CN105972604A - Household garbage cooperative preliminary disposal system coupled to cement kiln and disposal method - Google Patents

Abstract

The invention discloses a household garbage cooperative preliminary disposal system coupled to a cement kiln and a disposal method. The system comprises a first crusher and a first screening machine which are mutually connected. Screen underflow dust garbage of the first screening machine is connected with a gasification thermal separation device through a conveying belt; the gasification thermal separation device separates organic matter from inorganic matter in the dust garbage; and the gasification thermal separation device is connected with a gasification pipeline connected with a decomposing furnace of the cement kiln. By means of the household garbage cooperative preliminary disposal system coupled to the cement kiln and the disposal method, the two technical problems in the garbage pretreatment process based on cement kiln disposal and the high-dust-content screen underflow and percolate disposal problem are solved; separation of the dust garbage is fully achieved by firstly performing crushing and then performing screening, and the influence on the bio-drying process is avoided; and the dust garbage is subjected to thermal separation in a gasification mode, therefore, the organic matter in the dust garbage is converted into gas fuel to be delivered into the decomposing furnace, the inorganic matter serving as gasification furnace slag is together delivered into a cement raw material mixing compartment for material mixing, and the system and method are totally different from existing engineering technologies that the dust screen underflow is directly subjected to cement material mixing.

Description

A domestic waste pretreatment system and method coupled with cement kiln co-processing

technical field

The invention relates to domestic waste disposal, in particular to a domestic waste pre-disposal system and method coupled with cement kiln co-processing.

Background technique

China produces a large amount of domestic waste, about 190 million t/a, accounting for 29% of the world's total. At present, the harmless treatment methods of municipal solid waste in my country include landfill, composting, and incineration, among which landfill is the main method (accounting for more than 80%), but the proportion of incineration is rising rapidly. Judging from the short-term trend, due to the requirement of "reduction", waste incineration technology is quite popular. According to Beijing’s opinions on comprehensively promoting domestic waste treatment, the ratio of domestic waste incineration, biochemical treatment and landfill in Beijing in 2012 was 2:3:5, realizing zero landfill of primary waste in urban areas. In 2015, the ratio was 4 :3:3, basically meet the needs of waste treatment of different components, and achieve zero landfill of domestic waste in the city. It can be seen that the comprehensive waste treatment method based on incineration treatment will become the main beacon of waste treatment in the future.

However, since domestic waste in most areas of our country is collected in a mixed manner, its composition is complex and often changes with regions and seasons, which makes the calorific value of waste very unstable, and incineration brings great harm to power generation or heating systems. Many problems often fail to achieve the expected design purpose. In order to maintain the normal operation of the system, most waste incineration plants often use the method of adding a large amount of auxiliary fuel for supplementary combustion, which greatly increases the operating cost and seriously affects its economic benefits; in addition, waste incineration will produce two parts of solid by-products, one part It is the incineration residue, which accounts for about 20-30% of the amount of waste incinerated, and is finally disposed of in landfill. The risk pollutants such as English are generally solidified by cement and then disposed of in deep landfill. It can be seen that the incineration treatment needs to cooperate with the final disposal site of landfill disposal to realize the waste treatment. In this way, the construction of the incineration plant must fully consider the landfill. Supporting issues; Finally, the issue of dioxin emissions from waste incineration plants has always been a hot spot of public concern, with great pressure from public opinion, and great resistance to the construction of incineration plants.

With the increasingly prominent problem of waste incineration and the continuous deepening of the concept of sustainable development, the treatment of municipal solid waste is no longer limited to the traditional old concept of how to control and destroy it. Instead, adopt a positive attitude and powerful measures to maximize recycling and comprehensive utilization in order to create a "garbage industry" with good economic benefits. The European Union requires no new combustible waste incinerators and municipal solid waste landfills in the treatment of municipal solid waste. In the future, all newly generated combustible waste and garbage should adopt other safer and more economical methods, and all of them should be processed as soon as possible. Disposal, one step in place, full consumption, no future troubles, use less or no landfills and incinerators; at the same time, the cement industry is also quite optimistic about the prospects for the consumption of combustible waste and municipal solid waste.

The safety of co-processing hazardous solid waste in cement kilns has been recognized worldwide, and the safety of co-processing municipal solid waste such as domestic waste is beyond doubt. However, due to factors such as high moisture content, irregular shape and size, and low calorific value in primary domestic waste, it is directly used for cement kiln disposal, which has the disadvantages of low disposal volume and great impact on cement kiln operation. Therefore, it is necessary to pretreat domestic waste to reduce moisture, increase calorific value, and increase processing capacity.

