A steam slag blowing system for bagasse boiler grate

Abstract

A steam slag blowing system for a bagasse boiler grate, comprising a slag blowing nozzle, a gas distribution pipe I, a gas distribution pipe II and a steam header; the number of the slag blowing nozzles is multiple, evenly installed on the grate, and arranged in multiple rows from the front side to the rear side of the furnace; the gas distribution pipe I is installed below the grate at the bottom of the frontmost row of slag blowing nozzles, and the frontmost row of slag blowing nozzles are connected to the gas distribution pipe I through connecting pipes; the gas distribution pipe II is installed below the grate at the bottom between every two rows of slag blowing nozzles except the frontmost row of slag blowing nozzles, and there are two rows of slag blowing nozzles between every two rows of gas distribution pipe II, and the two sides of the gas distribution pipe II are connected to the slag blowing nozzles on both sides through connecting pipes, and each row of gas distribution pipe II provides steam for the two rows of slag blowing nozzles; the gas distribution pipe I and the gas distribution pipe II are connected to the steam header for steam supply through gas transmission pipes and gas outlet valves. The steam slag blowing system uses steam to blow the bagasse on the boiler grate, and the grate is not easy to be coked and blocked.

Description

Technical Field

[0001] The invention relates to the technical field of boiler equipment, in particular to a steam slag blowing system for a bagasse boiler grate. Background Art

[0002] Bagasse is a waste produced in the sugar production process, but it is also a valuable fuel energy. If it is directly discarded as industrial waste, it will not only waste the energy, but also pollute the environment; therefore, bagasse is currently used as boiler fuel, so that the steam generated by the boiler is used for power supply and steam supply, which not only makes rational use of energy, but also protects the social environment.

[0003] However, the moisture content of bagasse is high and the calorific value is low, which causes the ash melting point of its combustion to be low. This ash is very easy to block the tuyere on the grate, which is not easy to fully burn bagasse on the one hand, and causes the grate surface to coke and accumulate heat on the other hand, which eventually affects the service life of the grate. And the grate of the existing bagasse boiler is a conventional large scale grate, which is not only complex in structure and costly, but also very easy to coke and accumulate heat on the grate surface, which causes its service life to be shorter, so it has been gradually eliminated by the market. Another is a water-cooled grate, although this grate can reduce its surface temperature by water circulation, thereby extending its service life, it can also reduce the temperature in the furnace, thereby causing the chain effect of incomplete drying, incomplete combustion, and higher carbon content of fly ash of bagasse, and then causing a large amount of fly ash and insufficiently burned bagasse to coke on the grate surface, and block each tuyere, which eventually causes the thermal efficiency of the boiler to be very low. Summary of the invention

[0004] The object of the present invention is to provide a steam slag blowing system for a bagasse boiler grate, which utilizes steam to blow the bagasse on the boiler grate, so that the grate is not easily coked and blocked.

[0005] In order to achieve the purpose of the present invention, the technical solution adopted is:

[0006] A steam slag blowing system for a bagasse boiler grate comprises slag blowing nozzles, an air distribution pipe I, an air distribution pipe II and a steam header; the number of the slag blowing nozzles is multiple, evenly installed on the grate, and arranged in multiple rows from the front side to the rear side of the furnace; the air distribution pipe I is installed below the grate at the bottom of the frontmost row of slag blowing nozzles, and the frontmost row of slag blowing nozzles are connected to the air distribution pipe I through connecting pipes; the air distribution pipes II are installed below the grate at the bottom between every two rows of slag blowing nozzles except the frontmost row, and there are two rows of slag blowing nozzles between every two rows of air distribution pipes II, and the two sides of the air distribution pipe II are connected to the slag blowing nozzles on both sides thereof through connecting pipes, and each row of air distribution pipes II provides steam for the two rows of slag blowing nozzles; the air distribution pipes I and the air distribution pipes II are connected to the steam header for supplying steam through gas transmission pipes and gas outlet valves respectively.

[0007] The steam manifold comprises a sealed pipe body, a bracket is installed at the lower part of the pipe body, and a plurality of gas ports are arranged on the pipe body, one of which is connected to a vent pipe for inputting steam into the steam manifold through an air inlet valve, and the remaining gas ports are connected to the gas distribution pipe through the air supply pipe and the air outlet valve.

[0008] A water delivery pipe is arranged at the lower part of the steam header, and a steam trap is installed on the water delivery pipe.

[0009] The steam header is provided with a pressure test port, and a pressure gauge assembly is installed on the pressure test port. The pressure gauge assembly includes a stop valve, a pressure gauge elbow, a stop valve for the pressure gauge and a pressure gauge.

[0010] The upper part of the gas distribution pipe I is evenly provided with multiple gas distribution ports connected to the connecting pipe, and the lower part is provided with a vent connected to the gas supply pipe; the two sides of the gas distribution pipe II are evenly provided with multiple gas distribution ports connected to the connecting pipe, and the lower part is provided with a vent connected to the gas supply pipe.

