CN212051293U - Device for producing biodiesel by continuous transesterification of waste oil - Google Patents

Abstract

The utility model discloses a device for producing biodiesel by continuous ester exchange of waste oil, which comprises a 1# reaction kettle, a 1# precipitation kettle, a 2# reaction kettle and a 2# precipitation kettle which are connected in sequence by pipelines; the No. 1 reaction kettle is provided with a waste oil inlet, a catalyst inlet and a methanol inlet; catalyst feeding distribution discs, heating coils, stirring devices and temperature measuring ports are arranged in the two reaction kettles, and material passing ports are arranged at the bottoms of the two reaction kettles; the bottoms of the two settling kettles are both provided with a densimeter for automatic measurement and a glycerin outlet; the No. 2 reaction kettle is provided with a catalyst replenishing feed inlet; the side surface of the upper part of the 2# precipitation kettle is provided with a feed inlet which is connected with a feed passing port pipeline of the 2# reaction kettle, the other side surface of the 2# precipitation kettle is provided with a biodiesel outlet, and the middle upper part in the kettle is provided with a middle partition plate, so that the materials flow in a U shape in the 2# precipitation kettle to be beneficial to the separation and discharge of glycerol and biodiesel. The utility model has the characteristics of small investment, high automation level, good product quality and stability, low production cost and high conversion rate.

Description

Device for producing biodiesel by continuous transesterification of waste oil

technical field

The utility model relates to production equipment for producing biodiesel by utilizing waste grease, in particular to a device for producing biodiesel by continuous transesterification of waste grease.

Background technique

Domestic biodiesel production mainly uses waste oil as raw material, and waste oil is mainly a mixture of free fatty acids and glycerides, except for impurities such as water and sediment. After the waste oil is purified, esterification is generally used to convert free fatty acids into biodiesel and water. After separating the water generated by the reaction, glycerides are converted into biodiesel and glycerol through transesterification. The devices for producing biodiesel by transesterification mainly include reaction kettles and reaction towers. The existing problems are: the reaction kettle method is an intermittent production of biodiesel, which has problems such as high labor intensity and unstable quality; the reaction tower method uses high temperature and high pressure equipment and requires investment Large, high energy consumption, high operational requirements.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a device for producing biodiesel by continuous transesterification of waste oil with low investment, high automation level, good product quality and stability, low production cost and high conversion rate.

In order to achieve the above purpose, the device for producing biodiesel by continuous transesterification of waste grease of the present invention comprises 1# reaction kettle, 1# precipitation kettle, 2# reaction kettle, 2# sedimentation kettle and connecting pipeline; the top of the 1# reaction kettle There are waste grease inlet a, 1# reactor methanol inlet b and 1# reactor catalyst inlet c, and the side is provided with 1# reactor steam inlet g, 1# reactor steam condensate water outlet d and 1# reactor temperature measurement Port f, the bottom is provided with a 1# reaction kettle feeding port e; the kettle is provided with a catalyst feed distribution plate, a heating coil and a stirring device, and the catalyst distribution plate is conducive to the uniform addition of the catalyst into the reaction kettle to reduce the occurrence of side reactions The function of the heating coil is to adjust the temperature in the 1# reaction kettle to meet the set value by introducing steam to ensure the smooth progress of the transesterification reaction. The stirring device is conducive to the full reaction of waste grease and methanol under the action of a catalyst; the described The upper side of the 1# precipitation kettle is provided with a 1# precipitation kettle feeding port h and the 1# reaction kettle feeding port e is connected with the pipeline, the bottom is equipped with a density meter for automatic measurement and is provided with a 1# precipitation kettle glycerin outlet i, 1# The bottom side of the precipitation kettle is provided with a 1# precipitation kettle feeding port j; the upper side of the 2# reaction kettle is provided with a 2# reaction kettle feeding port l and a 1# precipitation kettle feeding port j pipeline connection, and the top is provided with 2# reactor catalyst feed port k, 2# reactor feed port n at the bottom, 2# reactor steam inlet p, 2# reactor steam condensate water outlet m and 2# reactor temperature measuring port on the side o, a catalyst feed distribution plate, a steam coil and a stirring device are arranged in the kettle; the upper side of the 2# precipitation kettle is provided with a 2# precipitation kettle feeding port q and the 2# reaction kettle passing material port n pipeline is connected, There is a biodiesel outlet s on the other side, a density meter for automatic measurement at the bottom and a glycerin outlet r of the 2# precipitation kettle, and the middle and upper part of the kettle is equipped with a middle partition, so that the material is U-shaped in the 2# sedimentation kettle flow, which is beneficial to the separation and discharge of glycerol and biodiesel.

