Rotary kiln waste heat recovery device

Abstract

The utility model relates to the technical field of waste heat recovery devices, and discloses a rotary kiln waste heat recovery device which comprises a box body, a filter box, a liquid feeding port, a liquid discharging port, an air inlet pipe, an air outlet pipe, a carbon cavity, activated carbon, a first fan and a second fan. By the adoption of the structure, waste heat of the surface of the rotary kiln can be recycled through an existing box body, meanwhile, waste heat of high-temperature flue gas exhausted by the rotary kiln is recycled, and therefore filtered gas with temperature flows to the drying kiln again and is matched with corresponding parts of the drying kiln for drying; the energy for heating the air by the drying kiln is saved, and the waste heat of the high-temperature flue gas is recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery devices, in particular to a rotary kiln waste heat recovery device. Background Art

[0002] The rotary kiln is an important industrial equipment, widely used in cement, metallurgy, chemical industry and other industries. However, the rotary kiln will generate a lot of waste heat during the production process. If it is not utilized, it will cause energy waste and environmental pollution. For example, the surface temperature of the rotary kiln is relatively high. In the prior art, heat exchangers or heat pipes are usually installed on the surface of the rotary kiln to transfer the waste heat on the surface of the kiln to other media to achieve energy transfer and utilization.

[0003] However, this method cannot utilize the waste heat of flue gas and the recovery efficiency is low. Utility Model Content

[0004] The utility model mainly provides a rotary kiln waste heat recovery device to solve the problem that the existing method of recovering waste heat by installing corresponding equipment on the surface of the rotary kiln cannot utilize the flue gas waste heat and the recovery efficiency is low.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A waste heat recovery device for a rotary kiln comprises a housing sleeved on the outer side of the rotary kiln, a filter box is arranged on the outer side of the housing, a liquid filling port and a liquid discharge port are provided on the filter box, an air inlet pipe and an air outlet pipe are provided on the filter box, the air inlet pipe is connected to the smoke exhaust pipe of the rotary kiln, and the air outlet pipe is connected to the convection air inlet pipe of the drying kiln; a carbon cavity is arranged on the air inlet pipe, activated carbon is arranged in the carbon cavity, a first fan is arranged on the air inlet pipe between the carbon cavity and the filter box, and a second fan is arranged on the air outlet pipe. The housing in the present application is any one of the prior art, which is sleeved on the outer side of the rotary kiln, and heat exchange is performed by filling the housing with a corresponding medium, such as water. A liquid inlet and a liquid outlet are provided on the housing. A maintenance door is provided on the carbon cavity to replace the activated carbon. A pressure relief valve is provided on the filter box to prevent excessive pressure in the filter box, thereby causing the filtrate to be discharged along the air outlet pipe. When in use, when the medium in the box is used for heat exchange, the high-temperature flue gas can be driven to flow through the first fan in cooperation with the air inlet pipe connected to the flue gas exhaust pipe of the rotary kiln, so that the high-temperature flue gas enters the filter box, and is filtered by the activated carbon and the filtrate added in the filter box, and then the filtered gas can be driven by the second fan to flow to the convection air inlet duct of the drying kiln, and then the gas inhaled by the convection air inlet duct can be heated again and dried in the drying kiln by convection heat transfer; the filtrate in the air duct filter box can absorb the heat from the outer wall of the box for heating, and can also be heated by the heat of the high-temperature flue gas. By adopting the structure of the present application, it is possible to recover and reuse the waste heat on the surface of the rotary kiln through the existing box body, and at the same time recover the waste heat of the high-temperature flue gas discharged from the rotary kiln, so that the hot gas after filtration can flow to the drying kiln again, and cooperate with the corresponding components of the drying kiln for drying, saving the energy of heating the air in the drying kiln, and recovering the waste heat of the high-temperature flue gas; at the same time, the filtrate in the filter box can absorb the waste heat of the outer wall of the box body for heating and heat the high-temperature flue gas when filtering, so that after the temperature of the filtrate is raised, the heat in the high-temperature flue gas is effectively preserved in a variety of ways and better utilized by the drying kiln; and the high-temperature flue gas can be preliminarily purified by the setting of the carbon chamber and activated carbon, so as to avoid more impurities in the flue gas from flowing into the filtrate, thereby increasing the service life of the filtrate; the first fan is arranged on the air inlet pipe between the carbon chamber and the filter box, so as to avoid more impurities from entering and affecting the operation of the first fan.