[0011] The grate comprises a grate sheet, which is composed of a square top plate and side plates, and the side plates are mutually surrounded around the bottom of the top plate; the grate sheet is integrally cast; a plurality of air holes with small upper part and large lower part and a bolt hole are vertically and evenly distributed on the top plate; the grate sheet is divided into a grate sheet with nozzle holes and a grate sheet without nozzle holes; the grate sheet with nozzle holes is further divided into a multi-hole grate sheet with nozzle holes and a grate sheet with few holes with nozzle holes; the grate sheet without nozzle holes is further divided into a multi-hole grate sheet without nozzle holes and a grate sheet without few holes without nozzle holes; the air hole opening rate of the grate sheet with few holes in the nozzle hole and the grate sheet without few holes in the nozzle hole is 3.25%; the air hole opening rate of the multi-hole grate sheet with nozzle holes and the multi-hole grate sheet without nozzle holes is 5 .24%; multiple grate slices are evenly installed on the supporting beam of the grate bracket through bolts in the bolt holes to form a grate. From the front side of the furnace to the back side of the furnace, a row of grate slices with nozzle holes is installed behind every two rows of grate slices without nozzle holes. The first four rows of grate slices without nozzle holes are composed of multiple grate slices without nozzle holes and few holes. The first row of grate slices with nozzle holes is composed of multiple grate slices with nozzle holes and few holes. The remaining rows of grate slices without nozzle holes and grate slices with nozzle holes are respectively composed of multiple porous grate slices without nozzle holes and porous grate slices with nozzle holes. The distance between adjacent grate slices is 4 mm. The gap between the grate slices can meet the requirements of grate slice expansion and ensure that the grate air leakage rate is within the allowable range. A nozzle installation hole is opened in the middle of the top plate of the grate slice with nozzle holes. The nozzle installation hole is installed with a nozzle that can spray steam. Each nozzle has the same blowing direction and sprays along the grate surface. The opening rate on the grate meets the requirements of bagasse combustion. The front row of the furnace uses grates with a small opening rate, and the rest use grates with a larger opening rate to meet the combustion requirements of different areas. This arrangement will not affect the stability of combustion in the furnace due to steam slag blowing.

[0012] The grate is lower in front and higher in the back, with an inclination of 8°.

[0013] The nozzle includes a nozzle head, which is semi-cylindrical; a flat nozzle is arranged on one side of the semi-cylindrical nozzle head; a square cylinder limiting body is arranged at the lower part of the nozzle head, a locking thread body is arranged at the lower part of the square cylinder limiting body, and a steam pipe connecting body is arranged at the lower part of the locking thread body; the diameter of the square cylinder limiting body is smaller than the width of the nozzle head and larger than the diameter of the locking thread body; steam channels are arranged in the square cylinder limiting body, the locking thread body and the steam pipe connecting body, and the steam channel runs through the bottom of the steam pipe connecting body to the nozzle head and is connected with the nozzle. The length of the square cylinder limiting body is less than or equal to the depth of the square countersunk hole for installing the grate nozzle. The square cylinder limiting body and the square countersunk hole for installing the grate nozzle are clearance matched. During installation, the nozzle is inserted into the square countersunk hole for installing the nozzle from the top of the grate. The nozzle head is stuck on the grate surface. The square cylinder limiting body extends into the square countersunk hole for installing the nozzle. Finally, the nozzle is fixed on the grate by the spring washer and nut installed on the locking thread body. The steam pipe connecting body is connected to the connecting pipe. With such a structure, the nozzle can be firmly installed on the grate surface and is not easy to shift.

[0014] The steam channel is a circular steam channel, the aperture of which is smaller than the width of the nozzle, and the steam channel is connected to both sides of the nozzle in a gradual transition.

[0015] The lower connecting surface of the nozzle and the steam channel is horizontal, and the upper connecting surface of the nozzle and the steam channel is inclined upward at an angle of 3-5 degrees, and is inclined upward toward the steam channel side, and the intersection with the steam channel is an arc transition. The nozzle and the steam channel are arranged in this way, steam can be diffused and ejected from the nozzle, and the ejection is powerful, the effective area of ​​slag blowing is wide, and multiple nozzles are used in combination, and dead corners are not easy to exist.

[0016] The two ends and the edges and corners of the semi-cylindrical nozzle head are polished smooth, and the end of the semi-cylindrical nozzle head without the nozzle is set to a hemispherical surface. Since the grate in the boiler furnace occasionally needs to be manually scraped and raked, the nozzle head is set in this way, which is not easy to get stuck during manual scraping and raking.

[0017] Before installation, the grate plates must be inspected to determine whether there are any serious rust, cracks or other defects. The overall dimensions should meet the requirements of the drawings, and the allowable error should meet the regulations. Before installation, the steam nozzle, gasket, nut and grate plates should be assembled and installed. Pre-weld the grate positioning plates, test the grate plates without problems, then install the remaining grate positioning plates, and then install all the grate plates. Install the grate locking parts at the same time. When installing the grate plates, the expansion gap between the grate plates must be ensured. After the grate is installed, there must be no debris blocking the small holes and expansion gaps on the grate, and the grate unevenness and diagonal deviation are less than 5mm. The head of the steam nozzle should face the front of the furnace.

