CN111322621A - Thermal power plant coupled waste incineration power generation system and method - Google Patents

Thermal power plant coupled waste incineration power generation system and method Download PDF

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Publication number
CN111322621A
CN111322621A CN202010150450.4A CN202010150450A CN111322621A CN 111322621 A CN111322621 A CN 111322621A CN 202010150450 A CN202010150450 A CN 202010150450A CN 111322621 A CN111322621 A CN 111322621A
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steam
boiler
waste incineration
generated
steam turbine
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Chinese (zh)
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崔华
杨豫森
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Hepp Energy Environment Technology Co ltd
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Hepp Energy Environment Technology Co ltd
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Priority to CN202010150450.4A priority Critical patent/CN111322621A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F23G5/442—Waste feed arrangements
    • F23G5/444—Waste feed arrangements for solid waste
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F23G5/46—Recuperation of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/12—Heat utilisation in combustion or incineration of waste

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Environmental & Geological Engineering (AREA)

Abstract

The invention discloses a coupled waste incineration power generation system and a coupled waste incineration power generation method for a thermal power plant, wherein the system comprises a power station boiler and a steam turbine, and a main steam pipeline of the power station boiler is communicated with the steam turbine; still include the msw incineration boiler, the msw incineration boiler includes pan feeding mouth, steam outlet, exhanst gas outlet, slag discharge port, and the pan feeding mouth is connected in rubbish storage pit through waste conveying device, and the steam outlet is linked together through the steam input port of steam connection pipe with the steam turbine, and the exhanst gas outlet is linked together through msw incineration boiler exhaust fume connection pipe and flue. According to the invention, the waste incineration boiler is coupled with the power station boiler of the thermal power plant, and the waste incineration boiler and the power station boiler share one set of flue gas treatment system, a steam turbine and a generator, so that the flue gas treatment cost after waste combustion can be greatly reduced, and the fuel flexibility and the load flexibility of the thermal power plant can be realized by using the waste incineration boiler.

Description

Thermal power plant coupled waste incineration power generation system and method
Technical Field
The invention relates to the field of waste incineration power generation, in particular to a coupling waste incineration power generation system and method for a thermal power plant.
Background
China is rich in coal resources and is a main energy structure. Coal generates energy when being combusted, and the energy is converted into electric energy through a power generation power device. However, the combustion of coal inevitably brings about the emission of carbon dioxide gas. In order to save energy and reduce emission, other fuels are generally needed as supplementary energy structures, so that the power generation efficiency is improved, and the pollution emission is reduced.
Municipal solid waste has become one of the most serious public hazards in the world today. At present, the municipal refuse treatment modes widely adopted at home and abroad mainly comprise 4 types of sanitary landfill, incineration, composting and comprehensive utilization. For a long time, most cities in China adopt the original modes of open-air stacking, natural ditch filling and landfill to treat urban garbage, and the treatment mode can cause adverse effects and potential damages to soil, underground water, atmosphere and the like. The garbage problem has practically hindered the further improvement of the people's living standard and the development of urban construction.
The development process of municipal waste treatment in developed countries shows that the waste incineration treatment has the advantages of small occupied area, easier site selection, quick treatment, obvious reduction, more thorough harmlessness, capability of recovering incineration waste heat and the like, and is more and more widely applied to countries in the world. The annual garbage incineration amount all over the world is about 1.1 hundred million tons, and most garbage incineration treatment plants are distributed in developed countries. About 1900 existing incineration plants in Japan, the annual incineration treatment capacity is nearly 4 million tons, and the method is the world with the largest waste incineration treatment scale. The development trend of garbage disposal in China is that the recycling on the basis of classified collection is more and more emphasized; the standard of landfill is higher and higher, and the proportion is gradually reduced; the waste incineration will be developed steadily, and the proportion of incineration waste heat utilization, especially waste heat power generation, will be increased to some extent.
