Mixing nozzle of fuming furnace

Abstract

The invention relates to a fuming furnace mixing nozzle, and belongs to the technical field of fuming furnace nozzles, the fuming furnace mixing nozzle comprises a spray pipe, a mixing pipe, a primary coal loading air pipe, a secondary air pipe, a first porcelain bushing, a second porcelain bushing and a plugging piece, the air inlet ends and the air outlet ends of the spray pipe, the mixing pipe, the primary coal loading air pipe and the secondary air pipe are sequentially connected and communicated through flange plates; a primary coal loading air hole is formed in the pipe wall of the primary coal loading air pipe, a primary coal loading air inlet pipe is fixed and communicated to the primary coal loading air hole, a secondary air hole is formed in the pipe wall of the secondary air pipe, and a secondary air inlet pipe is fixed and communicated to the secondary air hole; the first porcelain bushing is fixed in the spray pipe in a penetrating manner; the second magnetic sleeve is fixed in the mixing pipe in a penetrating manner; the plugging piece is detachably connected to the pipe opening end of the secondary air pipe. The first porcelain bushing and the second porcelain bushing are respectively fixed in the spray pipe and the mixing pipe in a penetrating manner, so that internal pulverized coal can be prevented from directly impacting the mixing pipe and the spray pipe, the high-temperature resistance and wear resistance of the mixing spray pipe are improved, and the service life of the mixing spray pipe is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of fuming furnace nozzles, and in particular to a fuming furnace mixing nozzle. Background Art

[0002] The melting temperature of the sulfide volatilization in the fuming furnace is 1150-1280℃. The temperature control and atmosphere adjustment of the furnace are all achieved by controlling the air-coal ratio. Since the temperature and atmosphere of the furnace are all provided by pulverized coal, the consumption of pulverized coal is relatively large. The fuel consumption of the furnace is 20-22%, and the daily consumption of pulverized coal is more than 50 tons. The fine pulverized coal is sprayed into the furnace body through the spray gun under the action of primary and secondary air to provide heat for the furnace. An eight-square fuming furnace has 24 air nozzles. In actual production, a large amount of fine pulverized coal, especially the coal gangue, is ground like a high-speed rotating grinder under the action of wind, causing the spray gun, inner cone sleeve and mixing chamber of the mixer to be seriously worn, reducing the service life of the mixer. The service life of a mixer made of ordinary steel parts is about one month.

[0003] Therefore, how to design a fumigation furnace mixing nozzle that is low in cost, resistant to high temperatures, resistant to wear, easy to clean, and easy to replace and maintain is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The invention provides a mixing nozzle for a fuming furnace, which solves the technical problem that the existing fuming furnace has a short service life.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a mixing nozzle of a fuming furnace, comprising: a nozzle, a mixing tube, a primary coal-carrying air duct, a secondary air duct, a first porcelain sleeve, a second porcelain sleeve and a plugging member,

[0006] The air inlet and air outlet ends of the nozzle, the mixing tube, the primary coal-carrying air duct and the secondary air duct are connected in series and communicated in series in sequence through flanges. The air outlet end of the nozzle is communicated with the air inlet of the fuming furnace. A primary coal-carrying air hole is provided on the pipe wall of the primary coal-carrying air duct, and a primary coal-carrying air inlet pipe is fixed on and communicated with the primary coal-carrying air hole. A secondary air hole is provided on the pipe wall of the secondary air duct, and a secondary air inlet pipe is fixed on and communicated with the secondary air hole. The first porcelain sleeve is fixed in the nozzle; the second magnetic sleeve is fixed in the mixing tube; the blocking piece is detachably connected to the pipe mouth end of the secondary air duct away from the primary coal-carrying air duct.

[0007] The beneficial effects of the present invention are:

[0008] 1. Improve the structure of the traditional mixing nozzle. Use the first porcelain sleeve and the second porcelain sleeve to penetrate and fix in the nozzle and the mixing tube respectively, so as to avoid the internal pulverized coal directly impacting the mixing tube and the nozzle, improve the high temperature resistance and wear resistance of the mixing nozzle, and extend its service life.