[0018] The slag blowing steam adopts saturated steam with a working pressure of 2.45MPa. The required steam is directly drawn from the auxiliary steam pipe of the boiler drum, and enters the steam header after passing through the pressure reducing valve; before using the steam soot blowing system for blowing each time, it is necessary to open the steam trap on the steam header to drain the condensate in the header, and then open the steam valve on the main pipe; when using the steam soot blowing system for blowing, because the slag trough is in front of the furnace, the principle of from back to front must be followed, that is, first open the blowing system of the group behind the furnace, and then open the remaining blowing systems in order from back to front, and finally blow the slag into the slag trough; blowing should be carried out in sequence from one side to the other; the length of the blowing time should be determined during operation according to the characteristics of the fuel (bagasse), the ash content of the fuel, and the amount of slag on the grate.

[0019] The steam slag blowing system of the bagasse boiler grate has the following advantages:

[0020] 1. The grate structure is cleverly arranged and adopts saturated steam blowing, which can not only avoid grate blockage and coking, but also make the bagasse in the furnace burn more fully.

[0021] 2. The nozzle head of the nozzle used in the grate is provided with a square cylinder limiting body at the bottom, a locking thread body is provided at the bottom of the square cylinder limiting body, and a steam pipe connecting body is provided at the bottom of the locking thread body; the diameter of the square cylinder limiting body is smaller than the width of the nozzle head and larger than the diameter of the locking thread body; the square cylinder limiting body, the locking thread body and the steam pipe connecting body are all provided with steam channels, and the steam channel runs from the bottom of the steam pipe connecting body to the nozzle head and is connected with the nozzle; the length of the square cylinder limiting body is less than or equal to The depth of the square countersunk hole for installing the grate nozzle, the square column limiting body and the square countersunk hole for installing the grate nozzle are clearance-matched. During installation, the nozzle is inserted into the square countersunk hole for installing the nozzle from the top of the grate, the nozzle head is stuck on the grate surface, the square column limiting body extends into the square countersunk hole for installing the nozzle, and finally the nozzle is fixed on the grate by the spring washer and nut installed on the locking thread body; the steam pipe connecting body is connected to the connecting pipe; with such a structure, the nozzle can be firmly installed on the grate surface and is not easy to shift.

[0022] 3. The nozzle head of the nozzle used in this grate is semi-cylindrical; a flat nozzle is arranged on one side of the semi-cylindrical nozzle head, the steam channel is a circular steam channel, the aperture of which is smaller than the width of the nozzle, the steam channel and the two sides of the nozzle are connected by a gradual transition, the lower connecting surface of the nozzle and the steam channel is horizontal, the upper connecting surface of the nozzle and the steam channel is inclined upward at an angle of 3-5 degrees, and is inclined upward toward the steam channel side, and the intersection with the steam channel is an arc transition. The nozzle and the steam channel are arranged in this way, the steam can be diffused and ejected from the nozzle, and the ejection is powerful, the effective area of ​​slag blowing is wide, and multiple nozzles are used in combination, and dead corners are not easy to exist.

[0023] 4. The nozzle used in this grate is semi-cylindrical, and the edges and corners of the nozzle head on both ends and both sides are polished smooth, so it is not easy to get stuck when manually scraping the grate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the arrangement of the steam slag blowing system of the grate of the bagasse boiler;

[0025] Figure 2 yes Figure 1 A top view of

[0026] Figure 3 yes Figure 1 Left view of;

[0027] Figure 4 yes Figure 1 A partial enlarged view of

[0028] Figure 5 It is a schematic diagram of the structure of the steam header;

[0029] Figure 6 It is a schematic diagram of the structure of the gas distribution pipe I;

[0030] Figure 7 yes Figure 6 AA direction schematic diagram;

[0031] Figure 8 yes Figure 6 BB direction schematic diagram;

[0032] Fig. 9 It is a schematic diagram of the structure of the gas distribution pipe II;

[0033] Fig.10 yes Fig. 9 CC direction schematic diagram;

[0034] Fig.11 yes Fig. 9 DD direction schematic diagram;

[0035] Fig.12 It is a schematic diagram of the structure of the slag blowing nozzle;

[0036] Fig.13 yes Fig.12 A top view of

[0037] Fig.14 yes Fig.12 Left view of;

[0038] The names of the parts with serial numbers in the figure are:

[0039] 1. Gas transmission pipe, 2. Gas distribution pipe II, 3. Connecting pipe, 4. Slag blowing nozzle, 5. Gas distribution pipe I, 6. Air outlet valve, 7. Gas transmission port, 8. Steam header, 9. Bracket, 10. Air inlet valve, 11. Ventilation pipe, 12. Steam trap, 13. Water transmission pipe, 14. Pressure test port, 15. Stop valve, 16. Pressure gauge elbow, 17. Stop valve for pressure gauge, 18. Pressure gauge, 19. Gas distribution port, 20. Ventilation port, 21. Nozzle head, 22. Nozzle, 23. Square cylinder limiter, 24. Locking thread, 25. Steam channel, 26. Steam pipe connecting body. DETAILED DESCRIPTION

[0040] In order to describe the present technology more clearly, the present technology is further described in detail below with reference to the accompanying drawings and embodiments. Example

