CN205048449U - Processing system of grate type waste incinerator multifuel combustion mud - Google Patents

Abstract

The utility model discloses a treatment system for co-burning sludge of a grate type garbage incinerator. device. In the system, the heat of the flue gas from the waste incinerator is first transferred to the heat medium through the indirect heat exchanger of the incinerator, and then the heat medium is transferred to the sludge of the sewage plant through the sludge dryer. The sludge is semi-dried, and the sludge is mixed with straw after semi-drying, and the derived fuel is pressed by a granulator. The derived fuel is transported to the garbage pond and mixed with the garbage, and then sent to the incinerator for combustion. The sludge generated during the drying process of the sludge dryer After the odor is dehumidified by the dehumidification equipment, it is passed into the garbage pool as the combustion-supporting air of the incinerator, and the cold flue gas from the indirect heat exchanger is mixed into the flue gas of the incinerator and then discharged after being treated by the flue gas purification device. The utility model avoids the problem of cross-contamination caused by waste heat flue gas directly drying the sludge, and at the same time realizes the safe treatment of the odor in the sludge drying process.

Description

A grate type waste incinerator co-combustion sludge treatment system

technical field

The utility model relates to a treatment system for co-burning sludge of a grate type garbage incinerator.

Background technique

Domestic waste incineration power generation technology has dual benefits of environmental protection and energy. In recent years, the construction of modern large-scale domestic waste incineration plants in my country has developed rapidly. There are more than 200 domestic waste incinerators in the country, most of which are grate type incinerators. furnace. The outstanding characteristics of my country's urban domestic waste are: high moisture content, low calorific value, high content of kitchen waste, and low recyclable content. For incineration plants, high food waste and high moisture will affect the working conditions of waste incineration. It is usually necessary to add straw with a relatively high calorific value as auxiliary fuel to maintain the normal operation of the system. However, the straw has light density, high volatile content, and fast burning speed. It is difficult for the straw to be directly mixed into the incinerator to support combustion and to be incinerated synchronously with the garbage in the furnace.

In addition, in 2010, 156 million tons of domestic garbage were removed and transported in cities above the middle level, the total amount of wastewater discharge was 58.92 billion tons, of which domestic sewage was 35.48 billion tons, and the generation of residual sludge (with a moisture content of 80%) reached 16.8352 million tons. The high calorific value of sludge is the most valuable part of sludge being used as a resource. If the calorific value of sludge in sewage treatment plants is fully utilized, the sludge can be thoroughly treated and at the same time generate economic benefits. However, there are two basic conditions for the calorific value resources of sludge to be utilized: one is that the moisture content of sludge must be reduced as much as possible; the other is that the organic matter in sludge must be preserved. The main cost of sludge drying lies in heat energy, which accounts for more than 80% of the drying operation cost. Selecting and utilizing an appropriate heat source is the key to reducing costs. In order to reduce the energy consumption of sludge drying, it is necessary to find a low-cost drying heat source. Weng Huanxin of Zhejiang University proposed a process of using power plant flue gas to directly dry sludge. This process can effectively utilize the waste heat of flue gas, but the direct contact between flue gas and sludge is likely to cause cross-contamination of flue gas and sludge. A large amount of foul-smelling flue gas needs to be treated again.

Utility model content

The purpose of the utility model is to provide a grate-type waste incinerator co-combustion sludge treatment system with a simple structure in order to make up for the defects of the prior art.

The utility model is realized through the following technical solutions: a grate type waste incinerator co-combustion sludge treatment system, characterized in that: the system sequentially includes: waste incinerator, sludge drying unit, granulator, power generation unit Equipment and flue gas purification device, wherein the sludge drying unit is mainly composed of an indirect heat exchanger, a sludge dryer, and a dehumidification equipment. In the system, the hot flue gas from the The heater transfers heat to the heat medium, and the heat medium brings the heat into the sludge dryer. After the sludge is semi-dried in the sludge dryer, it is mixed with straw and then sent to the granulator to be pressed into derivatives. The fuel and derived fuel are transported to the garbage pond in front of the incinerator. The odor generated by the sludge dryer is dehumidified by the dehumidification equipment, and then sent to the garbage pond through the pipeline for combustion-supporting air treatment of the incinerator. The cold gas discharged from the indirect heat exchanger The flue gas is sent to the flue gas purification device through pipelines. The power generation equipment includes a steam turbine and a generator. The flue gas purification device includes a deacidification tower, a bag filter, an induced draft fan and a chimney.

The sludge dryer is a hollow paddle dryer.

