Iron oxide calcining furnace oxygen supply device

Abstract

The utility model discloses an iron oxide calcinator oxygen supply device belongs to calcinator technical field, and this device includes first heat exchanger, dust removal subassembly and gas supply tank, is connected with first air inlet pipe and first air outlet pipe on first heat exchanger, and gas supply tank is connected with first air inlet pipe, and dust removal subassembly includes cyclone dust collector and dust collecting box, and first heat exchanger is connected with cyclone dust collector through first air outlet pipe, and is connected with gas supply pipe on cyclone dust collector, and still is connected with the first liquid inlet pipe and first liquid outlet pipe for accessing heat exchange liquid on first heat exchanger. The utility model improves the oxygen content in air without increasing the air volume, and sets up dust removal subassembly, can make oxygen and air fully mix, can utilize cyclone dust collector to remove the dust in air simultaneously, prevents the air of too low temperature from directly entering calcinator and influences combustion stability, can utilize external heat source such as flue gas to heat heat exchange liquid, and energy -conserving and consumption -reducing.

Description

Technical Field

[0001] This utility model belongs to the field of calcining furnace technology, specifically relating to an oxygen supply device for an iron oxide calcining furnace. Background Technology

[0002] The production process of iron oxide pigments requires calcination in a calcining furnace. The purpose of calcination is to burn off useless components and impurities in the raw materials and convert them into iron oxide. When the calcining furnace is working, the flow rate of the combustion fan can be adjusted to regulate the amount of combustion air (such as air or oxygen-enriched air) in the furnace, thereby controlling the oxygen content in the furnace and avoiding excessive oxidation or reduction. The air volume and oxygen content in the furnace also affect the combustion quality of the fuel. Currently, in order to increase the oxygen content in the furnace, it is generally necessary to increase the air volume. If the air volume is too large, excessive air will enter the furnace and carry away a large amount of heat, affecting the thermal efficiency of the calcining furnace. Utility Model Content

[0003] The technical problem solved by this utility model is to provide an oxygen supply device for an iron oxide calcining furnace, which can increase the oxygen content in the air without increasing the air supply volume.

[0004] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An oxygen supply device for an iron oxide calcining furnace includes a first heat exchanger, a dust removal assembly, and a gas supply tank. The first heat exchanger is connected to a first air inlet pipe and a first air outlet pipe. The gas supply tank is connected to the first air inlet pipe. The dust removal assembly includes a cyclone dust collector and a dust collection box connected to the bottom of the cyclone dust collector. The first heat exchanger is connected to the cyclone dust collector through the first air outlet pipe. The cyclone dust collector is connected to a gas supply pipe connected to a combustion fan. The first heat exchanger is also connected to a first liquid inlet pipe and a first liquid outlet pipe for receiving heat exchange liquid.

[0006] Furthermore, the first air inlet pipe is connected to the first air outlet pipe via a bypass pipe, and the bypass pipe is equipped with a bypass valve.

[0007] Furthermore, the first heat exchanger is connected to a liquid storage tank, and the liquid storage tank is connected to the second heat exchanger via a circulation pump.

[0008] Furthermore, the second heat exchanger is provided with a second inlet pipe and a second outlet pipe for receiving the heat exchange liquid. The circulating pump is connected to the second inlet pipe, and the second outlet pipe is connected to the first inlet pipe.

[0009] Furthermore, the second heat exchanger is provided with a second air inlet pipe and a second air outlet pipe.

[0010] Furthermore, a first oxygen content sensor is installed on the gas supply pipe.

[0011] Furthermore, a first filter screen is provided on the first air outlet duct.

[0012] Furthermore, the cyclone dust collector includes a straight cylindrical body connected to the air supply pipe, a conical body connected to the straight cylindrical body, and an air inlet pipe connected to the straight cylindrical body.

[0013] Furthermore, a first temperature sensor is provided on the first air outlet pipe or air inlet pipe, and the first temperature sensor is located downstream of the first filter screen in the airflow direction.

