CN103939912B - Dry-process rotary kiln associated treatment is containing wet refuse bypass electrification technique as well as and system - Google Patents

Abstract

Dry-process rotary kiln collaborative treatment of wet waste bypass power generation technology and system, this process is to feed wet waste into the C5 feeding pipe, and use the high temperature and strong alkali powder in the C5 feeding pipe to quickly dry and alkalize the waste, dry and flammable The garbage enters the kiln tail smoke chamber with the powder and quickly gasifies and burns. The high-temperature steam and combustion exhaust gas generated by the combustion are drawn into the bypass settling flue, and are treated by the bypass settling flue and mixed with the waste heat of the grate cooler head exhausted by the bypass fan. After adjusting the air volume and air temperature, the steam boiler is used to generate steam power for power generation; the unburned garbage and burnt ash are sent to the rotary kiln with the raw meal powder to be calcined as clinker; the unburned hydrocarbons are Rise to the decomposition furnace to continue burning. The present invention also includes the bypass power generation system for the co-processing of wet garbage by the dry-process rotary kiln. The invention can solve the problems of the impact of urban household garbage on the kiln condition and the increase of coal consumption, and effectively eliminate the problem of sticking and blocking of the kiln system caused by moisture in the garbage and chlor-alkali.

Description

Bypass power generation process and system for dry-process rotary kiln co-processing of wet waste

technical field

The invention relates to a power generation process and system for incinerating urban domestic waste, in particular to a power generation process and system for drying and incinerating wet urban domestic waste in dry rotary kiln production.

Background technique

Domestic waste incineration power generation technology has reached maturity, but one investment is large. Even if the imported technology is digested and absorbed by domestically produced equipment lines with mature large-scale treatment of waste, the investment is still 400,000 to 600,000 yuan/ton. Equipment, large-scale treatment of the most stable, high calorific value of domestic waste incineration power generation unit investment per kWh still reaches 10,000-20,000 yuan/kWh, which is much higher than coal power investment of 7,000 yuan/kWh, and oil must be burned Ignition or combustion-supporting; second, it is very adaptable to small-scale or very small-scale domestic waste such as below 150 tons/day, with large fluctuations in composition, low calorific value, and high moisture. Poor, usually have to add coal fuel injection combustion, and its economic efficiency is extremely poor; third, it must face toxic and harmful substances such as garbage ash, fly ash, leachate, heavy metals, dioxins, etc. Produce secondary pollution; moreover, the self-consumption is high, the most advanced system is theoretically 8%, and the actual amount is 12-15%. Based on these actual conditions, my country's waste incineration power generation is actually an embellishment of the policies of large and medium-sized cities and the operation of interests.

In terms of dry rotary kiln co-processing of domestic waste, domestic powerful cement group enterprises such as BBMG, Conch, Huaxin, China Resources, and Taiwan Cement have introduced or learned from Denmark, Sweden, Germany, Japan and other foreign technical experience. After years of development and application, great achievements have been made, and their own characteristic processes and equipment have been formed, but their basic process routes can be summarized into two types. The first one is to use the high wind temperature waste heat of the grate cooler in the cement plant Use a professional waste incinerator system to incinerate waste first and provide exhaust gas purification facilities. The ash after waste incineration is used as ingredients in cement production to achieve collaborative processing; The waste heat is connected to the professional waste incinerator system, or a drying system using the waste heat of the waste gas from the grate cooler is added. The waste gas from waste treatment enters the kiln system, and the ash is used for batching in cement production to achieve coordinated processing. Practice has proved that: the first process route basically has no effect on the production of dry-process rotary kiln, but the investment is large, and the daily investment of processing 300-400 tons of waste is as high as hundreds of millions of yuan; Relatively small, the daily investment of processing 300-400 tons of waste still amounts to 80-120 million yuan. Wet exhaust gas entering the kiln system will affect the working conditions of the kiln system and increase the heat consumption of clinker. And because the high wind temperature waste heat of the grate cooler is used, it has a slight impact on the cement kiln waste heat power generation. To a certain extent, these two types of co-processing methods of garbage processing have been questioned by the industry as not suitable for China's national conditions. Therefore, there is an urgent need for a process and system for cooperating waste disposal that has wide adaptability, low investment, does not affect kiln conditions, and does not increase clinker and coal consumption.