However, the construction cost of the current waste incineration generator set is high, and particularly, the steam turbine, the generator and the flue gas treatment system except the waste incineration boiler account for a large proportion of the total investment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a thermal power plant coupling waste incineration power generation system and method, a waste incineration boiler is coupled with a thermal power plant power station boiler, and the waste incineration boiler and the power station boiler share a set of flue gas treatment system, a steam turbine and a generator, so that the flue gas treatment cost after waste combustion can be greatly reduced, and the fuel flexibility and the load flexibility of the thermal power plant can be realized by utilizing the waste incineration boiler.
In order to achieve the purpose, the invention adopts the following technical scheme:
a thermal power plant coupling waste incineration power generation system comprises a power station boiler and a steam turbine, wherein a main steam pipeline of the power station boiler is communicated with the steam turbine; the power station boiler comprises a steam drum, a superheater, an economizer, a flue and a flue gas treatment system, wherein the steam drum, the superheater, the economizer, the flue and the flue gas treatment system are communicated in sequence; the system still includes the msw incineration boiler, the msw incineration boiler includes pan feeding mouth, steam outlet, exhanst gas outlet, slag discharge port, the pan feeding mouth is connected in the rubbish storage pit through waste conveyor, the steam outlet with the steam input port of steam turbine is linked together, the exhanst gas outlet through the msw incineration boiler smoke exhaust connecting pipe with the flue is linked together.
Further, a steam outlet of the waste incineration boiler is communicated with the steam turbine through a steam connecting pipe, and/or is communicated with the steam turbine through a reheating hot section steam connecting pipe through a reheater.
Furthermore, a boiler water supply pipeline of the power station boiler and/or a condensate pipeline of the steam turbine are communicated with the waste incineration boiler through a water supply pipeline.
Further, one end of the waste incineration boiler smoke exhaust connecting pipe is communicated with a smoke outlet of the waste incineration boiler, the other end of the waste incineration boiler smoke exhaust connecting pipe is communicated with a flue, and the communicating point is arranged in front of the coal economizer or the smoke treatment system.
Further, a leachate outlet of the garbage storage pit is communicated with a hearth of the power station boiler or an evaporation treatment device arranged at the tail of the flue and in front of the flue gas treatment system, and is used for carrying out incineration evaporation treatment or flue tail evaporation treatment on leachate.
Further, a furnace flue gas discharge pipeline of the flue gas treatment system and/or a steam extraction pipeline of a steam turbine are communicated with the garbage storage pit through a drying pipe.
The system further comprises a steam flow and power generation amount calculation unit, wherein the steam flow and power generation amount calculation unit is arranged on the steam connecting pipe and is used for detecting the flow, the temperature and the pressure of the steam flowing through the steam connecting pipe and calculating the power generation amount generated by the work of the steam generated by the waste incineration boiler in the steam turbine according to the detected flow, temperature and pressure of the steam and the position of the steam turbine introduced into the steam turbine.
Furthermore, an active carbon adsorption or filtration device is arranged on the smoke discharge connecting pipe of the waste incineration boiler.
The invention also provides an operation method of the thermal power plant coupled waste incineration power generation system, which comprises the following steps:
furnace flue gas of the waste incineration boiler and the power station boiler purified by the flue gas treatment system and/or steam extracted by a steam turbine are/is used as a heat source to dry the waste fuel in the waste storage pit, and the dried waste fuel is sent into the waste incineration boiler through a conveying device to be incinerated;
conveying boiler feed water of the power station boiler and/or condensed water of a steam turbine into the waste incineration boiler through a feed water pipeline to provide a water source for generating steam by the waste incineration boiler;
steam generated by the power station boiler is heated by a heater and then enters the steam turbine through a main steam pipeline, and steam generated by the waste incineration boiler enters the steam turbine through a steam connecting pipe;
selecting an access point for steam to enter the steam turbine according to the pressure and the temperature of the steam generated by the combustion of the waste incineration boiler and the power station boiler; when the temperature of the steam in the steam turbine is reduced, the steam is sent into the reheating cold section steam connecting pipe according to the temperature and the pressure of the steam, and the steam enters the steam turbine again from the reheating hot section steam connecting pipe after being heated by the reheater, so that acting power is provided for the steam turbine;
the steam flow and generating capacity calculating unit measures the steam flow, temperature and pressure generated by the waste incineration boiler; calculating the generated energy generated by the steam generated by the waste incineration boiler acting in the steam turbine according to the detected flow, temperature and pressure of the steam and the position of the steam introduced into the steam turbine;
and the flue gas after the incineration of the waste incineration boiler enters the flue gas treatment system through the waste incineration boiler smoke discharge connecting pipe and is subjected to mixed purification treatment with the flue gas generated by the combustion of the power station boiler.
