Powder spray gun for flue gas dry desulfurization and denitrification

Abstract

The utility model discloses a powder spray gun for flue gas dry desulfurization and denitrification, which comprises a spray gun, the spray gun comprises a spray gun protection sleeve for airflow to pass through and a spray gun body pipe which is positioned in the spray gun protection sleeve and is used for medicament to pass through, and a nozzle pipe A and a nozzle pipe C are arranged at an outlet of the spray gun protection sleeve. The nozzle pipe C and the nozzle pipe A are connected to form a channel which firstly shrinks and then expands, a nozzle pipe B with an expanded diameter is arranged at an outlet of the spray gun body pipe, an air acceleration channel is formed between the outer wall of the nozzle pipe B and the inner wall of the nozzle pipe C, and a flow guide cone extending into the nozzle pipe B is further arranged in the nozzle pipe A. According to the powder spray gun for flue gas dry desulfurization and denitrification, powder can be uniformly distributed and dispersed, the powder spraying coverage area can be enlarged, the powder spraying distance can be increased, and uniform mixing of the powder and flue gas can be achieved, so that the desulfurization and denitrification effect is improved, and meanwhile, the problem of blocking of thin pipes is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas purification technical field especially, relates to a kind of powder spray gun for flue gas dry desulfurization and denitrification. BACKGROUND

[0002] Dry desulfurization and denitrification integration technology as a kind of flue gas deep emission demand emergent new technology, dry polymer denitrification combined SNCR system, can the NO x Concentration is reduced to 100mg / Nm 3 Below;Furnace is sprayed into dry desulfurization reagent+rear half dry method deacidification, can the SO2 concentration be reduced to 20mg / Nm 3 Below, has been widely used in garbage incineration electricity, cement, papermaking etc.Industry.Dry desulfurization and denitrification integration technology has the advantages such as simple process, flexible space arrangement, less investment, no harmful by-product, and good desulfurization and denitrification effect.

[0003] Existing flue gas dry desulfurization reagent / denitrification reagent is mostly granular or powdery, adopts pneumatic conveying mode, disperses and sprays reagent into high-temperature furnace chamber of boiler, desulfurization and denitrification integrated spray gun in industry generally adopts DN32 below thin pipe to spray into furnace chamber, actual operation exists that spray gun is easy to block, reagent injection dispersion area is small and flue gas is not uniformly contacted, lead to desulfurization and denitrification reagent cannot evenly cover furnace chamber section, cause denitrification and desulfurization effect to be not ideal, and ammonia escape is high Pain point problem, affect system stable operation, further affect environmental protection monitoring index and increase enterprise operation cost. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem that it provides a kind of powder spray gun for flue gas dry desulfurization and denitrification, can evenly divide and disperse powder and expand powder injection coverage area, increase powder injection distance, reach the uniform mixing of powder and flue gas, to improve desulfurization and denitrification effect, and solve the problem of thin pipe blocking simultaneously.

[0005] The utility model solves the technical problem and adopts the technical scheme that a kind of powder spray gun for flue gas dry desulfurization and denitrification, including spray gun, the spray gun includes the spray gun protection sleeve pipe for airflow and the spray gun body pipe for reagent through located inside spray gun protection sleeve pipe, the outlet of spray gun protection sleeve pipe has first nozzle pipe and third nozzle pipe, the third nozzle pipe and first nozzle pipe are connected to form the channel of first shrinkage and then expansion, the outlet of spray gun body pipe has the second nozzle pipe of expansion, air acceleration channel is formed between the outer wall of second nozzle pipe and the inner wall of third nozzle pipe, first nozzle pipe is also equipped with the flow guide cone of second nozzle pipe insertion.

[0006] Further, in order to make the powder atomized into a cone form and sprayed into the furnace, the angle between the outer wall of the first nozzle pipe, the second nozzle pipe and the guide cone and the axis direction is the same.

[0007] Further, in order to accelerate the air flow through the lance protection sleeve, the inclination between the second nozzle pipe and the third nozzle pipe is symmetrical.

[0008] Further, the cone angle of the lower end of the guide cone is 10-65°.

