with pre-thermal cleaning synthetic gas, and then is sent to the heat exchanger of HRSG.Clean synthetic gas temperature after heating raises and is admitted to the firing chamber of gas turbine installation.In IGCC power generating equipment, the high-temperature high-pressure steam that radiant coolers and convection cooler produce can be sent to generating in steam turbine installation and produce power, the above method Shortcomings part, when adopting high-temperature water or the pre-thermal cleaning synthetic gas of water vapor, because the temperature of high-temperature water or water vapor is significantly reducing after clean synthetic gas heat exchanger, therefore it carries the energy minimizing entering in HRSG heat exchanger and steam turbine installation, this can cause steam turbine generated energy, the reduction of IGCC power generating equipment gross generation, cause the whole efficiency of IGCC power generating equipment to decline simultaneously.
Summary of the invention
Object of the present invention, it is the deficiency existing in existing clean synthetic gas pre-heating mean in order to overcome, a kind of pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance is provided, this system layout is reasonable, can utilize the heat that in existing air separation mechanism, compressed oxygen produces to carry out pre-thermal cleaning synthetic gas, save the energy; And avoided crude synthesis gas to sneak into the high-temperature sulfidation attack that clean synthetic gas causes gas turbine installation turbine, also avoid conventional method to reduce the reduction that causes IGCC power generating equipment performance because of high-temperature water or steam parameters simultaneously.
Object of the present invention can be achieved through the following technical solutions:
Pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance, comprise air separation mechanism, clean synthetic gas, heat recovery steam generator and gas turbine installation, in described air separation mechanism, be provided with oxygen compress cell, it is characterized in that: also comprise at least one group and above pre-thermal cleaning synthetic gas device, oxygen compress cell is connected with the high temperature entrance of pre-thermal cleaning synthetic gas device, or oxygen compress cell is connected with the high temperature entrance of pre-thermal cleaning synthetic gas device by the pipeline of high temperature heat-absorbing medium, clean synthetic gas is connected with the low temperature entrance of pre-thermal cleaning synthetic gas device by clean synthetic gas pipeline, the clean pre-thermal cleaning synthetic gas of synthetic gas utilization device directly or indirectly absorbs the High Temperature High Pressure oxygen heat that oxygen compress cell produces, clean synthetic gas after preheating is sent to gas turbine installation.
Further scheme of the present invention: described oxygen compress cell comprises at least one oxygen compressor, every oxygen compressor of oxygen compress cell matches with one group of pre-thermal cleaning synthetic gas device.
Further scheme of the present invention: described pre-thermal cleaning synthetic gas device comprises heat exchanger, temperature monitor, flow quantity control instrument and synthetic gas valve, the high temperature entrance of heat exchanger is connected with High Temperature High Pressure oxygen or high temperature heat-absorbing medium pipeline, the low temperature entrance of heat exchanger is connected with clean synthetic gas pipeline, synthetic gas valve is arranged on clean synthetic gas pipeline, by flow quantity control instrument, control the aperture of synthetic gas valve, temperature monitor is arranged on the synthetic gas outlet side of heat exchanger, for detection of the temperature of clean synthetic gas after preheating.
The heat of the high temperature compressed oxygen that oxygen compressor provides directly or indirectly passes to clean synthetic gas by heat exchanger, and the temperature of clean synthetic gas is improved.Temperature monitor is for monitoring the temperature of the clean synthetic gas after heat exchange, and this temperature signal is delivered to synthetic gas flow quantity control instrument, controls the aperture of synthetic gas valve to regulate the synthetic gas flow that enters heat exchanger by synthetic gas flow quantity control instrument.The effect of cooperatively interacting of temperature monitor, synthetic gas flow quantity control instrument, synthetic gas valve can realize the regulation and control of clean synthetic gas preheating final temperature.
Further scheme of the present invention: when comprise two groups or more pre-thermal cleaning synthetic gas device time, each is organized pre-thermal cleaning synthetic gas device and connects by pipeline, serial pipe is provided with total temperature detector.
Further scheme of the present invention: described air separation employing oxygen transport membrane air separation mechanism of mechanism or cryogenic air separation mechanism.
Further scheme of the present invention: be mounted with water, water vapour or other applicable heat-absorbing mediums in the pipeline of described high temperature heat-absorbing medium.