The invention also provides a carbon emission reduction method by utilizing the thermal power plant coupled waste incineration power generation system, and by adopting the thermal power plant coupled waste incineration power generation system and the operation method, the waste incineration boiler at least partially replaces steam generated by the power station boiler to enter the steam turbine to drive the generator to generate electricity, the generated energy generated by the part of steam is converted into the coal-fired quantity according to the power generation efficiency of the thermal power plant, and the carbon emission quantity which can be generated by the part of coal-fired quantity is the carbon emission reduction quantity generated by the waste incineration boiler; the specific calculation method of the carbon emission reduction amount is as follows:
the steam flow and generating capacity calculating unit measures the steam flow, temperature and pressure generated by the waste incineration boiler; calculating the generated energy generated by the steam generated by the waste incineration boiler acting in the steam turbine according to the detected flow, temperature and pressure of the steam and the position of the steam introduced into the steam turbine;
calculating the amount of substitute coal according to the generated energy of the steam generated by the waste incineration boiler; and calculating the carbon emission reduction amount generated by the waste incineration boiler according to the quantity of the alternative coal.
The invention has the beneficial effects that:
(1) the steam generated by burning the garbage in the garbage burning boiler at least partially replaces the steam generated by burning coal in the power station boiler. The garbage is used as fuel, so that the problem of urban garbage treatment is solved, and the garbage fuel is used as renewable energy, so that carbon emission reduction of a thermal power plant can be realized;
(2) the flue gas discharged by the waste incineration boiler is treated by a flue gas treatment system of the power station boiler, namely a desulfurization, denitrification and dust removal device, so that the investment of flue gas treatment equipment of the waste incineration boiler is reduced;
(3) the method is used for measuring and monitoring the steam flow parameters generated by the waste incineration boiler, and calculating the generated energy of the part of steam generated in the steam turbine and the generator in a metering manner, wherein the power price of the part of generated energy is the power price of the power on the power.
Drawings
Fig. 1 is a schematic structural diagram of a system according to embodiment 1 of the present invention.
Fig. 2 is a schematic flow chart of a method in embodiment 2 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
A thermal power plant coupling waste incineration power generation system is shown in figure 1 and comprises a power station boiler 2 and a steam turbine 3, wherein a main steam pipeline 8 of the power station boiler 2 is communicated with a steam input port of the steam turbine 3; the power station boiler comprises a steam drum 4, a superheater 5, an economizer 6, a flue 21 and a flue gas treatment system 7, wherein the steam drum 4, the superheater 5, the economizer 6, the flue 21 and the flue gas treatment system 7 are communicated in sequence; the system still includes msw incineration boiler 1, msw incineration boiler 1 includes pan feeding mouth, steam outlet, exhanst gas outlet, slag discharge port, the pan feeding mouth passes through waste conveyor and connects in rubbish pit 20, steam outlet through steam connecting pipe 9 with the steam input port of steam turbine 3 is linked together, the exhanst gas outlet through msw incineration boiler exhaust fume connecting pipe 13 with flue 21 is linked together.
Further, the steam outlet of the waste incineration boiler 1 is communicated with the steam turbine 3 through a steam connecting pipe 9, and/or is communicated with the steam turbine 3 through a reheating section steam connecting pipe 10 through a reheater 12.
Further, a boiler feed water pipeline of the utility boiler 2 and/or a condensate water pipeline of the steam turbine 3 are communicated with the waste incineration boiler 1 through a feed water pipeline 14.
Further, one end of the waste incineration boiler smoke discharge connecting pipe 13 is communicated with the smoke outlet of the waste incineration boiler 1, the other end of the waste incineration boiler smoke discharge connecting pipe is communicated with the smoke channel 21, and the communication point is arranged in front of the economizer 6 or the smoke treatment system 7.