The device for producing biodiesel by continuous transesterification of waste grease of the utility model has the following technical features and beneficial effects:

①It realizes continuous feeding and discharging, which is conducive to automatic control, efficient production, and ensures the stability of production quality;

② Compared with the reaction kettle (batch method), it has the characteristics of simple operation and low labor intensity; compared with the high temperature and high pressure reaction tower, it has the advantage of low cost;

③During the production process, glycerol is continuously and automatically discharged, which is conducive to the generation of biodiesel and improves the conversion rate of transesterification.

④ Less investment and low maintenance cost.

Description of drawings

Fig. 1 is a schematic diagram of the device structure of the utility model for the continuous transesterification of waste oil and fat to produce biodiesel.

Fig. 2 is the enlarged structural schematic diagram of 1# reactor in Fig. 1.

Figure 3 is a schematic diagram of the enlarged structure of the 1# precipitation kettle in Figure 1 .

Fig. 4 is the enlarged structure schematic diagram of 2# reactor in Fig. 1.

Fig. 5 is the enlarged structural schematic diagram of 2# precipitation kettle in Fig. 1.

Reference signs: 1# reaction kettle 1, 1# precipitation kettle 2, 2# reaction kettle 3, 2# sedimentation kettle 4, density meter 5, middle partition 6, waste grease inlet a, 1# reaction kettle methanol inlet b, 1# reaction kettle catalyst inlet c, 1# reaction kettle steam condensate water outlet d, 1# reaction kettle feed port e, 1# reaction kettle temperature measurement port f, 1# reaction kettle steam inlet g, 1# precipitation kettle feed Port h, 1# precipitation kettle glycerin outlet i, 1# precipitation kettle feed port j, 2# reactor catalyst inlet k, 2# reactor feed port l, 2# reactor steam condensate water outlet m, 2# reaction The discharge port n of the kettle, the temperature measuring port o of the 2# reaction kettle, the steam inlet p of the 2# reaction kettle, the feeding port q of the 2# precipitation kettle, the glycerol outlet r of the 2# precipitation kettle, and the discharge port s of the 2# precipitation kettle.

Detailed ways

The device for producing biodiesel by continuous transesterification of waste oil and fat of the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Fig. 1-Fig. 5, the device for producing biodiesel by continuous transesterification of waste grease of the present invention comprises 1# reaction kettle 1, 1# precipitation kettle 2, 2# reaction kettle 3, 2# precipitation kettle 4 and connecting pipelines; The top of the 1# reactor 1 is provided with waste grease inlet a, 1# reactor methanol inlet b and 1# reactor catalyst inlet c, and the side is provided with 1# reactor steam inlet g, 1# reactor steam condensate water outlet d and 1# reaction kettle temperature measurement port f, the bottom is provided with 1# reaction kettle material feeding port e; the catalyst feed distribution plate, heating coil and stirring device are arranged in the kettle, and the catalyst distribution plate is conducive to the uniform addition of catalyst to the reaction In order to reduce the occurrence of side reactions in the kettle, the function of the heating coil is to adjust the temperature in the 1# reaction kettle 1 to meet the set value by introducing steam to ensure the smooth progress of the transesterification reaction. The stirring device is beneficial to waste grease and methanol. Fully react under the action of a catalyst; the upper side of the 1# precipitation kettle 2 is provided with a 1# precipitation kettle feed port h and the 1# reaction kettle 1 feed port e pipeline is connected, and the bottom is equipped with an automatically measured density meter 5 and There is a glycerin outlet i of the 1# precipitation kettle. Due to the high density of glycerin, it is deposited at the bottom of the 1# precipitation kettle 2. When the density reaches the set value, the glycerin is discharged from the glycerol outlet i of the 1# precipitation kettle by automatically opening the valve, and 1 #The bottom side of the precipitation kettle 2 is provided with a 1# precipitation kettle feeding port j; the upper side of the 2# reaction kettle 3 is provided with a 2# reaction kettle feeding port 1 and the 1# precipitation kettle feeding port j pipeline connection, The top is provided with a 2# reactor catalyst feed port k, the bottom is provided with a 2# reactor feed port n, and the side is provided with a 2# reactor steam inlet p, a 2# reactor steam condensate water outlet m and a 2# reactor The temperature measuring port o, the kettle is provided with a catalyst feed distribution plate, a steam coil and a stirring device, and its function is the same as that of the 1# reaction kettle 1; since part of the catalyst will be lost when the glycerol is discharged from the bottom of the 1# precipitation kettle 2, so 2 #Reaction kettle 3 needs supplementary catalyst. The upper side of the 2# sedimentation kettle 4 is provided with a 2# sedimentation kettle feed port q to be connected with a 2# reaction kettle feed port n pipeline, the other side is provided with a biodiesel outlet s, and the bottom is equipped with a density meter for automatic measurement There is also a glycerin outlet r of the 2# precipitation kettle. When the density reaches the set value, the valve will be automatically opened to make the 2# precipitation kettle glycerin discharged from r, and the biodiesel will be discharged from the biodiesel outlet s. The middle partition plate makes the material flow in a U-shape in the 2# precipitation kettle 4, which is beneficial to the separation and discharge of glycerol and biodiesel.

