Flue gas utilization device for material receiving point of circular cooler

Abstract

A flue gas utilization device for a material receiving point of a circular cooler comprises the circular cooler and further comprises a gravity dust collector and a waste heat boiler which are installed at an outlet of an upper cover of the circular cooler, an inlet below the waste heat boiler is connected with the gravity dust collector, a medium outlet above the waste heat boiler is connected with a waste gas pipeline, the waste gas pipeline is communicated with an air bellow of the circular cooler, and a circulating fan is installed on the waste gas pipeline. A steam pipeline of the waste heat boiler communicates with the mixture ore groove so that materials in the mixture ore groove can be heated through steam of the waste heat boiler, and the receiving hopper is installed above the annular cooler and embedded into the annular cooler. The invention provides the flue gas utilization device for the material receiving point of the circular cooler, and the flue gas utilization device for the material receiving point of the circular cooler can be used for effectively treating high-temperature dust and improving the flue gas recycling efficiency, so that not only is the problem of waste heat utilization of high-temperature flue gas solved, but also the environmental protection problem that the discharged flue gas does not reach the standard is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical engineering, relates to supporting equipment for sintering process, and specifically relates to a fume utilization device at a receiving point of a ring cooler. Background Art

[0002] The ring cooler is a key equipment for cooling high-temperature sintered cakes. When the high-temperature sintered cakes are spread onto the ring cooler trolley through the receiving hopper of the ring cooler, a large amount of high-temperature dust will be generated and mixed with the high-temperature exhaust gas from the top of the trolley to form dusty high-temperature flue gas. If these flue gases are discharged directly, they cannot meet environmental protection requirements, so they must be treated. The existing technical means are: a dust removal and purification system composed of a dust collector, a dust removal fan, a silencer, an exhaust pipe, a pipeline, and a dust pneumatic conveying device. The high-temperature flue gas is led out from the upper cover of the ring cooler by a dust removal fan. After purification by the dust collector, the dust concentration reaches the emission standard, and the high-temperature flue gas becomes high-temperature exhaust gas, which is directly discharged from the exhaust pipe into the atmosphere. The dust removed by the dust collector is sent to the existing sintering batching system by a pneumatic conveying device, but the existing technology does not set up an exhaust gas circulation system to fully utilize the high-temperature exhaust gas.

[0003] In the prior art, a variety of patents related to the present invention have been proposed and applied in the field of metallurgical engineering technology. For example, patent CN101403571A discloses a method and system for recycling flue gas from an annular cooler, and an annular cooler. This scheme collects medium-temperature flue gas at a certain temperature and heat-exchanges it with high-temperature materials to discharge high-temperature flue gas at a very high temperature, and then collects this part of the high-temperature flue gas for reuse in power generation, water heating, etc., thereby achieving the technical effect of effectively improving the efficiency of flue gas utilization. Although the above patent recycles the flue gas, it does not remove dust and purify the high-temperature flue gas. If these flue gases are discharged directly, they cannot meet environmental protection requirements. Summary of the invention

[0004] In order to overcome the problem that the high-temperature flue gas discharged by the existing ring cooler cannot meet the environmental protection requirements and cannot be effectively utilized, the present invention provides a flue gas utilization device at the receiving point of the ring cooler. The flue gas utilization device at the receiving point of the ring cooler can effectively process high-temperature dust and improve the efficiency of flue gas recycling. It not only solves the problem of waste heat utilization of high-temperature flue gas, but also overcomes the environmental protection problem of substandard flue gas emissions.

[0005] The above object of the present invention is achieved through the following technical solutions:

[0006] A flue gas utilization device for a ring cooler receiving point comprises a ring cooler, and also comprises a gravity dust collector and a waste heat boiler installed at the outlet of the upper cover of the ring cooler. The lower inlet of the waste heat boiler is connected to the gravity dust collector, and the upper medium outlet of the waste heat boiler is connected to the exhaust gas pipe. The exhaust gas pipe is connected to the return ring cooler bellows, and a circulating fan is installed on the exhaust gas pipe. The steam pipe of the waste heat boiler is connected to the mixed material trough so that the material in the mixed material trough is heated by the steam of the waste heat boiler. The receiving hopper is installed above the ring cooler and embedded in the ring cooler.

