CN205606581U - Circulating fluidized bed msw incineration boiler of flow state reconsitution - Google Patents

Abstract

The utility model belongs to the technical field of garbage incineration boilers, in particular to a circulating fluidized bed garbage incineration boiler with fluid state reconstruction. The utility model mainly solves the technical problem of high operating cost in the existing garbage grate type incineration boiler. The utility model includes a garbage incinerator composed of a furnace, an air distribution device, a separator, a self-balancing return valve, a central cylinder, a tail flue, a high-temperature superheater, a low-temperature superheater, an economizer and an air preheater, wherein : It also includes a panel heating surface and an evaporating tube bundle, the panel heating surface is arranged on the upper part of the furnace inner cavity, and the evaporating tube bundle is arranged on the upper part of the tail flue and connected with the water cooling system. The utility model has the advantages of good rubbish fuel combustion effect, fuel saving and low operation cost.

Description

A circulating fluidized bed waste incineration boiler with fluid state reconstruction

technical field

The utility model belongs to the technical field of garbage incineration boilers, in particular to a circulating fluidized bed garbage incineration boiler with fluid state reconstruction.

Background technique

At present, the annual discharge of urban domestic waste in the country has exceeded 150 million tons, that is, about 410,000 tons of domestic waste is generated every day, and it is increasing at a rate of about 6% per year. Making full use of its advantages has become the most promising way of comprehensive utilization of urban waste.

At present, the harmless incineration of garbage in large and medium-sized cities in China is still in its infancy. The main equipment relies on imported grate boilers, which requires a huge investment. Due to the complex composition of garbage and low calorific value, the grate boilers need a large amount of oil to support combustion. , the operating cost is expensive, and there is incompatibility. Domestic grate-type incinerators have higher requirements on the calorific value of waste, and the waste must be sorted during incineration to make the organic matter content reach more than 85%. However, domestic circulating fluidized bed boilers relying on the addition of some coal for combustion support also have the disadvantages of high fan energy consumption and large combustion support coal consumption due to the low calorific value of waste.

Contents of the invention

The purpose of the utility model is to solve the technical problem of high operating cost in the existing garbage grate type incineration boiler, and provide a circulating fluidized bed garbage incineration boiler with fluid state reconstruction.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A circulating fluidized bed garbage incineration boiler with fluid state reconstruction, including a furnace, an air distribution device, a separator, a self-balancing return valve, a central cylinder, a tail flue, a high-temperature superheater, a low-temperature superheater, and an economizer A waste incinerator composed of an air preheater, the air distribution device is connected to the furnace through a wind cap, the flue gas outlet of the furnace is connected to the flue gas inlet of the separator, and the return standpipe of the separator is connected to the furnace through a self-balancing return valve. The return port of the furnace is connected, the flue gas outlet of the separator is connected to the upper end of the tail flue through the central cylinder, the lower end of the tail flue is connected to the smoke inlet of the air preheater, the high temperature superheater, the low temperature superheater The economizer and the economizer are respectively arranged in the upper, middle and lower parts of the inner cavity of the tail flue, wherein: it also includes a panel-type heating surface and an evaporation tube bundle, the panel-type heating surface is arranged on the upper part of the furnace inner cavity, and the evaporation tube bundle is arranged in the The upper part of the tail flue is connected with the water cooling system.

The evaporating tube bundle can also be replaced by hanging tubes, and the hanging tubes are arranged on the upper part of the tail flue and connected with the low-temperature superheater.

The tail flue is a full-suspension structure of the steam-cooled package wall or a full-suspension structure of the rear brick wall.

