Flue gas waste heat utilization device of crude benzene tube furnace

Abstract

The utility model discloses a crude benzene tubular furnace flue gas waste heat utilization device which comprises a tubular furnace and a heat exchanger, the tubular furnace comprises a radiation chamber, a convection chamber and a chimney, the chimney is connected with a cyclone dust collector, the heat exchanger is of a vertical shell-and-tube structure, the cyclone dust collector is communicated with a tube pass at the top of the heat exchanger, and a shell pass outlet of the heat exchanger is connected with a steam pocket. A steam outlet of the steam pocket is communicated with a bent pipe arranged in the convection chamber, a condensate water outlet of the steam pocket is connected with a water tank, a heat exchange assembly is arranged in the water tank, a gas conveying pipe is arranged at a tube pass outlet in the bottom of the heat exchanger, and a jacket is arranged on the outer wall of the gas conveying pipe. A plurality of annular scrapers are evenly distributed on the mandrel in the length direction of the mandrel, a plurality of vent holes are machined in the circumferences of the scrapers, the lower end of the mandrel extends into a tube box below the heat exchanger and then is connected with a lifting plate, and an air cylinder is installed at the bottom of the heat exchanger. In conclusion, the waste heat recovery device has the advantages of being not prone to being blocked, high in recovery efficiency and little in waste heat waste.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas waste heat utilization technical field, concretely relates to a crude benzol pipe furnace flue gas waste heat utilization device. BACKGROUND

[0002] The pipe furnace is the heating equipment of crude benzol distillation, is used to heat the rich oil in the crude benzol distillation, thereby is the important equipment of rectification separation, in the crude benzol production of coking enterprise, with the washing oil to do the absorbent through the coke oven gas to recover the crude benzol, the exhaust gas temperature of the pipe furnace combustion in the production crude benzol reaches 200~250 DEG C, the existing exhaust gas treatment method is directly discharged to the air, has caused the great waste of energy, also has polluted the surrounding environment. At present, when recycling the flue gas waste heat through the waste heat utilization equipment, because the flue gas contains a large amount of smoke dust, when the smoke dust enters the heat exchange equipment, it is easy to cause the dirt adhesion on the inner wall of the heat exchange equipment and cause the blockage problem, which affects the recycling efficiency of the flue gas waste heat, the discharged flue gas temperature is still high, and there is still great waste of waste heat. SUMMARY

[0003] The utility model provides a kind of crude benzol pipe furnace flue gas waste heat utilization device, which is not easy to block, has high recovery efficiency and little waste of waste heat.

[0004] The utility model discloses a kind of crude benzol pipe furnace flue gas waste heat utilization device, which is not easy to block, has high recovery efficiency and little waste of waste heat. The utility model discloses a kind of crude benzol pipe furnace flue gas waste heat utilization device, which is not easy to block, has high recovery efficiency and little waste of waste heat. The utility model discloses a kind of crude benzol pipe furnace flue gas waste heat utilization device, which is not easy to block, has high recovery efficiency and little waste of waste heat. The utility model discloses a kind of crude benzol pipe furnace flue gas waste heat utilization device, which is not easy to block, has high recovery efficiency and little waste of waste heat. The utility model discloses a kind of crude benzol pipe furnace flue gas waste heat utilization device, which is not easy to block, has high recovery efficiency and little waste of waste heat.

[0005] Further, the pipe box above and below the lifting plate is provided with a limit plate.

[0006] Further, the distance between the two limit plates is greater than the distance between the adjacent two scrapes on the same core shaft.

[0007] Further, the lower end of the mandrel is connected with the lifting plate through a flange.

[0008] Further, a plurality of protruding annular cavities are arranged on the gas conveying pipe in the jacket.

[0009] Further, the gas inlet of the jacket is tangentially communicated with the outer wall of the jacket.

[0010] Further, the jacket and the outlet of the heat exchange assembly are communicated with a gas mixer.

[0011] Further, the cross section of the lifting plate is arc-shaped with a convex edge in the middle and a concave edge at the bottom.

[0012] Further, a filter screen is arranged in the heat exchanger tube box below the lifting plate, and a dust discharging port is arranged on the lower end of the tube box side wall of the filter screen.

