A casing-tube direct-flow natural gas boiler

Abstract

The present invention relates to a casing direct current natural gas boiler. A pressure gauge monitors the steam pressure in real time, and a safety valve and a pressure controller are used to control the boiler load, thereby realizing fully automatic regulation of the boiler load. When the steam is over-pressured due to an abnormal situation such as a failure in external steam supply, the power is immediately cut off and the boiler is stopped through the pressure controller, and an audible and visual alarm is issued at the same time. During the control protection action, the safety valve is opened, the steam is exhausted and the pressure is relieved, and a magnetic flap liquid level gauge monitors the water level in real time. When the water level is lower than a low water level line due to an abnormal situation such as a failure in a water supply pump, an audible and visual alarm is first issued. When the water level is at the lowest safe water level line, the power is immediately cut off and the boiler is stopped, and an audible and visual alarm is issued at the same time. When the water level in the boiler drum is high, the protection action is the same as above. When the limit low water level is reached, the boiler is immediately stopped and locked, thereby completely eliminating water shortage accidents caused by false water level in the boiler. The boiler has a high level of automatic control and is equipped with complete safety protection devices, so that the operation of the boiler is simple, the operation is safe and reliable, and water supply and operation can be realized fully automatically.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler equipment, and in particular to a casing-tube once-through natural gas boiler. Background Art

[0002] The boiler uses fuel combustion, which has low thermal efficiency and produces a large amount of smoke, which does not meet environmental protection requirements. In addition, the overall size is large, it occupies a large area, and it is time-consuming and labor-intensive to transport and install. It cannot automatically control the start and stop of heating, resulting in the inability to freely adjust the boiler load, which poses a major safety hazard. Summary of the Invention

[0003] The purpose of the present invention is to provide a double-tube once-through natural gas boiler to solve the above-mentioned problems existing in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] A casing-tube once-through natural gas boiler comprises a boiler body, and pipelines, valves, instruments, and a natural gas burner mounted on the boiler body. The boiler body is provided with an outer insulation layer. A normal pressure economizer is fixedly connected to the right side of the top of the boiler body, and a chimney is fixedly connected to the top of the normal pressure economizer.

[0006] The boiler body includes a lower cylinder section and an upper cylinder section. The top and bottom of the upper cylinder section are fixedly connected to the top plate and the tube sheet two respectively. The interior of the upper cylinder section is fixedly connected to the tube sheet one. The top of the lower cylinder section is fixedly connected to the tube sheet four and the tube sheet three. The tube sheet four is located below the tube sheet three. The bottom of the lower cylinder section is fixedly connected to the bottom plate. The center of the upper cylinder section is fixedly connected to the inner cylinder body. The inner cylinder body passes through the top plate, the tube sheet one and the tube sheet two. The outer side of the upper cylinder section is fixedly connected to the safety valve pipe seat, the pressure gauge pipe seat, the drain pipe seat, the main steam pipe seat and the liquid level gauge pipe seat. The outer side of the lower cylinder section is fixedly connected to the water supply pipe seat and the inspection pipe seat. The water supply pipe seat and the inspection pipe seat are both connected between the tube sheet three and the tube sheet four. A threaded smoke tube and a straight smoke tube are fixedly connected between the tube sheet one and the tube sheet four, the two ends of the threaded smoke tube and the straight smoke tube are connected, and electric heating wires are installed on the outer walls of the threaded smoke tube and the straight smoke tube. The threaded smoke tube is located in a circular distribution outside the straight smoke tube. A steel pipe one is fixedly connected between the tube sheet two and the tube sheet three, and a sealing plate one is fixedly connected between the outermost steel pipes one. The threaded smoke tube and the straight smoke tube are both located in the steel pipe one and pass through the steel pipe one. A steel pipe two is fixedly connected between the tube sheet three and the tube sheet four, and the two ends of the steel pipe two are connected. A steam-water separator is provided between the tube sheet one and the tube sheet two. The right side wall of the upper cylinder section is fixedly connected with a smoke outlet, and the smoke outlet is located between the tube sheet one and the top plate.