Contents of the invention

The purpose of the present invention is to propose a domestic waste pretreatment system and method coupled with cement kiln co-processing, aiming at the technical characteristics of cement kiln disposal of domestic waste, combined with the key problems to be solved in the pretreatment process, a new The domestic waste pretreatment system and method coupled with the cement kiln realize the seamless connection between the treatment of domestic waste and the cement kiln, and achieve near-zero discharge of solid, liquid and gas during the direct pretreatment of domestic waste.

In order to achieve the above object, technical scheme of the present invention is:

A domestic waste cooperative pretreatment system coupled to a cement kiln, wherein the system includes a first crusher and a first screening machine connected to each other, and the dust under the screen of the first screening machine is connected to a gasification heat separation machine through a conveyor belt. The gasification heat separation device separates the organic matter and inorganic matter in the dusty garbage. The gasification heat separation device is connected to a gasification pipeline connected to the cement kiln decomposition furnace. The gasification pipeline is used to transport the gas after the gasification of the organic matter. The gasification heat separation device is also connected with a conveyor belt, and the inorganic gasification slag separated by the gasification heat separation device is sent to the cement raw material batching system through the conveyor belt; the oversize of the first screening machine is connected to a buffer tank through the belt, and the buffer tank A hydraulic multi-lobe grab machine with a crane is installed on the top, and the oversize garbage in the buffer tank is evenly arranged in the biological drying treatment tank by the grab bucket for drying treatment. After the biological drying of the garbage is completed, the The dried product is transported to a feeder with a silo through a grab bucket, and the feeder is connected to the second screening machine; the second screening machine is connected to two sorting devices, and the first sorting device is equipped with a magnetic separator. To process the undersize of the second screening machine, the outlet of the first sorting device is connected to the gasification heat separation device, and the undersize of the second screening machine is gasified and decomposed; the second sorting device is equipped with a magnetic separator And Roots blower, used to process the sieved material of the second screening machine, the second sorting device is connected with two conveyor belts, and one conveyor belt sends the light material selected by wind as a high calorific value alternative fuel to the second crusher for further crushing The particle size is less than 50mm, and then sent to the chain plate machine containing the silo through the belt connection and directly sent to the decomposition furnace of the cement kiln; the other conveyor belt transports the heavy materials selected by the wind to the third crusher for crushing and then sends them into the cement kiln. Cement raw material batching system.

The solution is further as follows: the light material is the material blown by the Roots blower, and the heavy material is the leftover material blown by the Roots blower.

The scheme is further as follows: the buffer tank includes a plurality of drying treatment tanks, the drying treatment tanks are 2.5m to 3.5m above the ground, and extend 0.5m to 0.8m underground, and the bottom of the drying treatment tanks is provided with a leachate trap. The collection tank is provided with ventilation pipes in the middle of the ground of the drying treatment tank; the underground and above-ground parts of the drying treatment tank are separated by laying aeration plates, and a number of ventilation holes are arranged on the aeration plates, and the drying treatment tanks are located A centrifugal fan connected to the ventilation duct is arranged outside the drying area.

The scheme is further as follows: the leachate collection tank is provided with a leachate extraction pump, and the extraction pipe of the extraction pump is directly connected to the kiln head, kiln tail or gasifier of the cement kiln; the leachate collection tank is provided with an overflow The overflow port is connected to one or more fermentation tanks, and the fermented products are stacked in the fermentation tanks; the fermentation tank is connected to the feeder, and the feeder is connected to the gasifier.

The scheme is further as follows: the fermented material is leaves, stalks, straw or mixtures thereof.