[0013] The utility model discloses a heat exchange assembly and jacket are passed through cold air in the above -mentioned process, one cold air absorbs the waste heat in the condensate water in water tank, reduces the temperature of condensate water, promotes the heat exchange efficiency of subsequent condensate water and flue gas, another cold air absorbs the waste heat in flue gas, further absorbs the waste heat in flue gas, reduces flue gas temperature, reduces the waste of waste heat, improves air temperature simultaneously, realizes the waste heat of air, then the hot air is passed into the radiant chamber of tubular furnace, plays the purpose of combustion-supporting, improves combustion efficiency. In the utility model, on one hand, the high-temperature dry dust removal is carried out to flue gas by using cyclone dust collector, reduces the smoke dust content in flue gas, on the other hand, the core shaft and scraper are set up in the heat exchange pipe of heat exchanger, when the equipment operates, can move up and down through the cylinder drive lifting plate, the lifting plate drives the core shaft to move up and down, and then drives the scraper to move up and down, the edge of scraper can scrape the dirt adhered on the inner wall of heat exchange pipe, then is discharged from the air hole along with flue gas, through the mechanical cleaning mode, the heat exchange pipe inner wall is kept clean, and then the heat exchange efficiency of flue gas and cold water is ensured, and the heat exchange pipe blockage problem is eradicated, and the heat exchange efficiency of flue gas and cold water is ensured, and the heat exchange pipe blockage problem is eradicated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the whole structure schematic diagram of the utility model;

[0015] Figure 2 It is Figure 1 It is the amplification structure schematic diagram of node A in the utility model;

[0016] Figure 3 It is the structure schematic diagram of core shaft 14 and scraper 15 in the utility model;

[0017] In the figure: 1-heat exchanger, 2-radiation chamber, 3-convection chamber, 4-chimney, 5-flap, 6-cyclone dust collector, 7-steam drum, 8-bend, 9-water tank, 10-heat exchange assembly, 11-gas conveying pipe, 12-jacket, 13-heat exchange pipe, 14-spindle, 15-blade, 16-vent hole, 17-lifting plate, 18-cylinder, 19-limiting plate, 20-flange, 21-annular cavity, 22-gas mixer, 23-filter screen. DETAILED DESCRIPTION

[0018] The utility model makes further explanation in combination with the drawings, but not in any way to the utility model add restrictions, based on the utility model made, any change or improvement, all belong to the protection scope of the utility model.

[0019] As Figures 1 to 3 shown, the utility model includes tubular furnace and heat exchanger 1, tubular furnace includes radiation chamber 2, convection chamber 3 and chimney 4 in proper order, and tubular furnace is prior art equipment, the flap 5 is arranged in the chimney 4, the flap 5 is used to cut off flue gas from the chimney 4 when the utility model normally operates, makes flue gas transport to cyclone dust collector 6, and when the equipment in the utility model appears accident and can not normally operate, can start the flap 5, so that flue gas is discharged from the chimney 4, the chimney 4 below the flap 5 is connected with cyclone dust collector 6, the heat exchanger 1 is vertical tube shell structure, the gas outlet of cyclone dust collector 6 is communicated with the tube pass of the top of heat exchanger 1, the shell pass outlet of heat exchanger 1 is connected with steam drum 7, the steam outlet of steam drum 7 is communicated with the bend 8 arranged in convection chamber 3, the condensate water outlet of steam drum 7 is connected with water tank 9, and the water outlet of water tank 9 is connected with the water inlet of the shell of heat exchanger 1, heat exchange assembly 10 is arranged in water tank 9, heat exchange assembly 10 is prior art heat exchange structure, and air is led into inside, is used to absorb the heat in the condensate water in water tank 9, and the tube pass outlet at the bottom of heat exchanger 1 is provided with the gas conveying pipe 11 in communication with the chimney 4, the outer wall of gas conveying pipe 11 is provided with the jacket 12, the jacket 12 and the outlet of heat exchange assembly 10 are communicated with radiation chamber 2, the heat exchange pipe 13 of heat exchanger 1 is provided with the spindle 14, the spindle 14 is uniformly distributed with a plurality of annular blades 15 along its length direction, the edge of blade 15 can be contacted with the inner wall of heat exchange pipe 13, or a certain gap can be left between the inner wall of heat exchange pipe 13, is convenient for up and down movement, is convenient for scraping the dirt on the inner wall of heat exchange pipe 13, a plurality of vent holes 16 are processed on the circumference of blade 15, vent hole 16 is used for the ventilation of flue gas on the one hand, and is also used for the discharge of dirt on the other hand, the lower end of spindle 14 is connected with lifting plate 17 after extending into the pipe box below heat exchanger 1, and the bottom of heat exchanger 1 is installed with cylinder 18, and the piston rod of cylinder 18 is connected with lifting plate 17.