On the other hand, the cement kiln waste heat power generation technology, which utilizes the 320-350°C exhaust gas discharged from the kiln head clinker cooler (about 450°C) and the kiln tail preheater to recover waste heat, has been very mature and popular, but it is not yet possible to use grate The cooling head discharges a large amount of low-temperature exhaust gas waste heat, and because the power station is parasitic on cement production, the power generation process is different from cement production. Cement production is a straight line, so it can be transformed in sections, that is, there is a lot of room for improvement and transformation , and the power generation process is a closed circle, coupled with the limitation that steam turbines and generators cannot be upgraded and modified, except for process problems and problematic equipment, once the power station is completed and put into operation, there is no possibility of its production improvement and transformation. That is: under the assumption that the cement kiln can be transformed to co-process waste and can make full use of waste heat to increase power generation, the original waste heat power generation system cannot increase the designed power generation capacity. There is a rated limit for the exhaust air volume of the fan, and the grate cooler at the kiln head is also limited. The power generation capacity of the power generation system selected according to the limited high-temperature exhaust gas of the grate cooler at the kiln head and the exhaust gas extracted by the high-temperature fan at the kiln tail is also limited. On the other hand, even if it is assumed that the garbage generates additional exhaust gas waste heat in the kiln system, it can neither increase the exhaust gas waste heat extracted by the high-temperature fan, nor increase the designed power generation. On the contrary, the moisture contained in the garbage will affect the kiln. The combustion of the two internal fires will increase the coal consumption, and the low-temperature garbage and water will seriously affect the temperature of the kiln and the furnace temperature, affecting the combustion of coal powder, and the excessive water vapor passing through the preheater powder will also make the powder fluidity significantly Sticking caused by deterioration (technical personnel in the industry and related papers habitually believe that the chlor-alkali in the garbage causes sticking, the volatile condensation point of chlor-alkali is about 700°C, and the preheater system is in the 3rd and 4th stage preheater area, and the chlor-alkali in garbage mainly comes from kitchen waste. In fact, domestic kitchen waste has basically been used for feeding or processed into high-value-added oil. The impact of chlor-alkali in domestic waste in my country is actually very limited. This has been confirmed by chemical analysis and analysis. proved by practice).

Obviously, there is an urgent need for a new process and system to solve the problem that cement kilns can co-process waste and make full use of waste to generate electricity.

Contents of the invention

The technical problem to be solved by the present invention is to provide a dry-process rotary kiln co-processing wet garbage bypass power generation process and system, which can solve the impact of urban domestic garbage on kiln conditions and coal consumption. Increase the problem, effectively eliminate the problem of sticking and clogging of the kiln system caused by moisture in the garbage and chlor-alkali, and can generate excessively stable 1000-1200 ℃ high-temperature waste gas waste heat for stable power generation without affecting the original waste heat power generation system, completely eliminating waste slag and waste gas , waste water and toxic and harmful substances discharge, and it is suitable for domestic waste of different scales and characteristics in cities, counties and towns, with small investment and good economy.