[0007] Furthermore, a regulating valve, a cold air valve and a temperature detection device are installed on the exhaust gas pipeline, and the regulating valve, the cold air valve and the temperature detection device are all electrically connected to the controller; the gravity dust collector and the waste heat boiler constitute a dust removal and purification system; the steam drum, the mixed material trough, the steam nozzle and the steam pipeline constitute a steam utilization system; the regulating valve, the cold air valve, the circulating fan, the temperature detection device and the exhaust gas pipeline constitute an exhaust gas circulation system.

[0008] Furthermore, the circulating fan is variable frequency speed regulated, and the circulating fan introduces high-temperature flue gas into the dust removal and purification system, and introduces the low-temperature exhaust gas formed after purification into the exhaust gas pipe. The low-temperature exhaust gas returns to the bellows of the ring cooler after passing through the circulating fan to cool the high-temperature sintered cake again.

[0009] Furthermore, the regulating valve and the cooling air valve adjust the exhaust gas content and air content flowing into the exhaust gas circulation system. During normal production, the cooling air valve is not opened. When there is a short-term production fluctuation and the temperature detection device detects that the temperature of the purified circulating exhaust gas exceeds the limit value and affects the cooling effect of the sintered cakes, the controller controls the cooling air valve to open automatically and introduces natural air to lower the circulating exhaust gas temperature. When the temperature detection device detects that the exhaust gas temperature is lower than the limit value, the controller controls the cooling air valve to close automatically.

[0010] Furthermore, the steam pipeline of the waste heat boiler is connected to the steam drum, and the outlet of the steam drum is connected to the steam nozzle on the mixed material trough, and the steam is sprayed into the mixed material in the mixed material trough through the steam nozzle to heat it.

[0011] Furthermore, the outer surfaces of the steam drum, the mixed material trough, the steam nozzle, the steam pipe and the exhaust gas pipe are all provided with thermal insulation materials.

[0012] Furthermore, the steam nozzles are provided in plurality and are arranged in a radial ring along the mixed material trough.

[0013] The beneficial effects of the present invention compared with the prior art solutions are:

[0014] 1. Eliminate pipe wear in front of the dust collector: This application optimizes the dust removal system by directly adding a gravity dust collector and a waste heat boiler at the outlet of the upper cover of the annular cooler, eliminating the pipe in front of the dust collector inlet, eliminating pipe wear in front of the dust collector, and improving the operation rate of the dust removal and purification system.

[0015] 2. The dust treatment system is simple: The gravity dust collector and waste heat boiler added in this application both have dust removal functions and are directly connected to the outlet of the ring cooler upper cover. Therefore, the removed dust will fall directly back onto the ring cooler trolley. There is no need to add an additional dust treatment system, which occupies a small area, has a simple system, and improves the operation rate of the purification system.

[0016] 3. Utilization of waste heat from high-temperature flue gas: This application adds a waste heat boiler to produce steam using waste heat from flue gas. At the same time, a steam utilization system is added to introduce steam into the sintering mixed material trough to heat the material, increase the material temperature, realize the utilization of waste heat from high-temperature flue gas, and save energy.

[0017] 4. Recycling of waste gas to reduce environmental pollution: After dust removal and heat exchange, high-temperature flue gas becomes low-dust low-temperature waste gas, which is returned to the ring cooler through the circulating fan to cool the material, realizing the recycling of waste gas without external discharge and reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] In the figure, 1, ring cooler; 2, gravity dust collector; 3, waste heat boiler; 4, regulating valve; 5, circulating fan; 6, cooling air valve; 7, steam drum; 8, mixed material trough; 9, steam nozzle; 10, receiving hopper; 11, temperature detection device. DETAILED DESCRIPTION

[0020] The present invention is described in detail below through specific embodiments, but the protection scope of the present invention is not limited thereto.

[0021] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0022] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] Example 1

[0024] The present embodiment provides a flue gas utilization device at a receiving point of a ring cooler, comprising a ring cooler 1; a gravity dust collector 2 and a waste heat boiler 3 installed at the outlet of an upper cover of the ring cooler 1, the lower inlet of the waste heat boiler 3 is connected to the gravity dust collector 2, a regulating valve 4, a cooling air valve 6, a circulating fan 5, and a temperature detection device 11 are installed on the exhaust gas pipeline above the waste heat boiler 3, the steam pipeline of the waste heat boiler 3 is connected to a steam drum 7, the outlet of the steam drum 7 is connected to a steam nozzle 9 on a mixed material ore trough 8, and a receiving hopper 10 is installed above the ring cooler 1 and embedded in the ring cooler 1.