[0041] A steam slag blowing system for a bagasse boiler grate, comprising slag blowing nozzles 4, gas distribution pipes I5, gas distribution pipes II2 and a steam header 8; the number of the slag blowing nozzles 4 is multiple, evenly installed on the grate, and arranged in multiple rows from the front side to the rear side of the furnace; the gas distribution pipe I5 is installed below the grate at the bottom of the slag blowing nozzles 4 in the front row, and the slag blowing nozzles 4 in the front row are connected to the gas distribution pipes I5 through connecting pipes 3; the gas distribution pipes II2 are installed below the grate at the bottom between every two rows of slag blowing nozzles 4 except the front row, and there are two rows of slag blowing nozzles 4 between every two rows of gas distribution pipes II2, and the two sides of the gas distribution pipes II2 are connected to the slag blowing nozzles 4 on both sides thereof through connecting pipes 3, and each row of gas distribution pipes II2 provides steam for two rows of slag blowing nozzles 4; the gas distribution pipes I5 and the gas distribution pipes II2 are connected to the steam header 8 for steam supply through the gas transmission pipe 1 and the gas outlet valve 6 respectively.

[0042] The steam manifold 8 comprises a sealed pipe body, a bracket 9 is installed at the lower part of the pipe body, and a plurality of gas ports 7 are arranged on the pipe body, one of the gas ports 7 is connected to a vent pipe 11 for inputting steam into the steam manifold 8 through an air inlet valve 10, and the remaining gas ports 7 are connected to the gas distribution pipes through the gas pipe 1 and the air outlet valve 6.

[0043] A water delivery pipe 13 is provided at the lower part of the steam header 8, and a steam trap 12 is installed on the water delivery pipe 13.

[0044] The grate comprises a grate plate, which is composed of a square top plate and side plates, and the side plates are mutually surrounded around the bottom of the top plate; the grate plate is integrally cast; a plurality of air holes with small upper part and large lower part and a bolt hole are vertically and evenly distributed on the top plate; the grate plate is divided into a grate plate with nozzle holes and a grate plate without nozzle holes, the grate plate with nozzle holes is further divided into a multi-porous grate plate with nozzle holes and a grate plate with few holes with nozzle holes, the grate plate without nozzle holes is further divided into a multi-porous grate plate without nozzle holes and a grate plate without few holes without nozzle holes; the air hole opening rate of the grate plate with few holes in nozzle holes and the grate plate without few holes in nozzle holes is 3.25%; the air hole opening rate of the multi-porous grate plate with nozzle holes and the multi-porous grate plate without nozzle holes is 5.24%; multi-piece grate The plates are evenly installed on the supporting beam of the grate bracket through bolts in the bolt holes to form a grate. From the front side to the back side of the furnace, a row of grate plates with nozzle holes is installed behind every two rows of grate plates without nozzle holes. The first four rows of grate plates without nozzle holes are composed of multiple pieces of grate plates with few holes without nozzle holes, the first row of grate plates with nozzle holes is composed of multiple pieces of grate plates with few holes with nozzle holes, and the remaining rows of grate plates without nozzle holes and grate plates with nozzle holes are respectively composed of multiple pieces of multi-porous grate plates without nozzle holes and multi-porous grate plates with nozzle holes, and the distance between adjacent grate plates is 4 mm; a nozzle installation hole is opened in the middle of the top plate of the grate plate with nozzle holes, and a nozzle that can spray steam is installed in the nozzle installation hole, and the blowing direction of each nozzle is consistent and sprays along the grate surface.

[0045] The grate is lower in front and higher in the back, with an inclination of 8°.

[0046] The nozzle includes a nozzle head 21, which is semi-cylindrical; a flat nozzle 22 is arranged on one side of the semi-cylindrical nozzle head 21; a square cylinder limiting body 23 is arranged at the lower part of the nozzle head 21, a locking thread body 24 is arranged at the lower part of the square cylinder limiting body 23, and a steam pipe connecting body 26 is arranged at the lower part of the locking thread body 24; the diameter of the square cylinder limiting body 23 is smaller than the width of the nozzle head 21 and larger than the diameter of the locking thread body 24; a steam channel 25 is arranged in the square cylinder limiting body 23, the locking thread body 24 and the steam pipe connecting body 26, and the steam channel 25 passes through the bottom of the steam pipe connecting body 26 to the nozzle head 21 and is connected with the nozzle 22. The length of the square cylinder limiting body 23 is less than or equal to the depth of the square countersunk hole for installing the grate nozzle. The square cylinder limiting body 23 and the square countersunk hole for installing the grate nozzle are clearance matched. During installation, the nozzle is inserted into the square countersunk hole for installing the nozzle from the top of the grate. The nozzle head 21 is stuck on the grate surface, and the square cylinder limiting body 23 is extended into the square countersunk hole for installing the nozzle. Finally, the nozzle is fixed on the grate by the spring washer and nut installed on the locking threaded body 24; the steam pipe connecting body 26 is connected to the connecting pipe. Example

