System for treating tail gas of coffee baking equipment on large scale

Abstract

The invention relates to the field of tail gas purification equipment, in particular to a system for large-scale treatment of tail gas of coffee baking equipment, a fluid inlet of a first jet device is connected with a tail gas discharge pipe, a suction end of the first jet device is connected with a water source, and a mixed fluid outlet of the first jet device is connected with a gas inlet end of a cyclone dust collector; a fluid inlet and a mixed fluid outlet of the second jet device are respectively connected with the mixing box, a pressure pump is arranged between the fluid inlet of the second jet device and the mixing box, the air outlet end of the cyclone dust collector is connected with the suction end of the second jet device, water is contained in the mixing box, and an exhaust pipe is arranged on the top of the mixing box. The bottom of the mixing box is connected with a separation tank through a liquid discharge pipe, a first valve is arranged on the liquid discharge pipe, and an extraction solvent is arranged in the separation tank; the coffee oil is mixed with water in the second jet device to form an emulsion, firstly, the coffee oil in the emulsion is extracted through petroleum ether, then the petroleum ether is distilled out through the distillation still, and the remaining liquid after distillation is finished is the coffee oil.

Description

Technical Field

[0001] The present invention relates to the field of tail gas purification equipment, and in particular to a system for large-scale treatment of tail gas from coffee roasting equipment. Background Art

[0002] Coffee roasting equipment heats the raw coffee beans at high temperatures, stimulating the aroma of the beans and producing a richer coffee aroma. However, when roasting the raw coffee beans, the coffee roasting equipment will produce exhaust gas, which contains impurities such as oil smoke, dust particles, and silver skin. Direct emission will have an impact on the environment. The exhaust gas contains a small amount of coffee oil, which has the effect of refreshing the mind and promoting the body's metabolism. It also contains a large amount of organic matter such as acetic acid and furfuryl alcohol, as well as some aromatic substances, which can be used as natural flavors.

[0003] In the prior art, the utility model patent with application number CN202322056102.2 discloses a tail gas water treatment and purification device for coffee roasting equipment, including a collection box, an air inlet pipe and an activated carbon adsorbent fixedly connected to the collection box, a spray head 1 fixedly connected to the inner wall of the collection box near the air inlet pipe, a partition 1 and a partition 2 fixedly connected to the collection box between the activated carbon adsorbent and the spray head 1, forming a chamber 1, an air guide 1 passing through and fixedly connected to the partition 1, an air guide 2 passing through and fixedly connected to the partition 2, an air guide 2 and the activated carbon adsorbent are arranged oppositely, and a water inlet pipe passing through and fixedly connected to the collection box. The airflow enters the collection box through the air inlet pipe, the spray head 1 transmits water mist to cover the dust particles in the tail gas, the air guide 1 transmits the airflow to the water surface of the chamber 1, so that the water performs secondary filtration on the dust particles, and the air guide 2 transmits the airflow to the activated carbon adsorbent, so that the activated carbon adsorbent performs tertiary filtration on the tail gas.

[0004] The coffee oil contained in the exhaust gas of the coffee roasting equipment is a valuable natural flavor. Although the above-mentioned exhaust gas water treatment and purification equipment can effectively remove dust and odor in the exhaust gas of the coffee roasting equipment, it is unable to recover the coffee oil contained in the exhaust gas, thus resulting in a waste of resources. Summary of the invention

[0005] The object of the present invention is to provide a system for large-scale treatment of tail gas from coffee roasting equipment, which can effectively remove dust in the tail gas from the coffee roasting equipment and recover coffee oil, so as to solve the defects mentioned in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A system for large-scale treatment of tail gas from coffee roasting equipment comprises a first ejector, wherein the fluid inlet of the first ejector is connected to an exhaust gas discharge pipe, the suction end of the first ejector is connected to a water source, and the mixed fluid outlet of the first ejector is connected to the air inlet of a cyclone dust collector; and further comprises a second ejector and a mixing box, wherein the fluid inlet and the mixed fluid outlet of the second ejector are respectively connected to the mixing box, a booster pump is provided between the fluid inlet of the second ejector and the mixing box, the air outlet end of the cyclone dust collector is connected to the suction end of the second ejector, water is contained in the mixing box, an exhaust pipe is provided on the top of the mixing box, the bottom of the mixing box is connected to a separation tank via a drain pipe, a first valve is provided on the drain pipe, and an extraction solvent is provided in the separation tank.