A treatment method based on a domestic waste cooperative pre-treatment system coupled to a cement kiln, the system includes a first crusher and a first screening machine connected to each other, and the dust under the screen of the first screening machine is connected to a gasification machine through a conveyor belt. Thermal separation device, gasification thermal separation device to separate organic matter and inorganic matter in dusty garbage, a gasification pipeline connected to the cement kiln decomposition furnace connected to the gasification thermal separation device, the gasification pipeline is used to transport the gas after the gasification of organic matter The gasification heat separation device is also connected to a conveyor belt, and the inorganic gasification slag separated by the gasification heat separation device is sent to the cement raw material batching system through the belt; the oversize of the first screening machine is conveyed to a buffer tank through the belt and used as The raw material for drying treatment, the buffer tank includes a plurality of drying treatment tanks, the drying treatment tank is 2.5m to 3.5m above the ground, and extends 0.5m to 0.8m underground, and is set in the middle of the underground part of the drying treatment tank The ventilation pipe, the underground part and the aboveground part of the drying treatment tank are separated by an aeration plate, and a plurality of aeration holes are arranged on the aeration plate, and the oxygen required for biological drying is transported to the aeration plate through the ventilation pipe and the aeration holes For the waste materials on the drying tank, there is an exhaust fan outside the drying area where the drying treatment tank is located. Hydraulic multi-lobe grab machine, the grab machine is connected to a feeder with a bin, the feeder is connected to the second screening machine, the second screening machine is connected to two sorting devices, and the first sorting device is equipped with magnetic separation The machine is used to process the undersize of the second screening machine, the outlet of the first sorting device is connected to the gasification heat separation device, and the undersize of the second screening machine is gasified and decomposed; the second sorting device is equipped with a magnetic Separator and Roots blower are used to process the screened material of the second screening machine. The second sorting device is connected to two conveyor belts, and one conveyor belt sends the light materials selected by the wind as high calorific value alternative fuels to the second crusher. It is further crushed to a particle size of less than 50mm, and then sent to the chain plate machine containing the material bin through a belt connection and directly sent to the decomposition furnace of the cement kiln; another conveyor belt transports the heavy materials selected by the wind to the third crusher for crushing Send into cement raw material batching system, described method comprises:

Separate the organic matter and inorganic matter in the lime-soil garbage under the sieve of the first screening machine at a temperature of 850°C-1100°C in the gasification heat separation device;

For the undersize of the second screening machine, separate the organic matter and inorganic matter in the undersize of the second screening machine at a temperature of 850°C-1100°C in the gasification heat separation device;

Dry the oversize of the first screening machine in the buffer tank: use the grab bucket to move the oversize of the first screening machine delivered in the drying treatment tank, and expose it to the drying treatment tank. A layer of organic filler with gaps is laid on the air board, and a collection tank for leachate is provided at the bottom of the drying treatment tank. The aeration plates on the ground and underground parts of the drying treatment tank supply oxygen to the waste material to strengthen drying, and send the dried oversize to the next process.

The scheme is further as follows: the organic filler is one or two kinds of unbroken corn stalks, rice straws, and grain stalks, and the thickness of the laying is 2cm to 3cm.

The scheme is further: the method further includes processing the leachate in the collection tank: firstly, it is pumped by the leachate pump and then directly pumped to the kiln head, kiln tail or gasifier of the cement kiln for disposal, and the leachate in the collection tank The overflowing leachate is connected to one or more fermentation tanks, and the fermented material is stacked in the fermentation tanks.

The scheme is further as follows: the fermented material is leaves, stalks, straw or mixtures thereof.

The scheme is further as follows: the weight mixing ratio of the fermentation product and the leachate is 1:6.1 to 1:6.5, and after the multiple fermentation tanks are piled up for 1-3 days, they are transported to the storage bin of the gasifier as a gasifier raw materials.

The invention solves two technical problems in the process of waste pretreatment based on cement kiln disposal, the problem of disposal of undersize with high dust content and leachate, fully realizes the separation of dust waste by first crushing and then screening, and avoids The impact on the biological drying process, the dust waste is separated by heat in the form of gasification, the organic matter in it is converted into gas fuel and sent to the decomposition furnace, and the inorganic matter is transported to the cement raw material batching workshop as gasification slag for batching, which is different from the existing The engineering technology that the lime-soil undersieve is directly used for cement batching is completely different.

The invention realizes the comprehensive treatment and utilization of solid, liquid and gas of domestic garbage on the cement kiln through fewer process steps and simple operation.

The invention realizes zero discharge of leachate, and realizes multiple treatment of odor through the SQU deodorizer with gasification combustion, good start-stop performance, low operating cost and unattended operation.

The invention has few process steps, less key equipment, simple technical operation, small occupied area, and low investment and operation costs.