[0014] Furthermore, the cyclone dust collector is provided with a first insulation layer.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0016] 1. By setting up an air supply tank containing oxygen, the oxygen can be mixed with air to increase the oxygen content in the air entering the calcining furnace. This increases the oxygen content in the air without increasing the air volume. In addition, a dust removal component is set up to ensure that the oxygen and air are fully mixed, while a cyclone dust collector can be used to remove dust from the air.

[0017] 2. The first heat exchanger is set up to heat the air entering the calcining furnace using the heat exchange liquid, preventing air with too low a temperature from directly entering the calcining furnace and affecting the combustion stability. A bypass pipe is set up to regulate the air temperature using the air branch.

[0018] 3. The system is equipped with a liquid storage tank, a circulating pump, and a second heat exchanger, which can utilize external heat sources such as flue gas to heat the heat exchange liquid, saving energy and reducing consumption. Furthermore, the flue gas does not directly heat the air, eliminating the potential hazard of flue gas leakage directly entering the air. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the device structure according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the connection structure of the first heat exchanger, air supply tank and liquid storage tank in the embodiment;

[0021] Figure 3 This is a schematic diagram of the dust removal component structure in an embodiment;

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the cyclone dust collector in the embodiment;

[0023] Figure 5 This is a schematic diagram of the second heat exchanger structure in the embodiment. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0025] like Figure 1 and Figure 2 As shown, an oxygen supply device for an iron oxide calcining furnace includes a first heat exchanger 1, a dust removal component 2, an air supply tank 3, a liquid storage tank 4, a circulating pump 5, and a second heat exchanger 6. The first heat exchanger 1 adopts an existing plate-fin heat exchanger. The first heat exchanger 1 is connected to a first air inlet pipe 11 and a first air outlet pipe 12. The first air inlet pipe 11 is used to introduce external air. After entering the first heat exchanger 1, the air is discharged from the first air outlet pipe 12. The first heat exchanger 1 is also connected to a first liquid inlet pipe 13 and a first liquid outlet pipe 14. The first liquid inlet pipe 13 is used to introduce heat exchange liquid. After entering the first heat exchanger 1, the heat exchange liquid exchanges heat with the air entering through the first air inlet pipe 11. After heating the air, the heat exchange liquid is discharged from the first liquid outlet pipe 14.

[0026] like Figure 1 , Figure 3 and Figure 4 As shown, the first heat exchanger 1 is connected to the dust removal assembly 2. The dust removal assembly 2 includes a cyclone dust collector 21 and a dust collection box 22. The cyclone dust collector 21 includes a straight cylindrical body 211, a conical body 212, and an inlet pipe 213. The straight cylindrical body 211 is a closed cylinder at the top. The conical body 212 is connected to the lower end of the straight cylindrical body 211. The inlet pipe 213 is connected to the side wall of the straight cylindrical body 211 and is tangentially connected to the straight cylindrical body 211. The first heat exchanger 1 is connected to the inlet pipe 213 of the cyclone dust collector 21 through the first outlet pipe 12, thereby heating the air through the first heat exchanger 1. Afterwards, the air enters the cyclone dust collector 21. The air supply pipe 23 is inverted L-shaped. The lower end of the air supply pipe 23 penetrates the top wall of the straight cylinder 211 and enters the straight cylinder 211. The height of the lower end of the air supply pipe 23 is lower than the height of the inlet pipe 213. After the air enters the cyclone dust collector 21 from the inlet pipe 213, the air passes through the cyclone dust collector. The dust particles in the air are thrown to the inner wall under the action of centrifugal force, and then slide down the inner wall of the cone 212 to the dust collection box 22. The purified gas is discharged upward through the air supply pipe 23. The air supply pipe 23 is connected to the combustion fan of the calcining furnace. The air discharged from the air supply pipe 23 enters the calcining furnace to participate in combustion under the action of the combustion fan.