[0007] As a preferred technical solution, the extraction solvent is petroleum ether.

[0008] As a preferred technical solution, a dispersion disk is fixedly installed in the upper end of the separation tank.

[0009] As a preferred technical solution, a first discharge pipe extending downward is provided at the bottom of the separation tank, a second valve is provided on the first discharge pipe, a second discharge pipe is provided on one side of the first discharge pipe above the second valve, a third valve is provided on the second discharge pipe, and one end of the second discharge pipe away from the first discharge pipe is connected to a water tank, the water tank is connected to the mixing tank via a return pipe, and a first pump body is provided on the return pipe.

[0010] As a preferred technical solution, the separation tank is provided with an air duct, which includes a horizontal pipe, one end of which is connected to one side of the top of the separation tank, and the other end of the horizontal pipe is provided with a vertical pipe extending downward, and the lower end of the vertical pipe is connected to the water tank; one side of the first discharge pipe located above the second discharge pipe is connected to an overflow pipe, and the overflow pipe extends obliquely upward away from one end of the first discharge pipe and is connected to one side of the vertical pipe.

[0011] As a preferred technical solution, a sight glass is provided on the first discharge pipe located between the overflow pipe and the second discharge pipe.

[0012] As a preferred technical solution, the lower end of the first discharge pipe is connected to the distillation kettle, the gas outlet end of the distillation kettle is connected to the condenser, the liquid outlet end of the condenser is connected to the vacuum concentration tank, the liquid outlet end of the vacuum concentration tank is connected to the separation tank through a reflux pipe, and a second pump body is provided on the reflux pipe.

[0013] As a preferred technical solution, the suction end of the first ejector is provided with a plurality of liquid inlet pipes evenly spaced around the axis of the first ejector, one end of the liquid inlet pipe is connected to the first ejector, and one end of the plurality of liquid inlet pipes away from the first ejector is connected to an annular pipe, and the annular pipe is provided with a water inlet.

[0014] Compared with the prior art, the present invention has the following beneficial effects: When the exhaust gas generated by the coffee roasting equipment enters the first ejector, the dust in the exhaust gas combines with the water mist so that the cyclone dust collector can efficiently remove the dust and other solid impurities in the exhaust gas; The suction end of the first ejector is provided with a plurality of liquid inlet pipes evenly spaced around the axis of the first ejector, so that the water mist enters the first ejector more evenly and combines with the dust, further improving the removal effect of dust and other solid impurities in the exhaust gas; The coffee oil contained in the tail gas is mixed with water in the second ejector to form an emulsion. The coffee oil in the emulsion is firstly extracted by petroleum ether, and then the petroleum ether is distilled out by a distillation kettle. The remaining liquid after the distillation is the coffee oil, thereby realizing efficient recovery of the coffee oil and improving economic benefits. The petroleum ether gas evaporated from the distillation kettle is condensed and liquefied by the condenser, and then the petroleum ether is vacuum concentrated by a vacuum concentrator, and the vacuum concentrated petroleum ether is sent back to the separation tank for reuse to avoid waste.

[0015] The above system is applied to the large-scale coffee roasting process to continuously separate dust and recover coffee oil from a large amount of tail gas. It can purify the tail gas while recovering a small amount of coffee oil in the tail gas, further recycling and reusing resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a schematic structural diagram of a first ejector according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of a dispersion disk according to an embodiment of the present invention.