[0009] Further, in order to fix the guide cone and ensure the atomization effect of the powder, the lower part of the guide cone is flush with the lower end surface of the second nozzle pipe B, and the guide cone is connected to the first nozzle pipe through a fixing rib plate.

[0010] Further, in order to ensure the formation of the air acceleration channel, the upper end surfaces of the third nozzle pipe and the second nozzle pipe are flush.

[0011] Further, in order to perform primary blowing on the powder, a first blowing gas interface is arranged at the inlet of the lance protection sleeve, the first blowing gas interface is connected with the lance body pipe, and the gas in the first blowing gas interface flows to the second nozzle pipe.

[0012] Further, a second blowing gas interface is arranged at the inlet of the lance protection sleeve, and the gas in the second blowing gas interface directly flows to the third nozzle pipe.

[0013] Further, in order to blow the powder and avoid the blockage of the lance, the lower end of the lance body pipe has an elbow pipe, the lower end of the elbow pipe has a medicament interface pipe, the first blowing gas interface is connected to the elbow pipe, and the inlet of the medicament interface pipe extends out of the lance protection sleeve.

[0014] Further, in order to facilitate the fixation and installation of the lance protection sleeve, a sleeve fixing device is sleeved on the upper part of the lance protection sleeve, the installation flange of the lance protection sleeve is connected with the installation base flange of the sleeve fixing device, and the lower end of the lance protection sleeve is further provided with a tail sealing cover.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] The powder lance for flue gas dry desulfurization and denitrification of the present application can atomize the powder sprayed from the third nozzle pipe into a cone shape, thereby expanding the powder spraying coverage area, and the lance protection sleeve forms a Venturi acceleration channel through the second nozzle pipe and the third nozzle pipe, the gas passes through the acceleration channel to increase the flow rate, thereby effectively increasing the spraying distance.

[0017] The utility model is used for powder spray gun of flue gas dry desulfurization and denitrification, the second auxiliary blowing gas interface of intercommunication spray gun body pipe is arranged in spray gun protection sleeve, and the first stage auxiliary blowing of powder is carried out, or the auxiliary blowing when spray gun is blocked, can solve the problem of spray gun blockage. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model is further described below in combination with the drawings and examples.

[0019] Figure 1 It is structure schematic drawing of powder spray gun of flue gas dry desulfurization and denitrification of the utility model;

[0020] Figure 2 It is connection structure schematic drawing of spray gun protection sleeve and spray gun body pipe;

[0021] Figure 3 It is Figure 1 Top view;

[0022] In the drawing: 1, spray gun protection sleeve, 11, installation flange, 12, first auxiliary blowing gas interface, 13, second auxiliary blowing gas interface, 14, tail sealing cover, 15, flow cone, 16, fixed rib plate, 2, spray gun body pipe, 21, elbow pipe, 22, medicament interface pipe, 3, sleeve fixing device, 31, installation base flange, first nozzle pipe A, second nozzle pipe B, third nozzle pipe C. DETAILED DESCRIPTION

[0023] The utility model will be further described in combination with the drawings. These drawings are all simplified schematic diagrams, and only the basic structure of the utility model is schematically shown, so it only shows the structure related to the utility model.

[0024] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. The features defined as "first" and "second" can be explicitly or implicitly included one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0025] In the description of the utility model, need explanation, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through intermediate medium indirectly connected, can be two element internal communication.For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0026] As Figure 1 Indicated, a kind of powder spray gun for flue gas dry desulfurization and denitrification, including spray gun, spray gun includes the spray gun protection sleeve 1 for airflow passage and the spray gun body pipe 2 for medicament passage located in spray gun protection sleeve 1 inside.The upper portion of spray gun protection sleeve 1 is sleeved with sleeve fixing device 3, the mounting flange 11 of spray gun protection sleeve 1 is connected with the mounting base flange 31 of sleeve fixing device 3, the lower end of spray gun protection sleeve 1 is also provided with tail sealing cover 14.

