Biodiesel tail gas combustion system

Abstract

The utility model discloses a biodiesel tail gas combustion system which solves the technical problems that a catalytic combustion device is difficult to be applied to biodiesel tail gas treatment and a heat storage combustion device can generate more dioxin when the biodiesel tail gas is combusted. The device comprises a distillation tower, a recovery mechanism, a pretreatment mechanism, a catalytic combustion mechanism, a heat storage combustion mechanism and a fireproof mechanism. After the pretreatment mechanism treats the tail gas, the tail gas can be directly introduced into the catalytic combustion device for combustion; most organic pollutants in biodiesel tail gas are combusted through the catalytic combustion device, then the tail gas obtained after combustion of the catalytic combustion device is introduced into the heat storage combustion device, the content of the organic pollutants in the waste gas introduced into the heat storage combustion device is small, and the content of dioxin generated when the heat storage combustion device is used can be effectively reduced; and the emission of dioxin reaches the standard.

Description

Technical Field

[0001] The utility model belongs to the technical field of biodiesel, and in particular relates to a biodiesel tail gas combustion system. Background Art

[0002] Due to the complexity of the raw material composition used to produce biodiesel, the exhaust gas produced during the biodiesel production process has a relatively complex composition, mainly including mixed organic exhaust gases such as alcohols, aldehydes, ketones, esters, and a small amount of mixed inorganic exhaust gases such as nitrogen oxides, sulfides, chlorides, and phosphides. Direct emissions will cause pollution to the natural environment.

[0003] Existing methods for treating organic waste gas include catalytic combustion and thermal storage combustion. The effects of using catalytic combustion and thermal storage combustion to treat organic waste gas are obvious. However, the catalytic combustion device contains a catalyst. Biodiesel exhaust contains sulfur, chlorine, phosphorus compounds and other components that poison the catalyst, reducing the catalytic effect of the catalyst, making it difficult to apply the catalytic combustion device to biodiesel exhaust treatment. If the thermal storage combustion device is directly applied to biodiesel exhaust treatment, the thermal storage combustion device will produce a large amount of dioxins due to incomplete combustion, resulting in substandard dioxin emissions. Dioxins are carcinogens, and their substandard emissions will affect public health. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a biodiesel tail gas combustion system to at least solve part of the above technical problems.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A biodiesel tail gas combustion system comprises a recovery mechanism connected to a distillation tower of tail gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism comprises a bag filter connected to the distillation tower, a vacuum pump connected to the bag filter, and a methanol recovery mechanism connected to the pretreatment mechanism from the vacuum pump.

[0007] Furthermore, the pretreatment mechanism includes a fan A connected to the methanol recovery mechanism, a spray tower connected to the fan A, a desulfurization tower connected to the spray tower, a denitrification device connected to the denitrification device, a dechlorination device connected to the denitrification device, and a dephosphorization device connected to the catalytic combustion mechanism from the dechlorination device.

[0008] Furthermore, the catalytic combustion mechanism includes a catalytic combustion device, and a fireproof pipe A connected between the pretreatment mechanism and the catalytic combustion device; the fireproof pipe A is provided with a first concentration detector, a humidity detector, a dehumidifier and a fan B in sequence along its air flow direction, and the fireproof pipe A is connected to a concentration regulating fan A, which is located between the first concentration detector and the humidity detector.

[0009] Furthermore, the heat storage combustion mechanism includes a fireproof pipe B connected from the catalytic combustion device, a buffer tank connected from the fireproof pipe B, a fireproof pipe C connected from the buffer tank, a heat storage combustion device connected from the fireproof pipe C, and a fireproof pipe D connected from the heat storage combustion device.

[0010] Furthermore, the fireproof pipe B is provided with a first water curtain cabinet, a second concentration detector and a fan D in sequence along the airflow direction, and the fireproof pipe B is connected with a concentration regulating fan B located between the second concentration detector and the fan D;

[0011] Furthermore, a fan E and a second water curtain cabinet are sequentially arranged on the fireproof pipe D along the airflow direction.