[0020] The utility model discloses a heat exchange assembly 10 and the jacket 12 are passed through in the above process, and cold air is passed in in heat exchange assembly 10 and the jacket 12, and one cold air absorbs the waste heat in the condensate in water tank 9, reduces the temperature of condensate, promotes the heat exchange efficiency of subsequent condensate and flue gas, and another cold air absorbs the waste heat in flue gas, further absorbs the waste heat in flue gas, reduces the temperature of flue gas, reduces the waste of waste heat, improves air temperature simultaneously, realizes the waste heat of air, then passes hot air into the radiation chamber 2 of tubular furnace, plays the purpose of combustion-supporting, improves combustion efficiency.

[0021] In the utility model, one aspect utilizes cyclone dust collector 6 to carry out high temperature dry dust removal to flue gas, reduces the smoke dust content in flue gas, and the other aspect is provided with core shaft 14 and scraper 15 in the heat exchange pipe 13 of heat exchanger 1, when the equipment operates, can move up and down through the air cylinder 18 drive lifting plate 17, lifting plate 17 drive core shaft 14 to move up and down, and then drive scraper 15 to move up and down, and the edge of scraper 15 can scrape the dirt adhered on the inner wall of heat exchange pipe 13, and then is discharged from air hole 16 along with flue gas, through the mechanical cleaning mode, ensure that the inner wall of heat exchange pipe 13 is clean, and then ensure the heat exchange efficiency of flue gas and cold water, and eradicate the blockage problem of heat exchange pipe 13, and secondly, the waste heat is recycled four times in the utility model, once through cold water to absorb the waste heat in flue gas, once through cold air to recycle the waste heat of flue gas, once through cold air to recycle the waste heat in condensate, and once utilizes saturated steam to absorb the waste heat in convection chamber 3, through multiple recycling, can improve the recycling efficiency of flue gas waste heat greatly, simultaneously, generates superheated steam and hot air, increases the utilization way and utilization efficiency of waste heat, reduces the discharge temperature of flue gas, and reduces the waste of flue gas waste heat.

[0022] The pipe box above and below lifting plate 17 is provided with limit plate 19, and limit plate 19 is used for limiting lifting plate 17, preventing lifting plate 17 from colliding with the lower tube plate of heat exchanger 1 and the bottom of pipe box.

[0023] The distance between the two limiting plates 19 defines the distance of the up and down movement of the mandrel 14 and the wiper blade 15, if the distance is too small, less than the distance between the two adjacent wiper blades 15, the dirt on the inner wall of the heat exchange tube 13 cannot be completely scraped off, in order to avoid this problem, the distance between the two limiting plates 19 is greater than the distance between the two adjacent wiper blades 15 on the same mandrel 14.

[0024] In order to facilitate the disassembly and assembly between the mandrel 14 and the lifting plate 17, the lower end of the mandrel 14 is connected with the lifting plate 17 through the flange 20.

[0025] A plurality of protruding annular cavities 21 are arranged on the gas conveying pipe 11 in the jacket 12, the cross-sectional area of the annular cavity 21 is greater than the cross-sectional area of the gas conveying pipe 11, when the flue gas flows into the annular cavity 21 from the gas conveying pipe 11, due to the increase of the flow cross section, the flow rate of the flue gas is slowed down, thereby increasing the heat exchange time of the flue gas and the cold air, secondly, the annular cavity 21 can also increase the heat exchange area of the flue gas and the cold air, and improve the heat exchange efficiency of the cold air and the flue gas.

[0026] The gas inlet of the jacket 12 is tangentially communicated with the outer wall of the jacket 12, the cold air is introduced into the jacket 12, for absorbing the waste heat of the flue gas in the gas conveying pipe 11, in actual use, the cold air has the problems of uneven distribution and flow dead angle in the jacket 12, which is not conducive to the absorption of the waste heat of the flue gas, in order to solve this problem, the cold air is tangentially introduced into the jacket 12, and then spirally flows in the annular space between the jacket 12 and the gas conveying pipe 11, thereby eliminating the flow dead angle of the cold air, and making the cold air uniformly distributed in the jacket 12, and improving the heat exchange efficiency of the cold air and the flue gas.

[0027] The jacket 12 and the outlet of the heat exchange assembly 10 are communicated with a gas mixer 22. The gas mixer 22 is a prior art device for mixing two or more gases, in the present application, two hot air streams will be introduced into the gas mixer 22, one is provided by the jacket 12, and the other is provided by the heat exchange assembly 10 in the water tank 9, the temperatures of the two hot air streams are different, the two hot air streams are mixed in the gas mixer 22 to average the temperature, and the output temperature of the hot air is stabilized, which is conducive to the combustion supporting effect of the hot air after being sent into the radiation chamber 2.