The technical solution adopted by the present invention to solve its technical problems is:

In the dry-process rotary kiln cooperative treatment of wet garbage bypass power generation process of the present invention, the C5 feeding pipe of the cone of the C5 cyclone preheater at the bottom of the dry-process rotary kiln preheater system is used as a preheating dryer for garbage, and The high-temperature strong alkaline powder mainly containing CaO flowing in the C5 feeding pipe is used as the preheating drying medium, and the pretreated wet garbage is fed into the C5 feeding pipe through the garbage feeding lock air device, and the C5 feeding pipe is used to The high-temperature powder mainly containing CaO quickly dries and alkalizes the garbage, and the 850-950°C high-temperature powder wrapped in the garbage vaporizes the water in the garbage into high-temperature steam; the dry and flammable garbage enters the kiln tail smoke chamber with the powder, Rapid gasification and combustion in the atmosphere of 1000-1200 ℃ underpinning high-temperature field, the large amount of incremental high-temperature steam and combustion exhaust gas generated by combustion are sucked into the bypass settling flue, treated by the bypass settling flue and mixed into the grate cooler by the bypass fan After the air volume and air temperature are adjusted by the waste heat of exhaust gas exhausted from the machine head, the steam boiler generates steam power to drive the steam turbine, and the steam turbine drives the generator to generate electricity; the unburned garbage and burnt ash are completely burned in the rotary kiln with the raw meal powder , the garbage ash mixed in the raw meal powder is calcined into clinker; a small amount of hydrocarbons that have not been burned in time rise to the decomposition furnace and continue to be burned, and the toxic components such as HF, HCl, SO ₂ and so on generated by the decomposition of garbage pass through the kiln The tail smoke chamber and calciner are absorbed and solidified by excess high-activity CaO; the high-temperature fly ash collected by the steam boiler is directly used as cement admixture powder, and the leachate and press filtrate produced in the waste pretreatment are eliminated by the coal mill or vertical mill in cement production Sodium, or as an alternative raw material for denitrification.

The dry method rotary kiln cooperative processing wet garbage bypass power generation system of the present invention includes garbage feeding lock air device, C5 feeding pipe, kiln tail smoke chamber, rotary kiln, decomposition furnace, C5 cyclone preheater, bypass settlement Flue, bypass air valve, bypass fan, steam boiler, steam turbine, generator, water supply and treatment device, grate cooler and head exhaust fan, the garbage feeding air lock device is connected with the C5 feeding pipe, located at C5 Below the flap lock valve of the feeding pipe, the C5 feeding pipe is connected with the kiln tail smoke chamber, the kiln tail smoke chamber is connected with the rotary kiln, and the upper part of the kiln tail smoke chamber is connected with the calciner through the shrinkage. The bypass settling flue is located on the opposite side of the C5 feeding pipe and is connected to the kiln tail smoke chamber. The bypass air valve is connected to the bypass settling flue. The air inlet end of the bypass fan is connected with the head row pipe of the grate cooling machine through the bypass fan air valve, the bypass sinking flue is connected with the steam boiler, the steam boiler is connected with the steam turbine, and the steam turbine It is connected with the generator, and the water supply and treatment device is connected with the steam turbine and the steam boiler.

Further, the bypass settling flue is composed of a flue and an expansion chamber or a cyclone dust collection structure.