[0018] In the figure: 1-first ejector; 2-exhaust exhaust pipe; 3-intake pipe; 4-cyclone dust collector; 5-liquid inlet pipe; 6-annular pipe; 7-water inlet; 8-second ejector; 9-mixing box; 10-first pipeline; 11-boosting pump; 12-second pipeline; 13-air outlet pipe; 14-exhaust pipe; 15-liquid discharge pipe; 16-separation tank; 17-first valve; 18-water layer; 19-petroleum ether; 20-dispersion disk; 21-first discharge pipe; 22-second valve; 23-second Discharge pipe; 24-third valve; 25-water tank; 26-return pipe; 27-first pump body; 28-air guide pipe; 29-horizontal pipe; 30-vertical pipe; 31-overflow pipe; 32-sight glass; 33-third pipeline; 34-still kettle; 35-fourth valve; 36-liquid outlet pipe; 37-fifth valve; 38-fourth pipeline; 39-condenser; 40-fifth pipeline; 41-vacuum concentration tank; 42-reflux pipe; 43-second pump body; 44-sixth valve; 45-seventh valve. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figures 1 to 3 As shown, a system for large-scale treatment of tail gas from a coffee roasting device comprises a first ejector 1, a fluid inlet of the first ejector 1 is connected to a tail gas discharge pipe 2, a suction end of the first ejector 1 is connected to a water source, and a mixed fluid outlet of the first ejector 1 is connected to an inlet end of a cyclone dust collector 4 through an inlet pipe 3. When the coffee roasting device is in operation, the tail gas enters the first ejector 1 through the tail gas discharge pipe 2, and at the same time, water mist is sucked into the first ejector 1 through the suction end of the first ejector 1, so that the dust in the tail gas is combined with the water mist, so that the dust and other solid impurities in the tail gas can be removed efficiently later; after the dust in the tail gas is combined with the water mist, it enters the cyclone dust collector 4 through the mixed fluid outlet of the first ejector 1 and the inlet pipe 3, and the dust and other solid impurities in the tail gas are removed by the cyclone dust collector 4.

[0021] In this embodiment, if Figure 2 As shown, the suction end of the first ejector 1 is provided with a plurality of liquid inlet pipes 5 evenly spaced around the axis of the first ejector 1, one end of the liquid inlet pipe 5 is connected to the first ejector 1 and communicated with the suction chamber of the first ejector 1, and one end of the plurality of liquid inlet pipes 5 away from the first ejector 1 is connected to an annular pipe 6, and a water inlet 7 is provided on the annular pipe 6 so that the water mist can enter the first ejector 1 more evenly and combine with the dust.

[0022] It also includes a second ejector 8 and a mixing box 9, the fluid inlet of the second ejector 8 is connected to the bottom of the mixing box 9 through a first pipeline 10, the first pipeline 10 is provided with a pressure pump 11, the mixed fluid outlet of the second ejector 8 is connected to one side of the mixing box 9 through a second pipeline 12, the air outlet end of the cyclone dust collector 4 is connected to the suction end of the second ejector 8 through an air outlet pipe 13, the mixing box 9 is filled with water, the top of the mixing box 9 is provided with an exhaust pipe 14, the bottom of the mixing box 9 is connected to the top of the separation tank 16 through a drain pipe 15, the drain pipe 15 is provided with a first valve 17, a water layer 18 is provided in the separation tank 16, and an extraction solvent is provided above the water layer 18. The extraction solvent in this embodiment is specifically petroleum ether 19.

[0023] When the booster pump 11 is working, the water in the mixing box 9 enters the fluid inlet of the second ejector 8 through the first pipeline 10; at the same time, the exhaust gas of the coffee roasting equipment is mixed with the water mist through the first ejector 1 and enters the cyclone dust collector 4, and the solid impurities such as dust in the exhaust gas are removed by the cyclone dust collector 4. The exhaust gas without solid impurities is then sucked into the second ejector 8 through the outlet pipe 13, and the coffee oil contained in the exhaust gas is mixed with water in the second ejector 8 to form an emulsion, and enters the mixing box 9 through the mixed fluid outlet of the second ejector 8 and the second pipeline 12 for temporary storage, and the exhaust gas without solid impurities and coffee oil is discharged from the exhaust pipe 14 at the top of the mixing box 9.

[0024] When the coffee roasting equipment stops running, the first valve 17 is opened to allow the emulsion of coffee oil and water to enter the separation tank 16 through the discharge pipe 15, and the coffee oil in the emulsion is extracted by the petroleum ether 19 in the separation tank 16.