[0007] The pipeline valve instrument includes a circulation pump, a fully automatic water softening device, a water tank, and a stop valve 1 installed on the main steam pipe seat and a stop valve 2 installed on the drain pipe seat. The top of the pressure gauge pipe seat is fixedly connected to a pressure gauge seat, and the pressure gauge seat is fixedly connected to a water trap. Two three-way valves are installed on the water trap and are connected to a pressure gauge through the three-way valve. A pressure controller is fixedly connected to the water trap. A right-angle elbow is fixedly connected between the flue gas outlet and the normal pressure energy saver. A vertical partition is provided inside the water tank to divide it into a cold water area and a hot water area. The input and output ends of the circulation pump are respectively connected to the cold water area of ​​the water tank and the normal pressure energy saver. The fully automatic water softening device and the The normal pressure energy saver is respectively connected to the cold water area and the hot water area of ​​the water tank, and the hot water area of ​​the water tank is connected to the water supply pipe seat. The water tank and the water supply pipe seat are connected in sequence with a Y-type filter, a water flow meter, a stop valve five, a water pump and a check valve. A liquid level gauge connecting pipe is connected between the left outer walls of the upper cylinder section and the lower cylinder section. The lower end of the liquid level gauge connecting pipe is connected to the liquid level gauge pipe seat. The side of the liquid level gauge connecting pipe is fixedly connected with a magnetic flap liquid level gauge. The liquid level gauge connecting pipe and the upper and lower ends of the magnetic flap liquid level gauge are both connected with a stop valve three. The bottom end of the magnetic flap liquid level gauge is fixedly connected with a stop valve four. The bottom end of the liquid level gauge connecting pipe is fixedly connected with a gate valve and a drain valve in series in sequence.

[0008] The beneficial effects of the present invention are as follows: after being treated in the fully automatic water softening device, water enters the cold water area in the water tank, the water supply pump draws water to the water supply pipe seat, enters between tube sheet three and tube sheet four of the boiler body, and fills between steel pipe one and the threaded smoke pipe, and between steel pipe one and the straight smoke pipe. The water supply flow meter counts the water flow, and the magnetic flap level gauge monitors the water level. After reaching the preset water level, the natural gas burner starts to work and burns natural gas to generate heat. Steam after the water boils is output from the main steam pipe seat. When the steam passes through the steam-water separator, some of the water that is not completely vaporized flows back into steel pipe one. The airflow between steel pipe one and the threaded smoke pipe, and between steel pipe one and the straight smoke pipe, carries heat and surges upward, and is output from the main steam pipe seat to the user end. The circulating pump draws water from the cold water area of ​​the water tank into the normal pressure economizer. The cold water absorbs the heat in the airflow and flows to the hot water area of ​​the water tank. The water in the hot water area of ​​the water tank is then drawn into the boiler body by the water supply pump. The natural gas burner burns natural gas to generate heat, which passes through the inner cylinder into the outside of steel pipe one and then passes through the inside of steel pipe two to transfer the heat downward to the insulation layer in the lower smoke chamber. The heat then passes through the threaded smoke pipe and the straight smoke pipe into the smoke outlet and is discharged from the chimney after passing through the normal pressure economizer, thereby improving heat utilization and steam efficiency.

[0009] The pressure gauge monitors the steam pressure in real time, and the boiler load is controlled by the safety valve and pressure controller. The heating intensity of the pressure controller is used to realize fully automatic adjustment of the boiler load. When the steam is over-pressured due to abnormal conditions such as external steam supply failure, the power is immediately cut off and the furnace is stopped through the pressure controller, and an audible and visual alarm is issued. The safety valve is opened and the steam is discharged to relieve the pressure while the protection action is controlled. The magnetic flap liquid level gauge monitors the water level in real time. When the water level is low, the water pump is automatically started. When the water level is high, the water pump automatically stops. When the water level is below the low water level line due to abnormal conditions such as water supply pump failure, an audible and visual alarm is first issued. When the water level is at the lowest safe water level line, the power is immediately cut off and the furnace is stopped, and an audible and visual alarm is issued. When the water level in the boiler drum is high, the protection action is the same as above. When the limit low water level is reached, the furnace is immediately stopped and locked, completely eliminating the water shortage accident caused by the false water level of the boiler. The high level of automatic control and complete safety protection devices make the furnace easy to operate, safe and reliable in operation, and can realize full automatic water supply and operation.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the steam-water separator includes a fan-shaped bottom plate, the top of the fan-shaped bottom plate is fixedly connected to a plurality of side hole plates, the side surfaces of the side hole plates are provided with evenly distributed holes, and arc plates are fixedly connected between adjacent side hole plates, and the arc plates are provided with a plurality of water leakage holes.

[0012] Furthermore, the liquid level gauge connecting pipe includes a steel pipe three, both ends of which are fixedly connected with an elbow one, and three equal-diameter tees are fixedly connected to the steel pipe three, and the three equal-diameter tees are respectively connected to the liquid level gauge pipe seat and two stop valves three.

[0013] Furthermore, the outer insulation layer of the boiler includes angle irons fixed to the outer walls of the upper and lower cylinder sections, flat steels are fixedly connected between the outer walls of the angle irons, the outer walls of the flat steels are covered with thin plates, the flat steels and the thin plates are fixed with blind aluminum rivets, the top of the thin plates are fixedly connected with a top guard plate, and insulation cotton is filled between the flat steels and the upper and lower cylinder sections.

