CN203534218U

CN203534218U - Recovery and utilization system for heat of flue gas discharged from normalizing treatment

Info

Publication number: CN203534218U
Application number: CN201320471421.3U
Authority: CN
Inventors: 郑秀恩; 杨玉国
Original assignee: SHANDONG RUNYUAN INDUSTRY Co Ltd
Current assignee: SHANDONG RUNYUAN INDUSTRY Co Ltd
Priority date: 2013-08-02
Filing date: 2013-08-02
Publication date: 2014-04-09
Anticipated expiration: 2023-08-02

Abstract

Provided is a recovery and utilization system for heat of flue gas discharged from normalizing treatment. The system comprises a blower, a connecting pipe, a cold air duct, a heat exchange sleeve, a hot air duct, a combustion gas pipe, a burning nozzle, a normalizing furnace and a chimney. The heat exchange sleeve is provided with, in a direction of an axis, a separator plate that divides a cavity of the heat exchange sleeve into a flue gas channel and an air channel that are mutually independent. Heat pipes erected on the separator plate are distributed inside the flue gas channel and the air channel. Combustion air sent from the cold air duct to the air channel of the heat exchange sleeve is preheated by the blower and then is sent out from the hot air duct for mixed combustion with combustion gas, and generated flue gas is sent from a smoke conveying pipeline to the flue gas channel of the heat exchange sleeve and then discharged after heat recovery. Air is heated for combustion supporting, so the heat efficiency of a heating furnace is improved, the highest combustion temperature point is made to increase and fuel can be saved. High temperature air stays in a low-oxygen state compared with normal temperature air, combustion in a low-oxygen atmosphere enables the volume of flames to increase by times, temperature fields inside the furnace are evenly distributed, a combustion peak value temperature is reduced, and low NOx emission is achieved.

Description

To discharging the recycling system of flue gas heat in normalized treatment

Technical field

The utility model relates to heat treatment technics field, relates in particular to the recycling of the fume afterheat to producing in the normalized treatment operation of heat treatment process.

Background technology

Normalizing; claim again normalizing; workpiece to be heated to Ac3 in normalizing furnace (Ac3 refers to the phase transition temperature of carbon steel in actual heating process; be generally from 727 ℃ to 912 ℃) or more than Acm (Acm is the actual critical-temperature line of hankering hypereutectoid steel complete austenitizing that adds) 30～50 ℃; after insulation a period of time, from stove, take out in air or the metal heating processing technology of water spray, spraying or quenching.Combustion gas is burnt and is produced a large amount of hot flue gases in normalizing furnace, hot flue gas carries 500 ℃ of above heat of high temperature, does not generally take correlation means in existing process of manufacture, and the entrained heat of hot flue gas is recycled, and directly emit, cause very large waste.In addition, even if take relevant recovery measure, majority is only also to use in heating, insulation or bathing, and recovery utilization rate is very limited.

Utility model content

The utility model is for realizing the abundant recycling of the entrained heat of a large amount of flue gases that normalized treatment stove is discharged, the technological means of taking is, provide a kind of to discharging the recycling system of flue gas heat in normalized treatment, it utilizes the entrained heat of flue gas to heat burning required air, make like this combustion gas and hot-air be blended in normalizing furnace chamber inner combustion, i.e. so-called high-temperature air burning.

The technical scheme in the invention for solving the technical problem is: a kind of to discharging the recycling system of flue gas heat in normalized treatment, comprise air blast, tube connector, cold air duct, heat exchange cover, hot-flow flue, Gas Pipe, burner, normalizing furnace, chimney, support column; Heat exchange cover is cavity body structure, and it is axially installed on support column; Inner chamber at heat exchange cover is provided with dividing plate along axis direction, and dividing plate is divided into separate exhaust gases passes and air duct by the inner chamber of heat exchange cover, the added heat pipe that is equipped with of dividing plate, and heat pipe all has distribution in exhaust gases passes and air duct; The air outlet of air blast is communicated with the air inlet of tube connector, the air outlet of tube connector is communicated with the air inlet of cold air duct, the air outlet of cold air duct is communicated with the air inlet that heat exchange puts air duct, the air outlet of air duct is communicated with the air inlet of hot-flow flue, the air outlet of hot-flow flue communicates with the inner chamber of Gas Pipe, the port of export of Gas Pipe connects burner, and burner is located in the burner hearth of normalizing furnace; Top at normalizing furnace is fixed with tobacco transmission pipe; The mouth that enters of tobacco transmission pipe is communicated with burner hearth cavity, and its outlet flue is communicated with the mouth that enters that heat exchange puts exhaust gases passes, and the outlet flue of exhaust gases passes is communicated with the mouth that enters of chimney.

