Natural gas cold flame horizontal type fire tube steam boiler

Abstract

The invention discloses a natural gas cold flame horizontal type fire tube steam boiler which comprises a fuel gas valve group (1), an anti-explosion fan (2), a burning head, a hearth (4), a first return stroke thread smoke tube (5), a rear smokebox (6), a second return stroke thread smoke tube (7), a turning smoke chamber (8), an energy saver (9), a condenser (10), a smoke outlet (11), a hearth access door (12), a shell cylinder (13) and a recycling pipeline (14); the burning head is a cold flame burning head; the outlet of the anti-explosion fan is connected with the cold flame burning head;mixed gas is sprayed into the hearth via the cold flame burning head for combustion; the hearth, the first return stroke thread smoke tube and the second return stroke thread smoke tube are arrangedin the shell cylinder; the first return stroke thread smoke tube is directly connected with the back of the hearth; the first return stroke thread smoke tube and the second return stroke thread smoketube are connected in series through the rear smokebox; a single row of water tube bundles is vertically arranged at the front end of the hearth; a mixed gas spray hole (a steel plate is a spray holecarrier) is formed between every two adjacent tube bundles; the energy saver is arranged at the lower part of the shell cylinder and is connected with the second return stroke thread smoke tube through the turning smoke chamber; the condenser is connected with the back of the energy saver; and a smoke outlet is formed in the back of the condenser.

Description

Technical field: [0001] The invention belongs to the technical field of gas-fired steam boilers, and in particular relates to a natural gas cold-flame combustion horizontal fire-tube steam boiler. Background technique: [0002] WNS type horizontal internal combustion fuel oil, gas fire tube steam boiler is a very classic type of fuel gas furnace. The boiler furnace adopts a horizontal internal combustion full wet back structure, and is equipped with high-efficiency threaded smoke pipes. All evaporation and heating are built in the pot shell, with high-temperature flue gas inside and water outside. It is also equipped with a perfect heat preservation outsourcing design, with less heat loss , high efficiency, large water capacity, good safety, long service life, convenient maintenance, is currently the most commonly used fuel gas boiler furnace type below 30t / h. [0003] In recent years, the country has paid more and more attention to energy conservation and environmental pro...

AI Technical Summary

Problems solved by technology

① The problem of gasification of the economizer, which is mainly due to the various situations of steam consumption by users, the automatic water supply of the boiler cannot be completely stable and continuous, and the water inside the economizer will stagnate for a short time, so that the economizer will have vaporization, steam plugging, vibration, Abnormal noise, oxygen corrosion, etc., especially reduce the service life of the steel pipe economizer

In addition, WNS-type boilers generally have a single-layer arrangement with smoke from the top. Generally, the economizer can only be arranged above the boiler body with the boiler body. The water pump flows to the open water tank, which not only wastes energy, but also the economizer communicates with the open tank, which is prone to oxygen corrosion

②Problems caused by low NOx diffusion combustion + flue gas recirculation low NOx technology, mainly because this technology requires a larger furnace structure, greater flue pressure head requirements, and higher power consumption

③Problems brought about by the fully premixed surface combustion technology, which requires higher air quality and a larger excess air coefficient, which reduces the energy efficiency of the boiler

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