[0025] The gravity dust collector 2 reduces the dust content in the high-temperature smoke. The high-temperature dust in the high-temperature smoke falls back onto the trolley of the ring cooler 1 under the action of gravity through the gravity dust collector 2, and the high-temperature dust is separated from the high-temperature smoke to form a high-temperature exhaust gas with a lower dust content.

[0026] The waste heat boiler 3 includes at least two outlet pipes, including an exhaust gas pipe and a steam pipe. After the high-temperature exhaust gas enters the waste heat boiler 3 for heat exchange, low-temperature exhaust gas is formed, and the low-temperature exhaust gas flows into the exhaust gas pipe; after the high-temperature exhaust gas enters the waste heat boiler for heat exchange, the steam generated by the waste heat boiler 3 flows into the steam pipe.

[0027] The steam drum 7 collects and stores the steam generated by the waste heat boiler 3, balances the steam pressure of the steam utilization system, and ensures the normal operation of the steam utilization system.

[0028] Compared with the prior art, the present invention has made significant improvements and innovations in flue gas utilization. By optimizing the dust removal device, the present invention not only solves the problem of high-temperature flue gas waste heat utilization, but also overcomes the environmental protection problem of flue gas discharge not meeting the standards. In addition, the present invention also shows obvious advantages in dust treatment, such as the dust treatment system occupies a small area, the system is simple, and the operation rate of the dust removal and purification system is improved.

[0029] The working principle of the flue gas utilization device at the receiving point of the ring cooler described in the present invention is as follows:

[0030] The high-temperature flue gas generated when the receiving hopper 10 of the ring cooler 1 is discharged is purified by the gravity dust collector 2 and the waste heat boiler 3, and becomes low-temperature waste gas with less dust content, which is led back to the bellows of the ring cooler 1 by the circulating fan 5 to cool the high-temperature sintered cake again, so that the waste gas is recycled and not discharged. At the same time, the high-temperature flue gas undergoes heat exchange in the waste heat boiler 3, and the steam generated is sent to the sintering mixed material trough 8 to heat the material, so as to realize the waste heat utilization.

[0031] The working process of the flue gas utilization device at the receiving point of the ring cooler described in the present invention is as follows:

[0032] When the high-temperature sintered cake is spread onto the ring cooler trolley through the receiving hopper 10 of the ring cooler 1, a large amount of high-temperature dust will be generated and mixed with the high-temperature exhaust gas above the ring cooler trolley 1 to form dusty high-temperature flue gas. Under the action of the circulating fan 5, the high-temperature flue gas enters the gravity dust collector 2 directly connected to the upper cover of the ring cooler 1 for dust removal. The dust collected by the gravity dust collector 2 falls back to the trolley of the ring cooler 1 under the action of gravity. The high-temperature flue gas after dust removal becomes high-temperature exhaust gas with low dust content and enters the waste heat boiler 3.

[0033] After the high-temperature exhaust gas enters the waste heat boiler 3 for heat exchange, the temperature of the exhaust gas decreases, and the dust contained is further removed by the boiler. The dust falls back to the trolley of the ring cooler 1 due to gravity. At this time, the high-temperature exhaust gas becomes low-temperature exhaust gas with lower dust content. The low-temperature exhaust gas is led out from the outlet of the waste heat boiler 3 by the circulating fan 5 and sent back to the bellows of the ring cooler 1 to cool the high-temperature sintered cakes again to achieve the recycling of the exhaust gas. The circulating fan 5 is variable frequency speed regulation. At the same time, the regulating valve 4, the cooling air valve 6, and the temperature detection device 11 are installed on the pipeline. The exhaust gas volume can be adjusted and natural air can be added according to the actual situation to ensure the stable operation of the wind system. Among them, during normal production, the cooling air valve 6 is not opened. When the production fluctuates for a short time, the temperature detection device 11 detects that the temperature of the purified circulating exhaust gas exceeds the limit value and affects the cooling effect of the sintered cake, the cooling air valve 6 automatically opens to introduce natural air to reduce the temperature of the circulating exhaust gas. When the temperature detection device 11 detects that the exhaust gas temperature is less than the limit value, the cooling air valve 6 automatically closes.