When in use, in order to ensure that the waste oil, methanol, catalyst and biodiesel and glycerol generated in the 1# reaction kettle 1 can smoothly flow into the 1# precipitation kettle 2, and then flow into the 2# reaction kettle 3, and finally In the 2# precipitation kettle 4, the liquid level of the 1# reaction kettle 1 is required to be 0.3-0.5 meters higher than the liquid level of the 1# sedimentation kettle 2, and the liquid level in the 1# sedimentation kettle 2 is higher than the liquid level of the 2# reaction kettle 3 The height is 0.3-0.5 meters, and the liquid level of the 2# reaction kettle 3 is 0.3-0.5 meters higher than the liquid level of the 2# precipitation kettle 4, so as to ensure a reasonable enough liquid level difference between adjacent kettles.

The specific operation process during production is as follows: the waste oil, methanol and catalyst after water separation generated by the esterification reaction are sent into the 1# reaction kettle 1, the stirring is turned on, steam is introduced into the heating coil, and the reaction is carried out at a certain temperature, Then the material flows from the bottom of the 1# reaction kettle 1 to the 1# precipitation kettle 2, and the glycerol generated by the reaction is automatically discharged through the density meter at the bottom of the 1# precipitation kettle 2, so as to break the original balance of the transesterification reaction and promote the reaction to generate biodiesel. The material flows from the bottom side of the 1# precipitation kettle 2 to the 2# reaction kettle 3, because the 1# precipitation kettle 2 will lose part of the catalyst when discharging glycerin, and the 2# reaction kettle 3 needs to be supplemented with catalyst. Continue the reaction; when the temperature does not meet the requirements, steam can be introduced into the heating coil to adjust the temperature to meet the set value; after the reaction, the material flows from the bottom of the 2# reaction kettle 3 to the 2# precipitation kettle 4 for precipitation Separation, glycerin is automatically discharged from the bottom of the 2# precipitation kettle 4 through a density meter, and the biodiesel flows out from the upper side of the 2# precipitation kettle 4.

Claims (1)

1. a device for producing biodiesel by continuous transesterification of waste grease, is characterized in that: it comprises 1# reaction still, 1# precipitation still, 2# reaction still, 2# precipitation still and connecting pipeline; Described 1# reaction still The top is provided with waste grease inlet a, 1# reactor methanol inlet b and 1# reactor catalyst inlet c, and the side is provided with 1# reactor steam inlet g, 1# reactor steam condensate water outlet d and 1# reactor The temperature measuring port f, the bottom is provided with a 1# reaction kettle feed port e; the catalyst is provided with a catalyst feed distribution plate, a heating coil and a stirring device, and the catalyst distribution plate is conducive to the uniform addition of the catalyst into the reaction kettle to reduce side reactions. The function of the heating coil is to adjust the temperature in the 1# reaction kettle to meet the set value by introducing steam to ensure the smooth progress of the transesterification reaction. The stirring device is conducive to the full reaction of waste grease and methanol under the action of a catalyst; The upper side of the 1# precipitation kettle is provided with a 1# precipitation kettle feeding port h and the 1# reaction kettle feeding port e pipeline is connected, the bottom is equipped with a density meter for automatic measurement and is provided with a 1# precipitation kettle glycerin outlet i, The bottom side of the 1# precipitation kettle is provided with a 1# precipitation kettle feeding port j; the upper side of the 2# reaction kettle is provided with a 2# reaction kettle feeding port l and the 1# precipitation kettle feeding port j pipeline connection, the top There is a 2# reactor catalyst feed port k, a 2# reactor feed port n at the bottom, a 2# reactor steam inlet p, a 2# reactor steam condensate water outlet m and a 2# reactor test on the side. Warm mouth o, catalyst feed distribution plate, steam coil and stirring device are arranged in the kettle; the upper side of the 2# precipitation kettle is provided with a 2# precipitation kettle feeding port q and a 2# reaction kettle feeding port n pipeline Connected, there is a biodiesel outlet s on the other side, a density meter for automatic measurement and a 2# precipitation kettle glycerin outlet r at the bottom, and a middle partition plate in the middle and upper part of the kettle, so that the material is in the 2# sedimentation kettle. U-shaped flow is beneficial to the separation and discharge of glycerol and biodiesel.

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