Further, a leachate outlet of the waste storage pit 20 is communicated with a furnace or an evaporation treatment device 19 of the utility boiler 1, and the evaporation treatment device 19 is arranged at the tail of the flue 12 and in front of the flue gas treatment system 7 and is used for carrying out incineration evaporation treatment on leachate or carrying out evaporation treatment by utilizing heat of flue gas at the tail of the flue.
Further, the furnace flue gas discharge pipeline of the flue gas treatment system 7 and/or the steam extraction pipeline of the steam turbine 3 are communicated with the garbage storage pit 20 through a drying pipe 15.
Further, the system also comprises a steam flow and power generation amount calculation unit 16, wherein the steam flow and power generation amount calculation unit 16 is arranged on the steam connecting pipe 9 and is used for detecting the flow, the temperature and the pressure of the steam flowing through the steam connecting pipe 9 and calculating the power generation amount generated by the steam generated by the waste incineration boiler doing work in the steam turbine according to the detected flow, temperature and pressure of the steam and the position of the steam turbine.
Further, an activated carbon adsorption or filtration device 17 is arranged on the waste incineration boiler smoke discharge connecting pipe 13.
Example 2
The embodiment provides an operation method of a thermal power plant coupled waste incineration power generation system as described in embodiment 1, and as shown in fig. 2, the method includes the following steps:
the flue gas of the waste incineration boiler 1 and the power station boiler 2 purified by the flue gas treatment system 7 and/or the extracted steam of the steam turbine 3 are/is used as heat sources to dry the waste fuel in the waste storage pit 20, and the dried waste fuel is conveyed into the waste incineration boiler 1 through a conveying device for incineration;
conveying boiler feed water of the power station boiler 2 and/or condensed water of the steam turbine 3 into the waste incineration boiler 1 through a feed water pipeline 14 to provide a water source for generating steam by incineration of the waste incineration boiler 1;
the steam generated by the power station boiler 2 is heated by a heater 5 and then enters the steam turbine 3 through a main steam pipeline 8, and the steam generated by the waste incineration boiler 1 enters the steam turbine 3 through a steam connecting pipe 9;
selecting an access point for steam to enter the steam turbine 3 according to the pressure and temperature of the steam generated by the combustion of the waste incineration boiler 1 and the power station boiler 2; when the temperature of the steam in the steam turbine 3 is reduced, the steam is sent into the reheating cold section steam connecting pipe according to the temperature and the pressure of the steam, and the steam enters the steam turbine 3 again from the reheating hot section steam connecting pipe 10 after being heated by the reheater 12, so that acting power is provided for the steam turbine 3;
the steam flow and power generation amount calculation unit 16 measures the steam flow, temperature and pressure generated by the waste incineration boiler 1; calculating the generated energy generated by the steam generated by the waste incineration boiler acting in the steam turbine according to the detected flow, temperature and pressure of the steam and the position of the steam introduced into the steam turbine;
flue gas after the incineration of the waste incineration boiler 1 enters the flue gas treatment system 7 through the waste incineration boiler smoke discharge connecting pipe 13 and is mixed and purified with flue gas generated by the combustion of the power station boiler 2.
Example 3
The embodiment provides a carbon emission reduction method using a thermal power plant coupled waste incineration power generation system, and by using the thermal power plant coupled waste incineration power generation system described in embodiment 1 and the operation method described in embodiment 2, the waste incineration boiler 1 at least partially replaces steam generated by the power plant boiler 2 to enter the steam turbine 3 to drive the generator to generate electricity, the amount of electricity generated by the part of steam is converted into the amount of coal fired according to the power generation efficiency of the thermal power plant, and the carbon emission amount which can be generated by the part of coal fired is the carbon emission reduction amount generated by the waste incineration boiler 1; the specific calculation method of the carbon emission reduction amount is as follows:
the steam flow and power generation amount calculation unit 16 measures the steam flow, temperature and pressure generated by the waste incineration boiler 1; calculating the generated energy generated by the steam generated by the waste incineration boiler acting in the steam turbine according to the detected flow, temperature and pressure of the steam and the position of the steam introduced into the steam turbine;
calculating the amount of substitute coal according to the generated energy of the steam generated by the waste incineration boiler 1; and calculating the carbon emission reduction amount generated by the waste incineration boiler 1 according to the quantity of the alternative coal.