[0012] Furthermore, the fire prevention mechanism includes a fire-blocking mechanism and a cooling mechanism for cooling the gas in the fire-proof pipe A, the fire-proof pipe B, the fire-proof pipe C and the fire-proof pipe D respectively; and one of the fire-blocking mechanisms is provided on the fire-proof pipe A, the fire-proof pipe B, the fire-proof pipe C and the fire-proof pipe D respectively.

[0013] Furthermore, the fire-blocking mechanism includes a first air valve, a flame arrester and a second air valve, which are respectively arranged on the fire-blocking pipe A, the fire-blocking pipe B, the fire-blocking pipe C or the fire-blocking pipe D, and the first air valve, the flame arrester and the second air valve are sequentially distributed along the airflow direction of the fire-blocking pipe A, the fire-blocking pipe B, the fire-blocking pipe C or the fire-blocking pipe D.

[0014] Furthermore, the cooling mechanism includes a sprayer for spraying water mist on the outer tube walls of the fireproof tube A, the fireproof tube B, the fireproof tube C and the fireproof tube D for cooling.

[0015] Furthermore, the methanol recovery mechanism includes a primary condenser connected to the vacuum pump, a primary recovery tank connected to the primary condenser, a secondary condenser connected to the primary recovery tank, and a secondary recovery tank connected to the secondary condenser; the secondary recovery tank is connected to the pretreatment mechanism.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model has a simple structure, a scientific and reasonable design, and is easy to use. The inorganic waste gas in the biodiesel tail gas is pre-treated by a pretreatment mechanism, so that the treated tail gas can be directly introduced into the catalytic combustion device for combustion, solving the problem that the catalytic combustion device is difficult to be applied to the treatment of biodiesel tail gas. The catalytic combustion device is used to burn most of the organic pollutants in the biodiesel tail gas, and then the tail gas after the catalytic combustion device is burned is introduced into the thermal storage combustion device. The organic pollutant content in the waste gas introduced into the thermal storage combustion device is relatively low, which can effectively reduce the dioxin content generated when the thermal storage combustion device is used, so that the dioxin emission meets the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model.

[0019] The names corresponding to the reference numerals are:

[0020] 1-distillation tower, 2-bag dust collector, 3-vacuum pump, 4-fan A, 5-spray tower, 6-desulfurization tower, 7-denitrification device, 8-dechlorination device, 9-dephosphorization device, 10-first concentration detector, 11-concentration adjustment fan A, 12-humidity detector, 13-dehumidifier, 14-fan B, 15-catalytic combustion device, 16-first water curtain cabinet, 17-second concentration detector, 18-fan D, 19-concentration adjustment fan B, 20-buffer tank, 21-heat storage combustion device, 22-fan E, 23-second water curtain cabinet, 24-sprayer, 25-fireproof pipe, 26-first gas valve, 27-flame arrester, 28-second gas valve, 29-first condenser, 30-first recovery tank, 31-second condenser, 32-second recovery tank, 33-fireproof pipe B, 34-fireproof pipe C, 35-fireproof pipe D. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore they cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example 1

[0025] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0026] In the utility model, two adjacent devices are connected via a pipeline.

[0027] The utility model has a simple structure, a scientific and reasonable design, and is easy to use. It uses a pretreatment mechanism to pre-treat the inorganic waste gas in the biodiesel tail gas, so that the treated tail gas can be directly passed into the catalytic combustion device for combustion, solving the problem that the catalytic combustion device cannot be used for biodiesel tail gas treatment. The catalytic combustion device is used to burn most of the organic pollutants in the biodiesel tail gas, and then the tail gas after the catalytic combustion device is burned is passed into the thermal storage combustion device. The organic pollutant content in the waste gas passed into the thermal storage combustion device is relatively low, which can effectively reduce the dioxin content generated when the thermal storage combustion device is used, so that the dioxin emission meets the standard; the concentration of combustible gas in the waste gas input into the catalytic combustion device and the thermal storage combustion device is controlled, and the flow rate of the exhaust gas input into the thermal storage combustion device is slowed down, so that the combustion process in the catalytic combustion device and the thermal storage combustion device is carried out smoothly, and the fire prevention mechanism is used to prevent fire and cool the surrounding areas of the catalytic combustion device and the thermal storage combustion device, effectively reducing the high temperature risk during the use of the catalytic combustion device or the thermal storage combustion device.

