Nozzle device

Abstract

The utility model relates to the technical field of flue gas treatment, in particular to a nozzle device which comprises a first nozzle used for spraying desulfurized ultrafine powder and a second nozzle used for spraying flue gas, the second nozzle is sleeved outside the first nozzle, a spraying opening of the first nozzle is located in the second nozzle, and the flow velocity of the flue gas is higher than that of the desulfurized ultrafine powder. The desulfurized ultrafine powder can be mixed with the flue gas in the second nozzle after being sprayed out from the spraying opening of the first nozzle, and is sprayed out from the spraying opening of the second nozzle. As the flow velocity of the flue gas is higher than that of the desulfurized ultrafine powder, the desulfurized ultrafine powder is firstly mixed with the flue gas in the second nozzle after being sprayed out from the spraying opening of the first nozzle to form flue gas wrapped powder-containing airflow, on one hand, the flow velocity of the mixed airflow can be increased, the spraying distance of the desulfurized ultrafine powder in the flue can be increased, and the mixing and contact effects are improved; on the other hand, flue gas is introduced in advance, so that the effect of activating the desulfurization superfine powder in advance is achieved, and the utilization rate and desulfurization performance of the desulfurization superfine powder can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a nozzle device. Background Art

[0002] The SDS dry deacidification process has simple equipment and high pollution removal rate, and has been widely used in the field of flue gas treatment in steel enterprises. The deacidification principle is to spray desulfurization ultrafine powder (such as baking soda) into the flue gas, which quickly decomposes and expands in the high-temperature flue gas to form particles with high specific surface area and high activation performance, which can react quickly with the acidic components (sulfur dioxide, etc.) in the flue gas. The reaction products are captured and removed in the subsequent dust removal equipment (such as bag filter), thereby achieving the purpose of flue gas purification.

[0003] The rapid diffusion of desulfurization ultrafine powder in the flue and its full contact with high-temperature flue gas are the key points to ensure the deacidification efficiency. At present, SDS dry deacidification powder spraying mostly adopts direct blowing nozzles. The spraying speed of desulfurization ultrafine powder in the flue gas is limited, and the mixing effect mainly depends on its free diffusion in the flue. Utility Model Content

[0004] The utility model aims to provide a nozzle device to solve the problem that the injection speed in the flue gas is limited when the desulfurization ultrafine powder is injected by a direct blowing nozzle in the existing SDS dry deacidification process, resulting in poor mixing effect.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a nozzle device, comprising a first nozzle for spraying desulfurization ultrafine powder and a second nozzle for spraying flue gas, the second nozzle is arranged outside the first nozzle, and the injection port of the first nozzle is located in the second nozzle, the flow rate of the flue gas is higher than the flow rate of the desulfurization ultrafine powder, and the desulfurization ultrafine powder can be mixed with the flue gas in the second nozzle after being sprayed out from the injection port of the first nozzle, and sprayed out from the injection port of the second nozzle.

[0006] Optionally, the second nozzle includes an entry section and a mixing section connected in sequence, the entry section is provided with an inlet for the smoke, the mixing section is provided with an injection port of the second nozzle, and the first nozzle is located in the mixing section.

[0007] Optionally, a plurality of swirl guide vanes are provided between the entry section and the mixing section.

[0008] Optionally, the swirl guide vane is located in the second nozzle and is arranged around the outside of the first nozzle.

[0009] Optionally, the swirl guide vane is fixed between the outer side wall of the first nozzle and the inner side wall of the second nozzle.

[0010] Optionally, the swirl guide vane is arranged on the outside of the first nozzle via a rotating shaft, and the rotating shaft is rotatably sleeved outside the first nozzle.

[0011] Optionally, the inner cavity size of the entry section is larger than the inner cavity size of the mixing section.

[0012] Optionally, the mixing section is made of hardened metal material.

[0013] Optionally, the first nozzle is flange-connected to the second nozzle.

[0014] Optionally, the flue gas is introduced into the second nozzle through a fan.

[0015] The nozzle device provided by the utility model has at least one of the following beneficial effects:

[0016] 1) Since the flow rate of the flue gas is higher than the flow rate of the desulfurized ultrafine powder, when the desulfurized ultrafine powder is sprayed out from the nozzle of the first nozzle, it is first mixed with the flue gas in the second nozzle to form a flue gas-wrapped powder-containing airflow and sprayed out from the nozzle of the second nozzle. On the one hand, the flow rate of the mixed airflow can be increased, and the spraying distance of the desulfurized ultrafine powder in the flue can be increased, thereby improving the mixing and contact effect of the desulfurized ultrafine powder in the flue; on the other hand, by introducing the flue gas in advance, the desulfurized ultrafine powder can be activated in advance, which can improve the utilization rate and desulfurization performance of the desulfurized ultrafine powder;

[0017] 2) By adding swirl guide vanes in the second nozzle, on the one hand, the flue gas can be guided, and on the other hand, the flue gas flow rate can be increased to produce a suction effect on the desulfurization ultrafine powder, thereby improving the penetration and flow rate of the desulfurization ultrafine powder in the flue gas, increasing the mixing with the original flue gas during the spraying into the flue, and improving the diffusion effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Those skilled in the art should understand that the drawings provided are for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0019] Figure 1 A schematic diagram of the structure of a nozzle device provided in one embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the arrangement of a nozzle device provided in one embodiment of the utility model.