Example 4
The steam entering the steam turbine 3 has different temperature and pressure, so that the steam turbine 3 is distributed in a trapezoidal shape from high to low, and the steam does work in the steam turbine 3 step by step. After the coal in the power station boiler 2 is combusted, the steam and the water are separated by the steam drum 4, and the obtained steam is further heated by the superheater 5. The temperature and pressure are highest because the steam generated by the combustion of the utility boiler 2 is the main steam. The induction device arranged at the access point of the high-pressure cylinder of the steam turbine can acquire the temperature and pressure range of the steam generated by the power station boiler 2, and at the moment, the valve at the access point of the high-pressure cylinder can be opened. The steam generated by the utility boiler 2 enters the high-pressure cylinder of the steam turbine 3 along the main steam pipeline 8 and the high-pressure cylinder access point to do work. The steam generated by the waste incineration boiler 1 may directly enter the steam turbine 3, and enter the inlet of the intermediate pressure cylinder or the low pressure cylinder of the steam turbine 3 according to the parameters of the steam, such as pressure, temperature, superheat degree, etc., and may enter the inlet of the intermediate pressure cylinder of the steam turbine 3 after being reheated by the reheater 12 if the temperature is not sufficient. If the temperature and pressure range of the steam directly generated by the waste incineration boiler 1 is suitable for directly entering a low-pressure cylinder of a steam turbine to do work, the waste incineration boiler 1 can also be directly connected to an inlet of the low-pressure cylinder of the steam turbine through a steam connecting pipe.
Set up the counter-current valve on main steam line 8, steam connecting pipe 9, reheat hot section steam connecting pipe 10 and reheat cold section steam connecting pipe 11, prevent the steam backward flow, improve the security of device.
Example 5
When the thermal power plant coupled waste incineration power generation system as described in embodiment 1 contains a large amount of moisture, the waste fuel needs to be dried and then incinerated. The heat source of the garbage drying treatment is steam generated after the garbage incineration boiler 1 incinerates, main steam generated by the power station boiler 2 or extraction steam of the steam turbine 3, or high-temperature flue gas of the power station boiler 2, the flue gas of the power station boiler is conveyed to a garbage storage pit or a heat exchange interface through a heat-insulating connecting pipeline and can be used as a drying heat source to dry moisture in the garbage, so that a sufficient drying heat source is provided for garbage fuel, the operation cost of drying equipment is effectively reduced, the moisture content of the garbage is reduced, the dryness requirement before the garbage enters the incineration boiler is met, and the combustion efficiency of the garbage incineration boiler is improved.
Example 6
In the thermal power plant coupled waste incineration power generation system described in embodiment 1, the waste leachate is sent to a furnace of a boiler of a power plant for incineration and evaporation, or sent to an evaporation treatment device 19 at the tail of a flue 21 and in front of a flue gas treatment system 7 for evaporation, and the remaining sulfur-containing, nitrate-containing and dust-containing flue gas enters a desulfurization, denitrification and dust removal device of the boiler for treatment.
Example 7
In the thermal power plant coupled waste incineration power generation system according to embodiment 1, after the power plant boiler 2 is combusted, water and steam are separated through the steam drum 4, high-temperature steam is used for enabling the steam turbine 3 to do work or generate power, and water obtained after separation can flow into the waste incineration boiler 1 along the water supply pipeline 14 after being heated by the economizer 6. The water can provide a water source for generating steam by burning the waste incineration boiler 1, and the water heated by the economizer 6 is preheated before entering the waste incineration boiler 1, so that the generation of the steam is facilitated. After the steam turbine 3 finishes acting or generating power, the steam can convey condensed water into the waste incineration boiler 1 along the water supply pipeline 14 through the condensation function of the condenser. The feed water of the utility boiler 1 and the condensed water of the steam turbine 3 may provide a source of water for the combustion of the waste incineration boiler 1 to generate steam.