The present invention can have following outstanding beneficial effect:
1, because the present invention arranges pre-thermal cleaning synthetic gas device in IGCC power generating equipment air separation mechanism, pre-thermal cleaning synthetic gas device, the heat of high temperature compressed oxygen is delivered to clean synthetic gas, effectively utilized the heat of compressed oxygen in IGCC power generating equipment air separation mechanism, in clean synthetic gas after preheating, can not sneak into the dusty gas that contains sulphur content, avoid crude synthesis gas to sneak into the high-temperature sulfidation attack that clean synthetic gas causes gas turbine installation turbine, ensured the safe operation of IGCC power generating equipment.
While 2, adopting the pre-thermal cleaning synthetic gas of the present invention, need to be from heat recovery steam generator or other unit extracting high-temperature water or the water vapor of IGCC power generating equipment, the heat of high-temperature water or water vapor is utilized as much as possible in steam turbine installation, the problem that while having avoided adopting high-temperature water or the pre-thermal cleaning synthetic gas of water vapor, steam turbine installation, the minimizing of IGCC power generating equipment generated energy and IGCC power generating equipment whole efficiency reduce.Compare with adopting the prior art scheme of the clean synthetic gas of high-temperature water or steam heating, technical solutions according to the invention can make IGCC power generating equipment steam turbine installation generated energy, gross generation, power supply efficiency improve respectively 13-18MW, 6-12MW, 0.17%-0.28% under the same conditions.
3, in the air separation mechanism the present invention relates to, the heat of compressed oxygen is delivered in clean synthetic gas, avoided between traditional water the irretrievable shortcoming of compressed oxygen heat in cold oxygen compress technique, the heat of oxygen compression process can rationally be utilized, and is conducive to improve the overall performance of IGCC power generating equipment.With adopt high-temperature water or the pre-thermal cleaning synthetic gas of water vapor, adopt cold oxygen compress technique between traditional water to compare simultaneously, technical solutions according to the invention can make IGCC power generating equipment steam turbine installation generated energy, gross generation, power supply efficiency improve respectively 15-20MW, 14-20MW, 0.42%-0.53% under the same conditions.
Accompanying drawing explanation
Fig. 1 is the process flow diagram that the present invention is applied to IGCC power generating equipment.
Fig. 2 is that the present invention is for the process flow diagram of oxygen transport membrane air separation mechanism.
Fig. 3 is that the present invention is for the process flow diagram of the oxygen heat recovery unit of oxygen transport membrane air separation mechanism.
Fig. 4 is the process flow diagram of oxygen compress cell of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Specific embodiment 1:
With reference to Fig. 1, Fig. 2, the pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance shown in Fig. 3 and Fig. 4, comprise air separation mechanism 6, clean synthetic gas 7, at least one group and above pre-thermal cleaning synthetic gas device 30 and gas turbine installation 21, in described air separation mechanism 6, be provided with oxygen compress cell 5, described oxygen compress cell 5 comprises the oxygen compressor 5-1 of many series connection, described pre-thermal cleaning synthetic gas device 30 comprises heat exchanger 30-1, temperature monitor 30-2, flow quantity control instrument 30-3 and synthetic gas valve 30-4: described pre-thermal cleaning synthetic gas device 30 is arranged on oxygen compress cell 5, every oxygen compressor 5-1 of oxygen compress cell 5 matches with one group of pre-thermal cleaning synthetic gas device 30, clean synthetic gas 7 is inputted pre-thermal cleaning synthetic gas device 30 by clean synthetic gas pipeline 7-1, the high temperature inlet end of heat exchanger 30-1 is connected with the output terminal of oxygen compressor 5-1, the low temperature air inlet end of heat exchanger 30-1 is connected with clean synthetic gas pipeline 7-1, synthetic gas valve 30-4 is arranged on clean synthetic gas pipeline 7-1, by flow quantity control instrument 30-3, control the aperture of synthetic gas valve 30-4, temperature monitor 30-2 is arranged on the synthetic gas outlet side of heat exchanger 30-1, for detection of the temperature with controlling clean synthetic gas after preheating, clean synthetic gas 7 utilizes heat exchanger 30-1 to absorb the heat of the High Temperature High Pressure oxygen of oxygen compress cell 5 generations, clean synthetic gas after preheating is sent to gas turbine installation 21.When comprise two groups or more pre-thermal cleaning synthetic gas device 30 time, each is organized pre-thermal cleaning synthetic gas device 30 and connects by pipeline, serial pipe is provided with total temperature detector 30-5.