[0047] A steam slag blowing system for a bagasse boiler grate, comprising slag blowing nozzles 4, gas distribution pipes I5, gas distribution pipes II2 and a steam header 8; the number of the slag blowing nozzles 4 is multiple, evenly installed on the grate, and arranged in multiple rows from the front side to the rear side of the furnace; the gas distribution pipe I5 is installed below the grate at the bottom of the slag blowing nozzles 4 in the front row, and the slag blowing nozzles 4 in the front row are connected to the gas distribution pipes I5 through connecting pipes 3; the gas distribution pipes II2 are installed below the grate at the bottom between every two rows of slag blowing nozzles 4 except the front row, and there are two rows of slag blowing nozzles 4 between every two rows of gas distribution pipes II2, and the two sides of the gas distribution pipes II2 are connected to the slag blowing nozzles 4 on both sides thereof through connecting pipes 3, and each row of gas distribution pipes II2 provides steam for two rows of slag blowing nozzles 4; the gas distribution pipes I5 and the gas distribution pipes II2 are connected to the steam header 8 for steam supply through the gas transmission pipe 1 and the gas outlet valve 6 respectively.

[0048] The steam manifold 8 comprises a sealed pipe body, a bracket 9 is installed at the lower part of the pipe body, and a plurality of gas ports 7 are arranged on the pipe body, one of the gas ports 7 is connected to a vent pipe 11 for inputting steam into the steam manifold 8 through an air inlet valve 10, and the remaining gas ports 7 are connected to the gas distribution pipes through the gas pipe 1 and the air outlet valve 6.

[0049] A water delivery pipe 13 is provided at the lower part of the steam header 8, and a steam trap 12 is installed on the water delivery pipe 13.

[0050] The upper part of the gas distribution pipe Ⅰ5 is evenly provided with multiple gas distribution ports 19 connected to the connecting pipe, and the lower part is provided with a vent 20 connected to the gas supply pipe; the two sides of the gas distribution pipe Ⅱ2 are evenly provided with multiple gas distribution ports 19 connected to the connecting pipe, and the lower part is provided with a vent 20 connected to the gas supply pipe.

[0051] The grate comprises a grate plate, which is composed of a square top plate and side plates, and the side plates are mutually surrounded around the bottom of the top plate; the grate plate is integrally cast; a plurality of air holes with small upper part and large lower part and a bolt hole are vertically and evenly distributed on the top plate; the grate plate is divided into a grate plate with nozzle holes and a grate plate without nozzle holes, the grate plate with nozzle holes is further divided into a multi-porous grate plate with nozzle holes and a grate plate with few holes with nozzle holes, the grate plate without nozzle holes is further divided into a multi-porous grate plate without nozzle holes and a grate plate without few holes without nozzle holes; the air hole opening rate of the grate plate with few holes in nozzle holes and the grate plate without few holes in nozzle holes is 3.25%; the air hole opening rate of the multi-porous grate plate with nozzle holes and the multi-porous grate plate without nozzle holes is 5.24%; multi-piece grate The plates are evenly installed on the supporting beam of the grate bracket through bolts in the bolt holes to form a grate. From the front side to the back side of the furnace, a row of grate plates with nozzle holes is installed behind every two rows of grate plates without nozzle holes. The first four rows of grate plates without nozzle holes are composed of multiple pieces of grate plates with few holes without nozzle holes, the first row of grate plates with nozzle holes is composed of multiple pieces of grate plates with few holes with nozzle holes, and the remaining rows of grate plates without nozzle holes and grate plates with nozzle holes are respectively composed of multiple pieces of multi-porous grate plates without nozzle holes and multi-porous grate plates with nozzle holes, and the distance between adjacent grate plates is 4 mm; a nozzle installation hole is opened in the middle of the top plate of the grate plate with nozzle holes, and a nozzle that can spray steam is installed in the nozzle installation hole, and the blowing direction of each nozzle is consistent and sprays along the grate surface.

[0052] The grate is lower in front and higher in the back, with an inclination of 8°.

[0053] The nozzle includes a nozzle head 21, which is semi-cylindrical; a flat nozzle 22 is arranged on one side of the semi-cylindrical nozzle head 21; a square cylinder limiting body 23 is arranged at the lower part of the nozzle head 21, a locking thread body 24 is arranged at the lower part of the square cylinder limiting body 23, and a steam pipe connecting body 26 is arranged at the lower part of the locking thread body 24; the diameter of the square cylinder limiting body 23 is smaller than the width of the nozzle head 21 and larger than the diameter of the locking thread body 24; a steam channel 25 is arranged in the square cylinder limiting body 23, the locking thread body 24 and the steam pipe connecting body 26, and the steam channel 25 passes through the bottom of the steam pipe connecting body 26 to the nozzle head 21 and is connected with the nozzle 22. The length of the square cylinder limiting body 23 is less than or equal to the depth of the square countersunk hole for installing the grate nozzle. The square cylinder limiting body 23 and the square countersunk hole for installing the grate nozzle are clearance matched. During installation, the nozzle is inserted into the square countersunk hole for installing the nozzle from the top of the grate. The nozzle head 21 is stuck on the grate surface, and the square cylinder limiting body 23 is extended into the square countersunk hole for installing the nozzle. Finally, the nozzle is fixed on the grate by the spring washer and nut installed on the locking threaded body 24; the steam pipe connecting body 26 is connected to the connecting pipe.

