Energy-saving device for enzyme catalytic reaction

Abstract

The utility model discloses an energy-saving device for enzyme catalytic reaction, which comprises an esterification reaction tank, a plurality of vertical pipes are symmetrically arranged on the inner wall of the esterification reaction tank, each vertical pipe is provided with a plurality of venturi nozzles from top to bottom, and the included angle between the venturi nozzles close to the tops of the vertical pipes and the inner wall of the esterification reaction tank is 20-50 degrees. The top of each vertical pipe is in a closed state, the bottom of each vertical pipe is communicated through an annular pipeline, the annular pipeline extends out of the esterification reaction tank to be connected with an outlet of a circulating pump, an inlet of the circulating pump is divided into two branches, one branch is communicated with the bottom of the esterification reaction tank, and the other branch is communicated with the bottom of the esterification reaction tank. And the other branch is connected with a feeding pipeline. Compared with the prior art, the utility model adopts the Venturi nozzle to realize strong dead-angle-free jet flow, so that not only is the mixing efficiency of esterification reaction enhanced, the esterification reaction is carried out more fully, and the methyl ester purity of crude methyl ester improved, but also the power required by the reaction is reduced, and the electric energy consumption is greatly saved.

Description

Technical Field

[0001] The utility model relates to the technical field of enzyme catalysis, in particular to an energy-saving device for enzyme catalysis reaction. Background Art

[0002] The enzymatic biodiesel production process uses methanol and oil to undergo a methylation reaction under the catalysis of biological enzymes to obtain crude methyl ester. The reaction principle is the same, but the actual process is quite different.

[0003] The traditional method of biodiesel esterification reaction is to use a reaction with a stirring device, the purpose is to achieve full contact reaction between methanol, catalyst and oil, but in the actual reaction process, there are the following disadvantages: ① The esterification reaction speed is fast in the initial stage of the reaction, but the effect is not obvious in the middle and late stages, and the reaction time is long. This is because in the middle and late stages of the esterification reaction, oil and methanol generate part of glycerin and water under the action of the catalyst, which reduces the contact interface between oil and methanol, deteriorates the mixing effect, and does not get a full reaction. ② The stirring reducer and the upper and lower bearings of the stirring shaft are easily damaged after long-term operation, and they need to be maintained, maintained and repaired frequently, that is, the investment and maintenance costs are high and the maintenance is difficult. ③ The original enzyme catalytic reaction relies on the stirring device to mix methanol, biological enzymes and oil through stirring, and the reaction is carried out at the liquid contact surface of the three. Because there is a dead angle in the reaction interface of the reactor, the esterification reaction is not sufficient. Moreover, in order to form a strong stirring vortex, the power of the stirring device needs to be increased, and the power consumption is high. For example, the stirring power of a 100 cubic meter reactor is 37kw, and the power of the circulation pump equipped after the improvement is 22kw, saving 15kw. Utility Model Content

[0004] In order to solve the above technical defects, the purpose of the utility model is to provide an energy-saving device for enzyme-catalyzed reaction, overcome the defects of the original mechanical stirring method, solve the technical problems of insufficient mixing, long reaction time, high energy consumption of mechanical stirring, large investment and high maintenance cost in the methyl esterification reaction of producing biodiesel by enzyme catalysis using high-acid value waste oil as raw material oil, and use a centrifugal circulation pump in conjunction with a Venturi nozzle to achieve a strong jet without dead angles, strengthen the mixing intensity of the esterification reaction, make the esterification reaction more sufficient, improve the methyl ester purity of crude methyl ester, reduce the power required for the reaction, and greatly save electricity consumption.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an energy-saving device for enzyme-catalyzed reaction, comprising an esterification reaction tank, wherein a plurality of risers are symmetrically arranged on the inner wall of the esterification reaction tank, and each riser is provided with a plurality of venturi nozzles from top to bottom, wherein the venturi nozzle arranged near the top of the riser is at an angle of 20-50 degrees to the inner wall of the esterification reaction tank, and the angles between the remaining venturi nozzles and the inner wall of the esterification reaction tank are all 70-80 degrees, the top of each riser is in a closed state, and the bottom is connected through an annular pipe, the annular pipe extends out of the esterification reaction tank and is connected to the outlet of a circulation pump, and the inlet of the circulation pump is divided into two branches, one branch is connected to the bottom of the esterification reaction tank, and the other branch is connected to a feed pipe.