Example 8
One end of the waste incineration boiler smoke discharge connecting pipe 13 is communicated with the waste incineration boiler 1, the other end of the waste incineration boiler smoke discharge connecting pipe can be communicated with the flue 21, and the communication point is arranged in front of the economizer 6 and the air preheater or the smoke treatment system 7. The flue gas heat discharged by the waste incineration boiler 1 is used for heating boiler feed water in an economizer, is used for heating air in an air preheater or ensures that the temperature of an SCR inlet of flue gas entering a flue gas treatment system 7 is above 310 ℃.
Example 9
Steam generated by the waste incineration boiler is sent to a reheater or a certain stage of a steam turbine through a steam connecting pipeline to do work. And a steam flow and power generation amount calculation unit is arranged on the steam communication pipeline, measures the steam flow, temperature and pressure generated by the waste incineration boiler, and calculates the power generation amount generated by the working of the steam generated by the waste incineration boiler in the steam turbine according to the detected steam flow, temperature and pressure and the position of the steam turbine introduced into the steam turbine.
Example 10
This embodiment specifically describes a method for calculating the corresponding carbon emission reduction according to the steam flow, pressure, temperature generated by the waste incineration boiler 1, and the enthalpy value and exhaust enthalpy value entering the steam turbine 3.
The method comprises the following steps of utilizing the waste incineration boiler 1 to replace steam generated by burning coal of the power station boiler 2 to enter a steam turbine 3 to drive a generator to generate power, converting generated energy generated by the part of steam into coal burning quantity according to the power generation efficiency of the thermal power plant, and obtaining carbon emission quantity generated by the part of coal burning quantity, namely carbon emission reduction quantity generated by the waste incineration boiler 1, wherein the specific calculation steps, formulas and methods are as follows:
step 1: the steam generated by the waste incineration boiler enters the generating capacity of a steam turbine:
Praw steam＝DRaw steam*[(hRaw steam 0-hExhaust steam)/3600]*ηe
＝DRaw steam*[(hRaw steam 0-hExhaust steam)/3600]*ηi*ηm*ηg
Wherein P isRaw steamThe power generation amount of steam generated by the waste incineration boiler entering a steam turbine is kW;
Draw steamThe steam amount (kg/h) is the amount of steam which is used for applying work when the steam generated by the waste incineration boiler enters a steam turbine;
hraw steam 0An inlet enthalpy value kJ/kg of steam generated by the waste incineration boiler entering a steam turbine;
hexhaust steamThe enthalpy value kJ/kg of exhaust steam generated by the waste incineration boiler after the steam enters a steam turbine to do work;
ηefor absolute electrical efficiency of the unit, ηe＝ηi*ηm*ηg；
ηiFor internal efficiency of steam turbines ηmFor mechanical transmission efficiency of steam turbine ηgTo the generator efficiency;
step 2: according to PRaw steamCorrespondingly calculating the corresponding standard coal fuel consumption of the thermal power generating unit, namely if the thermal power generating unit realizes the generating capacity value PRaw steamThe calculation formula of the standard coal amount required by the boiler of the thermal power generating unit is as follows:
Dmarking coal＝PRaw steam*bcp＝PRaw steam*[3600/(q1*ηb*ηp*ηe]
Wherein DMarking coalMarking the combustion amount of coal for the power station boiler which needs to be consumed correspondingly, kg/h;
Praw steamThe power generation amount of steam generated by the waste incineration boiler entering a steam turbine is kW;
bcpthe coal consumption rate of the whole thermal power plant is kg/(kWh);
q129270kJ/kg which is the lower calorific value of standard coal;
ηbfor boiler efficiency ηpFor pipeline efficiency;
ηefor absolute electrical efficiency of the unit, ηe＝ηi*ηm*ηg；
And step 3: burning DMarking coalIs a pair ofCorresponding CO2Discharge capacity:
according to the related data service channel: CO produced by complete combustion of 1 ton of standard coal2The carbon emission coefficient (unit: ton carbon/ton standard coal (tc/tce)) is: the recommended value of the national institute of energy and reform committee is 0.67, the reference value of the japan institute of energy and economy is 0.68, and the reference value of the energy information service of the U.S. department of energy is 0.69. We tentatively calculated the "carbon emission coefficient" of 1kg of standard coal to be 0.67.