In the above technical scheme, the C5 feeding pipe is used as a fast and efficient dryer for garbage, and the high-temperature strong alkaline powder mainly containing CaO flowing in the C5 feeding pipe is used as a preheating drying medium, and the wet garbage is fed through the garbage. The air lock device is fed into the C5 feeding pipe, and in the C5 feeding pipe, the amount is much larger than the amount of garbage and mainly contains CaO, and the temperature reaches 850-950 °C. Drying; the C5 feeding pipe is connected to the kiln tail smoke chamber, and the preheated and dried garbage enters the kiln tail smoke chamber with the powder, and burns in the kiln tail smoke chamber in a high-temperature field atmosphere at the bottom of 1000-1200 °C; the kiln tail smoke chamber Connected with the rotary kiln, the garbage that has not been burned in time and the ash that has been burned out will enter the rotary kiln with the raw meal and be completely burned, and the garbage ash mixed in the raw meal powder will finally be converted into cooked Material composition; the upper part of the kiln tail smoke chamber is connected to the calciner through the shrinkage port, and a small amount of hydrocarbons in the garbage that have not been burned in time rise to the calciner and are completely burned at a high temperature of 900-1200°C in the center of the furnace after a residence time of more than 7s. The HF, HCl, SO ₂ etc. produced by the decomposition in the garbage are all absorbed and solidified into CaCl ₂ , CaF ₂ , CaSO ₄ and other minerals by the excess high-activity CaO; It is installed at the position where the concentration of flour dust and water vapor is relatively high in the C5 feeding pipe. A large amount of steam-containing high-temperature flue gas at 1000-1200 °C generated by waste combustion is extracted through the bypass settling flue, and the coarse dust particles in the flue gas are passed through The treatment of the bypass settling flue flows back into the kiln tail smoke chamber under the action of gravity; the bypass air valve is connected to the bypass settling flue, which is used to cut off and control the bypass air volume, and can be set at the high temperature of the bypass flue depending on the situation. section or low temperature section; the air outlet end of the bypass fan is connected to the bypass flue to adjust the main steam pressure generated by the steam boiler and supplied to the steam turbine; the air inlet end of the bypass fan is connected to the head row pipe of the grate cooler, The waste heat of exhaust gas supports the bottom; the bypass settling flue is connected with the steam boiler, and the low-temperature exhaust gas of the boiler enters the dust removal device of the production line system or the bag or electric bag filter. The steam turbine is connected, and the steam generated by the boiler drives the steam turbine; the steam turbine is connected with the generator, and the power of the steam turbine is supplied to the generator to generate electricity. The above technical solution includes drying, calcination and power generation of wet garbage to form a relatively independent process and system. The power generation of the system is adjusted and controlled by the amount of garbage feeding, bypass high-temperature air valve, and bypass fan, and the original cement kiln waste heat The power generation system has no conflict and no interference.

Technical principle of the present invention:

(1) Use several times to dozens of times of CaO-based high-temperature strong alkaline fluidity powder in the restricted space to enclose mixed and dry wet garbage, so that the moisture in the garbage is expanded into high-temperature steam, and the alkali garbage;

(2) Use the local space at 1000-1200°C to underpin the temperature field atmosphere to calcinate and dry combustible garbage, and use the high temperature of 900-1200°C in the decomposition furnace to completely burn out a small amount of carbon that rises from the local space below without burning out in time Hydrogen compounds, using the excess high-activity CaO in the decomposition furnace and smoke chamber to completely absorb toxic and harmful substances such as HF, HCl, SO ₂ , and eliminating the conditions for the generation of dioxins, using the high temperature in the rotary kiln to mix the dioxin The limited inorganic substances in the garbage are converted into clinker components and solidify heavy metal elements;

(3) Utilize the dust and water vapor concentration in the kiln tail smoke chamber, the large difference in the distribution of chlor-alkali concentration and the characteristics of suction, and borrow the traditional principle of venting to deal with the hazards of chlorine-alkali sulfur, in a suitable position (different smoke chamber structures are different) Extract the large incremental high-temperature (1000-1200°C) steam and combustion exhaust gas generated by wet garbage, and solve the problem of ventilation in the rotary kiln and coal in the kiln caused by moisture in the garbage, combustion exhaust gas of organic matter and possible chlor-alkali components. The adverse effects of pulverized coal combustion and the adverse effects on the combustion of pulverized coal in the decomposition kiln are beneficial to the kiln system to increase production and save coal;

(4) Eliminate the impact of garbage entering the kiln on the working conditions and production capacity of the kiln system by setting up the bypass settling flue, bypass air valve and bypass fan, and control and adjust the power generation, and use the waste heat of the head exhaust fan (currently Cement kiln waste heat power generation system cannot be used) to stabilize kiln conditions and maximize bypass power generation benefits;

(5) Properly strengthen the first fire at the kiln head to ensure the stability of the kiln tail and the temperature field of the smoke chamber, so as to achieve the effect of increasing production, improving quality and strengthening bypass power generation;

(6) Utilize the residual heat of the waste gas from the head of the grate cooler, which cannot be used by the waste heat power generation system of the cement kiln, to increase the bypass power generation capacity of the co-processing of waste.