[0021] in:

[0022] 1-nozzle device; 2-smoke duct; 3-fan;

[0023] 10 - first nozzle; 11 - injection port of the first nozzle; 20 - second nozzle; 21 - injection port of the second nozzle; 22 - entrance section; 23 - mixing section; 30 - swirl guide vane; 41 - first flange; 42 - second flange. DETAILED DESCRIPTION

[0024] In order to make the purpose, advantages and features of the present utility model clearer, the present utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the present utility model. In order to make the purpose, features and advantages of the present utility model more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present utility model. Any modification of the structure, change in the proportional relationship or adjustment of the size, in the case of the same or similar effects and purposes that can be achieved by the present utility model, should still fall within the scope of the technical content disclosed by the present utility model.

[0025] As used in the present invention, the singular forms "one", "an", and "the" include plural objects, unless the content clearly indicates otherwise. As used in the present invention, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise. As used in the present invention, the term "several" is generally used in a sense that includes "at least one", unless the content clearly indicates otherwise. As used in the present invention, the term "at least two" is generally used in a sense that includes "two or more", unless the content clearly indicates otherwise. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be a connection between two elements or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Please refer to Figure 1 and Figure 2 This embodiment provides a nozzle device 1, including a first nozzle 10 for spraying desulfurization ultrafine powder and a second nozzle 20 for spraying flue gas, the second nozzle 20 is arranged outside the first nozzle 10, and the injection port 11 of the first nozzle 10 is located in the second nozzle 20, the flow rate of the flue gas is higher than the flow rate of the desulfurization ultrafine powder, and the desulfurization ultrafine powder can be mixed with the flue gas in the second nozzle 20 after being sprayed from the injection port 11 of the first nozzle 10, and sprayed from the injection port 21 of the second nozzle 20.

[0028] The working principle of the nozzle device 1 provided in this embodiment is as follows:

[0029] Since the flow rate of the flue gas is higher than the flow rate of the desulfurization ultrafine powder, when the desulfurization ultrafine powder is ejected from the injection port 11 of the first nozzle 10, it is first mixed with the flue gas in the second nozzle 20 to form a flue gas-wrapped powder-containing airflow and ejected from the injection port 21 of the second nozzle 20. On the one hand, the flow rate of the mixed airflow can be increased, and the injection distance of the desulfurization ultrafine powder in the flue 2 can be increased, thereby improving the mixing and contact effect of the desulfurization ultrafine powder in the flue 2; on the other hand, by introducing the flue gas in advance, the desulfurization ultrafine powder can be activated in advance, which can improve the utilization rate and desulfurization performance of the desulfurization ultrafine powder.

[0030] It should be noted that the early activation mentioned in the present invention means that the desulfurization ultrafine powder should be activated in advance when the temperature of the flue gas to be treated is relatively low (such as below 140 degrees Celsius). At this time, the flue gas used for mixing (i.e. the flue gas in the second nozzle 20) can be heated (a heater can be added as needed) so that the temperature of the flue gas used for mixing is not lower than 160 degrees Celsius, thereby achieving the effect of activating the desulfurization ultrafine powder in advance.

[0031] In this embodiment, the first nozzle 10 is in a straight tube shape, and one end of the first nozzle 10 provided with an injection port is located in the second nozzle 20. The second nozzle 20 includes an inlet section 22 and a mixing section 23 connected in sequence, the inlet section 22 is provided with an inlet for the smoke, the mixing section 23 is provided with an injection port 21 of the second nozzle 20, and the first nozzle 10 is located in the mixing section 23.

[0032] Preferably, a plurality of swirl guide vanes 30 are provided between the entry section 22 and the mixing section 23. By adding the swirl guide vanes 30 in the second nozzle 20, the flue gas can be guided on the one hand, and the flue gas flow rate can be increased on the other hand to produce a suction effect on the desulfurization ultrafine powder, thereby improving the penetration and flow rate of the desulfurization ultrafine powder in the flue gas, increasing the mixing with the original flue gas during the injection into the flue 2, and improving the diffusion effect. This embodiment does not limit the number of the swirl guide vanes 30, and can be selected according to needs.

[0033] Furthermore, the swirl guide vane 30 is located in the second nozzle 20 and is arranged around the outside of the first nozzle 10. For example, 3 to 5 swirl guide vanes 30 can be provided according to needs and are evenly arranged along the circumference of the first nozzle 10.

[0034] As a preferred example in this embodiment, the swirl guide vane 30 is fixed between the outer wall of the first nozzle 10 and the inner wall of the second nozzle 20. That is, the swirl guide vane 30 can be fixedly installed, such as being fixed by welding to the outer wall of the first nozzle 10 and the inner wall of the second nozzle 20.

