A pulse soot blower using venturi premixed air and acetylene

Abstract

The invention discloses a pulse sootblower utilizing venturi premixed air and acetylene, comprising an air cylinder, an acetylene cylinder, a valve, a flow meter, a connecting pipe, a venturi tube and a sootblower, wherein the venturi tube comprises an inlet section, a gradually contracting section, a throat, a gradually expanding section, an outlet section and an ejection hole, and the sootblower comprises an air inlet valve, a combustion chamber, an igniter, a nozzle section and an end cover, and the nozzle section of the sootblower comprises a magnet block, a magnet hole and a connecting shaft. Air and acetylene gas are fully mixed through the venturi tube, enter the sootblower for combustion and explosion, and the generated high-temperature and high-pressure flue gas pushes the right end cover of the sootblower to open and rushes to the sootblowing part to achieve a sootblowing effect. By adjusting the valve opening of different gas cylinders, the flow of acetylene and air can be adjusted, and the mixing ratio of the gas can be changed. The invention can achieve full mixing of air and acetylene gas in proportion, and the cooperation of the end cover at the outlet of the sootblower and the magnet can achieve the sealing of the sootblower in the gas transmission stage before ignition.

Description

Technical Field

[0001] The invention relates to the field of gas premixing combustion, in particular to a pulse soot blower utilizing Venturi premixing of air and acetylene. Background Art

[0002] Gas pulse soot blower is a new generation of soot blowing technology with advanced performance, excellent effect, reliable operation, simple operation and maintenance. It uses acetylene and other common combustible gases and air in a certain proportion to burn and blow soot. Different from the conventional combustion process, the rapid combustion and explosion of the mixed gas in the gas pulse soot blower can generate high-temperature and high-pressure flue gas. After the high-temperature and high-pressure flue gas is ejected from the nozzle of the output pipe, it acts on the heated surface, thereby causing the accumulated ash to fall off.

[0003] The Venturi tube has a simple structure and low manufacturing and maintenance costs. It has been widely used in various fields such as production and life, such as flow measurement, gas mixing, liquid impurity removal, etc. The pulse soot blower needs to premix acetylene and air before combustion and explosion. The traditional gas pulse soot blower sends the two gases into the mixer separately and then mixes them. The mixing effect is not good and the device is complicated. Therefore, a pulse soot blower that uses Venturi to premix air and acetylene has become one of the technical keys in this field. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a pulse soot blower using Venturi premixed air and acetylene, which can achieve full mixing of air and acetylene gas in proportion and prevent the mixed gas from flowing out of the soot blowing tank outlet before combustion and explosion.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is:

[0006] A pulse soot blower using venturi premixed air and acetylene comprises an air cylinder a1, an acetylene cylinder b2, a valve a3, a valve b4, a flow meter a5, a flow meter b6, a connecting pipe a7, a connecting pipe b8, a venturi tube 9, a connecting pipe c10 and a soot blowing tank 11.

[0007] The air cylinder a1, valve a3, flowmeter a5, connecting pipe a7 and the inlet section 91 of the venturi tube 9 are connected in sequence through flanges to form an air gas pipeline; the acetylene cylinder b2, valve b4, flowmeter b6, connecting pipe b8 and the ejection hole 96 of the venturi tube 9 are connected in sequence through flanges to form an acetylene gas pipeline; the outlet section 95 of the venturi tube 9, the connecting pipe c10 and the air inlet valve 111 of the sootblower 11 are connected in sequence through flanges to form an air-acetylene mixed gas delivery pipeline.

[0008] The venturi tube 9 includes an inlet section 91, a tapered section 92, a throat 93, a gradually expanding section 94, an outlet section 95 and an ejection hole 96. The tapered angle of the tapered section 92 is 16 degrees, and the gradually expanding angle of the gradually expanding section 94 is 7 degrees; the throat 93 has a circular cross-section, an inner diameter of 18 mm, and a length of 30 mm; the ejection hole 96 has a circular cross-section, an inner diameter of 10 mm, and an outer diameter of 12 mm.