[0028] Example 2

[0029] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0030] The pretreatment mechanism includes a fan A4 connected to the methanol recovery mechanism, a spray tower 5 connected to the fan A4, a desulfurization tower 6 connected to the spray tower 5, a denitrification device 7 connected to the denitrification device 7, a dechlorination device 8 connected to the denitrification device 7, and a dephosphorization device 9 connected to the catalytic combustion mechanism from the dechlorination device 8.

[0031] In this embodiment 2, the bag filter 2 is used to remove particulate matter in the tail gas. The vacuum pump 3 extracts the tail gas in the distillation tower 1. After the tail gas recovers methanol through the methanol recovery mechanism, it is pumped to the spray tower 5 through the fan A4. The water sprayed from the spray tower 5 dissolves and absorbs the water-soluble compounds in the tail gas. After that, the tail gas is desulfurized, denitrified, dechlorinated and dephosphorized in the desulfurization tower 6, the denitrification device 7, the dechlorination device 8 and the dephosphorization device 9 in turn to remove the inorganic harmful components in the tail gas, so as to facilitate the catalytic combustion mechanism to further process the tail gas.

[0032] Example 3

[0033] like Figure 1As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0034] The catalytic combustion mechanism includes a catalytic combustion device 15, and a fireproof pipe A25 connected between the pretreatment mechanism and the catalytic combustion device 15; the fireproof pipe A25 is provided with a first concentration detector 10, a humidity detector 12, a dehumidifier 13 and a fan B14 in sequence along the air flow direction thereof, and the fireproof pipe A25 is connected to a concentration regulating fan A11, which is located between the first concentration detector 10 and the humidity detector 12.

[0035] In this embodiment 3, the first concentration detector 10 is used to detect the concentration of combustible gas in the exhaust gas input into the catalytic combustion device 15, and preferably a suitable combustible gas concentration sensor is used. The humidity detector 12 is used to detect the exhaust gas humidity, and the dehumidifier 13 is used to control the exhaust gas humidity within the acceptable humidity range of the catalytic combustion device 15. The concentration regulating fan A11 is used to adjust the concentration of combustible gas in the exhaust gas, and by increasing the air volume, the concentration of combustible gas in the exhaust gas is reduced, which is conducive to the smooth combustion process in the catalytic combustion device 15.

[0036] Example 4

[0037] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0038] The catalytic combustion mechanism includes a catalytic combustion device 15, and a fireproof pipe A25 connected between the pretreatment mechanism and the catalytic combustion device 15; the fireproof pipe A25 is provided with a first concentration detector 10, a humidity detector 12, a dehumidifier 13 and a fan B14 in sequence along the air flow direction thereof, and the fireproof pipe A25 is connected to a concentration regulating fan A11, which is located between the first concentration detector 10 and the humidity detector 12.

[0039] The heat storage combustion mechanism includes a fireproof pipe B33 connected from the catalytic combustion device 15, a buffer tank 20 connected from the fireproof pipe B33, a fireproof pipe C34 connected from the buffer tank 20, a heat storage combustion device 21 connected from the fireproof pipe C34, and a fireproof pipe D35 connected from the heat storage combustion device 21.

[0040] Example 5

[0041] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0042] The catalytic combustion mechanism includes a catalytic combustion device 15, and a fireproof pipe A25 connected between the pretreatment mechanism and the catalytic combustion device 15; the fireproof pipe A25 is provided with a first concentration detector 10, a humidity detector 12, a dehumidifier 13 and a fan B14 in sequence along the air flow direction thereof, and the fireproof pipe A25 is connected to a concentration regulating fan A11, which is located between the first concentration detector 10 and the humidity detector 12.

