Three return stroke half fire coal, fuel oil and gas-fired smokeless boiler

Abstract

This invention relates to a three return travel half coal, oil and gas fuel smokelessness boiler. It includes boiler external cylinder, inner bag shell, multiple horizontal siphonal areas, water cold wall pipe, and combination furnace arch and fire grate. Its feature is that annular secondary air bellows and arched first air bellows are fixed under fire grate, the secondary air bellow is interconnected to vertical quadric air manifold set along furnace outer wall, semilunar horizontal air pipe is set under arched high temperature fume outlet at both sides of furnace. The combination furnace arch is consisted by yi form up furnace arch, inverse L form middle arch and concave down arch. The three arches are all formed by combination of horizontal cleet water cover and vertical cleet water cover and plugging cleet water cover connecting through fire bricks, and malpositioned in inner bag shell, three return travel flue is formed under up furnace arch. Both sides of up parts of inner bag shell shrink entad to form two segment special form barrel of vertical upright faces. Up part horizontal pipe is put up between two vertical upright faces. Bituminous coal smokelessness burning technique and inner furnace smoke prevention and dust control technique is formed by the boiler in this invention and air distribution burning technique and multifunction furnace arch structure. Coal cleanliness burning smokelessness boiler is formed by the combination of bituminous coal smokelessness burning technique and three return half coal process. Its heat efficiency is high when running longtime, energy saving effect is great, discharging of polluting matter is low, and the oil and gas fuel boiler is achieved.

Description

technical field [0001] The invention relates to the technical field of civil boilers, in particular to a three-pass semi-pass coal-fired, fuel-fired and gas-fired smokeless boiler. Background technique [0002] At present, the flue gas flow of vertical boilers and ordinary coal-fired smokeless boilers is a direct exhaust type, with low flue gas flow rate, short flow, and high exhaust gas temperature. It is also difficult to remove. When the flue gas side is covered with ash and scale, that is, the heat transfer effect is poor due to scale and scale on the heating surface. The service life is only about 2 years. [0003] The Chinese patent "Coal Clean Combustion Vertical Boiler" (Patent No.: 03237649.9) provides an upper, middle and lower composite furnace arch composed of orderly arranged horizontal water pipes and flue partitions that block the horizontal water pipes. And the strong combustion technology composed of the primary air distribution system and the secondary ai...

AI Technical Summary

Problems solved by technology

[0004] 1) The combined furnace arch in this technology, that is, the upper, middle and lower furnace arches are all composed of horizontal water pipes and flue partitions. This structural setting has continued for many years. The main heating surface of horizontal water pipe vertical boilers is prone to scale formation. , and the disadvantages that are difficult to eliminate, resulting in poor heat transfer efficiency, low thermal efficiency during boiler operation, and also affect the safe operation of the boiler;

[0005] 2) The secondary air distribution pipe of this technology is located on the inner wall of the furnace, which is easily burned by high-temperature flue gas and affects its long-term safe use;

[0006] 3) High manufacturing cost

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