[0027] like Figure 1 and Figure 2As shown, a bypass pipe 111 is connected to the first air inlet pipe 11, bypassing the first heat exchanger 1. The first air inlet pipe 11 is directly connected to the first air outlet pipe 12 via the bypass pipe 111. A bypass valve 112 is provided on the bypass pipe 111. The bypass valve 112 is an existing butterfly valve, which can adjust the opening size and control the opening and closing of the bypass pipe 111. A first filter screen 122 is provided on the first air outlet pipe 12. The first filter screen 122 is located at the end of the first air outlet pipe 12 for preliminary air filtration. The filter screen 122 has a filter aperture of 1mm. A first temperature sensor 121 is provided on the air inlet pipe 213. The first temperature sensor 121 is located downstream of the first filter screen 122 in the airflow direction. The bypass pipe 111 is not heated by the first heat exchanger 1, so its temperature is lower. It can mix with the air heated by the first heat exchanger 1, thereby reducing the temperature of the air discharged from the first air outlet pipe 12. 121 uses an existing air temperature sensor, such as the Tiankang WRF-73A intake air temperature sensor, with a measurement range of 0℃~800℃. The first temperature sensor 121 can measure the air temperature discharged from the first outlet pipe 12. The opening degree of the bypass valve 112 can adjust the air flow of the bypass pipe 111, thereby adjusting the air temperature discharged from the first outlet pipe 12. Thus, the air temperature entering the calcining furnace is adjustable. The cyclone dust collector 21 is provided with a first insulation layer 210, which uses existing insulation cotton to keep the air inside the cyclone dust collector 21 warm.

[0028] like Figure 1 and Figure 2 As shown, the gas supply tank 3 is connected to the first air inlet pipe 11 via an oxygen supply pipeline 31. An oxygen supply valve 311 is installed on the oxygen supply pipeline 31, using an existing solenoid valve to control the opening and closing of the oxygen supply pipeline 31. The gas supply tank 3 stores oxygen with an oxygen concentration ≥90%. The gas supply tank 3 is connected to an external industrial oxygen generator. The industrial oxygen generator uses an existing PSA oxygen generator, such as the ZW-200 oxygen generator from Shandong Zhiwei Environmental Protection Technology Co., Ltd. This generator uses zeolite molecular sieves as adsorbents and utilizes the difference in adsorption amounts of oxygen and nitrogen on the surface of the molecular sieve in compressed air. Through the principle of pressure adsorption and pressure desorption, oxygen is directly produced from compressed air, with an oxygen production rate of 1–300 NM. 2 / H, oxygen purity: 93% ± 3%, oxygen pressure: 0.01~0.6MPa. After the oxygen in the gas supply tank 3 enters the first air inlet pipe 11, it increases the oxygen content in the air. Furthermore, during the flow through the first heat exchanger 1 and cyclone dust collector 21, it is thoroughly and evenly mixed with the air, thereby increasing the oxygen content of the air entering the calcining furnace. A first oxygen content sensor 231 is installed on the gas supply pipe 23. The first oxygen content sensor 231 uses an existing oxygen sensor, such as the Jingxun Changtong JXBS-3005-O2 pipeline oxygen transmitter, which can measure the oxygen content of the air in the gas supply pipe 23, i.e., the oxygen content of the air entering the calcining furnace.