[0043] The heat storage combustion mechanism includes a fireproof pipe B33 connected from the catalytic combustion device 15, a buffer tank 20 connected from the fireproof pipe B33, a fireproof pipe C34 connected from the buffer tank 20, a heat storage combustion device 21 connected from the fireproof pipe C34, and a fireproof pipe D35 connected from the heat storage combustion device 21.

[0044] The fireproof pipe B33 is provided with a first water curtain cabinet 16, a second concentration detector 17 and a fan D18 in sequence along the airflow direction, and the fireproof pipe B33 is connected with a concentration regulating fan B19 located between the second concentration detector 17 and the fan D18.

[0045] In this embodiment 5, the first water curtain cabinet 16 is used to remove the acid gas generated in the catalytic combustion device 15, and the second concentration detector 17 is used to detect the concentration of combustible gas in the tail gas input into the thermal storage combustion device 21. The concentration regulating fan B19 is used to adjust the concentration of combustible gas in the tail gas, and by increasing the air volume, the concentration of combustible gas input into the catalytic combustion device 15 is reduced, which is conducive to the smooth combustion in the catalytic combustion device 15. The buffer tank 20 is used to buffer the tail gas, slow down the tail gas flow rate, and ensure the smooth combustion process in the catalytic combustion device 15.

[0046] Example 6

[0047] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0048] The catalytic combustion mechanism includes a catalytic combustion device 15, and a fireproof pipe A25 connected between the pretreatment mechanism and the catalytic combustion device 15; the fireproof pipe A25 is provided with a first concentration detector 10, a humidity detector 12, a dehumidifier 13 and a fan B14 in sequence along the air flow direction thereof, and the fireproof pipe A25 is connected to a concentration regulating fan A11, which is located between the first concentration detector 10 and the humidity detector 12.

[0049] The heat storage combustion mechanism includes a fireproof pipe B33 connected from the catalytic combustion device 15, a buffer tank 20 connected from the fireproof pipe B33, a fireproof pipe C34 connected from the buffer tank 20, a heat storage combustion device 21 connected from the fireproof pipe C34, and a fireproof pipe D35 connected from the heat storage combustion device 21.

[0050] The fireproof pipe D35 is provided with a fan E22 and a second water curtain cabinet 23 in sequence along the airflow direction.

[0051] In the present embodiment 6, the second water curtain cabinet 23 is used to remove the acid gas generated by combustion in the thermal storage combustion device 21 , and the gas output from the thermal storage combustion device 21 can be directly discharged after being processed by the second water curtain cabinet 23 .

[0052] Example 7

[0053] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0054] The catalytic combustion mechanism includes a catalytic combustion device 15, and a fireproof pipe A25 connected between the pretreatment mechanism and the catalytic combustion device 15; the fireproof pipe A25 is provided with a first concentration detector 10, a humidity detector 12, a dehumidifier 13 and a fan B14 in sequence along the air flow direction thereof, and the fireproof pipe A25 is connected to a concentration regulating fan A11, which is located between the first concentration detector 10 and the humidity detector 12.

[0055] The heat storage combustion mechanism includes a fireproof pipe B33 connected from the catalytic combustion device 15, a buffer tank 20 connected from the fireproof pipe B33, a fireproof pipe C34 connected from the buffer tank 20, a heat storage combustion device 21 connected from the fireproof pipe C34, and a fireproof pipe D35 connected from the heat storage combustion device 21.

[0056] The fire prevention mechanism includes a fire arresting mechanism and a cooling mechanism for cooling the gas in the fire prevention pipe A25, the fire prevention pipe B33, the fire prevention pipe C34 and the fire prevention pipe D35 respectively; one of the fire arresting mechanisms is provided on the fire prevention pipe A25, the fire prevention pipe B33, the fire prevention pipe C34 and the fire prevention pipe D35 respectively.

[0057] In this embodiment 7, the fire-blocking mechanism on the fire-blocking tube A25 is located between the fan B14 and the catalytic combustion device 15, the fire-blocking mechanism on the fire-blocking tube B33 is located between the catalytic combustion device 15 and the first water curtain cabinet 16, and the fire-blocking mechanism on the fire-blocking tube D35 is located between the heat storage combustion device 21 and the fan E22.