[0054] The steam channel 25 is a circular steam channel, the aperture of which is smaller than the width of the nozzle 22 , and the steam channel 25 is connected to both sides of the nozzle 22 in a gradual transition.

[0055] The lower connecting surface of the nozzle 22 and the steam channel 25 is horizontal, and the upper connecting surface of the nozzle 22 and the steam channel 25 is inclined upward at an angle of 3-5 degrees, and is inclined upward toward the steam channel side, and the intersection with the steam channel 25 is an arc transition. The nozzle and the steam channel are arranged in this way, so that steam can be diffused and ejected from the nozzle, and the ejection is powerful, the ejection radiation surface is wide, and there is no dead angle.

[0056] The two ends and the edges and corners of the two sides of the described semi-cylindrical nozzle head 21 are polished and smooth. Because the grate in the boiler furnace occasionally needs manual scraping and raking, the nozzle head is arranged like this, and it is not easy to get stuck during manual scraping and raking. Example

[0057] A steam slag blowing system for a bagasse boiler grate, comprising slag blowing nozzles 4, gas distribution pipes I5, gas distribution pipes II2 and a steam header 8; the number of the slag blowing nozzles 4 is multiple, evenly installed on the grate, and arranged in multiple rows from the front side to the rear side of the furnace; the gas distribution pipe I5 is installed below the grate at the bottom of the slag blowing nozzles 4 in the front row, and the slag blowing nozzles 4 in the front row are connected to the gas distribution pipes I5 through connecting pipes 3; the gas distribution pipes II2 are installed below the grate at the bottom between every two rows of slag blowing nozzles 4 except the front row, and there are two rows of slag blowing nozzles 4 between every two rows of gas distribution pipes II2, and the two sides of the gas distribution pipes II2 are connected to the slag blowing nozzles 4 on both sides thereof through connecting pipes 3, and each row of gas distribution pipes II2 provides steam for two rows of slag blowing nozzles 4; the gas distribution pipes I5 and the gas distribution pipes II2 are connected to the steam header 8 for steam supply through the gas transmission pipe 1 and the gas outlet valve 6 respectively.

[0058] The steam manifold 8 comprises a sealed pipe body, a bracket 9 is installed at the lower part of the pipe body, and a plurality of gas ports 7 are arranged on the pipe body, one of the gas ports 7 is connected to a vent pipe 11 for inputting steam into the steam manifold 8 through an air inlet valve 10, and the remaining gas ports 7 are connected to the gas distribution pipes through the gas pipe 1 and the air outlet valve 6.

[0059] A water delivery pipe 13 is provided at the lower part of the steam header 8, and a steam trap 12 is installed on the water delivery pipe 13.

[0060] The steam header 8 is provided with a pressure test port 14 , on which a pressure gauge assembly is installed. The pressure gauge assembly includes a stop valve 15 , a pressure gauge elbow 16 , a stop valve 17 for the pressure gauge and a pressure gauge 18 .

[0061] The upper part of the gas distribution pipe Ⅰ5 is evenly provided with multiple gas distribution ports 19 connected to the connecting pipe, and the lower part is provided with a vent 20 connected to the gas supply pipe; the two sides of the gas distribution pipe Ⅱ2 are evenly provided with multiple gas distribution ports 19 connected to the connecting pipe, and the lower part is provided with a vent 20 connected to the gas supply pipe.

[0062] The grate comprises a grate plate, which is composed of a square top plate and side plates, and the side plates are mutually surrounded around the bottom of the top plate; the grate plate is integrally cast; a plurality of air holes with small upper part and large lower part and a bolt hole are vertically and evenly distributed on the top plate; the grate plate is divided into a grate plate with nozzle holes and a grate plate without nozzle holes, the grate plate with nozzle holes is further divided into a multi-porous grate plate with nozzle holes and a grate plate with few holes with nozzle holes, the grate plate without nozzle holes is further divided into a multi-porous grate plate without nozzle holes and a grate plate without few holes without nozzle holes; the air hole opening rate of the grate plate with few holes in nozzle holes and the grate plate without few holes in nozzle holes is 3.25%; the air hole opening rate of the multi-porous grate plate with nozzle holes and the multi-porous grate plate without nozzle holes is 5.24%; multi-piece grate The plates are evenly installed on the supporting beam of the grate bracket through bolts in the bolt holes to form a grate. From the front side to the back side of the furnace, a row of grate plates with nozzle holes is installed behind every two rows of grate plates without nozzle holes. The first four rows of grate plates without nozzle holes are composed of multiple pieces of grate plates with few holes without nozzle holes, the first row of grate plates with nozzle holes is composed of multiple pieces of grate plates with few holes with nozzle holes, and the remaining rows of grate plates without nozzle holes and grate plates with nozzle holes are respectively composed of multiple pieces of multi-porous grate plates without nozzle holes and multi-porous grate plates with nozzle holes, and the distance between adjacent grate plates is 4 mm; a nozzle installation hole is opened in the middle of the top plate of the grate plate with nozzle holes, and a nozzle that can spray steam is installed in the nozzle installation hole, and the blowing direction of each nozzle is consistent and sprays along the grate surface.