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a schematic block diagram of the system structure of the present invention.

detailed description

Example 1:

A domestic waste cooperative pre-disposal system coupled to a cement kiln, as shown in Figure 1, the system includes a first crusher 1 and a first screening machine 2 (drum screen) connected to each other, the under-screen of the first screening machine Lime-soil garbage is connected to a gasification heat separation device 3 through a conveyor belt. The gasification heat separation device separates organic matter and inorganic matter in the lime-soil waste. The gasification pipeline is used to transport the gas after the gasification of organic matter, and the gasification thermal separation device is also connected to a conveyor belt 6, and the inorganic gasification slag separated by the gasification thermal separation device is sent to the cement raw material batching system 7 through the conveyor belt; The oversize of the extension machine is connected to a buffer tank 8 for drying treatment through a belt. The buffer tank includes a plurality of drying treatment tanks 801. The drying treatment tanks are 2.5m to 3.5m above the ground and 0.5m to 0.8m underground. The bottom of the underground part of the treatment tank is provided with a collection tank 9 for leachate, and the middle part of the underground part of the drying treatment tank is provided with a ventilation pipe; There are multiple ventilation holes, and a centrifugal fan connected to the ventilation duct is installed outside the drying area where the drying treatment tank is located. The oxygen required for biological drying is transported to the garbage materials on the aeration plate through the air distribution pipe and ventilation holes. There is also an exhaust fan outside the drying area where the drying treatment tank is located. The exhaust fan collects the waste gas generated in the drying workshop and transports it directly to the gasifier, calciner or kiln head; Multi-lobe grab machine 10, the oversize garbage in the buffer tank is evenly arranged in the biological drying treatment tank by the grab bucket for drying treatment. The product is transported to a feeder 11 containing a silo, the feeder is connected to the second screening machine 12, the second screening machine is connected to two sorting devices, the first sorting device 13 is provided with a magnetic separator for processing the second The undersize of the second screening machine, the outlet of the first sorting device is connected to the gasification heat separation device, and the undersize of the second screening machine is gasified and decomposed; the second sorting device 14 is provided with a magnetic separator and a collector. The fan is used to process the screened material of the second screening machine. The second sorting device is connected to two conveyor belts. One conveyor belt 15 sends the light materials selected by wind as high calorific value substitute fuel to the second crusher 16 for further crushing. The particle size is less than 50mm, and then sent to the chain plate machine 17 of the silo through a belt connection and directly sent to the decomposition furnace of the cement kiln; another conveyor belt 18 transports the heavy materials selected by the wind to the third crusher 19 for crushing Finally, it is sent to the cement raw material batching system.

Wherein: the light material is the material blown by the Roots blower, and the heavy material is the leftover material blown by the Roots blower.

In the embodiment: the collection tank of the leachate is provided with a leachate extraction pump 20, and the extraction pipeline of the extraction pump is directly connected to the kiln head, kiln tail or gasifier of the cement kiln; the collection tank of the leachate is provided with an overflow The flow port and the overflow port are connected to one or more fermenters 21, in which fermented products are stacked; the fermenter is connected to a feeder 22, and the feeder is connected to the gasifier.

Wherein: the fermented material is leaves, stalks, straw or their mixtures.

In the embodiment: the weight mixing ratio of the fermented product and the leachate is 1:6.1 to 1:6.5, and the plurality of fermentation tanks are respectively connected to the overflow port through a stop valve, and when the mixing ratio is reached, the cut-off The valve is closed and signaled.

In an embodiment: the feeder is a double screw feeder.

Example 2:

A treatment method based on the domestic waste cooperative pre-treatment system coupled to the cement kiln described in Embodiment 1, the content in Embodiment 1 should also be used as the content of this embodiment; therefore, the system includes interconnected first crushing machine and the first sieving machine, the dusty soil garbage under the sieve of the first screening machine is connected to a gasification heat separation device through a conveyor belt, and the gasification heat separation device separates organic matter and inorganic matter in the dusty soil waste, and a gasification heat separation device is connected with a gasification heat separation device The gasification pipeline connected to the cement kiln decomposition furnace, the gasification pipeline is used to transport the gas after the gasification of organic matter, and the gasification heat separation device is also connected to a conveyor belt, and the inorganic gasification slag separated by the gasification heat separation device is sent into the Cement raw material batching system; the oversize of the first screening machine is transported by a belt to a buffer tank as a raw material for drying treatment. The buffer tank includes a plurality of drying treatment tanks, and the drying treatment tank is 2.5m above the ground to 3.5m, extending 0.5m to 0.8m into the ground. Ventilation pipes are set in the middle of the underground part of the drying treatment tank. The underground part and the above-ground part of the drying treatment tank are separated by aeration plates. Stomata, the oxygen required for biological drying is transported to the waste materials on the aeration plate through the ventilation pipes and ventilation holes, and an exhaust fan is installed outside the drying area where the drying treatment tank is located, and the exhaust fan concentrates the waste gas generated in the drying area After being collected, it is directly transported to the gasifier, decomposition furnace or kiln head; the buffer tank is equipped with a hydraulic multi-lobe grab machine, and the grab machine is connected to a feeder with a silo, and the feeder is connected to the second screening machine. The second screening machine is connected with two sorting devices. The first sorting device is provided with a magnetic separator for processing the undersize of the second screening machine. The outlet of the first sorting device is connected to the gasification heat separation device. The undersize of the screening machine is gasified and decomposed; the second sorting device is equipped with a magnetic separator and Roots blower to process the oversize of the second screening machine. The second sorting device is connected to two conveyor belts, one The conveyor belt sends the light material selected by wind as a high calorific value alternative fuel to the second crusher for further crushing to a particle size below 50mm, and then transports it to the chain plate machine with the silo through the belt connection and directly sends it to the decomposition furnace of the cement kiln Another conveyor belt transports the heavy material selected by wind to the third crusher and sends it into the cement raw material batching system after being crushed. The method includes:

