Water-cooled flue gas internal circulation ultra-low nitrogen boiler body device

Abstract

The invention relates to a water-cooled flue gas internal circulation ultra-low nitrogen boiler body device. A combustor is fixedly arranged on a front wall of a boiler, the outlet end of the combustor is connected with a corrugated liner, a return smoke distribution chamber is arranged at the lower end of the left side of the boiler body, a chimney discharge area is arranged at the upper end of the right side of the boiler body, the right side of the corrugated liner is provided with any one structure of a conical surface or a circular groove, the circular groove forms a forced smoke return chamber, a partition plate is arranged according to requirements and is used for changing the flue gas direction and the smoke return path, four combination structures and four flue gas flow directionin the boiler are formed through mutual matching between the partition plate and the conical surface or circular groove of the corrugated liner, and a preferred structure of the four combination structures is provided with a water-cooled smoke return pipeline, the forced smoke return chamber, the return smoke distribution chamber, a return smoke distribution device, and the partition plate. The flue gas flow direction formed through the preferred structure is the optimal flue gas flow direction; and a set of water-cooled flue gas internal circulation system is formed through combination.

Description

technical field [0001] The invention belongs to the technical field of boiler equipment, and in particular relates to a water-cooled flue gas internal circulation ultra-low nitrogen boiler body device. Background technique [0002] The boiler is a kind of energy conversion equipment. The energy input to the boiler includes chemical energy and electric energy in the fuel, and the boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of heat energy. The original meaning of the pot refers to the water container heated on the fire, and the furnace refers to the place where fuel is burned. The boiler includes two parts: the pot and the furnace. The hot water or steam generated in the boiler can directly provide the required heat energy for industrial production and people's life, and can also be converted into mechanical energy through a steam power device, or converted into electrical energy through a generator. Boilers that provide hot wate...

AI Technical Summary

Problems solved by technology

[0007] Disadvantages: increasing the size of the furnace requires correspondingly increasing the size of the boiler body, increasing the manufacturing cost of the boiler; the amount of flue gas in the internal circulation is not large, and the temperature of the furnace cannot be significantly reduced; so the effect of reducing nitrogen oxides is not great

[0011] 1. The gas pressure requirements are high, and users in low-pressure areas need to increase investment in pressure regulating equipment

[0012] 2. It is necessary to increase the volume of the fan

[0013] 3. The power of the motor needs to be increased, and some projects need to increase the flue gas external circulation (FGR) induced draft motor, which will increase power consumption and increase user costs

[0014] 4. It is required to increase the size of the boiler furnace, which increases the cost of boiler manufacturing

[0015] 5. To achieve NOX ≤ 30mg / m3 requires the assistance of flue gas external circulation (FGR) technology. Flue gas external circulation (FGR) technology will produce acidic condensed water into the furnace, reduce the thermal efficiency of the boiler, and corrode the burner and furnace, reducing the boiler service life

[0017] 7. In extremely cold areas, the condensed water produced by the external flue gas circulation (FGR) will quickly condense into ice cubes, which will block the fan inlet and cause the shutdown of the furnace

[0023] 1. The temperature in the furnace changes at any time, the flue gas circulation volume is unstable, the backflow ratio is difficult to control, and the flue gas flow direction is even more difficult to control

[0024] 2. The rewinding high-temperature flue gas will wash the front wall of the furnace and the corrugated liner for a long time, causing damage to the inside of the boiler body and reducing the service life of the boiler

[0027] Summary: This burner flue gas internal circulation (FIR) technical solution can effectively reduce nitrogen oxides, but the life of the combustion head and the life of the boiler body will be shortened

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