[0063] Taking a 120t / h boiler as an example, the grate is low in the front and high in the back, with an inclination of 8°; the grate width is 7600 mm, and the gaps between the two sides and the furnace wall are 2 mm each; the grate depth (inclined surface) is 6300 mm, and the gap between the front and the furnace wall is 4 mm; the length, width and height of the top plate are 376 mm, 296 mm and 18 mm respectively, the thickness of the side plate is 12 mm, and the distance between the bottom end of the side plate and the top surface of the top plate is 100 mm; the upper and lower diameters of the air holes that are small at the top and large at the bottom are 8 mm and 14 mm respectively; the upper part of the nozzle mounting hole is a 51 mm × 51 mm countersunk hole with a sinking depth of 10 mm, and the lower part is a through hole with a diameter of 43 mm; the upper part of the bolt hole is a countersunk hole with a diameter of 24 mm, with a sinking depth of 10 mm, and the lower part is a through hole with a diameter of 14 mm.

[0064] The nozzle includes a nozzle head 21, which is semi-cylindrical; a flat nozzle 22 is arranged on one side of the semi-cylindrical nozzle head 21; a square cylinder limiting body 23 is arranged at the lower part of the nozzle head 21, a locking thread body 24 is arranged at the lower part of the square cylinder limiting body 23, and a steam pipe connecting body 26 is arranged at the lower part of the locking thread body 24; the diameter of the square cylinder limiting body 23 is smaller than the width of the nozzle head 21 and larger than the diameter of the locking thread body 24; a steam channel 25 is arranged in the square cylinder limiting body 23, the locking thread body 24 and the steam pipe connecting body 26, and the steam channel 25 passes through the bottom of the steam pipe connecting body 26 to the nozzle head 21 and is connected with the nozzle 22. The length of the square cylinder limiting body 23 is less than or equal to the depth of the square countersunk hole for installing the grate nozzle. The square cylinder limiting body 23 and the square countersunk hole for installing the grate nozzle are clearance matched. During installation, the nozzle is inserted into the square countersunk hole for installing the nozzle from the top of the grate. The nozzle head 21 is stuck on the grate surface, and the square cylinder limiting body 23 is extended into the square countersunk hole for installing the nozzle. Finally, the nozzle is fixed on the grate by the spring washer and nut installed on the locking threaded body 24; the steam pipe connecting body 26 is connected to the connecting pipe.

[0065] The steam channel 25 is a circular steam channel, the aperture of which is smaller than the width of the nozzle 22 , and the steam channel 25 is connected to both sides of the nozzle 22 in a gradual transition.

[0066] The lower connecting surface of the nozzle 22 and the steam channel 25 is horizontal, and the upper connecting surface of the nozzle 22 and the steam channel 25 is inclined upward at an angle of 3-5 degrees, and is inclined upward toward the steam channel side, and the intersection with the steam channel 25 is an arc transition. The nozzle and the steam channel are arranged in this way, so that steam can be diffused and ejected from the nozzle, and the ejection is powerful, the ejection radiation surface is wide, and there is no dead angle.

[0067] The two ends and the edges and corners of the two sides of the described semi-cylindrical nozzle head 21 are polished and smooth. Because the grate in the boiler furnace occasionally needs manual scraping and raking, the nozzle head is arranged like this, and it is not easy to get stuck during manual scraping and raking. Example

[0068] 1. A company in Guangxi tried to install this steam slag blowing system in a 120-ton boiler of a sugar factory in Thailand. It uses saturated steam with a working pressure of 2.45Mpa. The required steam is directly drawn from the auxiliary steam pipe of the drum and enters the steam header after passing through the pressure reducing valve. The boiler has been used for two consecutive crushing seasons. The air holes of the grate have not been blocked, and there is almost no coking on the grate surface. The steam production is stable and the thermal efficiency is high.

[0069] The above description is not a limitation of the present application, and the present application is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this field within the essential scope of the present application should fall within the scope of protection of the present application.