[0009] 2. By using flanges to connect the nozzles, mixing pipes, primary coal-carrying air ducts and secondary air ducts in series, the various components can be connected in sections, and damaged parts can be replaced quickly and conveniently, shortening maintenance hours and reducing maintenance costs. At the same time, the inside of the mixing nozzle can also be comprehensively and quickly inspected, thereby assisting in analyzing and judging the furnace condition.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the nozzle includes a heated pipe section and a plug-in pipe section which are arranged from away from the mixing tube to close to the mixing tube and are integrally connected, the plug-in pipe section is plugged into the air inlet hole of the fuming furnace, and the heated pipe section extends into the furnace of the fuming furnace; the air outlet end of the mixing tube is fixed by a flange and connected to the air inlet end of the plug-in pipe section; the first porcelain sleeve is inserted into the plug-in pipe section.

[0012] Furthermore, the axes of the heated pipe section and the plug-in pipe section are arranged at an angle α to the vertical line of the fuming furnace, and the angle α is 80° to 100°.

[0013] The further beneficial effect of adopting the above method is that by controlling the size of the angle α, the angle of the air-coal mixed airflow entering the fuming furnace can be changed, the pulverized coal combustion heat generation area in the furnace can be adjusted to the best position, and the combustion heat utilization rate can be improved.

[0014] Furthermore, the length of the heated pipe section is 10 to 100 mm.

[0015] The further beneficial effect of adopting the above method is that by reasonably controlling the length of the heated pipe section, the loss of the nozzle and the furnace wall water jacket caused by the local high temperature formed by the air flow scouring and the nozzle combustion heat release can be reduced, thereby extending the service life.

[0016] Furthermore, the length of the plug-in pipe section extending into the fuming furnace is L1, and L1 is 5 to 50 mm.

[0017] Furthermore, the heated pipe section is made of 304 stainless steel, and the plug-in pipe section is made of cast steel.

[0018] Furthermore, the mixing tube and the second porcelain sleeve are both variable diameter structures and their diameters increase in sequence from close to the nozzle to away from the nozzle.

[0019] The above method has the further beneficial effect that the flow velocity of the coal-carrying air in the mixing tube can be increased by using the mixing tube and the second porcelain sleeve as variable diameter structures whose diameters increase successively from close to the nozzle to away from the nozzle.

[0020] Furthermore, the primary coal-carrying air duct is a variable diameter structure and its diameter decreases gradually from close to the nozzle to away from the nozzle.

[0021] A further beneficial effect of adopting the above method is: utilizing the primary coal-carrying air duct as a variable diameter structure and having its diameter gradually decrease from close to the nozzle to away from the nozzle, the flow rate of the coal-carrying air in the primary coal-carrying air duct can be gradually reduced, reducing the impact of the coal-carrying air on the second porcelain sleeve, and the pulverized coal and the secondary air flow can be fully mixed.

[0022] Furthermore, the intersection of the axis of the primary coal-loaded air inlet duct and the axis of the primary coal-loaded air duct is point A, and the angle between the axis of the primary coal-loaded air inlet duct and the axis of the primary coal-loaded air duct is β; the intersection of the axis of the secondary air inlet duct and the axis of the secondary air duct is point B, and the angle between the axis of the secondary air inlet duct and the axis of the secondary air duct is γ; the intersection of the nozzle axis and the furnace wall of the fuming furnace is point C; the distance between point A and point B is L2, and the length of L2 is 150 to 200 mm; the distance between point B and point C is L3, and the length of L3 is 1000 to 1100 mm; the angle β is 30 to 35°, and the angle γ is 30 to 35°.

[0023] The further beneficial effects of adopting the above are: reasonable control of the sizes of β and γ can reduce the pressure loss during gas transmission; reasonable control of the sizes of L1 and L2 can improve the rationality of the layout of the gas transmission pipe connected to the air inlet and reduce the phenomenon of coal return when checking the furnace condition.

[0024] Furthermore, the sealing member includes a steel ball and a hollow bolt; a thread is provided on the outer tube wall of the pipe mouth end of the secondary air duct away from the primary coal-carrying air duct; the hollow bolt is threadedly connected to the thread of the secondary air duct; the steel ball rolls in the secondary air duct and can be in sealing contact with the inner hole of the hollow bolt.