I.e. carbon emission ECO2＝DMarking coal*0.67*0.001。
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.

Claims (10)

1. A thermal power plant coupling waste incineration power generation system comprises a power station boiler (2) and a steam turbine (3), wherein a main steam pipeline (8) of the power station boiler (2) is communicated with the steam turbine (3); the power station boiler comprises a steam drum (4), a superheater (5), an economizer (6), a flue (21) and a flue gas treatment system (7), wherein the steam drum (4), the superheater (5), the economizer (6), the flue (21) and the flue gas treatment system (7) are communicated in sequence; the method is characterized in that: still include msw incineration boiler (1), msw incineration boiler (1) is including pan feeding mouth, steam outlet, exhanst gas outlet, slag discharge port, the pan feeding mouth passes through waste conveyor and connects in rubbish storage pit (20), steam outlet with the steam input port of steam turbine (3) is linked together, the exhanst gas outlet through msw incineration boiler exhaust fume connecting pipe (13) with flue (21) are linked together.
2. The thermal power plant coupled waste incineration power generation system of claim 1, wherein: the steam outlet of the waste incineration boiler (1) is communicated with the steam turbine (3) through a steam connecting pipe (9), and/or is communicated with the steam turbine (3) through a reheating hot section steam connecting pipe (10) through a reheater (12).
3. The thermal power plant coupled waste incineration power generation system of claim 1, wherein: and a boiler water feeding pipeline of the power station boiler (2) and/or a condensate pipeline of the steam turbine (3) are/is communicated with the waste incineration boiler (1) through a water feeding pipeline (14).
4. The thermal power plant coupled waste incineration power generation system of claim 1, wherein: one end of the waste incineration boiler smoke discharge connecting pipe (13) is communicated with a smoke outlet of the waste incineration boiler (1), the other end of the waste incineration boiler smoke discharge connecting pipe is communicated with a flue (21), and the communicating point is arranged in front of the coal economizer (6) or the smoke treatment system (7).
5. The thermal power plant coupled waste incineration power generation system of claim 1, wherein: and a leachate outlet of the garbage storage pit is communicated with a hearth of the power station boiler (1) or an evaporation treatment device (19) arranged at the tail of the flue (12) and in front of the flue gas treatment system (7), and is used for carrying out incineration evaporation treatment or flue tail evaporation treatment on leachate.
6. The thermal power plant coupled waste incineration power generation system of claim 1, wherein: and a furnace flue gas discharge pipeline of the flue gas treatment system (7) and/or a steam extraction pipeline of the steam turbine (3) are communicated with the garbage storage pit (20) through a drying pipe (15).
7. The thermal power plant coupled waste incineration power generation system according to claim 2, further comprising a steam flow and power generation amount calculation unit (16), wherein the steam flow and power generation amount calculation unit (16) is arranged on the steam connecting pipe (9) and is used for detecting the flow, the temperature and the pressure of the steam flowing through the steam connecting pipe (9) and calculating the power generation amount generated by the steam generated by the waste incineration boiler doing work in the steam turbine according to the detected flow, the detected temperature and the detected pressure of the steam and the position of the steam turbine introduced into the steam turbine.
8. The thermal power plant coupled waste incineration power generation system according to claim 1, wherein the waste incineration boiler smoke exhaust connecting pipe (13) is provided with an activated carbon adsorption or filtration device (17).