Separate the organic matter and inorganic matter in the lime-soil garbage under the sieve of the first screening machine at a temperature of 850°C-1100°C in the gasification heat separation device;

For the undersize of the second screening machine, separate the organic matter and inorganic matter in the undersize of the second screening machine at a temperature of 850°C-1100°C in the gasification heat separation device;

Dry the oversize of the first screening machine in the buffer tank: use the grab bucket to move the oversize of the first screening machine delivered in the drying treatment tank, and expose it to the drying treatment tank. A layer of organic filler with gaps is laid on the air plate, and the bottom of the underground part of the drying treatment tank is also equipped with a leachate collection tank. And the aeration plates on the ground and underground parts of the interval drying treatment tank supply oxygen to the waste materials to strengthen drying, and send the dried oversize to the next process.

Among them: the setting of multiple drying treatment tanks is set according to the needs of the process. This structure can be used to dry the oversize of the first screening machine in time-sharing to improve the processing efficiency; the length and width of the drying treatment tank are mainly based on The amount of waste for biological drying, the layout of the biological drying site, etc. are set. The total number of drying treatment tanks and the number used per day are based on the total amount of waste, the fermentation cycle, the target moisture content of the fermentation product, and the biological drying product. factors such as end use.

The space of 0.5 to 0.8m at the bottom of the drying treatment tank has two main functions. One is to arrange the air distribution pipes of the entire drying treatment tank. Each drying treatment tank corresponds to a fan, and the other is to collect the biologically dried leachate.

At present, an important problem in the process of biological drying is the problem of clogging of the aeration holes. Because the garbage contains some very small particles of dusty soil garbage, or the organic matter with large particle size is continuously decomposed during the biological drying process of garbage, some small particles will also be formed. In addition, the moisture content of the garbage is relatively high. These small particles of garbage materials are easy to block the aeration holes under the action of free water in the garbage, thereby affecting aeration and further affecting the effect of biological drying of garbage.

The present invention proposes a method to prevent the clogging of the aeration holes. Before distributing garbage, a layer of organic filler is laid on the aeration plate of the drying treatment tank. The organic filler mainly refers to one of corn stalks, rice straw, and grain stalks. one or two kinds, among which corn stalks are preferred. The laying thickness of the organic filler is 2-3cm, and the organic filler does not need to be broken deliberately. The function of laying organic filler is mainly reflected in the grid function of the organic filler to isolate the garbage material from the aeration hole, and the fine particles of garbage are intercepted by the organic filler and do not directly enter the aeration hole; the organic filler is a material that is easy to absorb water and can quickly Absorb the free water in the garbage and prevent the mud and glue formed by the free water in the garbage and dust or small-sized garbage from clogging the aeration holes; an important feature of the organic filler is that it does not need to be cleaned and cleaned regularly like the inorganic filler. The filler can be used as an alternative fuel for cement kiln together with the dried product after biological drying, or it can be used as an alternative fuel for cement kiln together with the dried product according to the decomposition of the organic filler. Grab buckets for layout.

Wherein: the organic filler is one or two kinds of unbroken corn stalks, rice straws, and grain stalks, and the thickness of the laying is 2cm to 3cm.