[0035] As another preferred example in this embodiment, the swirl guide vane 30 is arranged on the outside of the first nozzle 10 through a rotating shaft, and the rotating shaft is rotatably sleeved outside the first nozzle 10. In other words, the swirl guide vane 30 is rotatably designed, thereby further improving the entrainment effect of the flue gas, so as to further improve the penetration and flow rate of the desulfurization ultrafine powder in the flue 2.

[0036] It should be understood that the installation methods of the two swirl guide vanes 30 mentioned in this embodiment can be selected according to actual needs. For example, when the assembly space between the first nozzle 10 and the second nozzle 20 is small, a fixed installation method can be selected. When the assembly space between the first nozzle 10 and the second nozzle 20 is large, a rotatable installation method can be selected.

[0037] Preferably, the inner cavity size of the inlet section 22 is larger than the inner cavity size of the mixing section 23. By designing the inner cavity size of the inlet section 22 to be larger than the inner cavity size of the mixing section 23, the flow velocity of the flue gas after passing through the swirl guide vane 30 is further increased.

[0038] In this embodiment, since the flue gas and the desulfurization ultrafine powder will be mixed in the mixing section 23 to form a mixed airflow, the mixing section 23 can be made of hardened metal material alone, such as chrome-plated stainless steel, to improve the wear resistance of the mixing section 23.

[0039] In this embodiment, the first nozzle 10 is flange-connected to the second nozzle 20. Specifically, a first flange 41 may be provided at the end of the first nozzle 10, and a second flange 42 may be provided at the end of the second nozzle 20, and then the first flange 41 and the second flange 42 may be connected by fasteners such as bolts. The flange connection facilitates the disassembly of the first nozzle 10 and the second nozzle 20 for replacement, cleaning or maintenance.

[0040] In this embodiment, Figure 2 As shown, the desulfurized ultrafine powder can come from the front-end grinding system or the powder delivery system, and the flue gas can be taken from the upstream flue 2 of the desulfurized ultrafine powder injection point. The flue gas temperature is not lower than 140°C and can be introduced into the second nozzle 20 after being pressurized by the fan 3.

[0041] In summary, the embodiment of the utility model provides a nozzle device 1. Since the flow rate of the flue gas is higher than the flow rate of the desulfurization ultrafine powder, when the desulfurization ultrafine powder is ejected from the injection port 11 of the first nozzle 10, it is first mixed with the flue gas in the second nozzle 20 to form a flue gas-wrapped powder-containing airflow and ejected from the injection port 21 of the second nozzle 20. On the one hand, the flow rate of the mixed airflow can be increased, and the injection distance of the desulfurization ultrafine powder in the flue 2 can be increased, thereby improving the mixing and contact effect of the desulfurization ultrafine powder in the flue 2; on the other hand, by introducing the flue gas in advance, the desulfurization ultrafine powder can be activated in advance, which can improve the utilization rate and desulfurization performance of the desulfurization ultrafine powder.

[0042] In addition, it should be recognized that although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the above disclosed technical content can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A nozzle device, characterized in that: It comprises a first nozzle for spraying desulfurization ultrafine powder and a second nozzle for spraying flue gas, wherein the second nozzle is sleeved outside the first nozzle, and the spray port of the first nozzle is located inside the second nozzle, the flow rate of the flue gas is higher than the flow rate of the desulfurization ultrafine powder, and the desulfurization ultrafine powder can be mixed with the flue gas in the second nozzle after being sprayed out from the spray port of the first nozzle, and sprayed out from the spray port of the second nozzle.

2. The nozzle device according to claim 1, characterized in that The second nozzle includes an entry section and a mixing section connected in sequence, the entry section is provided with an inlet for the smoke, the mixing section is provided with an injection port of the second nozzle, and the first nozzle is located in the mixing section.

3. The nozzle device according to claim 2, characterized in that A plurality of swirl guide vanes are arranged between the inlet section and the mixing section.

4. The nozzle device according to claim 3, characterized in that The swirl guide vane is located in the second nozzle and is arranged around the outer side of the first nozzle.

5. The nozzle device according to claim 4, characterized in that The swirl guide vane is fixed between the outer side wall of the first nozzle and the inner side wall of the second nozzle.

6. The nozzle device according to claim 4, characterized in that The swirl guide vane is arranged on the outer side of the first nozzle via a rotating shaft, and the rotating shaft is rotatably sleeved outside the first nozzle.

7. The nozzle device according to claim 2, characterized in that The inner cavity size of the entry section is larger than the inner cavity size of the mixing section.

8. The nozzle device according to claim 2, characterized in that The mixing section is made of hardened metal.

9. The nozzle device according to claim 1, characterized in that The first nozzle is flange-connected to the second nozzle.

10. The nozzle device according to claim 1, characterized in that The flue gas is introduced into the second nozzle through a fan.

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