[0014] Furthermore, the normal pressure economizer includes a cylindrical outer plate, a condenser is fixedly connected to the inner center of the outer plate, two symmetrical round and square holes are fixedly connected to the inner part of the outer plate, and the two round and square holes are respectively located above and below the condenser, the outer wall of the outer plate is filled with thermal insulation cotton, and the condenser is provided with a water inlet and a water outlet.

[0015] Furthermore, a rib plate is fixedly connected between the outer wall of the lower cylinder section and the bottom plate, and a lifting lug is fixedly connected to the top of the top plate.

[0016] Furthermore, a sealing plate 2 is fixedly connected between two adjacent steel pipes 1 on the outermost side, and a fire viewing tube is fixedly connected to the outer wall of the sealing plate 2, and the fire viewing tube is inclined upward.

[0017] Furthermore, a temperature measuring port is provided on the outer wall of the upper cylinder section, and the temperature measuring port is located at an upper position between the tube sheet one and the tube sheet two; the inner wall of the lower cylinder section is fitted with a lower smoke chamber insulation layer, and a furnace sealing layer is fixedly connected between the tube sheet three and the threaded smoke pipe and the sealing plate one.

[0018] Furthermore, an inspection door is fixedly connected to the outer wall of the lower cylinder section, and the inspection door passes through the outer wall of the lower cylinder section; a thermocouple 1 is fixed to the top inner wall of the normal pressure economizer, and a thermocouple 2 is fixed between the water flow meter and the Y-type filter.

[0019] Furthermore, the top of the water tank is connected to a vent elbow directly leading to the atmosphere, and the hot water area of ​​the water tank is provided with a dosing port and a sampling port. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall assembly of the present invention;

[0021] Figure 2 This is a schematic diagram of the boiler body structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the right side view of the boiler body of the present invention;

[0023] Figure 4 This is a cross-sectional view of the boiler body of the present invention;

[0024] Figure 5 for Figure 4 A cross-sectional view of the tube sheet at AA in the middle;

[0025] Figure 6 for Figure 4 The second cross-section of the tube sheet at the middle BB;

[0026] Figure 7 for Figure 4 Three cross-sectional views of the tube sheet at CC;

[0027] Figure 8 for Figure 4 Four cross-sectional views of the tube sheet at the middle DD;

[0028] Figure 9 Schematic diagram of the structure of the steam-water separator of the present invention;

[0029] Figure 10 It is a cross-sectional view of the steam-water separator of the present invention;

[0030] Figure 11 This is a schematic diagram of the pipeline valve instrument connection of the present invention;

[0031] Figure 12 This is a right side view of the pipeline valve instrument of the present invention;

[0032] Figure 13 This is a schematic diagram of the structure of the connecting pipe of the liquid level gauge of the present invention;

[0033] Figure 14 This is a schematic diagram of the outer insulation layer structure of the boiler of the present invention;

[0034] Figure 15 This is a structural diagram of the atmospheric pressure energy saver of the present invention;

[0035] Figure 16 This is a right side view of the normal pressure energy saver of the present invention;

[0036] Figure 17 This is a top view of the normal pressure energy saver of the present invention.

[0037] In the figure: 1. Boiler body; 2. Pipeline valves and instruments; 3. Boiler outer insulation layer; 4. Atmospheric pressure economizer; 5. Chimney; 6. Natural gas burner;

[0038] 11. Bottom plate; 12. Rib plate; 13. Lower tube section; 14. Tube sheet four; 15. Tube sheet three; 16. Tube sheet two; 17. Tube sheet one; 18. Upper tube section; 19. Top plate; 110. Lifting lug; 111. Safety valve seat; 112. Inner tube; 113. Pressure gauge seat; 114. Drain seat; 115. Temperature measuring port; 116. Main steam pipe seat; 117. Level gauge seat; 118. Inspection door; 119 120, Inspection pipe seat; 121, Insulation layer in lower smoke chamber; 122, Furnace sealing layer; 123, Steel pipe 1; 124, Threaded smoke pipe; 125, Straight smoke pipe; 126, Steam-water separator; 1261, Sector bottom plate; 1262, Side hole plate; 1263, Curved plate; 127, Fire observation tube; 128, Steel pipe 2; 129, Sealing plate 1; 130, Sealing plate 2; 131, Flue gas outlet;

[0039] 21. Stop valve one; 22. Stop valve two; 23. Safety valve; 24. Pressure gauge holder; 25. Trap; 26. Three-way valve; 27. Pressure gauge; 28. Pressure controller; 29. ​​Thermocouple one; 210. Right-angle elbow; 211. Circulating pump; 212. Liquid level gauge connecting pipe; 2121. Steel pipe three; 2122. Elbow one; 2123. Equal-diameter tee; 213. Stop valve three; 214. Magnetic flap level gauge; 215. Stop valve four; 216. Automatic water softener; 217. Water tank; 218. Y-type filter; 219. Stop valve five; 220. Water pump; 221. Check valve; 222. Gate valve; 223. Blowdown valve; 224. Water flowmeter; 225. Thermocouple two.