[0006] Furthermore, the multiple Venturi nozzles arranged on the riser are evenly distributed in the length direction.

[0007] The circulation pump inlet and the circulation pump outlet are both provided with switch valves.

[0008] The principle of the Venturi nozzle adopted in the utility model is based on the Berboulli jet gravity principle, that is, the fluid is ejected from the conical nozzle at high speed, and a low-pressure area is formed around the guide port of the Venturi nozzle. Since the principle of the Venturi nozzle is that the regional pressure difference and the liquid momentum effect attract the liquid, the high-speed working jet and the attracted liquid enter the mixing and diffusion section and are ejected at a fluid output of 1:4, so that the solution is mixed and stirred without air. Therefore, a small circulation pump equipped with a Venturi nozzle can be used for large-capacity fluid circulation, and energy consumption in various aspects is saved. After the Venturi nozzle enters the working state under the pressure of the centrifugal pump, the solution sprays the liquid through the Venturi nozzle to achieve high-speed movement, so that the Venturi nozzle can form a low-pressure area through the exchange of fluid momentum, and the high-speed operation efficiency of the Venturi nozzle can also improve the overall work quality, so that the esterification reaction solution is forced to mix to achieve an air-free mixing and stirring state, which can also reduce the esterification reaction solution from contacting oxygen and oxidizing and decomposing. The Venturi nozzle can also promote the circulation system and turbulent movement of the solution, and improve the overall mixing effect of the solution. At the same time, the Venturi nozzle is not easy to damage and does not require frequent maintenance, care and overhaul.

[0009] The beneficial effects of the utility model are: changing the traditional method of using a stirring device to form a strong stirring vortex to achieve esterification reaction, and using a Venturi nozzle to achieve a strong jet without dead angles.

[0010] It not only enhances the mixing efficiency of the esterification reaction, makes the esterification reaction more fully carried out, and improves the purity of crude methyl ester, but also reduces the power required for the reaction, greatly saves electricity consumption, and has low investment and maintenance costs compared to the same reaction volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described in detail below with reference to the accompanying drawings and embodiments.

[0012] FIG1 is a schematic structural diagram of the utility model.

[0013] Figure 2 It is a structural schematic diagram of a Chinese Qiuli nozzle in the utility model.

[0014] Attached Figure 1 In the figure, 1. esterification reaction tank, 2. first venturi nozzle, 3. first venturi nozzle, 4. vertical pipe, 5. third venturi nozzle, 6. annular pipe, 7. circulation pump, 8. switch valve, 9. circulation pump inlet, 10. connecting feed pipe, 11. circulation pump outlet. DETAILED DESCRIPTION

[0015] Attached Figure 1 and Figure 2 The utility model is an embodiment of the utility model, which discloses an energy-saving device for enzyme catalytic reaction, comprising an esterification reaction tank 1, wherein two risers 4 are symmetrically arranged on the inner wall of the esterification reaction tank 1, and the two risers 4 are provided with a first venturi nozzle 2, a second venturi nozzle 3 and a third venturi nozzle 5 from top to bottom, and the first venturi nozzle 2, the second venturi nozzle 3 and the third venturi nozzle 5 arranged on each riser 4 are evenly arranged in the length direction; the first venturi nozzle 2 and the inner wall of the esterification reaction tank 1 have an angle of 45 degrees, and the second venturi nozzle 3, the third venturi nozzle 5 and the inner wall of the esterification reaction tank 1 have an angle of 75 degrees, the tops of the two risers 4 are closed, and the bottoms are connected through an annular pipe 6, the annular pipe 6 extends out of the esterification reaction tank 1 and is connected to the outlet of a circulation pump 7, the inlet of the circulation pump 7 is divided into two branches, one branch is connected to the bottom of the esterification reaction tank 1, and the other branch is connected to a feed pipe 10, and a switch valve 8 is provided at the inlet 9 and the outlet 11 of the circulation pump.