The present invention uses strong alkaline high-temperature powder to quickly dry and alkalize garbage, support bottom high-temperature field to calcinate garbage, and controllable bypass power generation system has significant advantages, and its beneficial effects are as follows:

(1) The process is simple and reliable, and it can be treated with individualized plans, adapting to the characteristics of large fluctuations in the composition, calorific value and moisture content of urban domestic waste in different regions of my country, and can be adapted to local conditions. It can handle different types of garbage and garbage with different characteristics, such as wet material, bulk material, and granular garbage. Different garbage items can adopt personalized collaborative processing power generation design schemes;

(2) The process is flexible and the investment is small. Because it can handle different types of waste with different properties, it can greatly simplify the waste pretreatment process and equipment, and does not require special waste drying equipment, special waste incinerator equipment, and complicated Ash, fly ash, toxic and harmful waste gas treatment system does not even need to be equipped with a separate waste gas dust removal system, and the production line fan can be used to solve the bypass draft depending on the situation, so the investment is small; the amount of waste processed by a single dry rotary kiln line can be reduced from the daily It has good investment economy for treating wastes of different sizes from 50 tons to 2000 tons;

(3) High thermal efficiency, large power generation, and good economy. According to the characteristics of the dry rotary kiln system process and equipment local area, the high-temperature powder is used to dry and alkalize the garbage in the C5 feeding tube, and the high-temperature field is used to calcine and dry the waste. The garbage can make full use of the calorific value of urban domestic garbage, and can generate a stable high wind temperature of 1000-1200 ℃, which can ensure that the independent waste incineration steam turbine generator set has a stable high main steam pressure and a high heat conversion rate. The stable 1000-1200℃ high-temperature field and high wind temperature can generate doubled electric energy compared with specialized waste incinerators, which has good economical efficiency;

(4) The self-consumption is small, and there is no interference with the original waste heat power generation. Because there is no need for professional garbage drying and incinerator systems, the existing environmental protection dust removal system of the dry rotary kiln line can also be used, and no special ash and sewage are required. The treatment system, waste treatment power generation system has low self-consumption, and there is no conflict or interference with the waste heat of grate cooler and preheater exhaust gas collected by the original cement kiln waste heat power generation system;

(5) No increase in clinker coal consumption, and it is expected to achieve zero power consumption in clinker production; because the bypass system timely discharges most of the water, chlor-alkali sulfur and incremental waste gas from the garbage entering the kiln, there are two fires for the kiln system and the kiln The working conditions of the furnace have no adverse effects, and clinker production does not increase additional power consumption and coal consumption, but is conducive to increasing production; the original cement kiln waste heat power generation per ton of clinker power generation is 30-45 degrees, and the garbage bypass power generation is 20-40 degrees ( depending on the amount of waste) is expected to meet the power consumption of clinker production and realize zero consumption of external power for clinker production;

(6) Garbage treatment achieves zero discharge of "three wastes". The organic matter in the garbage is decomposed and burned in the kiln system at 1000-1700°C, and the chlorine, fluorine, and sulfur produced by pyrolysis are directly absorbed by the strong alkaline calcium oxide. Conditions for the generation of toxic and harmful gases such as dioxins; the inorganic substances in the garbage are directly converted into clinker components, and heavy metals are also solidified in the clinker; the leached filtrate of the garbage can be used for coal mills or vertical mills for consumption, or used as Alternative raw materials for denitrification;

(7) It can effectively promote the "four zeros and one negatives" of the sustainable development strategy of the cement industry, that is, cement enterprises completely realize zero pollution to the surrounding ecological environment, zero consumption of external electric energy for clinker production, and zero consumption of waste, waste residue, and waste water. Zero emissions, zero consumption of natural fossil fuels, and negative growth of waste in the whole society.