[0027] As Figure 2 And Figure 3 Indicated, the lower end of spray gun body pipe 2 has elbow pipe 21, the lower end of elbow pipe 21 has medicament interface pipe 22.The inlet of spray gun protection sleeve 1 is equipped with first auxiliary blowing gas interface 12, and first auxiliary blowing gas interface 12 is connected with spray gun body pipe 2.First auxiliary blowing gas interface 12 is connected into elbow pipe 21, and the inlet of medicament interface pipe 22 extends from spray gun protection sleeve 1.Powder enters spray gun body pipe 2 from medicament interface pipe 22 along elbow pipe 21, and finally is sprayed from second nozzle pipe B.Gas in first auxiliary blowing gas interface 12 enters from elbow pipe 21, and then flows to second nozzle pipe B by spray gun body pipe 2, and the gas is blown to powder in the process of flowing, and this airflow is primary auxiliary blowing airflow of powder, and primary auxiliary blowing airflow not only can improve powder flow rate, but also can prevent powder from blocking spray gun.

[0028] The outlet of the lance protection sleeve 1 has a first nozzle pipe A and a third nozzle pipe C, the third nozzle pipe C and the first nozzle pipe A are connected to form a channel with first contraction and then expansion. The angle between the outer wall of the first nozzle pipe A, the second nozzle pipe B and the flow cone 15 and the axis direction is the same. The upper end faces of the third nozzle pipe C and the second nozzle pipe B are flush. The outlet of the lance body pipe 2 has an expanded-diameter second nozzle pipe B, the inclination between the second nozzle pipe B and the third nozzle pipe C is symmetrical, and the air acceleration channel is formed between the outer wall of the second nozzle pipe B and the inner wall of the third nozzle pipe C. The inlet of the lance protection sleeve 1 is provided with a second auxiliary blowing gas interface 13, and the gas in the second auxiliary blowing gas interface 13 directly flows to the third nozzle pipe C. The gas in the second auxiliary blowing gas interface 13 moves upward along the lance protection sleeve 1, and the annular air acceleration channel is formed between the outer wall of the second nozzle pipe B and the inner wall of the third nozzle pipe C. The gas is accelerated through the acceleration channel and then sprayed from the first nozzle pipe A, which is the secondary auxiliary blowing gas flow of the powder, effectively increasing the spraying distance of the powder.

[0029] The first nozzle pipe A is also provided with a flow cone 15 extending into the second nozzle pipe B, and the flow cone 15 is connected to the first nozzle pipe A by a fixed rib plate 16. The taper angle of the lower end of the flow cone 15 is 10-65°. The lower part of the flow cone 15 is flush with the lower end face of the second nozzle pipe B. Under the guidance of the conical surface of the flow cone 15, the powder discharged from the second nozzle pipe B is atomized into a conical form and sprayed into the furnace, and the primary and secondary auxiliary blowing gas flows blow the powder in turn, effectively increasing the powder flow rate, expanding the powder spraying coverage area, increasing the spraying distance, achieving uniform mixing of the powder and flue gas, thereby improving the desulfurization and denitrification effect, and also solving the problem of fine tube blockage.

[0030] The materials of the flow cone 15, the first nozzle pipe A and the third nozzle pipe C are 310SS and above, and the materials of the lance body pipe 2 and the lance protection sleeve 1 are 316L and above. The contact surfaces of the above-mentioned components with the powder can also be covered with a wear-resistant coating. The material of the second nozzle pipe B can be high-manganese carbon steel, 304, 316L, etc., and the interface can be designed in the form of threads, quick connectors, flanges, etc.

[0031] The utility model is used for powder spray gun of flue gas dry desulfurization and denitrification, and the specific working principle is as follows: the first auxiliary blowing gas interface 12 and the second auxiliary blowing gas interface 13 are passed through, the gas of the first auxiliary blowing gas interface 12 enters the elbow pipe 21, the powder of the spray gun body pipe 2 is blown out from the second nozzle pipe B, the powder is atomized and dispersed under the influence of the flow guide cone 15 to form a conical spray area and is sprayed from the first nozzle pipe A, at the same time, the gas of the second auxiliary blowing gas interface 13 flows along the spray gun protection sleeve pipe 1, enters the first nozzle pipe A after passing through the annular acceleration channel between the second nozzle pipe B and the third nozzle pipe C, further provides power for the powder, so that the powder has greater spray area and spray distance.