[0029] like Figure 1 , Figure 2 and Figure 5 As shown, the first outlet pipe 14 of the first heat exchanger 1 is connected to the storage tank 4 via the drain pipe 141. The storage tank 4 stores heat exchange liquid, such as heat transfer oil. The storage tank 4 is connected to the second inlet pipe 63 of the second heat exchanger 6 via the circulation pump 5. The second heat exchanger 6 also adopts the existing plate-fin heat exchanger. The second heat exchanger 6 is provided with a second inlet pipe 63 and a second outlet pipe 64 for receiving the heat exchange liquid. The liquid in the storage tank 4 is transported to the second heat exchanger 6 via the circulation pump 5. The second heat exchanger 6 is provided with a second air inlet pipe 61 and a second air outlet pipe. 62. The second air inlet pipe 61 is connected to the flue gas pipeline of the calcining furnace, introducing the high-temperature flue gas into the second heat exchanger 6, thereby exchanging heat with the liquid in the second heat exchanger 6 to heat the liquid. The flue gas is discharged from the second air outlet pipe 62. The second liquid outlet pipe 64 is connected to the first liquid inlet pipe 13. The heated liquid enters the first heat exchanger 1 from the second liquid outlet pipe 64 and the first liquid inlet pipe 13. Since the flue gas does not directly exchange heat with the air, but is indirectly heated, the liquid is used as an intermediate carrier for indirect heating, eliminating the hidden danger of flue gas directly entering the air from the heat exchanger when the heat exchanger leaks.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An oxygen supply device for an iron oxide calcining furnace, characterized in that, The system includes a first heat exchanger (1), a dust removal assembly (2), and an air supply tank (3). The first heat exchanger (1) is connected to a first air inlet pipe (11) and a first air outlet pipe (12). The air supply tank (3) is connected to the first air inlet pipe (11). The dust removal assembly (2) includes a cyclone dust collector (21) and a dust collection box (22) connected to the bottom of the cyclone dust collector (21). The first heat exchanger (1) is connected to the cyclone dust collector (21) through the first air outlet pipe (12). The cyclone dust collector (21) is connected to an air supply pipe (23) connected to a combustion fan. The first heat exchanger (1) is also connected to a first liquid inlet pipe (13) and a first liquid outlet pipe (14) for receiving heat exchange liquid.

2. The oxygen supply device for the iron oxide calcining furnace according to claim 1, characterized in that, The first air inlet pipe (11) is connected to the first air outlet pipe (12) through a bypass pipe (111), and a bypass valve (112) is provided on the bypass pipe (111).

3. The oxygen supply device for the iron oxide calcining furnace according to claim 2, characterized in that, The first heat exchanger (1) is connected to the liquid storage tank (4), and the liquid storage tank (4) is connected to the second heat exchanger (6) through the circulation pump (5).

4. The oxygen supply device for the iron oxide calcining furnace according to claim 3, characterized in that, The second heat exchanger (6) is provided with a second inlet pipe (63) and a second outlet pipe (64) for receiving heat exchange liquid. The circulating pump (5) is connected to the second inlet pipe (63), and the second outlet pipe (64) is connected to the first inlet pipe (13).

5. The oxygen supply device for the iron oxide calcining furnace according to claim 3, characterized in that, The second heat exchanger (6) is provided with a second air inlet pipe (61) and a second air outlet pipe (62).

6. The oxygen supply device for the iron oxide calcining furnace according to claim 1, characterized in that, The gas supply pipe (23) is equipped with a first oxygen content sensor (231).

7. The oxygen supply device for the iron oxide calcining furnace according to claim 1, characterized in that, The first air outlet pipe (12) is equipped with a first filter screen (122).

8. The oxygen supply device for the iron oxide calcining furnace according to claim 1, characterized in that, The cyclone dust collector (21) includes a straight cylindrical body (211) connected to the air supply pipe (23), a conical body (212) connected to the straight cylindrical body (211), and an air inlet pipe (213) connected to the straight cylindrical body (211).

9. The oxygen supply device for the iron oxide calcining furnace according to claim 1, characterized in that, A first temperature sensor (121) is provided on the first air outlet pipe (12) or air inlet pipe (213), and the first temperature sensor (121) is located downstream of the first filter screen (122) in the airflow direction.

10. The oxygen supply device for the iron oxide calcining furnace according to claim 1, characterized in that, The cyclone dust collector (21) is provided with a first insulation layer (210).

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