Pre-thermal cleaning synthetic gas method for improvement of IGCC power generating equipment performance:
1) the pre-thermal cleaning synthetic gas device 30 that improves IGCC power generating equipment performance is set, this pre-thermal cleaning synthetic gas device 30 is arranged on the air separation mechanism 6 in IGCC power generating equipment, described air separation mechanism 6 adopts oxygen transport membrane air separation mechanisms, utilize the oxygen compress cell 5 of air separation mechanism 6 that the oxygen compression of 6 generations of air separating mechanism in IGCC power generating equipment is formed to High Temperature High Pressure oxygen, pre-thermal cleaning synthetic gas device 30 comprises heat exchanger 30-1, temperature monitor 30-2 and flow control mechanism 30-3, the High Temperature High Pressure oxygen that oxygen compress cell 5 is produced is delivered to the high temperature suction port of heat exchanger 30-1 by pipeline 5-2,
2) clean synthetic gas 7 is delivered to the low temperature air inlet mouth of heat exchanger 30-1 by clean synthetic gas pipeline 7-1, the heat that utilizes heat exchanger 30-1 to absorb High Temperature High Pressure oxygen carries out preheating to clean synthetic gas 7.
3) in pre-thermal cleaning synthetic gas device 30, be also provided with temperature monitor 30-2 and flow control mechanism 30-3, at heat exchanger 30-1 outlet port set temperature detector 30-2, to detect heat exchanger 30-1 outlet port, clean the temperature of synthetic gas 7, for heat exchanger 30-1 configuration flow control mechanism 30-3 is so that the flow of clean synthetic gas 7 is controlled, the flow by controlling clean synthetic gas 7 is to regulate the temperature of clean synthetic gas after preheating.
Described oxygen compress cell 5 comprises the oxygen compressor 5-1 of many series connection, by oxygen compressor 5-1, obtain High Temperature High Pressure oxygen, every oxygen compressor 5-1 configures one group of pre-thermal cleaning synthetic gas device 30, utilize clean synthetic gas 7 to absorb the heat of High Temperature High Pressure oxygen, oxygen after cooling enters next stage oxygen compressor 5-1 compression again, thereby reduces the total power consumption of oxygen compressor 5-1.
Below in conjunction with Fig. 1-4, further describe the technological scheme to clean synthetic gas preheating in air separation mechanism 6.
As shown in Figure 2, adopt the air separation mechanism 6 of oxygen transport membrane (OTM) technology, air separation mechanism 6 by air preheater 1, burner 2 just, air gas separation unit 3, oxygen heat recovery unit 4 and oxygen compress cell 5 form, wherein air gas separation unit 3 is core components of air separation mechanism 6, air gas separation unit 3 adopts the ceramic membrane member with non-pore structure, when high temperature air (800-900 ℃) passes through ceramic membrane member, airborne oxygen can quickly diffuse to ceramic membrane member opposite side and discharge oxygen with the form of negative ion; Airborne N2 cannot pass through ceramic membrane member.
Air temperature after air preheater 1 heating is conventionally still far below 800 ℃, a small amount of clean synthetic gas 7 is by the second clean closing in feed channel 7-2 input burner 2, air after heating enters burner 2 to be mixed with clean synthetic gas 7, in burner 2, there is combustion reaction with airborne fraction oxygen (O2) and again heated in clean synthetic gas 7, after burning, liberated heat is brought up to 800-900 ℃ by air temperature, the air that burner 2 is discharged enters subsequently air gas separation unit 3 and carries out the separated of O2 and other gases (being mainly N2), O2 after separation sends into oxygen heat recovery unit 4, unsaturated water or water vapor from HRSG20 pass through intake pipe 4-5, enter the heat that oxygen heat recovery unit 4 absorbs high temperature O2, after heating, the unsaturated water of high temperature or water vapor are sent HRSG20 back to by outlet conduit 4-6, the heat that unsaturated water or water vapor absorb is finally utilized in steam turbine installation 19.N2 after separation is sent to air preheater 1 and enters the air of air gas separation unit 3 with heating, recycles high temperature N2(800-900 ℃) heat that carries.N2 after heat exchange can be directly the emptying or burner 21-1(that is sent to gas turbine installation 21 after overcompression, humidification as shown in Figure 1).
