Anti-blocking dust removal system of sintering mixer

Abstract

The utility model belongs to the technical field of dust removal of sintering mixers, and particularly relates to an anti-blocking dust removal system of a sintering mixer. The technology comprises a bag type dust collector, the air inlet end of the bag type dust collector is connected with a dust removal pipeline communicated with the bag type dust collector, the air inlet end of the dust removal pipeline is sequentially connected with a hot air pipeline and a dust removal branch pipe through a mixing tee joint, and the air inlet end of the dust removal branch pipe is provided with a flue gas collecting hood for collecting flue gas of the sintering mixer into the dust removal branch pipe. A heating device for heating the dust removal branch pipe is arranged on the dust removal branch pipe; and the hot air pipeline is connected with a cold air pipeline for supplying cold air to the hot air pipeline. The system solves the problem of blockage of a dust removal branch pipe in the prior art, and also prevents the problem that dust entrained in hot air is deposited in a hot air pipeline due to too low flow velocity.

Description

Technical Field

[0001] The utility model belongs to the technical field of dust removal for sintering mixers, and particularly relates to an anti-blocking dust removal system for sintering mixers. Background Art

[0002] During the raw material batching stage of sintering, the quicklime digestion process is generally adopted, that is, quicklime (CaO) is added with water and undergoes a chemical reaction with water to produce slaked lime (CaOH). The heat generated by the digestion of quicklime will produce a large amount of water vapor. While the water vapor diffuses outward, it will entrain a large amount of dust, causing pollution to the surrounding environment. The characteristics of the dust are: high humidity, high viscosity, light dust, and fine particles. When this saturated dust-containing gas enters the dust removal pipeline, the water vapor will condense into water on the pipe wall with a lower temperature. The mixture of water and dust is in a colloidal state with a large cohesive force, which is easy to block the dust removal pipeline and even damage the dust removal equipment, affecting the normal operation of the dust removal system. If not cleaned, the entire dust removal system will be paralyzed in a very short time.

[0003] Currently, the existing mainstream treatment solution is to adopt a wet dust removal system. In the dust removal pipeline, a large amount of spraying is carried out by using atomizing nozzles to dilute the concentration of slaked lime and wash away part of the dust deposited in the pipeline, so as to extend the time when the pipeline is blocked. The dust collector purifies the flue gas by adopting the wet dust removal or the combination of wet dust removal and wet electrostatic dust removal. All these solutions use water to dilute the dust concentration on the inner wall of the pipe or the inner surface of the equipment and wash away part of the dust deposited in the pipeline to achieve the purpose of extending the blocking time of the pipeline and equipment. However, such wet dust removal has the following disadvantages:

[0004] (1) It is impossible to completely eliminate the blockage of the pipeline and equipment. After the pipeline and the dust removal equipment are blocked, hard stalactite-like substances are formed, which are difficult to clean. (2) A large amount of sewage is generated during the operation. Although a part of it can be recycled, there is still a large amount of sewage that needs to be recycled through the mixer. The sewage also contains CaOH dust, which is easy to block the spray water pipe of the mixer. (3) Except for the wet electrostatic dust collector, the purification efficiency of other wet dust collectors is not high and it is difficult to meet the requirement of dust up-to-standard discharge. It is necessary to increase the dust removal air volume to reduce the dust concentration at the inlet of the dust collector, wasting energy.

[0005] In view of the above problems, through patent retrieval, a patent was found with the authorized announcement number CN212039447U and the patent name "A dust removal device for a sintering mixing system". The technical solution of this device includes: a bag filter, which is provided with an air inlet, an air outlet and an ash discharge port, and an induced draft fan is provided at the air outlet of the bag filter; a sintering mixer, which is provided with a flue gas outlet, and the flue gas outlet is connected to the air inlet of the bag filter through a dust removal pipeline; a ring cooler, the end of the ring cooler is connected to the dust removal pipeline through a flue gas pipe; when the induced draft fan is turned on, the sintering mixer flue gas and the hot flue gas at the end of the ring cooler are introduced into the dust removal pipeline, and the sintering mixer flue gas and the hot flue gas at the end of the ring cooler are mixed in the dust removal pipeline and then enter the bag filter for dust removal.