[0009] The sootblower 11 includes an air intake valve 111, a combustion chamber 112, an igniter 113, a nozzle section 114 and an end cover 115; wherein the nozzle section 114 includes a magnet block a1141, a magnet hole a1142, a connecting shaft 1143, a magnet hole b1144 and a magnet block b1145, the magnet block a1141 is a rectangular parallelepiped with a length of 20 mm, a width of 8 mm and a height of 4 mm, the magnet hole b1144 is a semicircular arch with an inner diameter of 44 mm and an outer diameter of 46 mm; the end cover 115 includes a shaft sleeve 1151 and a cover plate 1152, and the end cover 115 is made of iron material.

[0010] A connecting shaft 1143 is disposed on the nozzle section 114 of the sootblowing pot 11 , and a shaft sleeve 1151 is disposed on the upper portion of the end cover 115 , and the shaft sleeve 1151 matches with the connecting shaft 1143 .

[0011] The gas pulse soot blower adopts the above-mentioned pipeline arrangement and valve adjustment method, requiring the air source pressure to be 0.25-0.60MPa and the acetylene source pressure to be 0.10-0.15MPa, and the air-acetylene mixing ratio of the explosion soot blowing process is 11.5-12.6. If other air-acetylene mixing ratios are required, it is necessary to change the structural parameters of the system, especially the venturi tube 9. Therefore, if the air-acetylene mixing ratio exceeds the above-mentioned air-acetylene mixing ratio, it is not within the protection scope of this patent. At the same time, the outer diameter of the venturi tube 9 and the connecting pipes, valves, and flow meters can be determined according to the site conditions, which are not required by this patent and are not within the protection scope of this patent.

[0012] During the sootblowing process, the flow rates of air and acetylene are determined according to the required explosion energy, and the flow rates of air and acetylene are detected by flowmeter a5 and flowmeter b6. When the gas pulse sootblower performs sootblowing, the air inlet valve 111 of the sootblowing tank 11, the valve a3 of the air cylinder a1, and the valve b4 of the acetylene cylinder b2 are opened in sequence, and all are in a fully open state. The valve a3 is adjusted to observe the reading of the flowmeter a5 and reach a certain value, and then the valve b4 is adjusted to observe the reading of the flowmeter b6 and reach a certain value, and then the air inlet valve 111 of the sootblowing tank 11 is closed, and the valve b4 of the acetylene cylinder b2 and the valve a3 of the air cylinder a1 are closed in sequence, and the igniter 113 is started to ignite, and the explosion sootblowing in the furnace is performed; after the sootblowing stops, the air inlet valve 111 of the sootblowing tank 11 and the end cover 115 at the right end of the sootblowing tank 11 are closed, so that the end cover 115 fits with the right end of the nozzle section 114.

[0013] The beneficial effects of the present invention are:

[0014] Compared with a sootblower in which conventional fuel gas and air are directly input into a combustion chamber for combustion and explosion sootblowing, a pulse sootblower of the present invention which utilizes a venturi tube to mix acetylene and air can realize full premixing of the two gases in proportion, thereby improving the combustion and explosion effect; high-temperature and high-pressure flue gas generated by the combustion and explosion is utilized to push the end cover adsorbed by a magnet to open, thereby preventing gas leakage when gas is input before explosion ignition. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional front view of a pulse soot blower using venturi premixed air and acetylene according to the present invention;

[0016] Figure 2 A three-dimensional view of a venturi tube of a pulse soot blower using venturi premixed air and acetylene according to the present invention;

[0017] Figure 3 A cross-sectional view of a tapered section of a venturi tube of a pulse soot blower utilizing venturi premixed air and acetylene according to the present invention;

[0018] Figure 4 A cross-sectional view of a gradually expanding section of a venturi tube of a pulse soot blower utilizing venturi premixed air and acetylene according to the present invention;

[0019] Figure 5 A three-dimensional view of a sootblower tank of a pulse sootblower using venturi premixed air and acetylene according to the present invention;

[0020] Figure 6 A three-dimensional view of an outlet section of a sootblower of a pulse sootblower using venturi premixed air and acetylene according to the present invention;

[0021] Figure 7 A three-dimensional view of an end cover of a sootblower tank of a pulse sootblower using venturi premixed air and acetylene according to the present invention;

[0022] Figure 8 A three-dimensional view of a closed state of an outlet end cover of a sootblower of a pulse sootblower using venturi premixed air and acetylene according to the present invention;