[0040] 31. Angle iron; 32. Flat steel; 33. Thin plate; 34. Insulation cotton; 35. Blind aluminum rivets; 36. Top guard plate;

[0041] 41. Condenser; 42. Round Heaven and Square Earth; 43. Insulation Coat 2; 44. Outer Panel; 45. Water Inlet; 46. Water Outlet. DETAILED DESCRIPTION

[0042] The principles and features of the present invention are described below with reference to 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.

[0043] Example 1, as Figure 1-17 As shown, a casing-tube once-through natural gas boiler includes a boiler body 1, a pipeline valve instrument 2, and a natural gas burner 6 installed on the boiler body 1. The outside of the boiler body 1 is provided with a boiler outer insulation layer 3. A normal pressure economizer 4 is fixedly connected to the top right side of the boiler body 1, and a chimney 5 is fixedly connected to the top of the normal pressure economizer 4.

[0044] The boiler body 1 includes a lower barrel section 13 and an upper barrel section 18. The top and bottom of the upper barrel section 18 are fixedly connected to the top plate 19 and the second tube sheet 16 respectively. The interior of the upper barrel section 18 is fixedly connected to the first tube sheet 17. The top of the lower barrel section 13 is fixedly connected to the fourth tube sheet 14 and the third tube sheet 15. The fourth tube sheet 14 is located below the third tube sheet 15. The bottom of the lower barrel section 13 is fixedly connected to the bottom plate 11. The center of the upper barrel section 18 is fixedly connected to the inner barrel 112. The inner cylinder 112 passes through the top plate 19, tube sheet 1 17 and tube sheet 2 16. The outer side of the upper cylinder section 18 is fixedly connected with the safety valve pipe seat 111, pressure gauge pipe seat 113, drain pipe seat 114, main steam pipe seat 116 and liquid level gauge pipe seat 117. The outer side of the lower cylinder section 13 is fixedly connected with the water supply pipe seat 119 and the inspection pipe seat 120. The water supply pipe seat 119 and the inspection pipe seat 120 are both connected between the tube sheet 3 15 and the tube sheet 4 14. A threaded smoke pipe 124 and a straight smoke pipe 125 are fixedly connected between the tube sheet 17 and the tube sheet 4 14. The two ends of the threaded smoke pipe 124 and the straight smoke pipe 125 are connected. The outer walls of the threaded smoke pipe 124 and the straight smoke pipe 125 are installed with electric heating wires. The threaded smoke pipe 124 is located in a circular distribution outside the straight smoke pipe 125. A steel pipe 123 is fixedly connected between the tube sheet 2 16 and the tube sheet 3 15. The outermost steel pipes 123 are fixedly connected with sealing members. Plate 129, threaded smoke pipe 124, and straight smoke pipe 125 are all located within and penetrate steel pipe 123. Steel pipe 2 128 is fixedly connected between tube sheet 3 15 and tube sheet 4 14, with both ends of steel pipe 2 128 connected. A steam-water separator 126 is provided between tube sheet 17 and tube sheet 2 16. A flue gas outlet 131 is fixedly connected to the right side wall of the upper cylinder section 18, and is located between tube sheet 17 and the top plate 19.

[0045] The pipeline valve instrument 2 includes a circulation pump 211, a fully automatic water softening device 216, a water tank 217, a stop valve 1 21 installed on the main steam pipe seat 116, and a stop valve 2 22 installed on the drain pipe seat 114. The top of the pressure gauge pipe seat 113 is fixedly connected to a pressure gauge seat 24, and the pressure gauge seat 24 is fixedly connected to a water trap 25. Two three-way valves 26 are installed on the water trap 25 and are connected to a pressure gauge 27 through the three-way valve 26. A pressure controller 28 is fixedly connected to the water trap 25. A right-angle elbow 210 is fixedly connected between the flue gas outlet 131 and the normal pressure energy saver 4. A vertical partition is provided inside the water tank 217 to divide it into a cold water area and a hot water area. The input and output ends of the circulation pump 211 are connected to the cold water area of ​​the water tank 217 and the normal pressure energy saver 4 respectively. The fully automatic water softening device 216 and the normal pressure energy saver 4 are divided into The water tank 217 is connected to the cold water area and the hot water area of ​​the water tank 217 respectively. The hot water area of ​​the water tank 217 is connected to the water supply pipe seat 119. The water tank 217 and the water supply pipe seat 119 are connected in sequence with a Y-type filter 218, a water flow meter 224, a stop valve five 219, a water pump 220 and a check valve 221. The left outer walls of the upper cylinder section 18 and the lower cylinder section 13 are connected with a liquid level gauge connecting pipe 212. The lower end of the liquid level gauge connecting pipe 212 is connected to the liquid level gauge pipe seat 117. The side of the liquid level gauge connecting pipe 212 is fixedly connected with a magnetic flap liquid level gauge 214. The liquid level gauge connecting pipe 212 and the upper and lower ends of the magnetic flap liquid level gauge 214 are both connected with a stop valve three 213. The bottom end of the magnetic flap liquid level gauge 214 is fixedly connected with a stop valve four 215. The bottom end of the liquid level gauge connecting pipe 212 is fixedly connected with a gate valve 222 and a drain valve 223 in series.

