Environment-friendly negative-pressure boiler

Abstract

The invention discloses an environment-friendly negative-pressure boiler. The environment-friendly negative-pressure boiler comprises a boiler body provided with a combustion cavity. The combustion cavity is provided with an extraction opening provided with an air extractor. A combustion table is arranged in the combustion cavity. The environment-friendly negative-pressure boiler further comprises an air return pipeline. An inlet of the air return pipeline is formed in the inner side of the air extractor. An outlet of the air return pipeline is formed in the lateral side of the combustion table. An air blowing device is arranged in the air return pipeline. The environment-friendly negative-pressure boiler serves as the negative-pressure boiler, the negative pressure is utilized in the air inflow manner, and therefore the air exhausted by the extraction opening is waste air. The air return pipeline can pump the waste air back to the position near the combustion table, the waste air participates in combustion and internally contains oxynitride, the oxynitride serves as an oxidizing agent in the combustion cavity again to be subjected to the oxygen removal reaction with fuel, nitrogen is finally generated, and emission of harmful gas is reduced. Meanwhile, the waste air has a function of oxygen lowering, the fuel combustion intensity can be lowered, the center temperature of fuel can be reduced accordingly, and accordingly restraining of the oxynitride generation is facilitated. The environment-friendly negative-pressure boiler is used as the boiler.

Description

technical field [0001] The invention relates to an environment-friendly negative pressure boiler. Background technique [0002] Boilers need to burn fuel. When burning fuel, under the action of high temperature, nitrogen and oxygen in the air are prone to chemical reactions to form nitrogen oxides that cause pollution, and a large amount of carbon monoxide will be produced due to insufficient combustion of fuel. Existing boilers are difficult to solve this problem, because the cheapest oxidant is air, but the nitrogen content in the air is very high. In order to reduce nitrogen oxides and make the tail gas meet the emission standards, many boiler manufacturers have to reduce the fuel supply speed of the boiler and arrange multiple combustion points to let the fuel exhaust the oxygen in the air as much as possible to reduce the production of nitrogen oxides. But this will cause the efficiency of the boiler to be greatly reduced. [0003] The boiler needs to be constantly re...

AI Technical Summary

Problems solved by technology

Because of the need for energy saving, the current boilers often recover steam and condense it into water with a higher temperature and store it in the water tank. The pressure in the water tank used for the boiler will change with the temperature of the water. If the pressure is too high, the sealing performance of the water tank will decrease, water leakage, and the tank will explode. The existing water tanks have vent holes that are normally open to ensure a constant pressure in the water tank.

However, the vent holes that are always open will cause heat loss, which is not energy-saving and environmentally friendly.

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