[0006] The above patent technology uses the hot air of the ring cooler to mix with the dust removal flue gas of the sintering mixer, so that the temperature of the mixed flue gas reaches a certain temperature to remove the liquid water in the mixed flue gas, and at the same time avoids condensation on the surface of pipelines and equipment (when condensation occurs, the main influencing factors of the dew point temperature of the flue gas are flue gas temperature, pressure, composition, etc. The dew point temperature is the temperature at which water vapor in the air reaches the saturation state.), fundamentally solving the problem of blockage of the dust collector. However, this solution has the following disadvantages:

[0007] (1) It only solves the problem of blockage of the main dust removal pipe and the dust collector of the mixed flue gas after mixing. There is no anti-blocking measure for the dust removal branch pipe of the mixer, and the blockage of the dust removal pipeline (referred to as the branch pipe section) between the connection of the flue gas pipe and the dust removal pipeline to the sintering mixer is not solved. And this branch pipe section is the first passing section of the flue gas from the sintering mixer. When the temperature is lower than the dew point value, condensation is likely to occur, resulting in the inability to implement this patent technology normally.

[0008] (2) The situation when the heat source temperature is too high is not considered. When the heat source temperature rises, the required hot air volume will decrease. When the hot air volume decreases to a certain value, the dust entrained in the hot air will deposit in the hot air pipeline due to too low flow velocity. Utility Model Content

[0009] According to the deficiencies in the above prior art, the technical problem to be solved by the present utility model is: to provide an anti-blocking dust removal system for a sintering mixer, which solves the problem of blockage of the dust removal branch pipe in the prior art, and at the same time prevents the dust entrained in the hot air from depositing in the hot air pipeline due to too low flow velocity.

[0010] The described anti-blocking dust removal system for a sintering mixer includes a bag filter. The inlet end of the bag filter is connected to a dust removal pipeline that communicates with it. The inlet end of the dust removal pipeline is sequentially connected to a hot air pipeline and a dust removal branch pipe through a mixing tee. The inlet end of the dust removal branch pipe is equipped with a flue gas collector hood that collects the sintering mixer flue gas into the dust removal branch pipe. A heating device for heating the dust removal branch pipe is provided on the dust removal branch pipe; a cold air pipeline for supplying cold air to the hot air pipeline is connected to the hot air pipeline.

[0011] After the heating device is added to the dust removal branch pipe in this system, the heating device can heat the inner wall temperature of the dust removal branch pipe above the dew point temperature. The heat source of the heating device can use steam or hot water, etc. This can effectively prevent the inner wall of the dust removal branch pipe from condensing and causing blockage. The final temperature of the gas in the dust removal branch pipe and the hot air pipeline reaches above the dew point temperature after mixing and confluence. The mixed flue gas enters the bag filter for purification treatment. Under the design of the cold air pipeline, when the temperature of the hot air pipeline is too high, the temperature in the hot air pipeline can be adjusted to prevent the filter bag inside the bag filter from being burned and the dust deposition in the hot air pipeline due to too low flow velocity.

[0012] Further, the heating device is a jacket layer sleeved on the dust removal branch pipe. A heat source pipe for supplying heat source to the jacket and a drainage pipe for discharging the heat source after heat exchange are installed on the jacket layer.

[0013] The structure of the above heating device is simple, easy to manufacture, and has low production cost.

[0014] Further, the outlet end of the heat source pipe is close to the mixing tee, and the inlet end of the drainage pipe is close to the flue gas collector hood.

[0015] With the above layout of the positions of the heat source pipe and the drainage pipe, for the flow direction of the dust removal branch pipe, the heating device constitutes a countercurrent heating device. In this way, the heating effect is more stable and obvious. During heating, the energy consumption is relatively low, and at the same time, the heat exchange is strengthened.

[0016] Further, a first regulating valve is installed on the cold air pipeline, a second regulating valve is installed on the heat source pipe, a third regulating valve is installed on the dust removal branch pipe between the heating device and the flue gas collector hood, and a fourth regulating valve is installed on the hot air pipeline between the cold air pipeline and the mixing tee;

[0017] A first thermometer is installed on the hot air pipeline between the inlet of the cold air pipeline and the hot air pipeline, a second thermometer is installed on the hot air pipeline between the mixing tee and the cold air pipeline and close to the cold air pipeline, a third thermometer for measuring the inner wall temperature of the dust removal branch pipe is installed on the dust removal branch pipe located in the heating device, a fourth thermometer is installed on the heat source pipe, and a fifth thermometer is installed on the dust removal pipeline.

[0018] Under the design of the above four regulating valves, it is convenient to adjust and control the corresponding pipelines. Under the design of the above five thermometers, it is convenient to monitor the temperature on the corresponding pipelines. During use, the opening degree of the corresponding valve can be directly adjusted according to the temperature detection value to keep the temperature above the dew point temperature. Generally speaking, it facilitates the operation of workers.