[0023] Fig. 9 The present invention is a three-dimensional view of a sootblowing tank of a pulse sootblower using venturi premixed air and acetylene in an open state of an outlet section end cover. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] The present invention is a pulse sootblower utilizing venturi premixed air and acetylene, comprising an air cylinder a1, an acetylene cylinder b2, a valve a3, a valve b4, a flow meter a5, a flow meter b6, a connecting pipe a7, a connecting pipe b8, a venturi tube 9, a connecting pipe c10 and a sootblowing pot 11; the venturi tube 9 comprises an inlet section 91, a tapered section 92, a throat 93, a gradually expanding section 94, an outlet section 95 and an ejection hole 96; the sootblowing pot 11 comprises an air intake valve 111, a combustion chamber 112, an igniter 113, a nozzle section 114 and an end cover 115; the nozzle section 114 comprises a magnet block a1141, a magnet hole a1142, a connecting shaft 1143, a magnet hole b1144 and a magnet block b1145; the end cover 115 comprises a shaft sleeve 1151 and a cover plate 1152.

[0026] Reference Figure 1 The air cylinder a1, valve a3, flow meter a5, connecting pipe a7 and the inlet section 91 of the venturi tube 9 are connected in sequence through flanges to form an air gas pipeline; the acetylene cylinder b2, valve b4, flow meter b6, connecting pipe b8 and the ejection hole 96 of the venturi tube 9 are connected in sequence through flanges to form an acetylene gas pipeline; the outlet section 95 of the venturi tube 9, the connecting pipe c10 and the air inlet valve 111 of the sootblower 11 are connected in sequence through flanges to form an air-acetylene mixed gas delivery pipeline.

[0027] Reference Figure 2 The venturi tube 9 includes an inlet section 91, a tapered section 92, a throat 93, a diverging section 94, an outlet section 95 and an ejection hole 96. The throat 93 has a circular cross section, an inner diameter of 18 mm and a length of 30 mm. The ejection hole 96 has a circular cross section, an inner diameter of 10 mm and an outer diameter of 12 mm. The small wireframe arrows in the figure indicate the direction in which the ejected gas acetylene enters the venturi tube 9, the medium wireframe arrows indicate the direction in which the mainstream gas air enters the venturi tube 9, and the large wireframe arrows indicate the direction in which the fully mixed air-acetylene mixed gas flows out of the venturi tube 9. Refer to Figure 3 The angle between the extension line of the tangent line on the wall of the tapered section 92 and the center line of the venturi tube 9 is 16 degrees, that is, the tapered angle of the tapered section 92 is 16 degrees. Figure 4 The angle between the extension line of the tangent line of the wall surface of the gradually expanding section 94 and the center line of the venturi tube 9 is 7 degrees, that is, the gradually expanding angle of the gradually expanding section 94 is 7 degrees.

[0028] Reference Figure 5 and Figure 6The sootblower 11 includes an air inlet valve 111, a combustion chamber 112, an igniter 113, a nozzle section 114 and an end cover 115; wherein the nozzle section 114 includes a magnet block a1141, a magnet hole a1142, a connecting shaft 1143, a magnet hole b1144 and a magnet block b1145. The magnet block a1141 is a rectangular parallelepiped with a length of 20 mm, a width of 8 mm and a height of 4 mm. The upper part of the nozzle section 114 has a magnet hole a1142 of the same size, and the magnet block a1141 can be embedded in the magnet hole a1142; the magnet hole b1144 is a semicircular arch with an inner diameter of 44 mm and an outer diameter of 46 mm. The right end of the nozzle section 114 has a magnet hole b1144 of the same size, and the magnet block b1145 can be embedded in the magnet hole b1144. Figure 7 The end cover 115 includes a shaft sleeve 1151 and a cover plate 1152. The end cover 115 is made of iron material and can be attracted by a magnet. The shaft sleeve 1151 is arranged on the upper part of the end cover 115, and the shaft sleeve 1151 is matched with the connecting shaft 1143.

[0029] In this gas pulse soot blower, the air-acetylene mixing ratio is the volume ratio of air and acetylene gas in the mixed gas. Because the flow meters a5 and b6 show volume flow rates, the air-acetylene mixing ratio can also be expressed as the flow ratio of air and acetylene gas.