[0025] The further beneficial effect of adopting the above method is that the sealing contact between the steel ball and the inner hole of the hollow bolt can close the pipe mouth end of the secondary air duct away from the primary coal-carrying air duct; at the same time, the inner hole of the hollow bolt can facilitate the inspection of furnace conditions and sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural schematic diagram of a mixing nozzle of a fuming furnace of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of a mixing nozzle of a fuming furnace of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of a first porcelain sleeve in a mixing nozzle of a fuming furnace according to the present invention;

[0029] Figure 4 This is a schematic diagram of the internal structure of a second porcelain sleeve in a mixing nozzle of a fuming furnace according to the present invention;

[0030] Figure 5 It is a front view structural schematic diagram of a mixing nozzle of a fumigation furnace of the present invention.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1. Nozzle, 11. Heating pipe section, 12. Plug-in pipe section, 2. Mixing pipe, 3. Primary coal-carrying air duct, 4. Secondary air duct, 5. First porcelain sleeve, 6. Second porcelain sleeve, 7. Sealing piece, 71. Steel ball, 72. Hollow bolt. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] like Figure 1 As shown, a fumigation furnace mixing nozzle comprises: a nozzle 1, a mixing tube 2, a primary coal-carrying air duct 3, a secondary air duct 4, a first porcelain sleeve 5, a second porcelain sleeve 6 and a plugging member 7,

[0035] The air inlet and outlet ends of the nozzle 1, the mixing tube 2, the primary coal-carrying air duct 3 and the secondary air duct 4 are connected in series and communicated in series in sequence through flanges. The air outlet end of the nozzle 1 is communicated with the air inlet of the fuming furnace. A primary coal-carrying air hole is provided on the pipe wall of the primary coal-carrying air duct 3, and a primary coal-carrying air inlet pipe 8 is fixed on and communicated with the primary coal-carrying air hole. A secondary air hole is provided on the pipe wall of the secondary air duct 4, and a secondary air inlet pipe 9 is fixed on and communicated with the secondary air hole. The first porcelain sleeve 5 is fixed in the nozzle 1; the second magnetic sleeve is fixed in the mixing tube 2; the blocking piece 7 is detachably connected to the pipe mouth end of the secondary air duct 4 away from the primary coal-carrying air duct 3.

[0036] In some specific embodiments, the nozzle 1 may include a heated pipe section 11 and a plug-in pipe section 12 which are arranged from away from the mixing tube 2 to close to the mixing tube 2 and are integrally connected. The plug-in pipe section 12 is plugged into the air inlet hole of the fuming furnace, and the heated pipe section 11 extends into the furnace of the fuming furnace; the air outlet end of the mixing tube 2 is fixed by a flange and connected to the air inlet end of the plug-in pipe section 12; the first porcelain sleeve 5 is inserted into the plug-in pipe section 12.

[0037] Specifically, the axes of the heated pipe section 11 and the inserted pipe section 12 are arranged at an angle α to the vertical line of the fuming furnace, and the angle α is 80° to 100°.

[0038] Specifically, the length of the heated pipe section 11 may be 10 to 100 mm.

[0039] like Figure 5 As shown, in some specific embodiments, the length of the plug-in pipe section 12 extending into the fuming furnace is L1, and L1 may be 5 to 50 mm.

[0040] Specifically, the heated pipe section 11 can be made of 304 stainless steel, and the inserted pipe section 12 can be made of cast steel.

[0041] In some specific embodiments, the mixing tube 2 and the second porcelain sleeve 6 are both variable diameter structures, and their diameters increase in sequence from close to the nozzle 1 to away from the nozzle 1 .

[0042] Specifically, the primary coal-carrying air duct 3 is a variable diameter structure and its diameter decreases in sequence from close to the nozzle 1 to away from the nozzle 1 .

[0043] like Figure 5 As shown, in some specific embodiments, the intersection between the axis of the primary coal-carrying air inlet pipe 8 and the axis of the primary coal-carrying air duct 3 is point A, and the angle between the axis of the primary coal-carrying air inlet pipe 8 and the axis of the primary coal-carrying air duct 3 is β; the intersection between the axis of the secondary air inlet pipe 9 and the axis of the secondary air duct 4 is point B, and the angle between the axis of the secondary air inlet pipe 9 and the axis of the secondary air duct 4 is γ; the intersection point where the axis of the nozzle 1 contacts the furnace wall of the fuming furnace is point C; the distance between point A and point B is L2, and the length of L2 is 150 to 200 mm, the distance between point B and point C is L3, and the length of L3 is 1000 to 1100 mm; the angle β is 30 to 35°, and the angle γ is 30 to 35°.