9. An operation method of the thermal power plant coupled waste incineration power generation system according to any one of claims 1 to 8, characterized by comprising: the method comprises the following steps:
furnace flue gas purified by the flue gas treatment system (7) of the waste incineration boiler (1) and the power station boiler (2) and/or steam extracted by the steam turbine (3) are used as heat sources to dry the waste fuel in the waste storage pit, and the dried waste fuel is conveyed into the waste incineration boiler (1) through a conveying device to be incinerated;
conveying boiler feed water of the power station boiler (2) and/or condensed water of a steam turbine (3) into the waste incineration boiler (1) through a feed water pipeline (14) to provide a water source for generating steam by incineration of the waste incineration boiler (1);
the steam generated by the power station boiler (2) is heated by a heat device (5) and then enters the steam turbine (3) through a main steam pipeline (8), and the steam generated by the waste incineration boiler (1) enters the steam turbine (3) through a steam connecting pipe (9);
selecting an access point for steam to enter the steam turbine (3) according to the pressure and temperature of the steam generated by the combustion of the waste incineration boiler (1) and the power station boiler (2); when the temperature of the steam in the steam turbine (3) is reduced, the steam is sent into the reheating cold section steam connecting pipe (11) according to the temperature and the pressure of the steam, and the steam enters the steam turbine (3) again from the reheating hot section steam connecting pipe (10) after being heated by the reheater (12) so as to provide work power for the steam turbine (3);
the steam flow and power generation amount calculating unit (16) measures the steam flow, temperature and pressure generated by the waste incineration boiler (1); calculating the generated energy generated by the steam generated by the waste incineration boiler acting in the steam turbine according to the detected flow, temperature and pressure of the steam and the position of the steam introduced into the steam turbine;
the flue gas after the incineration of the waste incineration boiler (1) enters the flue gas treatment system (7) through the waste incineration boiler smoke exhaust connecting pipe (13), and the flue gas generated by the combustion of the power station boiler (2) is mixed and purified.
10. A carbon emission reduction method using a thermal power plant coupled waste incineration power generation system is characterized in that: by adopting the thermal power plant coupled waste incineration power generation system as defined in any one of claims 1 to 8 and the operation method as defined in claim 9, the waste incineration boiler (1) at least partially replaces the steam generated by the utility boiler (2) to enter the steam turbine (3) to drive the generator to generate electricity, the generated energy generated by the part of steam is converted into the coal-fired quantity according to the electricity generation efficiency of the thermal power plant, and the carbon emission quantity which can be generated by the part of coal-fired quantity is the carbon emission reduction quantity generated by the waste incineration boiler (1); the specific calculation method of the carbon emission reduction amount is as follows:
the steam flow and power generation amount calculating unit (16) measures the steam flow, temperature and pressure generated by the waste incineration boiler (1); calculating the generated energy generated by the steam generated by the waste incineration boiler acting in the steam turbine according to the detected flow, temperature and pressure of the steam and the position of the steam introduced into the steam turbine;
calculating the amount of substitute coal according to the generated energy of the steam generated by the waste incineration boiler (1); and calculating the carbon emission reduction amount generated by the waste incineration boiler (1) according to the quantity of the alternative coal.
CN202010150450.4A 2020-03-06 2020-03-06 Thermal power plant coupled waste incineration power generation system and method Withdrawn CN111322621A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111780126A (en) * 2020-06-24 2020-10-16 中国能源建设集团广东省电力设计研究院有限公司 Flue gas treatment system and method of solid incinerator coupled generator set
CN113946789A (en) * 2021-11-17 2022-01-18 西安热工研究院有限公司 Method for calculating waste incineration amount of four-furnace three-machine waste incineration power plant in real time
CN114626734A (en) * 2022-03-22 2022-06-14 光大环境科技（中国）有限公司 Method for evaluating carbon emission of waste incineration power plant

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111780126A (en) * 2020-06-24 2020-10-16 中国能源建设集团广东省电力设计研究院有限公司 Flue gas treatment system and method of solid incinerator coupled generator set
CN111780126B (en) * 2020-06-24 2023-01-03 中国能源建设集团广东省电力设计研究院有限公司 Flue gas treatment system and method of solid incinerator coupling generator set
CN113946789A (en) * 2021-11-17 2022-01-18 西安热工研究院有限公司 Method for calculating waste incineration amount of four-furnace three-machine waste incineration power plant in real time
CN113946789B (en) * 2021-11-17 2024-03-12 西安热工研究院有限公司 Method for calculating garbage incineration amount of four-furnace three-machine garbage incineration power plant in real time
CN114626734A (en) * 2022-03-22 2022-06-14 光大环境科技（中国）有限公司 Method for evaluating carbon emission of waste incineration power plant

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Application publication date: 20200623