[0028] The cross-sectional shape of the lifting plate 17 is arc-shaped with the upper middle convex edge and the lower middle concave edge. The dirt adhered on the heat exchange tube 13 is scraped off by the wiper blade 15, and then falls from the air hole 16 on each wiper blade 15 in turn, and finally falls on the lifting plate 17. In order to prevent the dirt from accumulating on the lifting plate 17, the lifting plate 17 is arranged in the structure of the upper middle convex edge and the lower middle concave edge. On the one hand, the dirt will slide down along the middle part of the lifting plate 17, and on the other hand, the flue gas will blow the dirt, ensuring that the dirt can slide down from the lifting plate 17 in time.

[0029] The heat exchanger 1 pipe box under the lifting plate 17 is obliquely provided with a filter screen 23, and a dust discharge port is arranged on the pipe box side wall of the lower end of the filter screen 23. In the use process of the utility model, the dirt scraped off from the inner wall of the heat exchange pipe 13 by the scraping piece 15 will flow downward together with the flue gas, and the process of scraping off the dirt undoubtedly increases the content of the flue dust in the flue gas. The filter screen 23 is arranged for filtering the flue gas, filtering out the dirt and dust in the flue gas, reducing the possibility of dirt adhering to the inner wall of the subsequent gas conveying pipe 11, and preventing the gas conveying pipe 11 from being blocked.

Claims

1. A crude benzene tubular furnace flue gas waste heat utilization device, comprising a tubular furnace and a heat exchanger (1), the tubular furnace comprising a radiation chamber (2), a convection chamber (3) and a chimney (4) in sequence, characterized in that The chimney (4) is provided with a flap (5), the chimney (4) below the flap (5) is connected with a cyclone dust collector (6), the heat exchanger (1) is a vertical tube-shell structure, the gas outlet of the cyclone dust collector (6) is communicated with the tube side of the top of the heat exchanger (1), the shell side outlet of the heat exchanger (1) is connected with a steam drum (7), the steam outlet of the steam drum (7) is communicated with a bend pipe (8) arranged in the convection chamber (3), the condensate water outlet of the steam drum (7) is connected with a water tank (9), the water outlet of the water tank (9) is connected with the water inlet of the shell of the heat exchanger (1), the water tank (9) is provided with a heat exchange assembly (10), the tube side outlet of the bottom of the heat exchanger (1) is provided with a gas conveying pipe (11) communicated with the chimney (4), the outer wall of the gas conveying pipe (11) is provided with a jacket (12), the jacket (12) and the outlet of the heat exchange assembly (10) are communicated with the radiation chamber (2), the heat exchange pipe (13) of the heat exchanger (1) is provided with a mandrel (14), a plurality of annular scrapers (15) are uniformly distributed on the mandrel (14) along the length direction, a plurality of air holes (16) are processed on the circumference of the scraper (15), the lower end of the mandrel (14) extends into the tube box below the heat exchanger (1) and is connected with a lifting plate (17), the bottom of the heat exchanger (1) is provided with a gas cylinder (18), the piston rod of the gas cylinder (18) is connected with the lifting plate (17).

2. The device for utilizing flue gas waste heat of a crude benzol tubular furnace according to claim 1, characterized in that: The tube box above and below the lifting plate (17) is provided with a limiting plate (19).

3. The device for utilizing flue gas waste heat of a crude benzol tubular furnace according to claim 2, characterized in that: The distance between the two limiting plates (19) is greater than the distance between the adjacent two scrapers (15) on the same mandrel (14).

4. The device according to claim 1, characterized in that: The lower end of the mandrel (14) is connected with the lifting plate (17) through a flange (20).

5. The device for utilizing flue gas waste heat of a crude benzol tubular furnace according to claim 1, characterized in that: A plurality of protruding annular cavities (21) are arranged on the gas conveying pipe (11) in the jacket (12) at intervals.

6. The device for utilizing flue gas waste heat of a crude benzol tubular furnace according to claim 1, characterized in that: The gas inlet on the jacket (12) is communicated with the outer wall of the jacket (12) tangentially.

7. The device according to claim 1, characterized in that: The jacket (12) and the outlet of the heat exchange assembly (10) are communicated with a gas mixer (22).

8. The device for utilizing flue gas waste heat of a crude benzol tubular furnace according to claim 1, characterized in that: The cross section of the lifting plate (17) is arc-shaped with the upper middle part convex and the lower middle part concave.

9. The device for utilizing flue gas waste heat of a crude benzol tubular furnace according to claim 1, characterized in that: The tube box below the lifting plate (17) is provided with a filter screen (23) inclinedly, and the lower end of the filter screen (23) is provided with a dust discharge port on the side wall of the tube box.

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