Combined method for reducing furnace and calcine furnace and the furnace

Technical Field

The invention relates to a reduction furnace and calciner joint method and kiln used, belongs to the smelting and calcined Technical Field.

Background Art

The existing and calcining the reduction of material is separate from the two production process, the calcining rotary kiln or a vertical kiln to calcine, existing calcining rotary kiln or a vertical kiln, a related ancillary facilities, large floor area of the equipment, so that the production is on a large scale, production is not flexible, is applicable for large-scale production. Reduction with reducing furnace for reduction, the capacity of the screws, and also small, small production capacity, a great amount of materials to the calcining rotary kiln after induction of the need to wait for the reduction reaction is stored. Existing rotary kiln or a vertical kiln and to the relatively large output, if we have to small-scale production, the use of rotary kiln or a vertical kiln will cause the waste of energy, the problem of low heat utilization. At the same time, the reduction of the reducing furnace, radiant tube heating high-temperature flue gas to pass reduction reaction of reduction material, passes through the reduction furnace temperature of the discharged flue gas is very high, can only heat recovery of the flue gas, is not directly applied in production, causing waste heat.

Content of the invention

The aim of the invention is to, provide a reduction furnace and a calciner joint method and kiln used. Reduction furnace flue gas directly used for the discharge of the calcined, enhancing the utilization rate of the heat, calcining and reducing production become a continuous production, in small-scale and lives in advance perinatal alternative calcining rotary kiln or kiln, reduce the production cost.

The technical scheme of the present invention. Reduction furnace and calciner method of joint use, the flue gas produced can be provided with a reduction furnace, also includes 1 is provided with a flue gas inlet and a flue gas outlet of the calciner; the further reduction of the smoke outlet of the flue gas inlet of a calciner is connected in series, so that the reduction furnace can be of the discharged flue gas into the calcining furnace, the discharge of the direct reduction furnace flue gas to the calcining of the material in the calciner.

The reduction furnace and calciner method of joint use, the outlet of the calcining furnace flue gas enters the heat exchanger, the heated air through the heat exchanger, hot air into the reduction furnace combustion.

The reduction furnace and calciner method of joint use, is arranged on the calcining furnace for the auxiliary combustion chamber to the flue gas necessary for auxiliary heating.

The reduction furnace and calciner method of joint use, reducing furnace coal water slurry used as fuel, pulverized coal, gas, or oil fuel, or directly using the other production of the flue gas.

Reduction furnace and a calciner kiln for joint use, the flue gas produced can be provided with a reduction furnace 1, also includes 1 a is provided with a flue gas inlet 6 and a flue gas outlet of the calciner 4 ; the reduction furnace 1 the smoke outlet of the calciner 4 of the flue gas inlet 6 is connected in series.

The above-mentioned kiln, reduction furnace 1 is installed in the lower part of the inclined bottom plate 12, in the reducing furnace 1 is arranged above the charging port 13, is arranged below the slag discharge port 14, the reducing furnace 1 is arranged in heating the material of the radiant tube 2.

The aforesaid kiln, the calciner 4 is arranged in the lower part of the inclined bottom plate 15, in the calciner 4 is arranged above the feeding port 22, the discharge port is arranged below the 18, calciner 4 is provided with a into the flue gas heating gas of the material 5.

The aforesaid kiln, reduction furnace 1 is arranged the combustion chamber 3.

The aforesaid kiln, calciner 4 is arranged on the auxiliary combustion chamber 24.

The aforesaid kiln, calciner 4 is connected with the outlet of the exhaust gas heat exchanger 8, heat exchanger 8 the air outlet is connected to the reduction furnace 1.

In the invention, the calcination and reduction to produce the combined to become a continuous production, the production of the reducing furnace for reduction, emissions reduction furnace of the high-temperature flue gas to the calciner material calcining, calciner and of the discharged flue gas after heat exchange, the heated air is sent into the reduction furnace for combustion in the combustion chamber. The invention is characterized in that the reduction furnace of the high-temperature flue gas can be directly used for production, improve the utilization rate of the heat, the discharge of the calcining furnace flue gas through the high-temperature superconductive heat pipe exchanger, the hot flue gas recycling, heat utilization rate of the whole system is high. The calciner reduction furnace calcining of the emitted high temperature flue gas, so that the calcining the production is flexible, prevent a large amount of material storage wait for the reduction. The fuel is more flexible, can use the coal-water slurry, pulverized coal; can also use gas, fuel oil and other liquid fuel, or other production of the hot flue gas.

Description of drawings

Figure 1 is schematic diagram of the structure of the present invention.

1-reduction furnace, 2-radiant tube, 3-combustion chamber, 4-calciner, 5-conductive pipe, 6-flue gas inlet, -7 the flue gas inlet of the heat exchanger, 8-heat exchanger, 9-air inlet, 10-air inlet, 11-fuel inlet, 12-upper top plate, 13- charging hole , 14-slag discharge port, 15-the lower base plate, 16-auxiliary slag discharge port, 17-slag discharging valve, 18-discharge opening, 19-the lower base plate, 20- dregs rock drill , 21-auxiliary discharge port, 22- charging hole , 23-the upper top plate, 24-the auxiliary combustion chamber.