Claims

1. A steam slag blowing system for a bagasse boiler grate, characterized in that: The invention comprises a slag blowing nozzle (4), an air distribution pipe I (5), an air distribution pipe II (2) and a steam header (8); the slag blowing nozzles (4) are in multiple numbers and are evenly installed on the grate and arranged in multiple rows from the front side of the furnace to the rear side of the furnace; the grate comprises a grate plate, which is composed of a square top plate and side plates, and the side plates are mutually surrounded around the bottom of the top plate; the grate plate is integrally cast; a plurality of air holes with small upper holes and large lower holes are evenly distributed vertically on the top plate and a screw Bolt hole; grate slices are divided into grate slices with nozzle holes and grate slices without nozzle holes. Grate slices with nozzle holes are further divided into grate slices with multiple holes with nozzle holes and grate slices with fewer holes with nozzle holes. Grate slices without nozzle holes are further divided into grate slices without multiple holes with nozzle holes and grate slices without fewer holes with nozzle holes. The air hole opening rate of grate slices with fewer holes with nozzle holes and grate slices without fewer holes with nozzle holes is 3.25%; the air hole opening rate of grate slices with multiple holes with nozzle holes and grate slices without multiple holes with nozzle holes is 5.24%; multiple grate slices are evenly installed on the supporting beam of the grate bracket through bolts in the bolt holes to form a grate. From the front side of the furnace to the back side of the furnace, a row of grate slices with nozzle holes is installed behind every two rows of grate slices without nozzle holes. The first four rows of grate slices without nozzle holes are composed of multiple grate slices without nozzle holes and few holes. The first row of grate slices with nozzle holes is composed of multiple grate slices with nozzle holes and few holes. The remaining rows of grate slices without nozzle holes and grate slices with nozzle holes are respectively composed of multiple porous grate slices without nozzle holes and porous grate slices with nozzle holes. The distance between adjacent grate slices is 4 mm. A nozzle mounting hole is opened in the middle of the top plate of the grate slice with nozzle holes. A nozzle that can spray steam is installed in the nozzle mounting hole. The blowing direction of each nozzle is consistent and along the grate. The grate is low in front and high in the back, with an inclination of 8°; the length, width and height of the top plate are 376 mm, 296 mm and 18 mm respectively, the thickness of the side plate is 12 mm, and the distance between the bottom end of the side plate and the top surface of the top plate is 100 mm; the upper and lower diameters of the wind holes, which are small at the top and large at the bottom, are 8 mm and 14 mm respectively; the air distribution pipe I (5) is installed below the grate at the bottom of the front row of slag blowing nozzles (4), and the front row of slag blowing nozzles (4) are connected to the air distribution pipe I (5) through the connecting pipe (3); the air distribution pipe II (2) is installed below the grate at the bottom between every two rows of slag blowing nozzles (4) except the front row of slag blowing nozzles (4), and there are two rows of slag blowing nozzles between every two rows of air distribution pipe II (2). (4), the two sides of the gas distribution pipe II (2) are respectively connected to the slag blowing nozzles (4) on both sides thereof through the connecting pipes (3), and each row of the gas distribution pipe II (2) provides steam for two rows of slag blowing nozzles (4); the gas distribution pipe I (5) and the gas distribution pipe II (2) are respectively connected to the steam header (8) for supplying steam through the gas transmission pipe (1) and the gas outlet valve (6); the steam header (8) comprises a sealed pipe body, a bracket (9) is installed at the lower part of the pipe body, and a plurality of gas transmission ports (7) are arranged on the pipe body, one of the gas transmission ports (7) is connected to the ventilation pipe (11) for inputting steam to the steam header (8) through the gas inlet valve (10), and the remaining gas transmission ports (7) are connected to the gas distribution pipes through the gas transmission pipe (1) and the gas outlet valve (6); the steam header A water delivery pipe (13) is arranged at the lower part of the pipe (8), and a steam trap (12) is installed on the water delivery pipe (13); a pressure test port (14) is arranged on the steam header (8), and a pressure gauge assembly is installed on the pressure test port (14), and the pressure gauge assembly includes a stop valve (15), a pressure gauge elbow (16), a stop valve for the pressure gauge (17) and a pressure gauge (18); a plurality of gas distribution ports (19) connected to the connecting pipe are evenly arranged on the upper part of the gas distribution pipe I (5), and a vent (20) connected to the gas delivery pipe is arranged at the lower part; a plurality of gas distribution ports (19) connected to the connecting pipe are evenly arranged on both sides of the gas distribution pipe II (2), and a vent (20) connected to the gas delivery pipe is arranged at the lower part. .

2. The steam slag blowing system for bagasse boiler grate according to claim 1 is characterized in that: The slag blowing nozzle (4) comprises a nozzle head (21), the nozzle head (21) is semi-cylindrical; a flat nozzle (22) is arranged on one side of the semi-cylindrical nozzle head (21); a square cylinder limiting body (23) is arranged at the bottom of the nozzle head (21), a locking thread body (24) is arranged at the bottom of the square cylinder limiting body (23), and a steam pipe connecting body (26) is arranged at the bottom of the locking thread body (24); the diameter of the square cylinder limiting body (23) is smaller than the width of the nozzle head (21) and larger than the diameter of the locking thread body (24); a steam channel (25) is arranged inside the square cylinder limiting body (23), the locking thread body (24) and the steam pipe connecting body (26); the steam channel (25) passes through from the bottom of the steam pipe connecting body (26) to the nozzle head (21) and is connected to the nozzle (22).

3. The steam slag blowing system for bagasse boiler grate according to claim 2 is characterized in that: The steam channel (25) is a circular steam channel, the aperture of which is smaller than the width of the nozzle (22), and the steam channel (25) is connected to the nozzle (22) at both sides in a gradual transition.

4. The steam slag blowing system for bagasse boiler grate according to claim 2 is characterized in that: The lower connecting surface of the nozzle (22) and the steam channel (25) is horizontal, and the upper connecting surface of the nozzle (22) and the steam channel (25) is inclined upward at an angle of 3-5 degrees, and is inclined upward toward the steam channel side, and the intersection with the steam channel (25) is an arc transition.

5. The steam slag blowing system for bagasse boiler grate according to claim 2, characterized in that: The edges and corners of both ends and both sides of the semi-cylindrical nozzle head (21) are polished smooth.

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