[0046] After being treated in the fully automatic water softening device 216, the water enters the cold water area in the water tank 217. The water supply pump 220 pumps the water to the water supply pipe seat 119, enters between the tube sheet three 15 and the tube sheet four 14 of the boiler body 1, and fills the space between the steel pipe 123 and the threaded smoke pipe 124 and between the steel pipe 123 and the straight smoke pipe 125. The water supply flow meter 224 counts the water flow, and the magnetic flap level gauge 214 monitors the water level. After reaching the preset water level, the natural gas burner 6 starts to work and burns natural gas to generate heat. The steam after the water boils is output from the main steam pipe seat 116. When the steam passes through the steam-water separator 126, some of the water that is not completely vaporized flows back into the steel pipe 123. The airflow between the steel pipe 123 and the threaded smoke pipe 124 and between the steel pipe 123 and the straight smoke pipe 125 carries the heat and surges upward, and is output from the main steam pipe seat 116 to the user end. Circulation pump 211 draws water from the cold water area of ​​water tank 217 into the atmospheric pressure economizer 4. The cold water absorbs heat from the airflow and flows to the hot water area of ​​water tank 217. The water in this area is then pumped into boiler body 1 by feedwater pump 220. Natural gas burner 6 generates heat by burning natural gas, which passes through inner cylinder 112 and into steel pipe 1 123. Then, it passes through steel pipe 2 128 and transfers the heat downward to insulation layer 121 in the lower smoke chamber. The heat then passes through threaded smoke pipe 124 and straight smoke pipe 125, into smoke outlet 131, and after passing through atmospheric pressure economizer 4, is discharged from chimney 5, improving heat utilization and steam efficiency.

[0047] The pressure gauge 27 monitors the steam pressure in real time, and the safety valve 23 and the pressure controller 28 are used to control the boiler load. The heating intensity of the pressure controller 28 is used to realize fully automatic adjustment of the boiler load. When the steam is over-pressured due to abnormal conditions such as external steam supply failure, the power is immediately cut off and the furnace is stopped through the pressure controller 28, and an audible and visual alarm is issued at the same time. While controlling the protection action, the safety valve 23 is opened to exhaust the steam and relieve the pressure. The magnetic flap liquid level gauge 214 monitors the water level in real time. When the water level is low, the water pump is automatically started, and when the water level is high, the water pump is automatically stopped. When the water level is below the low water level line due to abnormal conditions such as water supply pump failure, an audible and visual alarm is first issued. When the water level is at the lowest safe water level line, the power is immediately cut off and the furnace is stopped, and an audible and visual alarm is issued at the same time. When the boiler water level is high, the protection action is the same as above. When the limit low water level is reached, the furnace is immediately stopped and locked, completely eliminating the water shortage accident caused by the false water level of the boiler. The high level of automatic control and complete safety protection devices make the furnace easy to operate, safe and reliable in operation, and can realize full automatic water supply and operation.

[0048] Example 2, as Figure 4 、 Figure 9 and Figure 10 As shown, this embodiment is a further improvement based on Example 1, and its details are as follows:

[0049] The steam-water separator 126 includes a fan-shaped bottom plate 1261, and a plurality of side hole plates 1262 are fixedly connected to the top of the fan-shaped bottom plate 1261. The sides of the side hole plates 1262 are provided with evenly distributed holes. An arc plate 1263 is fixedly connected between adjacent side hole plates 1262, and a plurality of water leakage holes are provided on the arc plate 1263.

[0050] When the steam enters the steam-water separator 126, the water that is not completely vaporized will adhere to the side hole plate 1262 and flow back downward to ensure the steam quantity.

[0051] Example 3, as Figure 11-13 As shown, this embodiment is a further improvement based on any one of Embodiments 1 to 2, and its details are as follows:

[0052] The liquid level gauge connecting pipe 212 includes a steel pipe 3 2121, both ends of which are fixedly connected to an elbow 1 2122. The steel pipe 3 2121 is fixedly connected to three equal-diameter tees 2123, which are respectively connected to the liquid level gauge pipe seat 117 and the two stop valves 3 213.