[0025] In this embodiment, a dispersion plate 20 is fixedly installed in the upper end of the separation tank 16. Figure 3 As shown, the dispersion plate 20 is evenly distributed with a plurality of water-permeable holes so that the emulsion of coffee oil and water can be evenly dispersed into the separation tank 16 to improve the extraction efficiency.

[0026] A first discharge pipe 21 extending downward is provided at the bottom of the separation tank 16, a second valve 22 is provided on the first discharge pipe 21, a second discharge pipe 23 is provided on one side of the first discharge pipe 21 above the second valve 22, a third valve 24 is provided on the second discharge pipe 23, and one end of the second discharge pipe 23 away from the first discharge pipe 21 is connected to a water tank 25, the water tank 25 is connected to the mixing tank 9 through a return pipe 26, and a first pump body 27 is provided on the return pipe 26. When the petroleum ether 19 in the separation tank 16 has finished extracting the coffee oil, the third valve 24 on the second discharge pipe 23 is opened, and the water in the lower layer of the separation tank 16 is first discharged through the second discharge pipe 23, and the discharged water enters the water tank 25, and the first pump body 27 is opened to make the water in the water tank 25 flow back to the mixing tank 9 through the return pipe 26; when the water in the separation tank 16 has finished being discharged, the third valve 24 is closed and the second valve 22 is opened, and the petroleum ether mixed with coffee oil is discharged through the first discharge pipe 21.

[0027] The separation tank 16 is provided with an air guide pipe 28, and the gas entering the separation tank 16 can be discharged through the air guide pipe 28. The air guide pipe 28 includes a transverse pipe 29, one end of which is connected to one side of the top of the separation tank 16, and the other end of the transverse pipe 29 is provided with a vertical pipe 30 extending downward, the lower end of the vertical pipe 30 is connected to the water tank 25, and the end of the transverse pipe 29 is provided with an air valve to balance the air pressure in the pipe when draining water, so as to facilitate the draining of water; an overflow pipe 31 is connected to one side of the first discharge pipe 21 located above the second discharge pipe 23, and the overflow pipe 31 extends obliquely upward away from one end of the first discharge pipe 21 and connects to one side of the vertical pipe 30. When the second valve 22 and the third valve 24 are both closed, when the first valve 17 is opened, the emulsion in the mixing box 9 enters the separation tank 16. After the liquid level in the separation tank 16 rises, according to the principle of communicating vessels, the water in the lower layer of the separation tank 16 will overflow into the vertical pipe 30 through the overflow pipe 31 and enter the water tank 25, thereby preventing the petroleum ether in the upper layer from overflowing.

[0028] A sight glass 32 is provided on the first discharge pipe 21 between the overflow pipe 31 and the second discharge pipe 23. When the third valve 24 is opened to discharge the water in the lower layer of the separation tank 16, the sight glass 32 can be used to observe whether the water in the separation tank 16 has been completely discharged.

[0029] The lower end of the first discharge pipe 21 is connected to the top side of the distillation kettle 34 through the third pipeline 33, and a fourth valve 35 is provided at the end of the third pipeline 33 close to the distillation kettle 34, and a liquid outlet pipe 36 is provided at the bottom of the distillation kettle 34, and a fifth valve 37 is provided on the liquid outlet pipe 36; the gas outlet end at the top of the distillation kettle 34 is connected to the condenser 39 through the fourth pipeline 38, and the liquid outlet end of the condenser 39 is connected to the vacuum concentration tank 41 through the fifth pipeline 40, and the liquid outlet end of the vacuum concentration tank 41 is connected to the top side of the separation tank 16 through the reflux pipe 42, and a second pump body 43 is provided on the reflux pipe 42, and a sixth valve 44 is provided at the end of the reflux pipe 42 close to the vacuum concentration tank 41, and a seventh valve 45 is provided at the end of the reflux pipe 42 close to the separation tank 16.

[0030] When the water in the separation tank 16 is completely discharged, the third valve 24 is closed and the second valve 22 and the fourth valve 35 are opened, and the petroleum ether mixed with coffee oil enters the distillation kettle 34 through the first discharge pipe 21 and the third pipeline 33; then the second valve 22 and the fourth valve 35 are closed, and the coffee oil and petroleum ether are heated and distilled by the distillation kettle 34 to evaporate the petroleum ether. The remaining liquid after the distillation is completed is the coffee oil, and the fifth valve 37 on the liquid outlet pipe 36 can be opened to discharge the coffee oil from the distillation kettle 34.