[0030] The following takes acetylene and air mixed soot blowing as an example to introduce the specific implementation process. In the air and acetylene mixed air intake stage, first, Figure 5 As shown, the air inlet valve 111 of the soot blowing tank 11 is opened, and the end cover 115 at the right end of the soot blowing tank 11 is closed. Figure 8 As shown, the end cap 115 is fitted with the right end of the nozzle section 114 to prevent gas from escaping; secondly, as shown Figure 1 As shown, the valve a3 of the air cylinder a1 is opened, and the air flows out from the air cylinder a1, and passes through the valve a3, the flow meter a5 and the connecting pipe a7 to the venturi tube 9 in sequence; then the valve b4 of the acetylene cylinder b2 is opened, and the acetylene gas flows out from the acetylene cylinder b2, and passes through the valve b4, the flow meter b6 and the connecting pipe b8 to the venturi tube 9 in sequence, and the above two gases are fully mixed in the venturi tube 9 to become an air-acetylene mixed gas. The air-acetylene mixing ratio can be changed by adjusting the opening of valve a3. By adjusting valve a3 to a smaller opening, the minimum air-acetylene mixing ratio (11.5) required for explosion soot blowing can be met; by adjusting valve a3 to a medium opening, the air-acetylene mixing ratio (12.0) required for full reaction of acetylene and air can be met; by adjusting valve a3 to a larger opening, the air-acetylene mixing ratio (12.6) required for complete combustion of acetylene can be met; finally, the air-acetylene mixed gas flows out from the outlet section 95 of the venturi tube 9 and enters the soot blowing tank 11 from the air inlet valve 111 via the connecting pipe c10. In the pulse soot blowing stage, Figure 5As shown in FIG. 1 , when the air-acetylene mixed gas fills the sootblowing tank 11, the air inlet valve 111 of the sootblowing tank 11 is closed, and the igniter 113 is started to ignite, so that the mixed gas burns and explodes rapidly, generating high-temperature and high-pressure flue gas. The high-temperature and high-pressure flue gas quickly diffuses to the sootblowing tank nozzle section 114, pushing the end cover 115 at the right end of the sootblowing tank 11 to open. The state after opening is as shown in FIG. Fig. 9 As shown, the soot blowing effect can be achieved by rushing the high-temperature and high-pressure flue gas to the soot blowing part.

[0031] At venturi 9, refer to Figure 2 , the mainstream air enters the venturi tube 9 from the inlet section 91 along the direction indicated by the medium-sized wireframe arrow, and the flow velocity is accelerated and the pressure is reduced after passing through the tapered section 92, forming a low-pressure area at the throat 93. The pressure of the acetylene gas is higher than the air pressure at the throat 93. Due to the pressure difference, the acetylene gas enters the throat 93 of the venturi tube 9 from the injection hole 96 along the direction of the small-sized wireframe arrow, merges with the mainstream air, and then the two are fully mixed at the gradually expanding section 94, and finally flow out of the venturi tube 9 from the outlet section 95 along the direction of the large-sized wireframe arrow. The above process can achieve uniform and full mixing of air and acetylene gas. According to the combustion reaction of acetylene: 2C2H2+5O2→4CO2+2H2O, combined with the volume content of oxygen in the air of about 21%, when the flow rate of the air-acetylene mixed gas is Q1 m3 / h, the flow rate of the air is 0.92Q1 m3 / h, and the flow rate of the acetylene gas is 0.08Q1 m3 / h. This is the minimum air-acetylene mixing ratio required for explosive soot blowing. When the air-acetylene mixing ratio is in the range of 11.5 to 12.6, the soot blowing effect can be met. Therefore, the gas pulse soot blower adopts the above-mentioned pipeline layout and valve adjustment method. The applicable working conditions should meet the air source pressure of 0.25 to 0.60MPa, the acetylene source pressure of 0.10 to 0.15MPa, and the air-acetylene mixing ratio of 11.5 to 12.6 during the explosive soot blowing process.

[0032] The working process of the end cover 115 is as follows: before the mixed gas is input into the soot blowing tank 11, Figure 8 As shown, the end cover 115 at the right end of the soot blowing tank 11 is closed, and the magnet block b1145 will absorb the end cover 115 to prevent gas leakage. After the mixed gas explodes, the high-temperature and high-pressure flue gas will push the end cover 115 to flip upward along the connecting shaft 1143. When it flips to the upper part of the nozzle section 114, the magnet block a1141 will absorb the end cover 115, as shown in FIG. Fig. 9 As shown, it is prevented from colliding back and forth and affecting the soot blowing effect. After the soot blowing is completed, the end cover 115 is restored to the closed state to close the entire soot blowing and ejection system, and then the next soot blowing can be carried out.