O2 after oxygen heat recovery unit 4 is processed is sent to oxygen compress cell 5, can be at 7-20bar because be sent to the air pressure scope of air gas separation unit 3, pressure through the O2 of air gas separation unit 3 gained significantly reduces, the Pressure Drop of O2 is to 1bar left and right, so need to be by oxygen compress cell 5 to its pressurization, O2 is compressed into the operation pressure of gasification oven 10, by 5 pressurizations of oxygen compress cell, obtains High Temperature High Pressure O2.Simultaneously, most of clean synthetic gas 7 is sent to oxygen compress cell 5 by clean synthetic gas pipeline 7-1, therein, the heat that clean synthetic gas 7 absorbs compression O2 by heat exchanger 5-2 is improved temperature, and the firing chamber 21-1(that the clean synthetic gas 7 of preheating is sent to gas turbine installation 21 subsequently as shown in Figure 1).From the O2 process oxygen heat recovery unit 4 of air gas separation unit 3, the temperature of O2 significantly reduces, and this is conducive to reduce the wasted work of oxygen compress cell 5.Equally, in oxygen compress cell 5, clean synthetic gas 7 absorbs the heat of compressed oxygen and O2 temperature is reduced, and this is also conducive to reduce the wasted work of oxygen compress cell 5.
As Fig. 3 has provided the oxygen heat recovery unit schematic diagram of the air separation mechanism 6 of employing oxygen transport membrane (OTM) technology.Oxygen heat recovery unit 4 is in series by two groups of heat recovering devices, and every group of heat recovering device consists of heater 4-1, oxygen temperature detector 4-2, intake pipe 4-5, outlet conduit 4-6, valve 4-3 and flow dontroller 4-4.
High temperature O2 enters in the heater 4-1 of first group, open the valve 4-3 of the intake pipe 4-5 of first group, intake pipe 4-5 from the unsaturated water of the second level high-pressure economizer outlet of HRSG20 by first group enters the heat that absorbs O2 in the heater 4-1 of first group, and the unsaturated water of high temperature after heat absorption is sent back to the outlet of the third level high-pressure economizer of HRSG20 by the outlet conduit 4-6 of first group.The oxygen temperature detector 4-2 of first group measures the temperature of the heater 4-1 oxygen outlet of first group, and this temperature signal is delivered to the flow dontroller 4-4 of first group, thereby controls the valve 4-3 aperture size of first group.The concrete adjustment process of the flow dontroller 4-4 of first group is as follows:
When the temperature of the oxygen temperature detector O2 that 4-2 surveys of first group is during higher than setting value, the flow dontroller 4-4 of first group can control the valve 4-3 of first group increases its aperture, now the flow through the unsaturated water of the valve 4-3 of first group increases, unsaturated water increases by the heat of the heater 4-1 absorption O2 of first group, and then can make the O2 temperature of the heater 4-1 outlet of first group be reduced to setting value.
O2 after the heater 4-1 exchange of first group passes in the heater 4-1 of second group, open the valve 4-3 of the intake pipe 4-5 of second group, intake pipe 4-5 from the unsaturated water of the first order high-pressure economizer entrance of HRSG20 by second group enters the heat that absorbs O2 in the heater 4-1 of second group, and the unsaturated water of high temperature after heat absorption is sent back to the outlet of the first order high-pressure economizer of HRSG20 by the outlet pipe 4-6 of second group.The oxygen temperature detector 4-2 of second group measures the O2 temperature of the heater 4-1 outlet of second group, and this temperature signal is received by the flow dontroller 4-4 of second group and for controlling the size of the valve 4-3 aperture of second group.The flow dontroller 4-4 of second group is identical with the concrete regulating method of the flow dontroller 4-4 of first group.Heat-absorbing medium through heater 4-1 can be both unsaturated water, can be also water vapor; Both can be from HRSG20 through the heat-absorbing medium of heater, also can be from other any possible component units of IGCC power generating equipment.
Above-described embodiment can be in following operating mode operation, O2 temperature from air gas separation unit 3 is 800 ℃, after the heater 4-1 of first group, the temperature of O2 can be reduced to 400,380,360,340,320,300 ℃, through the unsaturated water flow of the valve 4-3 of first group can be respectively 35,36,37,38,39,40kg/s; O2 is after the heater 4-1 of second group, and its temperature can be reduced to 200,190,180,170,160,150 ℃ again, through the unsaturated water flow of the valve 4-3 of second group, can be respectively 6,, 7,8,9,10,11kg/s; Correspondingly, the bulk supply efficiency of IGCC power generating equipment can be respectively 45.3%, 45.34%, 45.38%, 45.41%, 45.45%, 45.48%.
Fig. 4 has provided the workflow of oxygen compress cell 5 in air separation mechanism 6.Oxygen compress cell 5 comprises the oxygen compressor 5-1 of two series connection, every oxygen compressor 5-1 configures one group of pre-thermal cleaning synthetic gas device 30, every group of pre-thermal cleaning synthetic gas device 30 is by heat exchanger 30-1, temperature monitor 30-2, flow quantity control instrument 30-3, article two, pipeline and be separately positioned on two synthetic gas valve 30-4 on pipeline, 30-4-1 forms, two groups of pre-thermal cleaning synthetic gas devices 30 are connected by pipeline, on two groups of pre-thermal cleaning synthetic gas device 30 serial pipes, total temperature detector 30-5 is set, on clean synthetic gas pipeline 7-1, valve 30-6 is set, 30-6-1.