Air after being heated is burnt by burner place after the port of export of Gas Pipe mixes with combustion gas, the flue dust producing, the tobacco transmission pipe that waste gas etc. are arranged by normalizing furnace top is discharged through chimney, high-temperature flue gas is when the exhaust gases passes through heat exchange cover, high-temperature flue gas washes away the heat pipe in exhaust gases passes, when 30 ℃ of flue-gas temperature >, heat pipe will be activated and automatically heat be conducted to the heat pipe section that is positioned at air duct, high-temperature flue gas temperature after the heat pipe heat absorption in exhaust gases passes lowers and is discharged by chimney like this, the heat absorbing conducts to the heat pipe in air duct, normal temperature air washes away the heat pipe in air duct along cold air duct reverse flow under the effect of air blast, at this moment the heat pipe heat release in air duct, normal temperature air is heated, air after heating is delivered to Gas Pipe and combustion gas mixing and burns at burner place through hot-flow flue.

The beneficial effects of the utility model are: hot-air is more conducive to and full combustion of fuel than cold air, reduce the caloric receptivity of air to heating furnace simultaneously, can improve thermal efficiency of heating furnace; High temperature air and fuel mix burning, can make the maximum temperature point reach of burning, fuel saving; The relative normal temperature air of high temperature air, in hypoxia, has so just been realized hypoxic atmosphere burning, compares with traditional flame, flame volume increases exponentially, and temperature field in furnace is evenly distributed, and has reduced combustion peak temperature, avoid a large amount of generations of NOx, realized low NOx drainage.Be that the utility model heat recovery rate is high, fuel saving, makes the Temperature Distribution in normalizing furnace more even, and reduces NOx discharge capacity.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

In figure: 1 air blast, 2 tube connectors, 3 cold air ducts, 4 heat exchange covers, 41 exhaust gases passes, 42 air ducts, 43 dividing plates, 44 heat pipes, 5 hot-flow flues, 6 Gas Pipe, 7 burners, 8 normalizing furnaces, 81 tobacco transmission pipes, 9 chimneys, 10 support columns.

The specific embodiment

For ease of further understanding the technical solution of the utility model, below in conjunction with accompanying drawing, it is described further.

As shown in Figure 1, a kind of to discharging the recycling system of flue gas heat in normalized treatment, comprise air blast 1, tube connector 2, cold air duct 3, heat exchange cover 4, hot-flow flue 5, Gas Pipe 6, burner 7, normalizing furnace 8, chimney 9, support column 10; Described heat exchange cover 4 is axially installed on support column 10; Described heat exchange cover 4 is cavity body structure, and the dividing plate 43 in its inner chamber is axially disposed within is divided into non-interference exhaust gases passes 41 and air duct 42, the added heat pipe 44 that is equipped with of dividing plate 43, and this heat pipe 44 is prior art, for its action principle, repeats no more herein.Described heat pipe 44 is at described exhaust gases passes 41 and air duct 42 is interior all a distribution; The air outlet of described air blast 1 is communicated with the air inlet of described tube connector 2, the air outlet of described tube connector 2 is communicated with the air inlet of described cold air duct 3, the air outlet of described cold air duct 3 is communicated with the air inlet of air duct 42 on described heat exchange cover 4, the air outlet of air duct 42 is communicated with the air inlet of described hot-flow flue 5, the air outlet of described hot-flow flue 5 communicates with the inner chamber of described Gas Pipe 6, the port of export of described Gas Pipe 6 connects burner 7, and described burner 7 is located in the burner hearth of described normalizing furnace 8; On the top of normalizing furnace 8, be fixed with tobacco transmission pipe 81; The mouth that enters of described tobacco transmission pipe 81 is communicated with burner hearth cavity, and its outlet flue and described heat exchange are overlapped exhaust gases passes 41 on 4 and entered mouth and be communicated with, and the outlet flue of described exhaust gases passes 41 is communicated with the mouth that enters of described chimney 9.