The utility model adopts the above technical scheme, and carries out detailed analysis according to the actual situation of the fuel in the furnace, and adopts a panel-type heating surface (water-cooled screen or overheating screen) to effectively control the temperature of the furnace in the best interval, so that the desulfurization efficiency in the furnace can be improved. and SNCR (selective non-catalytic reduction) denitrification efficiency to achieve the best, to ensure that the pollutant discharge indicators at the outlet of the boiler air preheater meet or be lower than the national standard; Brick wall full-suspension structure, using evaporator tube bundles or hanging tubes according to the actual situation of the fuel, further optimizes the reasonable arrangement of the heating surface at the rear, ensures that the flue gas flow rate at the tail is within a reasonable range, and the medium flow rate is at the best state, thereby ensuring the boiler as a whole Increased efficiency. Through the optimization of the overall structure of the boiler, the garbage fuel combustion effect is better, so that the amount of combustion-supporting coal is reduced to 5-10% of the total fuel into the furnace. Therefore, compared with the background technology, the utility model has the advantages of good rubbish fuel combustion effect, fuel saving and low operating cost.

Description of drawings

Accompanying drawing is the structural representation of the utility model.

detailed description

As shown in the drawings, a circulating fluidized bed garbage incineration boiler with fluid state reconstruction in this embodiment includes a furnace 3, an air distribution device 4, a separator 2, a self-balancing return valve 11, and a central cylinder 6 , a tail flue 8, a high-temperature superheater 7, a low-temperature superheater 9, an economizer 10 and an air preheater 12. The air distribution device 4 is connected to the lower end of the furnace 3 through a wind cap. The flue gas outlet is connected to the flue gas inlet of the separator 2, the return riser of the separator 2 is connected to the return port of the furnace 3 through the self-balancing return valve 11, and the flue gas outlet of the separator 2 passes through the central tube 6 and the tail The upper end of the flue 8 is connected to the smoke outlet, the lower end of the tail flue 8 is connected to the smoke inlet of the air preheater 12, and the high temperature superheater 7, the low temperature superheater 9 and the economizer 10 are respectively installed in the tail flue 8 The upper, middle and lower parts of the inner cavity, wherein: it also includes a panel heating surface 1 and an evaporating tube bundle 5, the panel heating surface 1 is arranged on the upper part of the inner cavity of the furnace 3, and the evaporating tube bundle 5 is arranged at the end of the tail flue 8 The upper part is connected with the water cooling system.

The evaporating tube bundle 5 can also be replaced by hanging tubes, and the hanging tubes are arranged on the upper part of the tail flue 8 and connected with the low-temperature superheater 9 .

The tail flue 8 is a full-suspension structure of a steam-cooled package wall or a full-suspension structure of a brick wall at the rear.

Claims (3)

1. a refuse incinerator of circulating fluid bed for fluidised form reconstruct, including by burner hearth (3), air-distribution device (4), separator (2), self-balancing material returning valve (11), central tube (6), back-end ductwork (8), high temperature mistake The rubbish that hot device (7), low temperature superheater (9), economizer (10) and air preheater (12) form burns Burning stove, described air-distribution device (4) is connected with burner hearth (3) by blast cap, the exhanst gas outlet of burner hearth (3) and The gas approach of separator (2) connects, and the vertical feed back pipe of separator (2) passes through self-balancing material returning valve (11) Being connected with the returning charge mouth of burner hearth (3), the exhanst gas outlet of separator (2) is by central tube (6) and afterbody cigarette The upper end mouth in road (8) connects, and the lower end mouth of back-end ductwork (8) enters with air preheater (12) Mouth connects, and high temperature superheater (7), low temperature superheater (9) and economizer (10) are respectively provided at afterbody cigarette The upper, middle and lower of road (8) inner chamber, it is characterised in that: it also include curtain wall (1) and Steam-generating bank (5), described curtain wall (1) is located at the top of burner hearth (3) inner chamber, steam-generating bank (5) It is located at the top of back-end ductwork (8) and is connected with water-cooling system.

The refuse incinerator of circulating fluid bed of a kind of fluidised form the most according to claim 1 reconstruct, it is special Levy and be: described steam-generating bank (5) can also replace with hanging pipe, and hanging pipe is located at back-end ductwork (8) Top and be connected with low temperature superheater (9).

The refuse incinerator of circulating fluid bed of a kind of fluidised form the most according to claim 1 and 2 reconstruct, It is characterized in that: described back-end ductwork (8) is the vapour cold bag full overhung construction of wall or the full overhung construction of afterbody brick wall.