Description of drawings

Fig. 1 is a schematic structural view of a bypass power generation system for dry rotary kiln cooperative treatment of wet waste according to an embodiment of the present invention;

In the figure: 1-garbage feeding lock air device; 2-C5 feeding pipe; 3-kiln tail smoke chamber; 4-rotary kiln; 5-calciner; 6-bypass settling flue; ;8-bypass fan; 9-steam boiler; 10-steam turbine; 11-generator; 12-water treatment device; 13-C5 cyclone preheater; -head exhaust fan; 17-bypass fan damper; 18-original waste heat power generation system; 19-grate cooler.

detailed description

In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

In this embodiment, the dry-process rotary kiln cooperative treatment of wet garbage bypass power generation technology uses the C5 feeding pipe at the cone of the C5 cyclone preheater at the bottom of the dry-process rotary kiln preheater system as a preheating dryer for garbage. The high-temperature strong alkaline powder mainly containing CaO flowing in the C5 feeding pipe is used as the preheating drying medium, and the pretreated wet garbage is fed into the C5 feeding pipe through the garbage feeding lock air device, and the C5 feeding The high-temperature powder mainly containing CaO in the tube quickly dries and alkalizes the garbage, and the 850-950 °C high-temperature powder encased in the garbage vaporizes the water in the garbage into high-temperature steam; the dry and flammable garbage enters the smoke chamber at the end of the kiln with the powder , rapid gasification and combustion in the atmosphere of 1000～1200℃ underpinning high-temperature field, the large amount of incremental high-temperature steam and combustion exhaust gas generated by combustion are sucked into the bypass settling flue, and are processed by the bypass settling flue and mixed into the grate by the bypass fan After the air volume and air temperature are adjusted by the waste heat of the exhaust gas from the cold head, the steam boiler generates steam power to drive the steam turbine, and the steam turbine drives the generator to generate electricity; the garbage that has not been burned in time and the burnt ash are sent into the rotary kiln with the raw meal powder for complete combustion The garbage ash mixed in the raw meal powder is calcined into clinker; a small amount of hydrocarbons that have not been burned in time rise to the decomposition furnace and continue to be burned, and the toxic components such as HF, HCl, and SO ₂ produced by garbage decomposition are passed through The kiln tail smoke chamber and the calciner are absorbed and solidified by excess high-activity CaO; the high-temperature fly ash collected by the steam boiler is directly used as cement admixture powder, and the leached filtrate produced in the waste pretreatment is used as coal mill or vertical mill in cement production consumption, or as an alternative raw material for denitrification.

As shown in Figure 1, it is a schematic diagram of the structure of the bypass power generation system for the dry-process rotary kiln co-processing of wet waste.

The dry method rotary kiln cooperative processing wet garbage bypass power generation system in this embodiment includes garbage feeding lock air device 1, C5 feeding pipe 2, kiln tail smoke chamber 3, rotary kiln 4, decomposition furnace 5, bypass settlement Flue 6, bypass air valve 7, bypass fan 8, steam boiler 9, steam turbine 10, generator 11, water supply and treatment device 12, C5 cyclone preheater 13, grate cooler 19 and head exhaust fan 16, all The garbage feeding air lock device 1 is connected with the C5 feeding pipe 2, and is located below the flap air lock valve 14 of the C5 feeding pipe 2. The C5 feeding pipe 2 is connected with the kiln tail smoke chamber 3, and the kiln tail The smoke chamber 3 is connected with the rotary kiln 4, the upper part of the kiln tail smoke chamber 3 is connected with the calciner 5 through the shrinkage 15, and the bypass settling flue 6 is located opposite to the C5 feeding pipe 2 (the dust concentration in this position is low, The water vapor concentration is relatively high) (there are differences in the positions of different smoke chambers), and it is connected to the kiln tail smoke chamber 3, the bypass air valve 7 is connected to the bypass settling flue 6, and the bypass fan The air outlet end of 8 is connected with the bypass settling flue 6, and the air inlet end of the bypass fan 8 is connected with the head row pipeline of the grate cooler 19 through the bypass fan air valve 17, and the bypass settling flue 6 is connected with the The steam boiler 9 is connected, the steam boiler 9 is connected with the steam turbine 10 , the steam turbine 10 is connected with the generator 11 , and the water supply device 12 is connected with the steam turbine 10 and the steam boiler 9 .