The method further includes treating the leachate in the collection tank: first pumping it directly to the kiln head, kiln tail or gasifier of the cement kiln after being extracted by the leachate pump, and disposing of the leachate overflowing in the collection tank One or more fermentation tanks are connected, and the fermented products are stacked in the fermentation tanks; the fermentation tanks are connected to the feeder, and the feeder is connected to the gasifier. If the water content of the waste is high in summer and autumn, resulting in a large amount of leachate during the pretreatment process, or the cement kiln cannot be completely disposed of during the maintenance of the cement kiln, the remaining leachate can be fully mixed with corn straw and rice straw with good water absorption As an alternative fuel for cement kilns, it is directly sent to the gasifier for disposal. The specific operation method is: crush the corn stalks or straws to 10-50mm, first lay the crushed corn stalks or straws into the fermentation collection tank (the crushed straws or straws and leachate are mixed in a ratio of 1:6.1-6.5), According to the designed ratio, the leachate is slowly sprayed on the straw, and after simple stacking for 1-3 days, it is directly transported to the storage bin of the gasifier by the biological drying double-screw feeding equipment as the raw material of the gasifier.

In the method: the fermented material is leaves, stalks, rice straw or their mixtures. The weight mixing ratio of the fermented product and leachate is 1:6.1 to 1:6.5, and after the multiple fermentation tanks are piled up for 1-3 days, they are transported to the storage bin of the gasifier as raw material for the gasifier.

In the method: on the one hand, the crushing process is to achieve the purpose of breaking garbage bags, and on the other hand, it is to ensure that the particle size of the garbage material is below 200mm, which is convenient for subsequent drying treatment; the mechanical separation includes II-level screening, I-level screening The purpose is to sieve out the lime soil with high content of inorganic components, so as to avoid the existence of lime soil from blocking the ventilation holes of subsequent biological drying, which is completely inconsistent with the existing drying first and then crushing process, and also effectively solves the problem The problem of serious blockage of the ventilation holes by the process, the second-level screening is mainly to screen the materials after biological drying. The purpose of the screening is to separate the materials with high and low calorific values, and the purpose is to directly and indirectly mix with the existing domestic waste. Direct docking of kiln technology.

In the method: the garbage material is conveyed to the crusher through the automatic feeding grab, and after the garbage is crushed, it is transported to the I-level screening device through the belt, and the under-screen garbage material with high dust content is screened out after the screening process , the lime soil garbage is further separated by thermal separation to realize the separation of organic and inorganic matter in the garbage. The separated organic matter is used as an alternative fuel for the cement kiln in the form of gasification, and the inorganic matter is sent to the raw material warehouse of the cement plant for batching; the waste material on the sieve is used for biological drying Chemical treatment, biological drying adopts the trough drying process, the drying treatment tank is equipped with a centrifugal fan and ventilation pipes, the bottom of the drying treatment tank is equipped with a leachate collection tank, and the biological drying process uses a fully automatic grab bucket cloth . After the biological drying is completed, the dried materials are further subjected to stage II screening. The purpose of stage II screening is to realize the separation of high and low calorific value waste materials. Garbage with low calorific value enters the gasifier after magnetic separation for indirect kiln disposal; waste with high calorific value enters the winnowing device after magnetic separation, and the light materials of winnowing are crushed and then directly sent to the decomposition furnace to directly enter the kiln. The selected heavy materials are sent to the raw material warehouse of the cement plant for batching. The leachate produced during the entire pretreatment process is collected centrally and transported to the cement kiln head or gasifier in the plant for treatment. If the moisture content of the waste is high in summer and autumn, the leachate produced during the pretreatment process will be large, and the cement kiln will The kiln head cannot be completely disposed of, and the remaining leachate can be fully mixed with corn stalks and wood chips with good water absorption, and then directly sent to the gasifier for disposal. The organic components in the leachate are oxidized and decomposed by high temperature and the unique technological process of the cement kiln, and become the gas that can meet the emission standards; the inorganic components enter the cement clinker as the raw material of cement.

The system of Example 1 and the method of Example 2 above solve two technical problems in the process of waste pretreatment based on cement kiln disposal, the problem of disposal of undersize with high dust content and leachate. The separation of lime-soil garbage is realized, and the influence on the biological drying process is avoided. The lime-soil garbage is thermally separated in the form of gasification, and the organic matter in it is converted into gas fuel and sent to the decomposition furnace, and the inorganic matter is transported to the cement raw material together as gasification slag. The batching workshop is used for batching, which is completely different from the existing engineering technology in which the lime-soil underscreen is directly used for cement batching. It also complies with the clear provisions in Article 6.6.6 of the HJ662-2013 Environmental Protection Technical Specifications for the Co-processing of Solid Waste in Cement Kilns: The mill can only feed solid waste that does not contain organic matter and volatile semi-volatile heavy metals.

