Coal-fired hot blast furnace with pre-combustion hearth and smoke circulating device

Abstract

The invention discloses a coal air heater with a preignition hearth and a smoke recycler, which can solve the problems of present product with short service life, lower heating efficiency and worse environment pollution. Wherein, the wind inlet of cycle fan (24) via the cycle smoke channel (23) is through to the side opening (37) of smoke outlet channel (22)); the wind outlet of cycle fan (24) via the outlet (35) of cycle smoke channel (23) is through to the smoke channel (30); the preignition hearth (2) is fixed on the lower pat of coal hopper (3) between the left and right side walls (13). The inventive preignition hearth is thermal-insulated, with higher burning strength, and high application to variable coals. At the back of furnace row, the burnt coke can make the fire bed in open fire condition, to burn the gas fully; said air heater can avoid black smoke to reduce environment pollution; the cycle smoke channel can reduce the temperature of heat exchanger, to improve the service life and efficiency of air heater.

Description

technical field [0001] The invention relates to a coal-fired hot blast stove. Background technique [0002] The hot air stove is a device that uses the heat generated by fuel combustion to heat the air and produce hot air. It can continuously provide constant temperature, clean hot air without pollution. Most of the existing hot blast stoves use loose coal as fuel, and conventional fixed grates, chain grates or reciprocating grates are used. The initial fuel combustion of hot blast stoves is insufficient, and the concentration of smoke and dust is high, which seriously pollutes the environment. When the coal quality is poor, there will also be problems such as flame pulling, high carbon content in ash, and insufficient output of hot blast stoves. Existing hot blast stoves mostly realize heat exchange between flue gas and air through heat exchangers. Air flows on one side of the heating surface of the hot blast stove. The heat release coefficient of the air to the heating s...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of the existing coal-fired hot-blast stoves such as short service life, low thermal efficiency, serious pollution and poor coal quality adaptability, and propose a coal-fired hot-blast stove with a pre-combustion furnace and a flue gas circulation device. The technical solution for solving the above problems is as follows: the present invention comprises a chain grate 1, a coal bucket 3, a coal gate 4, a front arch 6, a middle arch 8, a rear arch 11, a left side wall 13, a heat exchanger 14, and a top arch 17 , right side wall 19, exhaust flue 22, steel frame 31 and rear wall 33, left side wall 13 and right side wall 19 are respectively fixed on the left and right sides of chain grate 1, and front arch 6 is fixed on left side wall 13 and the front portion between the right side wall 19, the middle arch 8 is fixed on the middle part between the left side wall 13 and the right side wall 19, and the two ends of the rear wall 33 are connected with the rear ends of the left side wall 13 and the right side wall 19 respectively. Fixedly connected, the top arch 17 is fixed on the top between the left side wall 13 and the right side wall 19, the front end of the top arch 17 is flush with the front end of the front arch 6, and the rear end of the top arch 17 is arranged between the rear wall 33. The flue 30, the upper part of the middle arch 8 is provided with a gas nozzle 9, the space surrounded by the middle arch 8, the rear wall 33, the left side wall 13 and the right side wall 19 forms an open flame combustion chamber 34, and the rear arch 11 is arranged in the open flame combustion chamber 34, the left and right ends of the rear arch 11 are fixedly connected to the left wall 13 and the right wall 19 respectively, the rear end of the rear arch 11 is fixedly connected to the rear wall 33, and fireworks are formed between the front end of the rear arch 11 and the middle arch 8. Channel 36, the steel frame 31 is fixed on the upper end between the left wall 13 and the right wall 19, the heat exchanger 14 is fixed on the upper side of the steel frame 31, the front end of the exhaust duct 22 and the smoke outlet of the heat exchanger 14 Fixed connection, the smoke inlet of the heat exchanger 14 communicates with the flue 30, the coal hopper 3 is fixed at the front end between the left side wall 13 and the right side wall 19, and the coal gate 4 is arranged on the coal hopper 3 and the front arch 6 Between them, the space surrounded by the front arch 6, the middle arch 8, the left wall 13 and the right wall 19 forms a gasification combustion chamber 32, and the present invention also includes a pre-combustion furnace 2, a circulating flue 23 and a circulating fan 24; The air inlet of circulation blower 24 is communicated with the side port 37 of exhaust duct 22 by circulation flue 23, and the air outlet of circulation blower 24 is communicated with flue 30 by outlet 35 of circulation flue 23, and pre-combustion furnace 2 is fixed on Between the left side wall 13 and the right side wall 19 at the bottom of the coal hopper 3, the two ends of the flue gas passage 38 in the pre-combustion furnace 2 communicate with the flue gas passage 18 in the left side wall 13 and the right side wall 19 respectively, The passage outlets 5 of the flue gas passages 18 in the left side wall 13 and the right side wall 19 are respectively arranged in the gasification combustion chamber 32

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