[0058] Example 8

[0059] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0060] The catalytic combustion mechanism includes a catalytic combustion device 15, and a fireproof pipe A25 connected between the pretreatment mechanism and the catalytic combustion device 15; the fireproof pipe A25 is provided with a first concentration detector 10, a humidity detector 12, a dehumidifier 13 and a fan B14 in sequence along the air flow direction thereof, and the fireproof pipe A25 is connected to a concentration regulating fan A11, which is located between the first concentration detector 10 and the humidity detector 12.

[0061] The heat storage combustion mechanism includes a fireproof pipe B33 connected from the catalytic combustion device 15, a buffer tank 20 connected from the fireproof pipe B33, a fireproof pipe C34 connected from the buffer tank 20, a heat storage combustion device 21 connected from the fireproof pipe C34, and a fireproof pipe D35 connected from the heat storage combustion device 21.

[0062] The fire prevention mechanism includes a fire arresting mechanism and a cooling mechanism for cooling the gas in the fire prevention pipe A25, the fire prevention pipe B33, the fire prevention pipe C34 and the fire prevention pipe D35 respectively; one of the fire arresting mechanisms is provided on the fire prevention pipe A25, the fire prevention pipe B33, the fire prevention pipe C34 and the fire prevention pipe D35 respectively.

[0063] The fire-blocking mechanism includes a first air valve 26, a flame arrester 27 and a second air valve 28 which are respectively arranged on the fire-blocking pipe A25, the fire-blocking pipe B33, the fire-blocking pipe C34 or the fire-blocking pipe D35. The first air valve 26, the flame arrester 27 and the second air valve 28 are sequentially distributed along the air flow direction of the fire-blocking pipe A25, the fire-blocking pipe B33, the fire-blocking pipe C34 or the fire-blocking pipe D35.

[0064] In summary, in this embodiment 8, the first gas valve 26, the flame arrester 27 and the second gas valve 28 all have the function of isolating the flame, which is beneficial to improving the safety of the catalytic combustion device 15 or the heat storage combustion device 21.

[0065] Example 9

[0066] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0067] The catalytic combustion mechanism includes a catalytic combustion device 15, and a fireproof pipe A25 connected between the pretreatment mechanism and the catalytic combustion device 15; the fireproof pipe A25 is provided with a first concentration detector 10, a humidity detector 12, a dehumidifier 13 and a fan B14 in sequence along the air flow direction thereof, and the fireproof pipe A25 is connected to a concentration regulating fan A11, which is located between the first concentration detector 10 and the humidity detector 12.

[0068] The heat storage combustion mechanism includes a fireproof pipe B33 connected from the catalytic combustion device 15, a buffer tank 20 connected from the fireproof pipe B33, a fireproof pipe C34 connected from the buffer tank 20, a heat storage combustion device 21 connected from the fireproof pipe C34, and a fireproof pipe D35 connected from the heat storage combustion device 21.

[0069] The fire prevention mechanism includes a fire arresting mechanism and a cooling mechanism for cooling the gas in the fire prevention pipe A25, the fire prevention pipe B33, the fire prevention pipe C34 and the fire prevention pipe D35 respectively; one of the fire arresting mechanisms is provided on the fire prevention pipe A25, the fire prevention pipe B33, the fire prevention pipe C34 and the fire prevention pipe D35 respectively.

[0070] The cooling mechanism includes a sprayer 24 for spraying water mist on the outer tube walls of the fireproof tube A25, the fireproof tube B33, the fireproof tube C34 and the fireproof tube D35 for cooling.

[0071] In this embodiment 9, during the use of the catalytic combustion device 15 or the thermal storage combustion device 21, the sprayer 24 sprays water mist into the gas pipeline and the surrounding air environment around the catalytic combustion device 15 or the thermal storage combustion device 21, thereby reducing the ambient temperature of the catalytic combustion device 15 or the thermal storage combustion device 21, which is beneficial to improving the safety of the use of the catalytic combustion device 15 or the thermal storage combustion device 21. The sprayer 24 is externally connected to a water pump and a water source. After the water pump pumps the water from the source into the sprayer 24, the sprayer 24 turns the water into water mist and sprays it out.