[0019] Furthermore, the first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve are signal valves that can transmit signals and automatically control the valve state.

[0020] The first thermometer, the second thermometer, the third thermometer, the fourth thermometer and the fifth thermometer are thermocouple thermometers.

[0021] The adoption of signal valves for the above four regulating valves and thermocouple thermometers for the five thermometers facilitates centralized observation and control.

[0022] Furthermore, it further includes a control unit, which is used to receive the temperature signals of all thermocouple thermometers and control the states of the corresponding signal valves according to the temperatures of the respective thermocouple thermometers.

[0023] Under the design of the above control unit, it lays a foundation for realizing the degree of automation. The control unit can select a control mode according to the requirements of the existing process to automatically execute relevant operations, saving time and effort.

[0024] Furthermore, the cold air pipeline is close to the air inlet end of the hot air pipeline.

[0025] Adopting the method that the cold air pipeline is close to the air inlet end of the hot air pipeline facilitates the temperature control of the hot air pipeline.

[0026] Furthermore, the water outlet end of the drainage pipeline is used to be connected and communicated with the sintering mixer.

[0027] Under the cooperative design of the drainage pipeline and the sintering mixer, the existing water resources are effectively utilized.

[0028] Furthermore, a hot air collecting hood for collecting the waste heat of the annular cooler and gathering it into the hot air pipeline is installed at the air inlet of the hot air pipeline.

[0029] Under the design of the hot air collecting hood, it is convenient to cooperate with the annular cooler in the existing sintering process and convenient to collect the waste heat on the annular cooler.

[0030] Compared with the prior art, the present utility model has the following beneficial effects:

[0031] 1. This design uses a heating device to heat the wall of the dust removal branch pipe, thereby preventing the production of condensed water on the inner wall and preventing pipeline blockage.

[0032] 2. The design also preferably makes the heat source flow direction in the heating device opposite to the air flow direction in the dust removal branch pipe to enhance heat exchange.

[0033] 3. With the coordinated design of the hot air pipe, cold air pipe and dust removal branch pipe, when the mixed flue gas enters the bag filter for treatment, it can effectively prevent the generation of condensate inside the bag filter and prevent the bag filter from being blocked. Especially with the coordinated design of the cold air pipe, it effectively prevents the heat source temperature in the hot air pipe from being higher than the design temperature, avoiding the burning of the filter bags of the bag filter due to high temperature and the dust deposition caused by too low hot air flow velocity.

[0034] 4. When the bag filter purifies the waste gas of the sintering mixer in this system, it can achieve continuous and stable discharge of up-to-standard dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, are used to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are included in this specification and form a part of this specification.

[0036] Figure 1 It is a schematic diagram of the basic structure of the utility model;

[0037] Figure 2 is Figure 1 a schematic diagram of the basic structure of the cooperation between the heating device and the dust removal branch pipe in

[0038] Figure 3 is Figure 2 a schematic diagram of the sectional structure of A-A in

[0039] Reference numerals: 1. Hot air intake point; 2. Hot air collecting hood; 3. Hot air pipe; 4. Cold air inlet; 5. First regulating valve; 6. Cold air pipe; 7. Sintering mixer; 8. Flue gas collecting hood; 9. Dust removal branch pipe; 10. Heat source inlet; 11. Second regulating valve; 12. Heat source pipe; 13. Drainage pipe; 14. Mixing tee; 15. Dust removal pipe; 16. Third regulating valve; 17. Bag filter; 18. First thermometer; 19. Second thermometer; 20. Third thermometer; 21. Fourth thermometer; 22. Heating device; 23. Fourth regulating valve; 24. Fifth thermometer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The following further details the present disclosure in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the relevant content and not for limiting the present disclosure. Additionally, it should be noted that for the sake of description, only parts related to the present disclosure are shown in the drawings.

[0041] It should be noted that, without conflict, the embodiments in the present disclosure and the features in the embodiments may be combined with each other. The present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0042] Embodiment

[0043] A sintering mixer anti-blocking dust removal system described in this embodiment is as follows Figure 1 As shown, it includes a bag filter 17. The inlet end of the bag filter 17 is connected to a dust removal pipeline 15 that is in communication with it. The inlet end of the dust removal pipeline 15 is sequentially connected to a hot air pipeline 3 and a dust removal branch pipe 9 through a mixing tee 14. The inlet end of the dust removal branch pipe 9 is equipped with a flue gas collecting hood 8 that collects the flue gas of the sintering mixer 7 into the dust removal branch pipe 9. A heating device 22 for heating the dust removal branch pipe 9 is provided on the dust removal branch pipe 9; a cold air pipeline 6 for supplying cold air to the hot air pipeline 3 is connected to the hot air pipeline 3. The cold air pipeline 6 is close to the inlet end of the hot air pipeline 3, and the inlet of the cold air pipeline 6 is a cold air inlet 4. During use, the existing cold source enters the cold air pipeline 6 from the cold air inlet 4.