The clean synthetic gas pipeline 7-1 of most of clean synthetic gas 7 input, clean synthetic gas pipeline 7-1 is divided into a, the clean synthetic gas 7 of b two-way by valve 30-6,30-6-1, the clean synthetic gas 7 in b road is divided into c, the clean synthetic gas 7 of d two-way again with synthetic gas valve 30-4-1,30-4 by first group, the clean synthetic gas 7 in d road enters the heat of the heat exchanger 30-1 absorption compression O2 of first group, cause the O2 temperature of the heat exchanger 30-1 outlet of first group to reduce, O2 enters subsequently the oxygen compressor 5-1 of second group and is compressed into the operation pressure of gasification oven 10.The clean synthetic gas 7 in c road does not carry out preheating, it becomes the clean synthetic gas 7 in e road after mixing with the clean synthetic gas 7 in the d road of heating up after preheating, its temperature is measured by the temperature monitor 30-2 of first group, and temperature measurement signal is by the flow quantity control instrument 30-3 reception of first group and for controlling the synthetic gas valve 30-4 of first group, the aperture of 30-4-1.The concrete adjustment process of the flow quantity control instrument 30-3 of first group is as follows:
When the temperature monitor 30-2 measured temperature of first group is during lower than setting value, the flow quantity control instrument 30-3 of first group can increase the synthetic gas valve 30-4 of first group aperture, reduce the aperture of synthetic gas valve 30-4-1, can increase like this caloric receptivity of the clean synthetic gas 7 in d road, make the temperature of the clean synthetic gas 7 in e road bring up to setting value.
Equally, the clean synthetic gas 7 in a road is divided into f, the clean synthetic gas 7 of g two-way again with synthetic gas valve 30-4,30-4-1 by second group, and the clean synthetic gas 7 in f road enters the heat exchanger 30-1 of second group and absorbs the heat from the oxygen compressor 5-1 compression O2 of second group.Clean 7 of the synthetic gas in g road do not carry out preheating, it mixes and becomes the clean synthetic gas 7 in h road with the clean synthetic gas 7 in the f road of heating up after preheating, its temperature is measured by the temperature monitor 30-2 of second group, and temperature measurement signal is by the flow quantity control instrument 30-3 reception of second group and for controlling the synthetic gas valve 30-4 of second group, the aperture of 30-4-1.The regulating method of the flow quantity control instrument 30-3 of second group is identical with the flow quantity control instrument 30-3 of first group.
Finally, the clean synthetic gas 7 in the e road after the heat exchanger 30-1 preheating through first group together with mixing mutually after total temperature detector 30-5 thermometric, the clean synthetic gas 7 in h road after entering the heat exchanger 30-1 preheating of second group is entered to the burner 21-1 of gas turbine installation 21.
Above-described embodiment can be in the operation of following operating mode: from the O2 temperature of oxygen heat recovery unit 4, be that 150 ℃, pressure are 1bar, O2 pressure after the oxygen compressor 5-1 of first group is increased to 6bar, and O2 is compressed into the operation pressure 34.7bar of gasification oven 10 again through the oxygen compressor 5-1 of second group subsequently; Temperature is that the clean synthetic gas 7 of 150 ℃ enters oxygen compress cell 5, and its total discharge is 58kg/s, by valve 30-6,30-6-1, is divided into a, the clean synthetic gas 7 of b two-way, and the flow of two-way is 29kg/s.When the flow of c, the clean synthetic gas 7 in g road and d, the clean synthetic gas 7 in f road is respectively 14kg/s, 15kg/s, temperature measuring set 30-2, total temperature detector 30-5 measured temperature are 238 ℃, and now the power supply efficiency of IGCC electricity generating device is 45.39%.As need are heightened the temperature of clean synthetic gas 7 after preheating, by c, the flow of the clean synthetic gas 7 in g road is reduced to 12 successively, 10, 8, 6, 4, 2, 0kg/s, simultaneously by d, the flow of the clean synthetic gas 7 in f road rises to 17 successively, 19, 21, 23, 25, 27, 29kg/s, temperature measuring set 30-2, the temperature that total temperature detector 30-5 surveys clean synthetic gas can correspondingly rise to 250, 262, 274, 285, 296, 308, 316 ℃, the power supply efficiency of IGCC power generating equipment correspondingly rises to 45.41%, 45.42%, 45.44%, 45.45%, 45.47%, 45.49%, 45.5%.