Features and advantages of the utility model are:

(1) Blending sludge in waste incineration plants can not only make full use of the remaining processing capacity of existing waste incineration power plants, but also can treat waste, and effectively turn sludge into treasure, realizing its harmlessness deal with. It is beneficial to solve the problems of high cost caused by deep sludge drying, and the simple blending of sludge will affect the normal operation of the waste incineration power generation system.

(2) Using flue gas waste heat as the drying heat source of sludge can significantly reduce the moisture content of sludge without consuming new energy, which can not only reduce the thermal pollution of power plants, but also reduce the cost of sludge drying, and realize low energy consumption. Dried sludge is consumed; the waste heat flue gas is intercepted from the flue of the power plant, which will not affect the normal operation of the power plant, and the heat is indirectly exchanged to the heat medium through the heat exchanger, effectively avoiding the cross-contamination of flue gas and sludge.

(3) The blades of the hollow paddle dryer have the characteristics of self-cleaning ability, high heat utilization rate, less heat loss, and compact equipment structure. The odor generated during the sludge drying process enters the garbage pool of the garbage grate furnace incineration system, and then Through the air supply system, it is sent to the incinerator for combustion, which effectively avoids the secondary pollution of the environment caused by the odor.

(4) The main components of sludge are sugar, fat and protein, which have good cohesiveness. By mixing semi-dry sludge and straw to make derivative fuel, this characteristic can be used to integrate straw and sludge, which not only solves the problems of high energy consumption and wear and tear encountered in the production and forming process of traditional biomass pellet fuel. Serious and other problems, and it is beneficial to increase the burning duration of straw in the garbage incinerator.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1. Garbage pool, 2. Incinerator, 3. Indirect heat exchanger, 4. Hollow paddle dryer, 5. Granulator, 6. Dehumidification equipment, 7. Power generation equipment, 8. Deacidification tower, 9. Bag filter, 10. Induced fan, 11 chimney.

detailed description

In order to further understand the invention content, characteristics and effects of the present utility model, the following embodiments are listed hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Fig. 1, a grate-type waste incinerator co-combustion sludge treatment system, the system includes in turn: a part of the hot flue gas (about 200°C) coming out of the incinerator 2 is sent to the indirect heat exchanger 3, The heat is transferred to the heat medium through the indirect heat exchanger 3, and the heat medium brings the heat into the hollow paddle dryer 4, and the sludge with a moisture content of 80% is sent to the hollow paddle dryer 4 after entering the plant, and the hollow paddle drier The sewage plant sludge is semi-dried in the leaf dryer 4. After the sludge is dried to about 40%, it is mixed with the straw. The mixing ratio of the two is 1:2-1:3. After mixing, it is sent to the granulator 5 for pressing Derived fuel, the finished product of the derived fuel is sent to the garbage pool 1, mixed with domestic garbage and sent to the incinerator 2 for combustion, and the odor generated by the hollow paddle dryer 4 is dehumidified by the dehumidification device 6, and then passed into the garbage pool 1 As the combustion-supporting air treatment of the incinerator, the cold flue gas from the indirect heat exchanger 3 and the flue gas discharged from the incinerator 2 are treated by the flue gas purification device before being discharged. The power generation equipment 7 includes a steam turbine and a generator; the flue gas purification device of the incinerator 2 includes a deacidification tower 8 , a bag filter 9 , an induced draft fan 10 and a chimney 11 .

Although the preferred embodiment of the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative, not restrictive, and those skilled in the art Under the enlightenment of the utility model, those skilled in the art can also make many forms without departing from the purpose of the utility model and the protection scope of the claims, and these all belong to the protection scope of the utility model.

Claims (2)

1. the treatment system of a fire grate type incinerator multifuel combustion mud, it is characterized in that: this system comprises successively: incinerator, sludge drying unit, comminutor, generating equipment and smoke eliminator, wherein said sludge drying unit is primarily of indirect heat exchanger, sludge dryer, dehumidification equipment forms, in the system, described incinerator heat smoke out, heating agent is transferred heat to by indirect heat exchanger, heating agent brings heat into described sludge dryer, mud is after described sludge dryer is semi-oriented, send into described comminutor after mixing with stalk and be pressed into derivatived fuel, derivatived fuel is transported to the garbage pool before incinerator, the foul smell that sludge dryer produces is after described dehumidification equipment dehumidifying, the combustion air process that garbage pool makes incinerator is sent into by pipeline, the cold flue gas that indirect heat exchanger is discharged sends into described smoke eliminator through pipeline, generating equipment comprises steam turbine, generator, described smoke eliminator comprises extracting tower, sack cleaner, air-introduced machine and chimney.

2. the treatment system of a kind of fire grate type incinerator multifuel combustion mud according to claim 1, is characterized in that sludge dryer is hollow blade dryer.