[0044] like Figure 2 As shown in some specific embodiments, the sealing member 7 includes a steel ball 71 and a hollow bolt 72; a thread is provided on the outer tube wall of the pipe mouth end of the secondary air duct 4 away from the primary coal-carrying air duct 3; the hollow bolt 72 is threadedly connected to the thread of the secondary air duct 4; the steel ball 71 rolls in the secondary air duct 4 and can be in sealing contact with the inner hole of the hollow bolt 72.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mixing nozzle for a fuming furnace, characterized in that: include: A nozzle (1), a mixing tube (2), a primary coal-carrying air duct (3), a secondary air duct (4), a first porcelain sleeve (5), a second porcelain sleeve (6) and a plugging member (7), The air inlet end and the air outlet end of the nozzle (1), the mixing tube (2), the primary coal-carrying air duct (3) and the secondary air duct (4) are connected in series and communicated in series in sequence through flanges; the air outlet end of the nozzle (1) is communicated with the air inlet of the fuming furnace; a primary coal-carrying air hole is provided on the tube wall of the primary coal-carrying air duct (3); a primary coal-carrying air inlet duct (8) is fixed on and communicated with the primary coal-carrying air hole; a secondary air hole is provided on the tube wall of the secondary air duct (4); a secondary air inlet duct (9) is fixed on and communicated with the secondary air hole; the first porcelain sleeve (5) is fixed in the nozzle (1); the second magnetic sleeve is fixed in the mixing tube (2); the blocking member (7) is detachably connected to the tube mouth end of the secondary air duct (4) away from the primary coal-carrying air duct (3).

2. A fumigation furnace mixing nozzle according to claim 1, characterized in that: The nozzle (1) comprises a heated pipe section (11) and a plug-in pipe section (12) which are arranged from away from the mixing pipe (2) to close to the mixing pipe (2) and are integrally connected; the plug-in pipe section (12) is plugged into the air inlet hole of the fuming furnace, and the heated pipe section (11) extends into the furnace of the fuming furnace; the air outlet end of the mixing pipe (2) is fixed by a flange and is connected to the air inlet end of the plug-in pipe section (12); the first porcelain sleeve (5) is inserted into the plug-in pipe section (12).

3. A fumigation furnace mixing nozzle according to claim 2, characterized in that: The axes of the heated pipe section (11) and the plug-in pipe section (12) are arranged at an angle α to the vertical line of the fuming furnace, and the angle α is 80° to 100°.

4. A fumigation furnace mixing nozzle according to claim 2, characterized in that: The length of the heated pipe section (11) is 10 to 100 mm.

5. The mixing nozzle of a fuming furnace according to claim 2, characterized in that: The length of the plug-in pipe section (12) extending into the fuming furnace is L1, and L1 is 5 to 50 mm.

6. A fumigation furnace mixing nozzle according to claim 2, characterized in that: The heated pipe section (11) is made of 304 stainless steel, and the inserted pipe section (12) is made of cast steel.

7. The mixing nozzle of a fuming furnace according to claim 1, characterized in that: The mixing tube (2) and the second porcelain sleeve (6) are both variable diameter structures, and their diameters increase in sequence from the direction close to the nozzle (1) to the direction away from the nozzle (1).

8. The mixing nozzle of a fuming furnace according to claim 1, characterized in that: The primary coal-carrying air pipe (3) is a variable diameter structure, and its diameter decreases in sequence from the direction close to the nozzle (1) to the direction away from the nozzle (1).

9. The mixing nozzle of a fuming furnace according to claim 1, characterized in that: The intersection point between the axis of the primary coal-carrying air inlet pipe (8) and the axis of the primary coal-carrying air duct (3) is point A, and the angle between the axis of the primary coal-carrying air inlet pipe (8) and the axis of the primary coal-carrying air duct (3) is β; the intersection point between the axis of the secondary air inlet pipe (9) and the axis of the secondary air duct (4) is point B, and the angle between the axis of the secondary air inlet pipe (9) and the axis of the secondary air duct (4) is γ; the intersection point where the axis of the nozzle (1) contacts the furnace wall of the fuming furnace is point C; the distance between point A and point B is L2, and the length of L2 is 150 to 200 mm; the distance between point B and point C is L3, and the length of L3 is 1000 to 1100 mm; the angle β is 30 to 35°, and the angle γ is 30 to 35°.

10. The mixing nozzle of a fuming furnace according to claim 1, characterized in that: The blocking member (7) comprises a steel ball (71) and a hollow bolt (72); a thread is provided on the outer wall of the secondary air duct (4) at the end of the pipe opening away from the primary coal-carrying air duct (3); the hollow bolt (72) is threadedly connected to the thread of the secondary air duct (4); the steel ball (71) rolls in the secondary air duct (4) and can be in sealing contact with the inner hole of the hollow bolt (72).

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