Landfill leachate has the characteristics of high BOD5 and COD concentrations, high metal content, and high ammonia nitrogen content. The current treatment methods include biological methods and physical and chemical methods. Biological methods are divided into aerobic biological treatment, anaerobic biological treatment and the combination of the two. Physical and chemical methods mainly include activated carbon adsorption, coagulation sedimentation, membrane treatment, chemical oxidation and gas stripping. and many other methods. However, according to the current domestic leachate treatment project research, the biological and physical chemical methods either have poor treatment effects or high actual operating costs. In this method, the landfill leachate generated during the biological drying process is sent to the head of a cement kiln for high-temperature treatment, and a small amount of leachate produced during the storage of alternative fuels is sent to a gasifier for high-temperature treatment. The organic components in the leachate are oxidized and decomposed by high temperature and the unique technological process of the cement kiln, and become the gas that can meet the emission standards; the inorganic components enter the cement clinker as the raw material of cement. In view of the high moisture content of waste in summer and autumn and the large amount of leachate produced in the pretreatment process, a treatment technology that is highly integrated with cement kiln disposal has also been proposed.

Claims (10)

1. the house refuse being coupled in cement kiln works in coordination with pretreatment system, it is characterized in that, described system includes interconnective first disintegrating machine and the first screening machine, under the sieve of the first screening machine, dirt rubbish connects a heat of gasification segregation apparatus by conveyer belt, Organic substance in heat of gasification segregation apparatus separation dirt rubbish and inorganic matter, the gasification pipe being connected with cement kiln dore furnace that heat of gasification segregation apparatus connects, gasification pipe gas after carrying Organic substance gasification, heat of gasification segregation apparatus is also connected with a conveyer belt, the inorganic matter gasifier slag that heat of gasification segregation apparatus separates sends into cement raw material feed proportioning system by conveyer belt；The oversize of the first screening machine is connected to a dashpot by belt, the hydraulic pressure orange-peel bucket machine of band driving it is provided with on dashpot, oversize rubbish in dashpot carries out drying and other treatment by grabbing bucket to be arranged in biological dewatered treatment trough rubbish material uniformly, after rubbish biological mummification terminates, by grab bucket, mummification product being transported to a batcher containing feed bin again, batcher connects the second screening machine；Second screening machine connects two sorting units, is provided with magnetic separator for processing the second screening machine siftage in the first sorting unit, and the first sorting unit outlet connects described heat of gasification segregation apparatus, and the second screening machine siftage carries out the resolution process that gasifies；Second sorting unit is provided with magnetic separator and roots blower, for processing the second screening machine oversize, second sorting unit connects two conveyer belts, article one, the light material that selecting crude drugs with winnower is gone out by conveyer belt is sent into the second disintegrating machine as high heating value alternative fuel and is crushed to below particle diameter 50mm further, then connects, by belt, the chain mat machine being transported to containing feed bin and is sent directly into the dore furnace of cement kiln；The heavy material that selecting crude drugs with winnower is gone out by another article of conveyer belt sends into cement raw material feed proportioning system after being transported to the 3rd crusher in crushing.

Collaborative pretreatment system the most according to claim 1, it is characterised in that described light material is the material blown out by roots blower, described heavy material is that roots blower blows surplus material.

Collaborative pretreatment system the most according to claim 1, it is characterized in that, described dashpot includes multiple drying and other treatment groove, drying and other treatment groove 2.5m to 3.5m above ground level, stretch into underground 0.5m to 0.8m, be provided with the collecting tank of percolate at drying and other treatment trough lower bottom part, under drying and other treatment trough, middle part is provided with ventilation shaft；Drying and other treatment groove underground and aboveground is spaced by laying aeration board, is provided with multiple air vent on aeration board, arranges the centrifugal blower being connected with ventilation airduct outside mummification district residing for drying and other treatment groove.

Collaborative pretreatment system the most according to claim 3, it is characterised in that the collecting tank of described percolate is provided with percolate draw-off pump, the pipeline of extracting out of draw-off pump is connected directly to the kiln hood of cement kiln, kiln tail or gasification furnace；The collecting tank of described percolate is provided with overfall, and overfall connects one or more fermentation tanks, is stacked with and is fermented thing in fermentation tank；Fermentation tank connects batcher, and batcher connects described gasification furnace.