[0031] The petroleum ether gas enters the condenser 39 through the fourth pipeline 38 to be condensed and liquefied, and then enters the vacuum concentration tank 41 through the fifth pipeline 40. The petroleum ether is vacuum concentrated by the vacuum concentration tank 41. After the vacuum concentration is completed, the sixth valve 44 and the seventh valve 45 are opened, and the second pump body 43 is opened at the same time, so that the vacuum concentrated petroleum ether is refluxed to the separation tank 16 through the reflux pipe 42 for repeated use.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A system for large-scale treatment of tail gas from coffee roasting equipment, characterized in that: It comprises a first ejector, wherein the fluid inlet of the first ejector is connected to the exhaust gas discharge pipe, the suction end of the first ejector is connected to a water source, and the mixed fluid outlet of the first ejector is connected to the air inlet end of the cyclone dust collector; It also includes a second ejector and a mixing box, wherein the fluid inlet and the mixed fluid outlet of the second ejector are respectively connected to the mixing box, a pressure pump is arranged between the fluid inlet of the second ejector and the mixing box, the air outlet end of the cyclone dust collector is connected to the suction end of the second ejector, the mixing box is filled with water, an exhaust pipe is arranged on the top of the mixing box, the bottom of the mixing box is connected to a separation tank via a drain pipe, a first valve is arranged on the drain pipe, and an extraction solvent is arranged in the separation tank.

2. A system for large-scale treatment of tail gas from coffee roasting equipment as claimed in claim 1, characterized in that: The extraction solvent is petroleum ether.

3. The system for large-scale treatment of tail gas from coffee roasting equipment according to claim 1, characterized in that: A dispersion disk is fixedly installed in the upper end of the separation tank.

4. The system for large-scale treatment of tail gas from coffee roasting equipment according to claim 1, characterized in that: A first discharge pipe extending downward is provided at the bottom of the separation tank, a second valve is provided on the first discharge pipe, a second discharge pipe is provided on one side of the first discharge pipe above the second valve, a third valve is provided on the second discharge pipe, an end of the second discharge pipe away from the first discharge pipe is connected to a water tank, the water tank is connected to the mixing tank via a return pipe, and a first pump body is provided on the return pipe.

5. A system for large-scale treatment of tail gas from coffee roasting equipment as claimed in claim 4, characterized in that: An air duct is provided on the separation tank, and the air duct includes a horizontal pipe, one end of which is connected to one side of the top of the separation tank, and the other end of the horizontal pipe is provided with a vertical pipe extending downward, and the lower end of the vertical pipe is connected to the water tank; one side of the first discharge pipe located above the second discharge pipe is connected to an overflow pipe, and the overflow pipe extends obliquely upward away from one end of the first discharge pipe and is connected to one side of the vertical pipe.

6. A system for large-scale treatment of tail gas from coffee roasting equipment as claimed in claim 5, characterized in that: A sight glass is provided on the first discharge pipe located between the overflow pipe and the second discharge pipe.

7. The system for large-scale treatment of tail gas from coffee roasting equipment according to claim 4, characterized in that: The lower end of the first discharge pipe is connected to the distillation kettle.

8. The system for large-scale treatment of tail gas from coffee roasting equipment according to claim 7, characterized in that: The gas outlet end of the distillation kettle is connected to the condenser, the liquid outlet end of the condenser is connected to the vacuum concentration tank, the liquid outlet end of the vacuum concentration tank is connected to the separation tank through a reflux pipe, and a second pump body is provided on the reflux pipe.

9. The system for large-scale treatment of tail gas from coffee roasting equipment according to claim 1, characterized in that: The suction end of the first ejector is provided with a plurality of liquid inlet pipes evenly spaced around the axis of the first ejector, one end of the liquid inlet pipe is connected to the first ejector, and one end of the plurality of liquid inlet pipes away from the first ejector is connected to an annular pipe, and the annular pipe is provided with a water inlet.

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