[0016] In the specific implementation, an esterification reaction tank is prepared, the diameter of the tank body is 4m, the height of the tank body is 9m, the tank body is a vertical cylinder, the upper and lower ends of the tank body are provided with spherical heads, the lower part of the tank body is provided with 4 legs, the height of the legs is 1.5m, two DN80 stainless steel risers (material: 304) with closed tops are symmetrically installed at a distance of 500mm from the inner wall of the tank body, the length of the steel pipe is 8m, and 3 Venturi nozzles are installed on each pipe. The installation position of the first Venturi nozzle on the top layer is: 2.4 meters downward from the top of the steel pipe, 45° upward and 20° off the center; the installation position of the second Venturi nozzle in the middle is: 2. 8 meters, 75° upward and 20° off center; the third Venturi nozzle at the bottom is installed at 2.8 meters downward from the nozzle installation position in the middle layer, at the root of the annular connection between the vertical pipe and the two steel pipes, 75° upward and 20° off center; the bottom of the two steel pipes are connected with a DN100 annular pipe with the same curvature as the pipe wall, a DN100 tee port is opened in the center of the annular pipe, and the DN100 pipe is connected to the outlet of the circulation pump. The center of the tank body is opened with a DN100 hole, which is connected to the inlet of the circulation pump, and valves are installed at the inlet and outlet of the circulation pump; the two steel pipes with Venturi nozzles are supported by the ribs led out from the inner wall of the tank body. The size of the static mixer jet inlet is DN80, and the size of the mixed flow outlet is DN60.

[0017] A discharge port is arranged at the bottom of the tank body, a reflux liquid inlet is arranged at the side of the tank body, a feed port, a discharge port and a breathing valve are arranged at the top of the tank body. The feed port is used for feeding, and the breathing valve is used for adjusting the pressure balance inside the tank body. The circulating pump model adopts a 100-125 horizontal explosion-proof centrifugal oil pump with a motor power of 11Kw.

[0018] A DN10 three-way hole is opened in the middle of the circulating pump outlet pipe and the annular pipe interconnected at the bottom of the two risers to ensure that the material pumped out of the circulating pump enters the two pipes with Venturi nozzles evenly after being buffered by the annular pipe, so that the mixed jet of each Venturi nozzle has a consistent flow rate at the nozzle.

[0019] If this application is put into use in the future, the power consumption of each reaction tank will be reduced from the original 22Kw to the current 11Kw, which saves 11Kw / h of electricity compared to mechanical stirring of each reaction tank. If it runs 24 hours a day and produces 300 days a year, it can save 11x24x300=79200 degrees of electricity. The average electricity cost per kilowatt-hour is 0.9 yuan, which can save 79200x0.9=71280 yuan.

[0020] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. An energy-saving device for enzyme catalytic reaction, comprising an esterification reaction tank, characterized in that: A plurality of risers are symmetrically arranged on the inner wall of the esterification reaction tank, and each riser is provided with a plurality of venturi nozzles from top to bottom, wherein the venturi nozzle arranged near the top of the riser is at an angle of 20-50 degrees to the inner wall of the esterification reaction tank, and the angles between the remaining venturi nozzles and the inner wall of the esterification reaction tank are all 70-80 degrees. The top of each riser is in a closed state, and the bottom is connected through an annular pipe, and the annular pipe extends out of the esterification reaction tank and is connected to the outlet of the circulation pump, and the inlet of the circulation pump is divided into two branches, one branch is connected to the bottom of the esterification reaction tank, and the other branch is connected to the feed pipeline.

2. The energy-saving device for enzyme catalytic reaction according to claim 1, characterized in that: The multiple Venturi nozzles arranged on the riser are evenly distributed in the length direction.

3. The energy-saving device for enzyme-catalyzed reaction according to claim 1, characterized in that: The circulation pump inlet and the circulation pump outlet are both provided with switch valves.

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