Mode of execution

The embodiment of the invention. Reduction furnace and a calciner kiln and method for joint use, the reduction furnace 1 and a calciner 4 combined to become a continuous production, as shown in Figure 1, can produce flue gas of the reduction furnace 1, is provided with a flue gas inlet 6 and a flue gas outlet of the calciner 4 ; also the reduction of the smoke outlet of the flue gas inlet of a calciner 6 are connected in series. The reduction furnace 1 through the pipeline of the discharged flue gas entering the calciner 4, utilize high-temperature flue gas to the calciner 4 of calcined material. In the calciner 4 the upper part of the installed in the top plate 23 and the lower part of the inclined bottom plate 19, the calcined material is discharged is convenient, in the calciner 4 is arranged above the feeding port 22, is arranged below the discharge port 18, discharge port 18 is also provided with opposite side of the auxiliary discharge port 21 and dregs rock drill 22, calciner 4 is arranged in the gas heating of the material 5, calciner 4 is provided with a flue gas inlet 6, the calciner 4 the upper part of the top plate 23 is provided with vent holes or air discharge duct, the air duct 5 the sealing at the top of the, flue gas would be able to enter fully into the calcining material, and then the top plate from the upper part 23 of the discharge vent or exhaust groove. Reduction furnace 1 the upper part of the installed in the top plate 12 and the lower part of the inclined bottom plate 15, the reduction material is discharged is convenient, in the reducing furnace 1 is arranged above the charging port 13, is arranged below the slag discharge port 14, on the lower bottom plate 15 is also provided on the other side of auxiliary slag discharging port 16, the auxiliary slag discharging port 16 dregs rock drill is installed in. Reduction furnace 1 is provided in the material heating of the radiant tube 2.

Reduction furnace 1 of the combustion chamber is arranged on the upper part or the lower part 3, in the combustion chamber 3 is provided with a fuel inlet 11 and an air inlet 10, reducing furnace 1 can be made of water-coal slurry fuel, pulverized coal, gas, or oil fuel, or directly using the other production of the flue gas directly into the reduction furnace 1 the inner.

Reduction furnace air inlet 10 is connected with a heat exchanger 8 of the hot air outlet. Heat exchanger 8 adopts the superconducting heat exchanger, heat pipe is provided with a high heat conducting performance of the heat transfer element, the full closed by the vacuum envelope of the working fluid in the evaporation and condensing to transfer heat, has extremely high heat conductivity, good isothermic, the two sides of the hot and cold heat transfer area can be changed arbitrarily, can be long-distance heat transfer, temperature can be controlled, and a series of advantages. The heat pipe of the heat pipe heat exchanger has high heat transfer efficiency, compact structure, fluid resistance loss is small, it is beneficial to control the dew point corrosion, and the like.

In order to improve the thermal efficiency, calciner 4 enter into the heat exchanger of the discharged flue gas 8 of the flue gas inlet of the heat exchanger 7, heat exchanger 8 through the pipeline heating the air entering the combustion chamber 3 the air inlet 10.

The working principle of the present invention: reducing furnace 1 of the combustion chamber 3 through the fuel inlet 11 and fuel is injected into air inlet 10 to enter the hot air for combustion to generate high temperature flue gas, through the reduction furnace 1 of the radiant tube 2, the heat is radiated, the material heating reduction, discharge flue gas through the calciner 4 of the flue gas inlet 6 into the calciner 4 in, the calciner 4 the lower base plate 19 to the annular interspace and reverted on 5 the flue gas in introduced into the calcining material, calcining the material, the upper part of the smoke gas to pass through the top plate 23 of the vent holes or air discharge duct into the heat exchanger 8 is heated from the air inlet 9 into the air, the heated hot air entering the combustion chamber 3 to burn.

In the invention, a calciner 4 the temperature of the calcined material in the reduction furnace to be lower than 1 the temperature of the material reduction in, through the reduction furnace 1 after reducing the work of a certain temperature of the flue gas still maintain a relatively high temperature, the high-temperature flue gas entering the calciner 4 can continue to carry out the calcining. For example, and to add to the reduction of the calcined dolomite of production, reduction of the temperature is 1200 degrees Celsius, the temperature of the exhaust gas to out of 1100 degrees Celsius, the flue gas can be directly into the calcining furnace to the dolomite is calcined. So that the reduction furnace 1 of directly used in the production of high temperature flue gas, to improve the utilization rate of the heat, the flue gas after calcining then passes through a heat exchanger 8 by heat, heat utilization rate of the whole system more high. Can also be in the calciner 4 is arranged on the auxiliary combustion chamber 24, necessary for the auxiliary heating of the flue gas, the temperature of the flue gases is improved, higher requirements to calcining temperature of the material.