[0044] The connection manner of the above mixing tee 14 with the hot air extraction point 1, the hot air pipeline 3, and the dust removal branch pipe 9 is an existing technology. In this technical solution, the mixing tee 14 has two inlets and one outlet. The outlet is connected and communicated with the dust removal pipeline 15, the first inlet is connected and communicated with the outlet of the hot air pipeline 3, and the second inlet is connected and communicated with the outlet of the dust removal branch pipe 9.

[0045] A hot air collecting hood 2 for collecting the waste heat of the ring cooler is installed at the inlet of the hot air pipeline 3. As Figure 1 shown, the inlet end of the hot air collecting hood 2 is the hot air extraction point 1, and the hot air extraction point 1 is set corresponding to the ring cooler waste heat dissipation point in the existing sintering process.

[0046] This embodiment will further illustrate the technology, as Figure 2 、 Figure 3As shown, the heating device 22 is a jacket layer sleeved on the dust removal branch pipe 9. A heat source pipe 12 for supplying heat source to the jacket and a drainage pipe 13 for discharging the heat source after heat exchange are installed on the jacket layer. The water outlet end of the drainage pipe 13 is used to be connected and communicated with the sintering mixer (in the prior art, the heat source is usually of two types, one is steam and the other is hot water. When it is steam, the condensate is discharged through the drainage pipe 13 during heat exchange; when it is hot water, the relatively low-temperature hot water is discharged through the drainage pipe 13 during heat exchange); the air inlet of the heat source pipe 12 is the heat source inlet 10. During use, the existing heat source enters the heat source pipe 12 from the heat source inlet 10. This design principle often appears in jacketed reactors. In this solution, that is, an outer pipe is sleeved on the dust removal branch pipe 9, and the dust removal branch pipe 9 is used as the inner pipe. The two ends of the outer pipe are hermetically connected to the outer side of the inner pipe. At this time, a cavity with a tubular structure is formed between the outer pipe and the inner pipe, and both the heat source pipe 12 and the drainage pipe 13 are connected and communicated with the cavity, and this cavity is used for the passage of the heat source.

[0047] This embodiment will further illustrate the technology. The heating device is a countercurrent heating device. As Figure 1 shown, the outlet end of the heat source pipe 12 is close to the mixing tee 14, and the inlet end of the drainage pipe 13 is close to the flue gas collecting hood 8. In actual application, the drainage pipe 13 can also be close to the mixing tee 14, and the inlet end of the heat source pipe 12 can be close to the flue gas collecting hood 8.

[0048] This embodiment will further illustrate the technology. A first regulating valve 5 is installed on the cold air pipe 6, a second regulating valve 11 is installed on the heat source pipe 12, a third regulating valve 16 is installed on the dust removal branch pipe 9 between the heating device 22 and the flue gas collecting hood 8, and a fourth regulating valve 23 is installed on the hot air pipe 3 between the cold air pipe 6 and the mixing tee 14;

[0049] A first thermometer 18 is installed on the hot air pipe 3 between the air inlet of the cold air pipe 6 and the hot air pipe 3, a second thermometer 19 is installed on the hot air pipe 3 between the mixing tee 14 and the cold air pipe 6 and close to the cold air pipe 6, a third thermometer 20 for measuring the inner wall temperature of the dust removal branch pipe 9 is installed on the dust removal branch pipe 9 located in the heating device 22, a fourth thermometer 21 is installed on the heat source pipe 12, and a fifth thermometer 24 is installed on the dust removal pipe 15. It should be noted in this paragraph that when the third thermometer 20 is installed, it measures the inner wall temperature of the dust removal branch pipe 9, while when the first thermometer 18, the second thermometer 19, the fourth thermometer 21, and the fifth thermometer 24 are installed, they measure the temperature in the corresponding pipe. For example, the first thermometer 18 measures the temperature in the hot air pipe 3.