[0034] After the high-temperature exhaust gas enters the waste heat boiler 3 for heat exchange, the steam generated by the waste heat boiler 3 is sent to the steam drum 7 through the pipeline. The outlet of the steam drum 7 is connected to the steam nozzle 9 installed on the mixed material trough 8. The steam is sprayed into the mixed material through the steam nozzle 9 to heat it. In order to prevent steam condensation, the outer surfaces of the steam drum 7, the mixed material trough 8, the steam nozzle 9, and all steam pipes are provided with heat-insulating materials. In order to ensure uniform heating of the materials, the steam nozzle 9 is arranged in a radial ring along the mixed material trough 8.

[0035] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A flue gas utilization device for a ring cooler receiving point, comprising a ring cooler (1), characterized in that: It also includes a gravity dust collector (2) and a waste heat boiler (3) installed at the outlet of the upper cover of the ring cooler (1); the lower inlet of the waste heat boiler (3) is connected to the gravity dust collector (2); the upper medium outlet of the waste heat boiler (3) is connected to the exhaust gas pipeline; the exhaust gas pipeline is connected to the wind box of the return ring cooler (1); a circulating fan (5) is installed on the exhaust gas pipeline; the steam pipeline of the waste heat boiler (3) is connected to the mixed material trough (8) so that the material in the mixed material trough (8) is heated by the steam of the waste heat boiler (3); and the receiving hopper (10) is installed above the ring cooler (1) and embedded in the ring cooler (1).

2. The device for utilizing flue gas at the receiving point of an annular cooler according to claim 1, characterized in that: The waste gas pipeline is also equipped with a regulating valve (4), a cold air valve (6), and a temperature detection device (11), and the regulating valve (4), the cold air valve (6), and the temperature detection device (11) are all electrically connected to the controller; the gravity dust collector (2) and the waste heat boiler (3) constitute a dust removal and purification system; the steam drum (7), the mixed material trough (8), the steam nozzle (9) and the steam pipeline constitute a steam utilization system; the regulating valve (4), the cold air valve (6), the circulating fan (5), the temperature detection device (11) and the waste gas pipeline constitute a waste gas circulation system.

3. The device for utilizing flue gas at the receiving point of an annular cooler according to claim 1, characterized in that: The circulating fan (5) is variable frequency speed regulated, and introduces the high-temperature flue gas into the dust removal and purification system, and introduces the low-temperature waste gas formed after purification into the waste gas pipeline. The low-temperature waste gas flows back into the bellows of the ring cooler (1) after passing through the circulating fan (5), and the high-temperature sintered cakes are cooled again.

4. The device for utilizing flue gas at the receiving point of an annular cooler according to claim 2, characterized in that: The regulating valve (4) and the cooling air valve (6) regulate the waste gas content and air content flowing into the waste gas circulation system. During normal production, the cooling air valve (6) is not opened. When there is a short-term production fluctuation and the temperature detection device (11) detects that the temperature of the purified circulating waste gas exceeds a limit value and affects the cooling effect of the sintered cakes, the controller controls the cooling air valve (6) to open automatically and introduces natural air to reduce the circulating waste gas temperature. When the temperature detection device (11) detects that the waste gas temperature is less than a limit value, the controller controls the cooling air valve (6) to close automatically.

5. The device for utilizing flue gas at the receiving point of an annular cooler according to claim 1, characterized in that: The steam pipeline of the waste heat boiler (3) is connected to the steam drum (7), the outlet of the steam drum (7) is connected to the steam nozzle (9) on the mixed material trough (8), and the steam is sprayed into the mixed material in the mixed material trough (8) through the steam nozzle (9) to heat it.

6. The device for utilizing flue gas at the receiving point of an annular cooler according to claim 5, characterized in that: The outer surfaces of the steam drum (7), the mixed material trough (8), the steam nozzle (9), the steam pipeline and the exhaust gas pipeline are all provided with heat-insulating materials.

7. A flue gas utilization device for a ring cooler receiving point according to claim 5 or 6, characterized in that: The steam nozzles (9) are provided in plurality and are arranged in a radial annular manner along the mixed material trough (8).

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