[0007] Furthermore, a plurality of heat conducting plates are arranged in the filter box, and the other end of the heat conducting plate extends into the box body. The heat conducting plate can accelerate the heating of the filtrate, and at the same time increase the heat exchange area between the filter box and the box body, so that the medium in the box body and the filtrate in the filter box can have a higher heat exchange, so that the heating of the filtrate by the high temperature flue gas can also be absorbed by the medium in the box body, thereby improving the efficiency of waste heat recovery.

[0008] Furthermore, the air outlet pipe is arranged above the filter box. In this way, a space is formed above the filtered liquid in the filter box, so that the second fan and the air outlet pipe arranged above can better drive the flow of the filtered gas.

[0009] Furthermore, the filter box is provided with a liquid level observation window, which can be used to better observe the liquid level of the filtrate and avoid excessive addition and liquid level reduction after heating.

[0010] Furthermore, the filter box is provided with a cleaning door. The cleaning door can be provided and installed on the filter box in any manner, as long as the filtrate can be prevented from flowing out of the cleaning door and it is easy to open. The cleaning door is provided to clean the inside of the filter box.

[0011] Beneficial effects: By adopting the structure of the present application, it is possible to recover and reuse the waste heat on the surface of the rotary kiln through the existing box body, and at the same time recover the waste heat of the high-temperature flue gas discharged from the rotary kiln, so that the hot gas after filtration flows to the drying kiln again, and cooperates with the corresponding components of the drying kiln for drying, saving the energy of heating the air in the drying kiln, and recovering the waste heat of the high-temperature flue gas; at the same time, the filtrate in the filter box can absorb the waste heat of the outer wall of the box body for heating and heat the high-temperature flue gas when filtering, so that after the temperature of the filtrate is raised, the heat in the high-temperature flue gas is effectively preserved in a variety of ways and better utilized by the drying kiln; and the high-temperature flue gas can be preliminarily purified by the setting of the carbon chamber and activated carbon, so as to avoid more impurities in the flue gas from flowing into the filtrate, thereby increasing the service life of the filtrate; the first fan is arranged on the air inlet pipe between the carbon chamber and the filter box, so as to avoid more impurities from entering and affecting the operation of the first fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic cross-sectional view of the filter box of this embodiment;

[0013] Figure 2 It is a side cross-sectional schematic diagram of the filter box of this embodiment;

[0014] Figure 3 It is a front view schematic diagram of the filter box of this embodiment.

[0015] Figure numerals: box body 1, filter box 2, liquid filling port 3, liquid discharge port 4, air inlet pipe 5, air outlet pipe 6, carbon chamber 7, activated carbon 8, first fan 9, second fan 10, heat conduction plate 11, liquid level observation window 12, cleaning door 13. DETAILED DESCRIPTION