[0053] The steel pipe 3 2121 is connected to the upper and lower ends of the magnetic flap level gauge 214 through two equal-diameter tees 2123, which can accurately monitor the liquid level. The stop valve 3 213 can be used to replace and repair the magnetic flap level gauge 214 without affecting the normal operation of the boiler.

[0054] Example 4, as Figure 1 and Figure 14 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 3, and its details are as follows:

[0055] The boiler outer insulation layer 3 includes an angle iron 31 fixed to the outer walls of the upper cylinder section 18 and the lower cylinder section 13. Flat steel 32 is fixedly connected between the outer walls of the angle iron 31. The outer wall of the flat steel 32 is covered with a thin plate 33. The flat steel 32 and the thin plate 33 are fixed with blind aluminum rivets 35. The top of the thin plate 33 is fixedly connected with a top guard plate 36. Insulation cotton 34 is filled between the flat steel 32 and the upper cylinder section 18 and the lower cylinder section 13.

[0056] Angle iron 31 is used to fix flat steel 32 and thin plate 33 to the outer wall of upper cylinder section 18 and lower cylinder section 13, and thermal insulation cotton 34 is used to insulate the boiler and reduce heat loss.

[0057] Example 5, as Figure 15-17 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 4, and its details are as follows:

[0058] The atmospheric economizer 4 includes a cylindrical outer plate 44, and a condenser 41 is fixedly connected to the center of the inner part of the outer plate 44. Two symmetrical round and square holes 42 are fixedly connected to the inner part of the outer plate 44. The two round and square holes 42 are respectively located above and below the condenser 41. The outer wall of the outer plate 44 is filled with thermal insulation cotton 43, and the condenser 41 is provided with a water inlet 45 and a water outlet 46.

[0059] Cold water enters the condenser 41 from the water inlet 45 and flows out from the water outlet 46 after absorbing heat, fully absorbing heat, and the thermal insulation cotton 43 reduces heat loss and ensures heat utilization.

[0060] Example 6, as Figure 2 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 5, and its details are as follows:

[0061] A rib plate 12 is fixedly connected between the outer wall of the lower cylinder section 13 and the bottom plate 11. The rib plate 12 can improve the connection stability between the bottom plate 11 and the lower cylinder section 13. A lifting lug 110 is fixedly connected to the top of the top plate 19. The lifting lug 110 facilitates the lifting of the boiler.

[0062] Example 7, as Figure 3 and Figure 7 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 6, and its details are as follows:

[0063] A sealing plate 2 130 is fixedly connected between two adjacent steel pipes 123 on the outermost side, and a fire observation tube 127 is fixedly connected to the outer wall of the sealing plate 2 130. The fire observation tube 127 is tilted upward, and the fire observation tube 127 is convenient for observing the heating condition inside the boiler.

[0064] Example 8, as Figure 3 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 7, and its details are as follows:

[0065] A temperature measuring port 115 is provided on the outer wall of the upper cylinder section 18 . The temperature measuring port 115 is located slightly above the tube sheet 17 and the tube sheet 2 16 . The steam temperature can be measured at the temperature measuring port 115 .

[0066] Example 9, as Figure 4 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 8, and its details are as follows:

[0067] The inner wall of the lower cylinder section 13 is fitted with a lower smoke chamber insulation layer 121, and a furnace sealing layer 122 is fixedly connected between the tube plate three 15, the threaded smoke pipe 124 and the sealing plate one 129. The lower smoke chamber insulation layer 121 and the boiler outer insulation layer 3 jointly insulate the boiler to reduce heat loss.

[0068] Example 10, as Figure 1-3 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 9, and its details are as follows:

[0069] An inspection door 118 is fixedly connected to the outer wall of the lower cylinder section 13. The inspection door 118 passes through the outer wall of the lower cylinder section 13. The situation inside the lower cylinder section 13 can be detected through the inspection door 118, and fuel can be added through the inspection door 118 for combustion and heating.

[0070] Example 11, as Figure 11 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 10, and its details are as follows:

[0071] A thermocouple 29 is fixed to the top inner wall of the normal pressure economizer 4, and a thermocouple 225 is fixed between the water flow meter 224 and the Y-type filter 218. The temperature of the water outlet of the normal pressure economizer 4 and the water tank 217 is monitored by thermocouple 1 29 and thermocouple 2 225 respectively, and the heat loss can be calculated to make heating adjustments.

[0072] Example 12, as Figure 11 As shown, this embodiment is a further improvement based on any one of embodiments 1 to 11, and its details are as follows:

[0073] The top of the water tank 217 is connected to a vent elbow directly to the atmosphere, and the hot water area of ​​the water tank 217 is provided with a dosing port and a sampling port.