The bypass settling flue 6 is composed of a flue and an expansion chamber. The expansion bin can also be replaced by a cyclone dust collection structure and the like.

In the above technical solution, the garbage feeding air lock device 1 is connected to the C5 feeding pipe 2, and is arranged under the flap lock valve 14 of the C5 feeding pipe 2, and the C5 feeding pipe 2 is used as a fast and efficient dryer for garbage. The high-temperature and strong alkaline powder mainly containing CaO flowing in the C5 feeding pipe 2 is used as the drying medium of the garbage, and the wet garbage is fed into the C5 feeding pipe 2 through the garbage feeding and locking device 1, and the material is discharged in the C5 Pipe 2 is wrapped with high-temperature strong alkaline powder with a quantity far greater than the amount of garbage and contains excess CaO, and the temperature reaches 850-950 ° C. Preheating, moisture flash vaporization, drying and alkalization; C5 feeding pipe 2 and kiln The tail smoke chamber 3 is connected, and the preheated and dried garbage enters the kiln tail smoke chamber 3 with the powder, and burns in the kiln tail smoke chamber 3 in an atmosphere of 1000-1200 ° C bottom high-temperature field; the kiln tail smoke chamber 3 and the rotary kiln 4 connected, the ash after the waste is burned and the waste that has not been burned in time enter the rotary kiln 4 with the powder and burn completely, and the waste ash mixed in the raw meal powder is finally converted into clinker components at a high temperature of 1450°C; The upper part of the tail smoke chamber 3 is connected to the calciner 5 through the constriction 15, and a small amount of hydrocarbons in the garbage that have not been burned in time rise to the calciner 5, and are completely discharged in the calciner 5 at a high temperature of 900-1200°C in the center of the calciner 5 for more than 7 seconds. After burning out, the HF, HCl, SO ₂ etc. produced by the decomposition in the garbage are all absorbed and solidified into CaCl ₂ , CaF ₂ , CaSO ₄ and other minerals by excess high-activity CaO; The bypass settling flue 6 is set at the position where the flour dust concentration is relatively low and the water vapor concentration is high relative to the C5 feeding pipe 2, and a large amount of steam-containing high-temperature flue gas at 1000-1200 °C generated by waste combustion is extracted through the bypass settling flue 6. Coarse dust particles in the flue gas are treated by the bypass settling flue 6 and flow back into the kiln tail smoke chamber 3 under the action of gravity; the bypass damper 7 is connected to the bypass settling flue 6 and can be set in the bypass flue The high-temperature end or low-temperature end of the pipe is used to cut off and control the bypass air volume; the air outlet end of the bypass fan 8 is connected to the bypass settling flue 6 to adjust the main steam pressure generated by the steam boiler 9 and supplied to the steam turbine 10 The air inlet end of the bypass fan 8 is connected to the first row of pipelines of the grate cooler 19, and the waste heat of the first exhaust gas is used to support the bottom; the air inlet pipe of the bypass fan 8 is provided with a bypass fan air valve 17; 6 is connected with the steam boiler 9, and the low-temperature exhaust gas from the steam boiler 9 enters the dust removal device of the production line or the electric bag filter, and the fly ash collected by the steam boiler 9 can be used as cement blending powder after being collected by the ash collecting hopper; the steam boiler 9 is connected with the steam turbine 10, The steam from the steam boiler 9 drives the steam turbine 10; the steam turbine 10 is connected to the generator 11, and the power of the steam turbine 10 is supplied to the generator 11 to generate electricity; the water supply device 12 is connected to the steam turbine 10 and the steam boiler 9.