Collaborative pretreatment system the most according to claim 4, it is characterised in that described in be fermented thing be leaves, straw, Caulis et Folium Oryzae or their mixture.

6. the method for disposal working in coordination with pretreatment system based on the house refuse being coupled in cement kiln, described system includes interconnective first disintegrating machine and the first screening machine, under the sieve of the first screening machine, dirt rubbish connects a heat of gasification segregation apparatus by conveyer belt, Organic substance in heat of gasification segregation apparatus separation dirt rubbish and inorganic matter, the gasification pipe being connected with cement kiln dore furnace that heat of gasification segregation apparatus connects, gasification pipe gas after carrying Organic substance gasification, heat of gasification segregation apparatus is also connected with a conveyer belt, the inorganic matter gasifier slag that heat of gasification segregation apparatus separates sends into cement raw material feed proportioning system by belt；The oversize of the first screening machine is by raw material as drying and other treatment after Belt Conveying to dashpot, described dashpot includes multiple drying and other treatment groove, drying and other treatment groove 2.5m to 3.5m above ground level, stretch into underground 0.5m to 0.8m, at the middle part of drying and other treatment trough lower part, ventilation shaft is set, drying and other treatment trough lower part and aerial parts are spaced by aeration board, multiple passage it is disposed with on aeration board, biological dewatered required oxygen flows to the rubbish material on aeration board by ventilation shaft and passage, residing for drying and other treatment groove, mummification district is outside equipped with air exhauster, it is delivered directly to gasification furnace after the waste gas centralized collection that mummification district is produced by air exhauster, dore furnace or kiln hood；Hydraulic pressure orange-peel bucket machine it is provided with on dashpot, grab claw connects a batcher containing feed bin, batcher connects the second screening machine, second screening machine connects two sorting units, first sorting unit is provided with magnetic separator for processing the second screening machine siftage, first sorting unit outlet connects described heat of gasification segregation apparatus, and the second screening machine siftage carries out the resolution process that gasifies；Second sorting unit is provided with magnetic separator and roots blower, for processing the second screening machine oversize, second sorting unit connects two conveyer belts, article one, the light material that selecting crude drugs with winnower is gone out by conveyer belt is sent into the second disintegrating machine as high heating value alternative fuel and is crushed to below particle diameter 50mm further, then connects, by belt, the chain mat machine being transported to containing feed bin and is sent directly into the dore furnace of cement kiln；The heavy material that selecting crude drugs with winnower is gone out by another article of conveyer belt sends into cement raw material feed proportioning system after being transported to the 3rd crusher in crushing, it is characterised in that described method includes:

First screening machine is sieved down dirt rubbish in heat of gasification segregation apparatus with the Organic substance in the temperature separation dirt rubbish of 850 DEG C-1100 DEG C and inorganic matter；

Second screening machine siftage is separated the Organic substance in the second screening machine siftage and inorganic matter with the temperature of 850 DEG C-1100 DEG C in heat of gasification segregation apparatus；

The oversize of the first screening machine in dashpot is made drying and other treatment: with grab bucket walking, the oversize transmitting the first screening machine come is carried out cloth in drying and other treatment groove, and on drying and other treatment groove aeration board, lay the organic filler in one layer of band gap, drying and other treatment trench bottom is additionally provided with the collecting tank of percolate, by the centrifugal blower arranged outside mummification district, on the ventilation shaft arranged in the middle part of under drying and other treatment trough and interval drying and other treatment trough, the aeration board with under ground portion carries oxygen boosting mummification to rubbish material, oversize after mummification is sent into next process.

Method of disposal the most according to claim 6, it is characterised in that described organic filler is corn straw, Caulis et Folium Oryzae, one in grain straw or 2 kinds not crushed, and the thickness of laying is 2cm to 3cm.

Method of disposal the most according to claim 6, it is characterized in that, described method farther includes to process the percolate in collecting tank: be disposed in being pumped directly into the kiln hood of cement kiln, kiln tail or gasification furnace by percolate pumping after first being taken, the percolate overflowed in collecting tank is connected one or more fermentation tanks, fermentation tank is stacked with and is fermented thing.

Method the most according to claim 8, it is characterised in that described in be fermented thing be leaves, straw, Caulis et Folium Oryzae or their mixture.

Method the most according to claim 8 or claim 9, it is characterised in that described fermented product is 1:6.1 to 1:6.5 with the Mixing ratio by weight example of percolate, is transported to the storage bin raw material as gasification furnace of gasification furnace after the plurality of fermentation tank is banked up 1-3 days.