[0074] Prepare the medicine for boiling the furnace into a uniform solution with a concentration of 20%, inject it from the dosing port to the full water level, and boil the furnace at a pressure between 0.05MPa and 0.4MPa. When the pressure reaches 0.4MPa, the electric heating tube should be turned off. When the pressure drops to 0.05MPa, turn on the heating tube again, repeatedly raise and lower the pressure, and maintain it for 12 hours. Check the boiler water. Take water samples from the sampling port every 3 to 4 hours during the boiling period, analyze the boiler water alkalinity (total alkalinity) and phosphate content. When the alkalinity is lower than 45 mm equivalent / L or the phosphate is lower than 500 mg / L, add alkali solution until the phosphate content is stable. After the boiling is completed, reduce the pressure to 0.1MPa, cool to 70℃, drain the boiler water, and rinse with soft water repeatedly until the boiler is clean. Check the drain valve, water level gauge, etc. to prevent blockage.

[0075] The above description is only a preferred embodiment of the present invention and is 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 scope of protection of the present invention.

Claims

1. A casing-tube once-through natural gas boiler, comprising a boiler body (1), a pipeline valve instrument (2) and a natural gas burner (6) mounted on the boiler body (1), characterized in that: The outer side of the boiler body (1) is provided with a boiler outer insulation layer (3); the right side of the top of the boiler body (1) is fixedly connected to a normal pressure economizer (4); the top of the normal pressure economizer (4) is fixedly connected to a chimney (5); The boiler body (1) includes a lower cylinder section (13) and an upper cylinder section (18), the top and bottom of the upper cylinder section (18) are fixedly connected to a top plate (19) and a second tube sheet (16) respectively, the interior of the upper cylinder section (18) is fixedly connected to a first tube sheet (17), the top of the lower cylinder section (13) is fixedly connected to a fourth tube sheet (14) and a third tube sheet (15), the fourth tube sheet (14) is located below the third tube sheet (15), the bottom of the lower cylinder section (13) is fixedly connected to a bottom plate (11), and the center of the upper cylinder section (18) is fixedly connected to an inner cylinder body (11). 2), the inner cylinder (112) penetrates the top plate (19), the tube sheet one (17) and the tube sheet two (16), the outer side of the upper cylinder section (18) is fixedly connected with a safety valve pipe seat (111), a pressure gauge pipe seat (113), an emptying pipe seat (114), a main steam pipe seat (116) and a liquid level gauge pipe seat (117), the outer side of the lower cylinder section (13) is fixedly connected with a water supply pipe seat (119) and an inspection pipe seat (120), and the water supply pipe seat (119) and the inspection pipe seat (120) are both connected between the tube sheet three (15) and the tube sheet four (14). A threaded smoke tube (124) and a straight smoke tube (125) are fixedly connected between the tube sheet one (17) and the tube sheet four (14). The two ends of the threaded smoke tube (124) and the straight smoke tube (125) are connected. The outer walls of the threaded smoke tube (124) and the straight smoke tube (125) are installed with electric heating wires. The threaded smoke tube (124) is located in a circular distribution outside the straight smoke tube (125). A steel tube one (123) is fixedly connected between the tube sheet two (16) and the tube sheet three (15). The outermost steel tubes one (123) are fixedly connected with a sealing plate one (1 29), the threaded smoke pipe (124) and the straight smoke pipe (125) are both located in the steel pipe one (123) and pass through the steel pipe one (123), a steel pipe two (128) is fixedly connected between the tube sheet three (15) and the tube sheet four (14), both ends of the steel pipe two (128) are connected, a steam-water separator (126) is provided between the tube sheet one (17) and the tube sheet two (16), a smoke outlet (131) is fixedly connected to the right side wall of the upper cylinder section (18), and the smoke outlet (131) is located between the tube sheet one (17) and the top plate (19); The pipeline valve instrument (2) includes a circulation pump (211), a fully automatic water softening device (216), a water tank (217), a stop valve 1 (21) installed on the main steam pipe seat (116), and a stop valve 2 (22) installed on the drain pipe seat (114). The top of the pressure gauge pipe seat (113) is fixedly connected to a pressure gauge seat (24). The pressure gauge seat (24) is fixedly connected to a water trap (25). Two three-way valves (26) are installed on the water trap (25) and are connected to the water trap through the three-way valve. The valve (26) is connected to a pressure gauge (27), a pressure controller (28) is fixedly connected to the water trap (25), a right-angle elbow (210) is fixedly connected between the smoke outlet (131) and the normal pressure economizer (4), a vertical partition is provided inside the water tank (217) to divide it into a cold water area and a hot water area, the input end and the output end of the circulating pump (211) are respectively connected to the cold water area of ​​the water tank (217) and the normal pressure economizer (4), the fully automatic water softening device (216) and the normal pressure economizer (4) are respectively connected to the cold water area and the hot water area of ​​the water tank (217), the hot water area of ​​the water tank (217) is connected to the water supply pipe seat (119), and the water tank (217) and the water supply pipe seat (119) are sequentially connected with a Y-type filter (218), a water flow meter (224), a stop valve 5 (219), a water pump (220) and a check valve (221), and the left outer wall of the upper cylinder section (18) and the lower cylinder section (13) is connected with a liquid level gauge connecting pipe (212), and the liquid level gauge connecting pipe The lower end of (212) is connected to the liquid level gauge tube seat (117), the side of the liquid level gauge connecting pipe (212) is fixedly connected to a magnetic flap liquid level gauge (214), the upper and lower ends of the liquid level gauge connecting pipe (212) and the magnetic flap liquid level gauge (214) are both connected to a stop valve three (213), the bottom end of the magnetic flap liquid level gauge (214) is fixedly connected to a stop valve four (215), and the bottom end of the liquid level gauge connecting pipe (212) is fixedly connected to a gate valve (222) and a drain valve (223) connected in series.