[0072] Example 10

[0073] like Figure 1 As shown, the utility model provides a biodiesel exhaust combustion system, including a recovery mechanism connected to a distillation tower 1 for exhaust gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, the recovery mechanism includes a bag filter 2 connected to the distillation tower 1, a vacuum pump 3 connected to the bag filter 2, and a methanol recovery mechanism connected from the vacuum pump 3 and connected to the pretreatment mechanism.

[0074] The methanol recovery mechanism includes a primary condenser 29 connected to the vacuum pump 3, a primary recovery tank 30 connected to the primary condenser 29, a secondary condenser 31 connected to the primary recovery tank 30, and a secondary recovery tank 32 connected to the secondary condenser 31; the secondary recovery tank 32 is connected to the pretreatment mechanism.

[0075] In this embodiment 10, the primary condenser 29 and the secondary condenser 31 are both used to condense methanol in the tail gas, and the primary recovery tank 30 and the secondary recovery tank 32 are used to recover the condensed methanol to avoid wasting methanol.

[0076] The utility model comprises a distillation tower 1, a bag filter 2, a vacuum pump 3, a fan A4, a spray tower 5, a desulfurization tower 6, a denitrification device 7, a dechlorination device 8, a dephosphorization device 9, a first concentration detector 10, a humidity detector 12, a concentration regulating fan A11, a dehumidifier 13, a fan B14, a catalytic combustion device 15, a first water curtain cabinet 16, a second concentration detector 17, a fan D18, a concentration regulating fan B19, a thermal storage combustion device 21, a fan E22, a second water curtain cabinet 23, and a sprayer 24. , the first air valve 26, the flame arrester 27, the second air valve 28, the primary condenser 29, and the secondary condenser 31 are all existing known electrical equipment and can be directly purchased and used on the market. Regarding the distillation tower 1, the bag filter 2, the vacuum pump 3, the fan A4, the spray tower 5, the desulfurization tower 6, the denitrification device 7, the dechlorination device 8, the dephosphorization device 9, the first concentration detector 10, the humidity detector 12, the concentration adjustment fan A11, the dehumidifier 13, the fan B14, the catalytic combustion device 15, the first water curtain cabinet 16, the second concentration detector 17, the fan D18, the concentration adjustment fan B19, the heat storage combustion device 21, the fan E22, the second water curtain cabinet 23, the sprayer 24, the first air valve 26, the flame arrester 27, the second air valve 28, the primary condenser 29, the secondary condenser 31 The structure, circuit, and control principle are all existing known technologies. Therefore, the distillation tower 1, the bag filter 2, the vacuum pump 3, the fan A4, the spray tower 5, the desulfurization tower 6, the denitrification device 7, the dechlorination device 8, the dephosphorization device 9. The structures, circuits, and control principles of the first concentration detector 10, the humidity detector 12, the concentration adjusting fan A11, the dehumidifier 13, the fan B14, the catalytic combustion device 15, the first water curtain cabinet 16, the second concentration detector 17, the fan D18, the concentration adjusting fan B19, the heat storage combustion device 21, the fan E22, the second water curtain cabinet 23, the sprayer 24, the first air valve 26, the flame arrester 27, the second air valve 28, the primary condenser 29, and the secondary condenser 31 are not described in detail here.

[0077] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, rather than limiting it, and certainly not limiting the patent scope of the present invention; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention; that is to say, any changes or embellishments made to the main design concept and spirit of the present invention that have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention; in addition, the direct or indirect application of the technical solution of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. A biodiesel tail gas combustion system, characterized in that: The invention comprises a recovery mechanism connected to a distillation tower (1) for tail gas generated by biodiesel production, a pretreatment mechanism connected to the recovery mechanism, a catalytic combustion mechanism connected to the pretreatment mechanism, and a heat storage combustion mechanism connected to the catalytic combustion mechanism; both the catalytic combustion mechanism and the heat storage combustion mechanism are provided with a fire prevention mechanism, and the recovery mechanism comprises a bag filter (2) connected to the distillation tower (1), a vacuum pump (3) connected to the bag filter (2), and a methanol recovery mechanism connected to the pretreatment mechanism from the vacuum pump (3).