To adopt IGCC power generating equipment system of the present invention below:
Shown in Fig. 1, IGCC power generating equipment system comprises air separation mechanism 6, fuel source 8, preparation of fuel unit 9, gasification oven 10, slag ladle 11, cooler 12, dedusting and purifying device 13, humidification saturation device 16, vapour condenser 17, cooling tower 18, steam turbine installation 19, heat recovery steam generator (HRSG) 20 and gas turbine installation 21 etc.Fuel source 8 can comprise coal, petroleum coke, living beings, tar, pitch and other all available carbonaceous materials.Fuel source 8 is by delivery of fuel to preparation of fuel unit 9, and therein, fuel can pass through the processing such as fragmentation, grinding, powder process, briquetting, granulating.Also water or other applicable liquid and additive can be sent into preparation of fuel unit 9, now the fuel from fuel source 8 can be prepared to pulpous state fuel.Also can be not to preparation of fuel unit, 9 do not add liquid and additives, now prepared fuel is dry feed.
Gasification oven 10 is fuel to be converted into the reaction device of synthetic gas.Preparation of fuel unit 9 is delivered to gasification oven 10 by fuel, therein, there is series of physical chemical reaction in fuel, these reactions can comprise the fragmentation of fuel, the gasification reaction of the partial oxidation reaction of the pyrolytic reaction of fuel, pyrolysis char, pyrolysis char and pyrolysis gas under the oxygen from air separation mechanism 6 and the effect from the water vapor of heat recovery steam generator (HRSG) 20.The operation pressure of gasification oven 8 can be in 20-85bar, and operating temperature can be in 700-1600 ℃.The primary product of gasification oven 8 is crude synthesis gas, wherein CO and H
2volume content can reach 80-85%, other compositions can comprise CH
4, CO
2, H
2o, H
2s, COS, NH
3, HCN, HCl, HF, in addition, in crude synthesis gas, also carry the flying dust that a small amount of particle is thinner.The product of gasification oven 10 also comprises slag charge, and in fuel, the overwhelming majority of ash drains into slag ladle 11 with slag charge form, and slag charge can be utilized as being used as structural material through processing.
The crude synthesis gas of gasification oven 10 outlets can have very high temperature (700-1600 ℃), and it is sent to syngas cooler 12 to produce water vapor.Syngas cooler 12 can comprise radiation syngas cooler and/or convection current syngas cooler, therein, from the unsaturated water of HRSG20, absorbs the heat of crude synthesis gas and produces saturated vapor, and saturated vapor is sent to the vaporizer in HRSG20 subsequently.After syngas cooler 12, the temperature of crude synthesis gas significantly reduces, and it is sent to dedusting and purifying device 13 subsequently.
In dedusting and purifying device 13, the compositions such as the H2S in crude synthesis gas, COS can obtain sulphur 14 through the separation of sour gas removal system, HRSG20 can be sour gas removal system process steam is provided, and this process steam becomes condensed fluid and is sent back to the heat exchanger of HRSG20 after heat exchange.Flying dust in crude synthesis gas can be able to separated and obtain grey 15 in dedusting and purifying device 13.The compositions such as the NH3 in crude synthesis gas, HCN, HCl, HF also can be removed in dedusting and purifying device 13.In addition, dedusting and purifying device 13 can receive the condensed water from vapour condenser 17, and this condensed water can further reduce the temperature of crude synthesis gas by the crude synthesis gas heat exchange with from syngas cooler 12, and the condensed water after being heated is sent to the heat exchanger of HRSG20.After dedusting and purifying device 13, from the crude synthesis gas of syngas cooler 12, become clean synthetic gas, its temperature further reduces.Low temperature clean synthetic gas enters humidification saturation device 16 subsequently, therein, water or water vapor can be added in clean synthetic gas, and this processing procedure can help to reduce the NOx discharge of gas turbine installation 21 burners.Clean synthetic gas also can enter carbon trapping system 24 subsequently, can make therein synthetic gas and highly purified CO2 gas containing high-purity H2, containing the synthetic gas of high-purity H2, can enter subsequently power plant (as hydrogen turbine or fuel cell) generating, the processing such as highly purified CO2 gas can compress, transportation, storage and utilization.