Heat exchange is overlapped 4 operation principles as shown in Figure 1: the right is exhaust gases passes 41, and the left side is air duct 42, and centre is separated by dividing plate 43, and exhaust gases passes 41, air duct 42 do not interfere with each other.High-temperature flue gas is by exhaust gases passes 41 discharges on the right, during discharge, high-temperature flue gas washes away heat pipe 44 the right (when 30 ℃ of flue-gas temperature >, heat pipe 44 is activated and just automatically heat is conducted to the left side), at this moment heat pipe 44 the right heat absorptions, high-temperature flue gas is flowed through after the rear temperature of heat pipe 44 declines and is discharged, and heat is absorbed by heat pipe 44 and conducts to its left side.Normal temperature clean air, under air blast 1 effect, flows and washes away heat pipe 44 left sides in the other direction along left side air duct 42, at this moment heat pipe 44 left side heat releases, and by clean air heating, air stream temperature behind the left side of heat pipe 44 raises.

Heat exchange cover 4 is installed in burner hearth mouth, and the right-hand member of heat pipe 44 is by heat absorption in flue gas and conduct to left end at a high speed, exhaust gas temperature is down to approach zero point and reduces heat emission loss, and its flue gas waste heat recovery efficiency is up to 80%.Clean high temperature air after heating is used as combustion air.

HTAC utilizes heat storage type combustion basic principle, utilizes heat-accumulation type hot exchange, on the one hand high-temperature smoke discharging temperature is reduced to below 30 ℃, on the other hand the combustion air of normal temperature is preheating to hundreds of celsius temperature.HTAC and the difference of conventional combustion technology are: efficient pre-heating system and hypoxemia flameless combustion state.High temperature is that air themperature is preheating to hundreds of degree Celsius.Hypoxemia refers to volumetric expansion after air heat, and in unit volume, oxygen molecule content reduces, and makes oxygen concentration in combustion zone lower than 15%, even be low to moderate 3-5%.Combustion process: air themperature is by preheating, pour an oxygen content lower than in 15% combustion chamber, delay to separate out heat energy under shape burning with Poor oxygen gas fuel, there is not the localized hyperthermia's hyperoxia district occurring in traditional combustion process, the high-temperature flue gas generating after burning, through heat exchange cover 4, carry out discharging after heat exchange, form like this alternate cycles, realize the high temperature preheating of limit waste heat recovery and combustion air.

Adopt the advantage of high-temperature air combustion promoter to be: more than combustion adjuvant air themperature is preheating to fuel self-ignition point temperature, fuel is energy ignition in entering stove, ignition temperature is good, after combustion air preheated in high temperature, reduced the requirement to fuel value, be conducive to effective utilization of low calorie fuels, realized energy-efficiently, fractional energy savings is greater than 30%; Hypoxic atmosphere burning, compares with traditional flame, and flame volume increases exponentially, and temperature field in furnace is evenly distributed; Reduce combustion peak temperature simultaneously, avoided a large amount of generations of thermal NO x, realized super low NOx drainage.

Claims

1. to discharging a recycling system for flue gas heat in normalized treatment, it is characterized in that:

Comprise air blast (1), tube connector (2), cold air duct (3), heat exchange cover (4), hot-flow flue (5), Gas Pipe (6), burner (7), normalizing furnace (8), chimney (9) and support column (10);

Described heat exchange cover (4) is cavity body structure, and it is axially installed on described support column (10);

The inner chamber of described heat exchange cover (4) is provided with dividing plate (43) along axis direction, and described dividing plate (43) is divided into separate exhaust gases passes (41) and air duct (42) by the inner chamber of described heat exchange cover (4);

The added heat pipe (44) that is equipped with of described dividing plate (43), described heat pipe (44) all has distribution in described exhaust gases passes (41) and described air duct (42);

The air outlet of described air blast (1) is communicated with the air inlet of described tube connector (2), the air outlet of described tube connector (2) is communicated with the air inlet of described cold air duct (3), the air outlet of described cold air duct (3) is communicated with the air inlet of the upper air duct (42) of described heat exchange cover (4), the air outlet of air duct (42) is communicated with the air inlet of described hot-flow flue (5), the air outlet of described hot-flow flue (5) communicates with the inner chamber of described Gas Pipe (6), the port of export of described Gas Pipe (6) connects burner (7), described burner (7) is located in the burner hearth of described normalizing furnace (8),

On the top of described normalizing furnace (8), be fixed with tobacco transmission pipe (81);

The mouth that enters of described tobacco transmission pipe (81) is communicated with burner hearth cavity, and its outlet flue enters mouth with exhaust gases passes (41) on described heat exchange cover (4) and is communicated with, and the outlet flue of described exhaust gases passes (41) is communicated with the mouth that enters of described chimney (9).