Ash settling, denitrifying and cooling all-in-one machine for flue gas of straw combustion boiler and implementation method

Abstract

The invention relates to an ash settling, denitrifying and cooling all-in-one machine for flue gas of a straw combustion boiler and an implementation method. Hot flue gas generated during combustion of straw fuels enters an ash settling chamber, so that one part of flying ash freely settles relying on gravity, and the other part of ash particles hit against a smoke separating wall I opposite to a flue gas inlet to settle to a plurality of ash settling funnels II; the settling hot flue gas sequentially passes through an intake channel I, a first convection bank, an inlet and outlet channel I, a second convection bank, an inlet and outlet channel II, a third convection bank and an outlet channel II to enable the hot flue gas to stall once more, and to settle to a plurality of ash settling funnels I; the settling hot flue gas directly enters a low-temperature denitrifying device; and after the nitrogen in the flue gas is removed, the processed flue gas enters a heat energy exchanging device, and after being cooled, the entered flue gas enters following equipment. The ash settling, denitrifying and cooling all-in-one machine disclosed by the invention has the effect that the heat exchange of a straw boiler is greatly improved; the abrasion of a pipeline of the straw boiler is reduced, so that during the process of heat exchange of the pipeline, the flue gas freely moves; and the atmospheric emission and the energy resource consumption are reduced, and besides, the material cost, the manufacturing cost, the mounting cost and the occupied space cost can be reduced.

Description

Technical field [0001] The invention relates to an integrated machine for reducing ash, nitrogen and temperature of flue gas of a straw burning boiler and an implementation method. The straw burning boiler nitrogen removal and cooling integrated machine is a kind of heat energy exchange equipment that uses plant straw and weed biomass to press high-density pellets or rolled into pieces smaller than a certain size as fuel. It belongs to a biomass burning boiler. Background technique [0002] The existing straw burning boiler only has the boiler body, and there is no flue gas inside to turn to the ash chamber. It is not a fuel feeding structure on the top of the boiler. The low-temperature nitrogen removal device and heat exchange device are arranged outside the boiler body. The burner and the furnace body are flanged. And bolt connection. The above structure will produce many unfavorable factors for the boiler body. [0003] 1. When a straw burning boiler burns straw fuel, a certa...

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Problems solved by technology

The above structure produces many unfavorable factors for the boiler body

[0003] 1. When the straw combustion boiler burns straw fuel, a certain concentration of fly ash will be formed. The amount of fly ash is larger than that of other fuels, which makes it easier to form adhesion and accumulation on the convective heating surface, affecting the exchange rate of the heating surface. The flow rate of heat and flue gas, the heat transfer performance of the boiler is poor, and the fly ash has a large wear on the straw boiler pipe, which increases the maintenance cost of the boiler pipe

[0004] 2. In the past, the burner and the main body were connected by flanges and bolts. The burner was suspended at the lower part of the boiler body chassis as a whole, and the entire weight was attached to the boiler chassis, which caused great pressure on the boiler chassis structure.

[0005] 4. The delivery of fuel is generally to push fuel into the burner at the lower part of the burner, or to deliver fuel into the burner from the side, which will cause blockage and uneven distribution of fuel

[0006] 3. The low-temperature nitrogen removal device and heat exchange device (economizer) are arranged outside the boiler body and connected through the flue, which occupies a large area, wastes the materials for connecting the flue, and increases the installation and construction costs

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