[0016] The technical solution of the rotary kiln waste heat recovery device involved in the utility model will be further described in detail below in conjunction with the embodiments.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] like Figure 1 , Figure 2 , Figure 3As shown, the rotary kiln waste heat recovery device of this embodiment includes a box body 1 sleeved on the outer side of the rotary kiln, a filter box 2 is arranged on the outer side of the box body 1, a liquid filling port 3 and a liquid discharge port 4 are opened on the filter box 2, an air inlet pipe 5 and an air outlet pipe 6 are arranged on the filter box 2, the air inlet pipe 5 is connected to the smoke exhaust pipe of the rotary kiln, and the air outlet pipe 6 is connected to the convection air inlet pipe of the drying kiln; a carbon cavity 7 is arranged on the air inlet pipe 5, and activated carbon 8 is arranged in the carbon cavity 7, a first fan 9 is arranged on the air inlet pipe 5 between the carbon cavity 7 and the filter box 2, and a second fan 10 is arranged on the air outlet pipe 6. A plurality of heat conducting plates 11 are arranged in the filter box 2, and the other end of the heat conducting plate 11 extends into the box body 1. The air outlet pipe 6 is arranged above the filter box 2. A liquid level observation window 12 is arranged on the filter box 2. A cleaning door 13 is arranged on the filter box 2. When in use, when the medium in the box 1 is used for heat exchange, the high-temperature flue gas can be driven to flow through the first fan 9 in cooperation with the air inlet pipe 5 connected to the flue gas exhaust pipe of the rotary kiln, so that the high-temperature flue gas enters the filter box 2, and the high-temperature flue gas is filtered by the activated carbon 8 and the filtrate added in the filter box 2, and then the filtered gas can be driven by the second fan 10 to flow to the convection air inlet duct of the drying kiln, and then the gas inhaled by the convection air inlet duct can be heated again and dried in the convection drying kiln by convection heat transfer; the filtrate in the air duct filter box 2 can absorb the heat of the outer wall of the box 1 for heating, and can also be heated by the heat of the high-temperature flue gas. By adopting the structure of the present application, it is possible to recover and reuse the waste heat on the surface of the rotary kiln through the existing box body 1, and at the same time recover the waste heat of the high-temperature flue gas discharged from the rotary kiln, so that the hot gas after filtration can flow to the drying kiln again, and cooperate with the corresponding components of the drying kiln for drying, saving the energy of heating the air in the drying kiln, and recovering the waste heat of the high-temperature flue gas; at the same time, the filtrate in the filter box 2 can absorb the waste heat of the outer wall of the box body 1 for heating and heat the high-temperature flue gas when filtering, so that after the temperature of the filtrate is raised, the heat in the high-temperature flue gas is effectively preserved in various ways and better utilized by the drying kiln; and the high-temperature flue gas can be preliminarily purified by the setting of the carbon chamber 7 and the activated carbon 8, so as to avoid more impurities in the flue gas from flowing into the filtrate, thereby increasing the service life of the filtrate; the first fan 9 is arranged on the air inlet pipe 5 between the carbon chamber 7 and the filter box 2, so as to avoid more impurities from entering and affecting the operation of the first fan 9.

[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotary kiln waste heat recovery device, comprising a housing sleeved on the outer surface of the rotary kiln, characterized in that: A filter box is arranged on the outer surface of the box body, and a liquid filling port and a liquid discharge port are opened on the filter box. An air inlet pipe and an air outlet pipe are arranged on the filter box, and the air inlet pipe is connected with the smoke exhaust pipe of the rotary kiln, and the air outlet pipe is connected with the convection air inlet pipe of the drying kiln; a carbon cavity is arranged on the air inlet pipe, and activated carbon is arranged in the carbon cavity, a first fan is arranged on the air inlet pipe between the carbon cavity and the filter box, and a second fan is arranged on the air outlet pipe.

2. The rotary kiln waste heat recovery device according to claim 1, characterized in that: A plurality of heat conducting plates are arranged in the filter box, and the other ends of the heat conducting plates extend into the box.

3. The rotary kiln waste heat recovery device according to claim 1, characterized in that: The air outlet pipe is arranged above the filter box.

4. The rotary kiln waste heat recovery device according to claim 3, characterized in that: The filter box is provided with a liquid level observation window.

5. The rotary kiln waste heat recovery device according to claim 1, characterized in that: The filter box is provided with a cleaning door.

Images