By humidification saturation device 16 clean synthetic gas 7 out, enter subsequently air separation mechanism 6, clean synthetic gas 7 absorbs the heat of compressed oxygen in air separation mechanism 6 and improves temperature, and heated clean synthetic gas enters the burner 21-1 of gas turbine installation 21 subsequently.Air separation mechanism 6 is except adding thermal cleaning synthetic gas, the nitrogen of its generation (N2) can be sent to the burner 21-1 of gas turbine installation 21 after nitrogen compressor 22 compressions, can increase the flow of the working medium that enters gas turbine installation turbine 21-2, be conducive to reduce the NOx discharge of burner 21-1 simultaneously.The N2 that air separation mechanism 6 produces also can be sent to the burner 21-1 of gas turbine installation 21 after nitrogen humidifier 23 humidifications again.In addition, the N2 that air separation mechanism 6 produces, also can be partly or entirely discharged to atmosphere environment except being sent to the burner 21-1 of gas turbine installation 21.The oxygen that air separation mechanism 6 produces is sent to gasification oven 10.
In gas turbine installation 21, from the pressurized air of gas compressor 21-4, enter burner 21-1.In burner 21-1, the clean synthetic gas after preheating and the oxygen generation combustion reaction in pressurized air, be sent to the combustion gas turbine 21-2 of gas turbine installation 21 after the High Temperature High Pressure combustion gas that burning produces mix with nitrogen.When above-mentioned gas passes through combustion gas turbine 21-2, can force turbine blade wherein to drive drive shaft rod 21-3 along the axis rotation of combustion gas turbine 21-2.Transmission shaft lever 21-3 can be connected to the first load 25, and it can be firm demand as the generator for generating electricity, and also can be other any suitable devices, and this device provides power by the rotation output of transmission shaft lever 21-3.Transmission shaft lever 21-3 can connect gas compressor 21-4 simultaneously, the blade rotary that forces gas compressor 21-4 with by air compressing to high pressure conditions.The high-pressure air that gas compressor 21-4 produces also can partly be sent to air separation mechanism 6, and this part air can be originated as the air of air separation mechanism 6 jointly with the high-pressure air from independent air compressor 26.
HRSG20 receives from the high-temperature exhaust air of combustion gas turbine 21-2 and by a plurality of heat exchangers, the heat of high-temperature exhaust air is passed to the condensed water from vapour condenser 17, to produce high temperature and high pressure steam.High-temperature exhaust air temperature after HRSG20 from combustion gas turbine 21-2 significantly reduces, and the final form with flue gas is discharged to atmosphere.The water vapor that HRSG20 produces is mainly sent to steam turbine installation 19 for driving the second load 27, the second load 27 can be firm demand as the generator for generating electricity, also can be other any suitable devices, this device provides power by the axostylus axostyle rotation output of steam turbine installation 19.The water vapor that HRSG20 produces also can be supplied in any other processing procedure of using water vapor, can the regeneration for desulfurization absorbent to dedusting and purifying device 13 of delivery technology steam as it, also can be sent to gasification oven 10 so that steam gasification agent to be provided.In addition, HRSG20 also can supply unsaturated water to syngas cooler 12, air separation mechanism 6 to absorb the heat of crude synthesis gas, high-temperature oxygen, absorb that unsaturated water after heat can be changed into saturated vapor or the unsaturated water of high temperature turns back to HRSG20 again.
As described above, the clean synthetic gas in IGCC power generating equipment system after preheating can be distributed to energy gas turbine installation 21 generatings as far as possible more, improves the whole efficiency of IGCC power generating equipment system.In system and method provided by the present invention, clean synthetic gas 7 is sent to air separation mechanism 6 and carries out preheating, both IGCC power generating equipment operation troubles or generated energy reduction in prior art can be avoided occurring, the whole efficiency of the heat raising IGCC power generating equipment of compression O2 can be utilized simultaneously.
Specific embodiment 2:
The feature of the present embodiment is: be provided with one group or three groups, four groups and four groups of above pre-thermal cleaning synthetic gas devices 30.Other features are identical with specific embodiment 1.
Specific embodiment 3:
The feature of the present embodiment is: described air separation mechanism 6 adopts cryogenic air separation mechanisms.Other features are identical with specific embodiment 1 or specific embodiment 2.