[0050] In this embodiment, the first regulating valve 5, the second regulating valve 11, the third regulating valve 16, and the fourth regulating valve 23 are signal valves that can transmit signals and automatically control the valve states; the first thermometer 18, the second thermometer 19, the third thermometer 20, the fourth thermometer 21, and the fifth thermometer 24 are thermocouple thermometers. In practical applications, according to the on-site process conditions, in terms of the power for controlling the valve, it can be electric, hydraulic, pneumatic, or electro-hydraulic. In terms of the type of regulating valve, it can be a slide valve, a butterfly valve, a ball valve, a gate valve, etc.

[0051] This embodiment will further illustrate the technology. It also includes a control unit, which is used to receive the temperature signals of all thermocouple thermometers and control the states of the corresponding signal valves according to the temperatures of the thermocouple thermometers. For example, due to the different temperature values measured by different thermometers, when the control unit receives the signals, it will then control the corresponding regulating valves according to the temperature values. Such control technologies are everywhere in the chemical industry and the sintering industry, so they will not be elaborated here one by one.

[0052] In the description of this specification, the descriptions referring to terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0053] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] Those skilled in the art should understand that the above embodiments are only for clearly explaining the present disclosure and not for limiting the scope of the present disclosure. For those skilled in the art, other changes or modifications can be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A sintering mixer anti-blocking dust removal system, comprising a bag filter (17), the intake port end of the bag filter (17) is connected to a dust removal pipe (15) communicating therewith, the intake end of the dust removal pipe (15) is sequentially connected to a hot air pipe (3) and a dust removal branch pipe (9) through a mixing tee (14), and is characterized in that: The inlet end of the dust removal branch pipe (9) is equipped with a flue gas collecting hood (8) that collects the sintering mixer flue gas into the dust removal branch pipe (9), and a heating device (22) for heating the dust removal branch pipe (9) is provided on the dust removal branch pipe (9); a cold air pipe (6) for supplying cold air to the hot air pipe (3) is connected to the hot air pipe (3).

2. The anti-blocking dust removal system for the sintering mixer according to claim 1, wherein: The heating device (22) is a jacket layer sleeved on the dust removal branch pipe (9), and a heat source pipe (12) for providing a heat source to the jacket and a drain pipe (13) for discharging the heat source after heat exchange are installed on the jacket layer.

3. The sintering mixer anti-blocking dust removal system according to claim 2, characterized in that: The outlet end of the heat source pipe (12) is close to the mixing tee (14), and the inlet end of the drain pipe (13) is close to the flue gas collecting hood (8).

4. The anti-blocking dust removal system for a sintering mixer according to claim 2 or 3, characterized in that: A first regulating valve (5) is installed on the cold air pipe (6), a second regulating valve (11) is installed on the heat source pipe (12), a third regulating valve (16) is installed on the dust removal branch pipe (9) between the heating device (22) and the flue gas collecting hood (8), and a fourth regulating valve (23) is installed on the hot air pipe (3) between the cold air pipe (6) and the mixing tee (14); A first thermometer (18) is installed on the hot air pipe (3) between the inlet of the cold air pipe (6) and the inlet of the hot air pipe (3), a second thermometer (19) is installed on the hot air pipe (3) between the mixing tee (14) and the cold air pipe (6) and close to the cold air pipe (6), a third thermometer (20) for measuring the temperature of the inner pipe wall of the dust removal branch pipe (9) is installed on the dust removal branch pipe (9) located in the heating device (22), a fourth thermometer (21) is installed on the heat source pipe (12), and a fifth thermometer (24) is installed on the dust removal pipe (15).

5. The sintering mixer anti-blocking dust removal system according to claim 4, wherein: The first regulating valve (5), the second regulating valve (11), the third regulating valve (16) and the fourth regulating valve (23) are signal valves that can transmit signals and automatically control the valve state; The first thermometer (18), the second thermometer (19), the third thermometer (20), the fourth thermometer (21) and the fifth thermometer (24) are thermocouple thermometers.

6. The anti-blocking dust removal system for a sintering mixer according to claim 5, wherein: It also includes a control unit, which is used to receive the temperature signals of all thermocouple thermometers and control the states of the corresponding signal valves according to the temperatures of the thermocouple thermometers.

7. The anti-blocking dust removal system for the sintering mixer according to claim 1, wherein: The cold air pipe (6) is close to the inlet end of the hot air pipe (3).

8. The anti-blocking dust removal system for a sintering mixer according to claim 3, characterized in that: The outlet end of the drain pipe (13) is used to be connected and communicated with the sintering mixer.

9. The sintering mixer anti-blocking dust removal system according to claim 1, characterized in that: A hot air collecting hood (2) that collects the waste heat of the annular cooler into the hot air pipe (3) is installed at the inlet of the hot air pipe (3).

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