Combustion device facilitating directly injecting water-coal slurry into low-oxygen flames to reduce NOx

Abstract

The invention relates to a combustion device facilitating directly injecting water-coal slurry into low-oxygen flames to reduce NOx. A water-coal slurry supplying mechanism provided with a water-coalslurry convey-out mother pipe, and a combustion mechanism provided with a high position separating air spray port, a low position separating air spray port, a water-coal slurry spray gun, a powder supplying air powder spray port and a gas supplying hot air spray port are included. Due to the reasonable structure innovation design, it is achieved that a method that only the water-coal slurry made from the conventional use coal of a boiler is utilized for generating a pyrolytic reaction in a furnace to generate active pyrolysis gas is utilized for reducing the NOx generated in the furnace and inhibiting generation of thermal NOx, the concentration of NOx in flue gas is effectively lowered, limitation of a traditional NOx reducing technology is broken through, and it is also guaranteed that the low nitrogen emission requirement of the boiler is met under the low-cost situation. The method is scientific and reasonable, the structure is simple and easy to implement, work is reliable, the daily using cost is low, operating management and low-cost efficient production of enterprises is facilitated, and very high practicability is achieved.

Description

technical field [0001] The invention relates to the technical field of boiler combustion devices, in particular to a combustion device for directly injecting coal-water slurry into a low-oxygen flame to reduce NOx. Background technique [0002] In the currently widely used and relatively mature low NOx combustion technology of coal-fired boilers in power stations, tail gas denitrification measures must be used to meet the low nitrogen emission requirements of the GB13223-2011 national standard, mainly by injecting The reduction of NOx by ammonia reducing agent is realized, among which selective catalytic reduction (SCR) technology and selective non-catalytic reduction (SNCR) technology are the main ones. Due to the relatively simple structure of the Selective Non-Catalytic Reduction (SNCR) technology, low investment cost, and easy retrofit and installation on existing boilers, it is widely used. The disadvantages are that the reaction temperature window is relatively narrow ...

AI Technical Summary

Problems solved by technology

Due to the relatively simple structure of the Selective Non-Catalytic Reduction (SNCR) technology, low investment cost, and easy retrofit and installation on existing boilers, it is widely used. The disadvantages are that the reaction temperature window is relatively narrow and ammonia escape It is more serious, resulting in limited reduction efficiency and low utilization rate of ammonia reductant; while selective catalytic reduction (SCR) technology has relatively high denitrification efficiency, but due to its relatively complicated structure, it is difficult to retrofit and install it on existing boilers. It is more difficult, the investment cost is higher, and there are application limitations due to the short life of the catalyst and serious secondary pollution.

Therefore, from the perspective of practicality and economy, there are limitations in the application of these two technologies at present, so it is necessary to develop a simple structure, scientific and reasonable, significant denitrification effect, low investment and daily operation costs, and easy to use. A new type of combustion device installed on the existing coal-fired boiler to meet the current industry demand for low-nitrogen compliance and alleviate a major problem currently plaguing the industry

Images