[0033] In summary, the present invention utilizes a venturi tube to mix acetylene and air, so that the two gases can be fully premixed in proportion, thereby improving the effect of combustion and explosion; the high-temperature and high-pressure flue gas generated by the combustion and explosion is used to push the end cover adsorbed by the magnet to open, thereby preventing leakage when inputting gas before explosion ignition.

Claims

1. A pulse soot blower using Venturi premixed air and acetylene, characterized in that: The invention comprises an air cylinder a (1), an acetylene cylinder b (2), a valve a (3), a valve b (4), a flow meter a (5), a flow meter b (6), a connecting pipe a (7), a connecting pipe b (8), a venturi tube (9), a connecting pipe c (10) and a soot blowing tank (11); the venturi tube (9) comprises an inlet section (91), a tapered section (92), a throat (93), a gradually expanding section (94), an outlet section (95) and an ejection hole (96); the tapered angle of the tapered section (92) is 16 degrees, and the gradually expanding angle of the gradually expanding section (94) is 7 degrees; the throat (93) has a circular cross section with an inner diameter of 18 mm and a length of 30 mm; the ejection hole (96) has a circular cross section with an inner diameter of 10 mm and an outer diameter of 10 mm. The sootblower (11) comprises an air inlet valve (111), a combustion chamber (112), an igniter (113), a nozzle section (114) and an end cover (115); wherein the nozzle section (114) comprises a magnet block a (1141), a magnet hole a (1142), a connecting shaft (1143), a magnet hole b (1144) and a magnet block b (1145); the magnet block a (1141) is a rectangular parallelepiped with a length of 20 mm, a width of 8 mm and a height of 4 mm; the magnet hole b (1144) is a semicircular arch with an inner diameter of 44 mm and an outer diameter of 46 mm; the end cover (115) comprises a shaft sleeve (1151) and a cover plate (1152); the end cover (115) is made of iron material.

2. The pulse soot blower using Venturi premixed air and acetylene according to claim 1, characterized in that: The air cylinder a (1), valve a (3), flow meter a (5), connecting pipe a (7) and the inlet section (91) of the venturi tube (9) are connected in sequence through flanges to form an air gas pipeline; the acetylene cylinder b (2), valve b (4), flow meter b (6), connecting pipe b (8) and the ejection hole (96) of the venturi tube (9) are connected in sequence through flanges to form an acetylene gas pipeline; the outlet section (95) of the venturi tube (9), connecting pipe c (10) and the air inlet valve (111) of the sootblower (11) are connected in sequence through flanges to form a pipeline for conveying air-acetylene mixed gas.

3. The pulse soot blower using Venturi premixed air and acetylene according to claim 1, characterized in that: A connecting shaft (1143) is arranged on the nozzle section (114) of the sootblowing pot (11), and a shaft sleeve (1151) is arranged on the upper part of the end cover (115), and the shaft sleeve (1151) matches with the connecting shaft (1143).

4. The pulse soot blower using Venturi premixed air and acetylene according to claim 1, characterized in that: The air source pressure is required to be 0.25~0.60MPa, the acetylene source pressure is required to be 0.10~0.15MPa, and the air-acetylene mixing ratio during the explosion soot blowing process is required to be 11.5~12.

6.

5. The pulse soot blower using Venturi premixed air and acetylene according to claim 1, characterized in that: In the air-injected acetylene mixed air intake stage, the air intake valve (111) of the sootblowing tank (11), the valve a (3) of the air cylinder a (1) and the valve b (4) of the acetylene cylinder b (2) are opened in sequence, the valve a (3) is first adjusted to make the flow meter a (5) reach a preset flow rate, and then the valve b (4) is adjusted to make the flow meter b (6) reach a preset flow rate, and then the air intake valve (111) of the sootblowing tank (11) is closed, and the valve b (4) of the acetylene cylinder b (2) and the valve a (3) of the air cylinder a (1) are closed in sequence, and the igniter (113) is started to ignite, and explosive sootblowing is performed in the furnace; after the sootblowing stops, the air intake valve (111) of the sootblowing tank (11) and the end cover (115) at the right end of the sootblowing tank (11) are closed, so that the end cover (115) fits the right end of the nozzle section (114).

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