Specific embodiment 4:
The feature of the present embodiment is: described pre-thermal cleaning synthetic gas device 30 is arranged on outside the air separation mechanism 6 in IGCC power generating equipment, and described oxygen compress cell 5 is connected with the high temperature entrance of pre-thermal cleaning synthetic gas device 30 by the pipeline of high temperature heat-absorbing medium; The heat of the high-temperature oxygen that the oxygen compress cell 5 of air separation mechanism 6 produces is delivered to heat-absorbing medium, the heat-absorbing medium absorbing after heat is inputted the heat exchanger 30-1 of pre-thermal cleaning synthetic gas device 30 again by pipeline, in heat exchanger 30-1, clean synthetic gas 7 carries out heat exchange with heat-absorbing medium, the heat indirect transfer of High Temperature High Pressure oxygen is arrived to clean synthetic gas 7, thereby realize the preheating to clean synthetic gas 7, described heat-absorbing medium adopts water, water vapor or other applicable media.Other features are identical with specific embodiment 1, specific embodiment 2 or specific embodiment 3.
Claims (6)
1. for improvement of the pre-thermal cleaning synthetic gas system of IGCC power generating equipment performance, comprise air separation mechanism (6), clean synthetic gas (7) and gas turbine installation (21), in described air separation mechanism (6), be provided with oxygen compress cell (5), it is characterized in that: also comprise at least one group and above pre-thermal cleaning synthetic gas device (30), oxygen compress cell (5) is connected with the high temperature entrance of pre-thermal cleaning synthetic gas device (30), or oxygen compress cell (5) is connected with the high temperature entrance of pre-thermal cleaning synthetic gas device (30) by the pipeline of high temperature heat-absorbing medium, clean synthetic gas (7) is connected with the low temperature entrance of pre-thermal cleaning synthetic gas device (30) by clean synthetic gas pipeline (7-1), clean synthetic gas (7) utilizes pre-thermal cleaning synthetic gas device (30) directly or indirectly to absorb the High Temperature High Pressure oxygen heat that oxygen compress cell (5) produces, clean synthetic gas after preheating is sent to gas turbine installation (21).
2. the pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance according to claim 1, it is characterized in that: described oxygen compress cell (5) comprises at least one oxygen compressor (5-1), every oxygen compressor (5-1) of oxygen compress cell (5) matches with one group of pre-thermal cleaning synthetic gas device (30).
3. the pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance according to claim 1, it is characterized in that: described pre-thermal cleaning synthetic gas device (30) comprises heat exchanger (30-1), temperature monitor (30-2), flow quantity control instrument (30-3), synthetic gas valve (30-4), the high temperature entrance of heat exchanger (30-1) is connected with the pipeline of High Temperature High Pressure oxygen or high temperature heat-absorbing medium, the low temperature entrance of heat exchanger (30-1) is connected with clean synthetic gas pipeline (7-1), synthetic gas valve (30-4) is arranged on clean synthetic gas pipeline (7-1), by flow quantity control instrument (30-3), control the aperture of synthetic gas valve (30-4), temperature monitor (30-2) is arranged on the synthetic gas outlet side of heat exchanger (30-1), for detection of the temperature with controlling clean synthetic gas after preheating.
4. the pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance according to claim 1, it is characterized in that: when comprise two groups or more pre-thermal cleaning synthetic gas device (30) time, each is organized pre-thermal cleaning synthetic gas device (30) and connects by pipeline, and serial pipe is provided with total temperature detector (30-5).
5. the pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance according to claim 1, is characterized in that: described air separation mechanism (6) adopts oxygen transport membrane air separation mechanism or cryogenic air separation mechanism.
6. the pre-thermal cleaning synthetic gas system for improvement of IGCC power generating equipment performance according to claim 1, is characterized in that: in the pipeline of described high temperature heat-absorbing medium, be mounted with water, water vapour or other applicable heat-absorbing mediums.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103388497A (en) * | 2013-08-09 | 2013-11-13 | 中国能源建设集团广东省电力设计研究院 | Preheating clean synthesis gas method and system for improving IGCC (integrated gasification combined cycle) power generation facility performances |
| CN108587693A (en) * | 2018-05-24 | 2018-09-28 | 邵博 | A kind of device of fired power generating unit coupled biological matter gasification burning power generation |
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2013
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103388497A (en) * | 2013-08-09 | 2013-11-13 | 中国能源建设集团广东省电力设计研究院 | Preheating clean synthesis gas method and system for improving IGCC (integrated gasification combined cycle) power generation facility performances |
| CN103388497B (en) * | 2013-08-09 | 2015-05-20 | 中国能源建设集团广东省电力设计研究院 | Preheating clean synthesis gas method and system for improving IGCC (integrated gasification combined cycle) power generation facility performances |
| CN108587693A (en) * | 2018-05-24 | 2018-09-28 | 邵博 | A kind of device of fired power generating unit coupled biological matter gasification burning power generation |
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