[0032] In conclusion, the utility model is used for powder spray gun of flue gas dry desulfurization and denitrification, the unique structure that the flow guide cone is combined with the different diameter and the auxiliary blowing pipe organically can uniformly disperse and expand the powder spray coverage area, increases the powder spray distance, solves the pain point problem that the existing spray gun is blocked, the medicine injection dispersion area is small and the flue gas is not uniform, and the ammonia escape is high, can guarantee the normal and stable operation of the dry desulfurization and denitrification system, strongly guarantees the environmental protection index of factory production normal, also provides the technical guarantee that the dry desulfurization and denitrification integration technology gradually matures, can be applied to garbage incineration power plant, cement plant, paper mill and other industry flue gas purification, is suitable for boiler high temperature area flue gas desulfurization and denitrification nozzle device, also can be suitable for the low temperature (140 DEG C-220 DEG C) dry desulfurization nozzle of boiler economizer outlet.

[0033] The above-mentioned ideal embodiment of the utility model is as an inspiration, and through the above-mentioned description, relevant staff can make various changes and modifications without deviating from the technical idea of the utility model.The technical scope of the utility model is not limited to the content in the specification, and must be determined by the scope of claims.

Claims

1. A powder spray gun for dry flue gas desulfurization and denitrification, comprising a spray gun, said spray gun including a spray gun protective sleeve (1) for airflow passage and a spray gun body tube located inside the spray gun protective sleeve (1) for reagent passage, characterized in that, The outlet of the spray gun protective sleeve (1) has a first nozzle tube (A) and a third nozzle tube (C). The third nozzle tube (C) and the first nozzle tube (A) are connected to form a channel that first narrows and then expands. The outlet of the spray gun body tube (2) has a second nozzle tube (B) with an expanded diameter. An air acceleration channel is formed between the outer wall of the second nozzle tube (B) and the inner wall of the third nozzle tube (C). The first nozzle tube (A) is also provided with a guide cone (15) that extends into the second nozzle tube (B).

2. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 1, characterized in that, The outer walls of the first nozzle tube (A), the second nozzle tube (B), and the guide cone (15) have the same angle with the axial direction.

3. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 2, characterized in that, The inclinations between the second nozzle tube (B) and the third nozzle tube (C) are symmetrical.

4. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 3, characterized in that, The cone angle at the lower end of the guide cone (15) is 10-65°.

5. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 1, characterized in that, The lower part of the guide cone (15) is flush with the lower end face of the second nozzle tube (B), and the guide cone (15) is connected to the first nozzle tube (A) by a fixing rib plate (16).

6. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 1, characterized in that, The upper surfaces of the third nozzle tube (C) and the second nozzle tube (B) are flush.

7. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 1, characterized in that, The inlet of the spray gun protective sleeve (1) is provided with a first blowing gas interface (12), which is connected to the spray gun body tube (2), and the gas in the first blowing gas interface (12) flows to the second nozzle tube (B).

8. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 7, characterized in that, The inlet of the spray gun protective sleeve (1) is provided with a second blowing gas interface (13), and the gas in the second blowing gas interface (13) flows directly to the third nozzle tube (C).

9. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 8, characterized in that, The lower end of the spray gun body tube (2) has an elbow tube (21), and the lower end of the elbow tube (21) has a drug interface tube (22). The first blowing gas interface (12) is connected to the elbow tube (21), and the inlet of the drug interface tube (22) extends out of the spray gun protective sleeve (1).

10. The powder spray gun for dry flue gas desulfurization and denitrification according to claim 1, characterized in that, The spray gun protective sleeve (1) is fitted with a sleeve fixing device (3) on its upper part. The mounting flange (11) of the spray gun protective sleeve (1) is connected to the mounting base flange (31) of the sleeve fixing device (3). The lower end of the spray gun protective sleeve (1) is also provided with a tail sealing cap (14).

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