2. The double-tube once-through natural gas boiler according to claim 1, characterized in that: The steam-water separator (126) comprises a fan-shaped bottom plate (1261), a plurality of side hole plates (1262) are fixedly connected to the top of the fan-shaped bottom plate (1261), the side surfaces of the side hole plates (1262) are provided with evenly distributed holes, and an arc-shaped plate (1263) is fixedly connected between adjacent side hole plates (1262), and a plurality of water leakage holes are provided on the arc-shaped plate (1263).

3. The double-tube once-through natural gas boiler according to claim 1, characterized in that: The liquid level gauge connecting pipe (212) comprises a third steel pipe (2121), both ends of which are fixedly connected to a first elbow (2122), and the third steel pipe (2121) is fixedly connected to three equal-diameter tees (2123), which are respectively connected to the liquid level gauge pipe seat (117) and two third stop valves (213).

4. The double-tube once-through natural gas boiler according to claim 1, characterized in that: The boiler outer insulation layer (3) includes an angle iron (31) fixed to the outer walls of the upper cylinder section (18) and the lower cylinder section (13); a flat steel (32) is fixedly connected between the outer walls of the angle iron (31); the outer wall of the flat steel (32) is covered with a thin plate (33); the flat steel (32) and the thin plate (33) are fixed by blind aluminum rivets (35); the top of the thin plate (33) is fixedly connected to a top guard plate (36); and insulation cotton (34) is filled between the flat steel (32) and the upper cylinder section (18) and the lower cylinder section (13).

5. The double-tube once-through natural gas boiler according to claim 1, characterized in that: The atmospheric economizer (4) comprises a cylindrical outer plate (44), a condenser (41) being fixedly connected to the center of the inner portion of the outer plate (44), two symmetrical round and square holes (42) being fixedly connected to the inner portion of the outer plate (44), the two round and square holes (42) being respectively located above and below the condenser (41), the outer wall of the outer plate (44) being filled with thermal insulation cotton (43), and the condenser (41) being provided with a water inlet (45) and a water outlet (46).

6. The double-tube once-through natural gas boiler according to claim 1, characterized in that: A rib plate (12) is fixedly connected between the outer wall of the lower cylinder section (13) and the bottom plate (11), and a lifting lug (110) is fixedly connected to the top of the top plate (19).

7. The double-tube once-through natural gas boiler according to claim 1, characterized in that: A sealing plate 2 (130) is fixedly connected between two adjacent steel pipes 1 (123) on the outermost side, and a fire-viewing tube (127) is fixedly connected to the outer wall of the sealing plate 2 (130), and the fire-viewing tube (127) is inclined upward.

8. The double-tube once-through natural gas boiler according to claim 1, characterized in that: The outer wall of the upper cylinder section (18) is provided with a temperature measuring port (115), and the temperature measuring port (115) is located at an upper position between the tube sheet one (17) and the tube sheet two (16); the inner wall of the lower cylinder section (13) is provided with a lower smoke chamber inner insulation layer (121), and the tube sheet three (15) is fixedly connected to the threaded smoke pipe (124) and the sealing plate one (129) with a furnace sealing layer (122).

9. The double-tube once-through natural gas boiler according to claim 1, characterized in that: An inspection door (118) is fixedly connected to the outer wall of the lower cylinder section (13), and the inspection door (118) passes through the outer wall of the lower cylinder section (13); a thermocouple 1 (29) is fixed to the inner wall of the top of the normal pressure economizer (4), and a thermocouple 2 (225) is fixed between the water flow meter (224) and the Y-type filter (218).

10. The double-tube once-through natural gas boiler according to claim 1, characterized in that: The top of the water tank (217) is connected to a vent elbow directly connected to the atmosphere, and the hot water area of ​​the water tank (217) is provided with a dosing port and a sampling port.

Images