2. A biodiesel exhaust combustion system according to claim 1, characterized in that: The pretreatment mechanism includes a fan A (4) connected to the methanol recovery mechanism, a spray tower (5) connected to the fan A (4), a desulfurization tower (6) connected to the spray tower (5), a denitrification device (7) connected to the denitrification device (7), a dechlorination device (8) connected to the denitrification device (7), and a dephosphorization device (9) connected to the catalytic combustion mechanism from the dechlorination device (8).

3. A biodiesel tail gas combustion system according to claim 1, characterized in that: The catalytic combustion mechanism comprises a catalytic combustion device (15), and a fireproof pipe A (25) connected between the pretreatment mechanism and the catalytic combustion device (15); the fireproof pipe A (25) is provided with a first concentration detector (10), a humidity detector (12), a dehumidifier (13) and a fan B (14) in sequence along the airflow direction thereof; the fireproof pipe A (25) is connected with a concentration regulating fan A (11), and the concentration regulating fan A (11) is located between the first concentration detector (10) and the humidity detector (12).

4. A biodiesel tail gas combustion system according to claim 3, characterized in that: The heat storage combustion mechanism comprises a fireproof pipe B (33) connected from the catalytic combustion device (15), a buffer tank (20) connected from the fireproof pipe B (33), a fireproof pipe C (34) connected from the buffer tank (20), a heat storage combustion device (21) connected from the fireproof pipe C (34), and a fireproof pipe D (35) connected from the heat storage combustion device (21).

5. A biodiesel tail gas combustion system according to claim 4, characterized in that: A first water curtain cabinet (16), a second concentration detector (17) and a fan D (18) are sequentially arranged on the fireproof pipe B (33) along the airflow direction. A concentration regulating fan B (19) located between the second concentration detector (17) and the fan D (18) is connected to the fireproof pipe B (33).

6. A biodiesel tail gas combustion system according to claim 4, characterized in that: A fan E (22) and a second water curtain cabinet (23) are sequentially arranged on the fireproof pipe D (35) along the airflow direction.

7. A biodiesel tail gas combustion system according to claim 4, characterized in that: The fire prevention mechanism comprises a fire arresting mechanism and a cooling mechanism for cooling the gas in the fire prevention pipe A (25), the fire prevention pipe B (33), the fire prevention pipe C (34) and the fire prevention pipe D (35). The fire arresting mechanism is provided on each of the fire prevention pipes A (25), the fire prevention pipes B (33), the fire prevention pipes C (34) and the fire prevention pipes D (35).

8. A biodiesel tail gas combustion system according to claim 7, characterized in that: The fire arresting mechanism comprises a first gas valve (26), a flame arrester (27) and a second gas valve (28) which are respectively arranged on the fireproof pipe A (25), the fireproof pipe B (33), the fireproof pipe C (34) or the fireproof pipe D (35); the first gas valve (26), the flame arrester (27) and the second gas valve (28) are sequentially arranged along the airflow direction of the fireproof pipe A (25), the fireproof pipe B (33), the fireproof pipe C (34) or the fireproof pipe D (35).

9. A biodiesel tail gas combustion system according to claim 7 or 8, characterized in that: The cooling mechanism comprises a sprayer (24) for spraying water mist on the outer tube walls of the fireproof tube A (25), the fireproof tube B (33), the fireproof tube C (34) and the fireproof tube D (35) to cool them down.

10. The biodiesel tail gas combustion system according to claim 1, characterized in that: The methanol recovery mechanism comprises a primary condenser (29) connected to the vacuum pump (3), a primary recovery tank (30) connected to the primary condenser (29), a secondary condenser (31) connected to the primary recovery tank (30), and a secondary recovery tank (32) connected to the secondary condenser (31); the secondary recovery tank (32) is connected to the pretreatment mechanism.

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