According to the above-mentioned technical scheme, the drying, calcination and power generation of wet garbage form a set of relatively independent processes and systems. The power generation of generator 11 is adjusted and controlled by the amount of garbage feeding, bypass air valve 7 and bypass fan 8, which is the same as the original The waste heat power generation system 18 has no conflict.

The above disclosures are only preferred embodiments of the present invention, and equivalent changes made according to the present invention still fall within the protection scope of the present invention.

Claims (3)

1. A dry-process rotary kiln cooperative treatment of wet garbage bypass power generation technology, characterized in that: the C5 lower feed pipe of the cone of the C5 cyclone preheater at the bottom of the dry-process rotary kiln preheater system is used as the preheater for garbage The heat dryer uses the high-temperature strong alkaline powder mainly containing CaO flowing in the C5 feeding pipe as the preheating drying medium, and feeds the pretreated wet garbage into the C5 feeding pipe through the garbage feeding lock air device. Utilize the high-temperature powder mainly containing CaO in the C5 feeding pipe to quickly dry and alkalize the garbage. The 850-950℃ high-temperature powder that encloses the garbage vaporizes the moisture in the garbage into high-temperature steam, and the dry and flammable garbage enters with the powder. The smoke chamber at the end of the kiln is rapidly gasified and burned in the atmosphere of the high-temperature field at the bottom of 1000-1200 ° C. The large-increment high-temperature steam and combustion exhaust gas generated by the combustion are sucked into the bypass settling flue, and are treated by the bypass settling flue and bypassed. The road fan is mixed into the grate cooler head exhaust waste heat to adjust the air volume and air temperature, and the steam boiler generates steam power to drive the steam turbine, and the steam turbine drives the generator to generate electricity; the unburned garbage and burnt ash enter with the raw meal powder The rotary kiln is completely burned, and the garbage ash mixed in the raw meal powder is calcined into clinker; a small amount of hydrocarbons that have not been burned in time rise to the decomposition furnace and continue to be burned, and the HF, HCl, and SO ₂ produced by the decomposition of the garbage are passed through. The kiln tail smoke chamber and the calciner are absorbed and solidified by excess high-activity CaO; the high-temperature fly ash collected by the steam boiler is directly used as cement admixture powder, and the leached filtrate produced in the waste pretreatment is used as coal mill or vertical mill in cement production consumption, or as an alternative raw material for denitrification. 2. A dry-process rotary kiln synergistic treatment of wet garbage bypass power generation system implementing the process described in claim 1, comprising a C5 feeding pipe, a kiln tail smoke chamber, a rotary kiln, a decomposition furnace, a C5 cyclone preheater, and a grate Cooling machine and head exhaust fan, the C5 feeding pipe is connected to the kiln tail smoke chamber, the kiln tail smoke chamber is connected to the rotary kiln, and the upper part of the kiln tail smoke chamber is connected to the calciner through a shrinkage. It is characterized in that: It is also equipped with garbage feeding air locking device, bypass settling flue, bypass air valve, bypass fan, steam boiler, steam turbine, generator and water supply and treatment device, and the garbage feeding air locking device is connected with C5 feeding Pipe connected, located under the flap lock valve of the C5 feeding pipe, the bypass settling flue is located opposite the C5 feeding pipe, and connected with the kiln tail smoke chamber, the bypass damper is connected to the bypass settling smoke On the road, the air outlet end of the bypass fan is connected with the bypass settling flue, the air inlet end of the bypass fan is connected with the head row pipe of the grate cooler through the bypass fan damper, and the bypass settling flue It is connected with the steam boiler, the steam boiler is connected with the steam turbine, the steam turbine is connected with the generator, and the water supply and treatment device is connected with the steam turbine and the steam boiler. 3. The dry-process rotary kiln co-processing bypass power generation system for wet waste according to claim 2, characterized in that: the bypass settling flue is composed of a flue and an expansion chamber or a cyclone dust collection structure.