SU1669979A1 - Apparatus for cultivating microalgae - Google Patents

Abstract

This invention relates to the microbiological industry. The purpose of the invention is to increase productivity by providing a more stable temperature environment. The installation comprises a tubular flow photoreactor 1 for slurry, a medium recycling system including a flow booster, a heat exchanger and a gas exchanger. In the tube of the photoreactor 1, a device 5 is placed for changing the flow rate, comprising a plate 6 serving as a flap mounted on the shaft 7 with the possibility of changing its inclination. Plate 6 is connected to a flat thermo-bimetallic coil 8 through an adjusting drum 9. Shaft 7 is connected to a gas exchanger via a resistor 12. Maintaining a constant temperature of the medium occurs due to a change in the flow rate, which is automatically controlled by the plate 6. 3 Il.

Description

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The invention relates to the microbiological industry, to plants for the cultivation of microalgae, the biomass of which is used in animal feed.

The purpose of the invention is to increase productivity by providing a more stable temperature environment.

FIG. 1 shows the installation diagram; in fig. 2 — node I in FIG. 1, a longitudinal section; FIG. 3 shows section A-A in FIG. 2 (BB - horizontal plane)

The microalgae growing plant contains a tubular flow photoreactor 1 for slurry, a medium recirculation system including a flow rate booster 2, a heat exchanger U and a gas exchanger 4. In the tubular photoreactor 1 a device 5 is placed directly in the medium flow for varying the flow rate of the suspension depending on its temperature. The device 5 consists of a plate b, serving

damper and mounted on the shaft 7 with the ability to change its inclination relative to the horizontal plane BB, and connected with it a flat thermo-bimetallic spiral 8. one end of which is attached to the tube wall of the photoreactor 1. and the other end to the shaft 7 by means of an adjusting drum 9. fitted with retaining bolts 10. The coil 8 with the drum 9 is installed in the recess 11 of the wall of the photoreactor 1, outside the main flow of the medium, while the recess 11 serves as a sludge pit. The shaft 7 is provided with a resistor 12 electrically connected to an actuator (not shown) of the gas-exchange coefficient 4. Light sources 13 are placed around the photoreactor 1.

The installation works as follows.

The booster 2 of the suspension flow feeds the microalgae suspension into the heat exchanger 3, where its temperature is stabilized,

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and in the gas exchanger 4, where the slurry is enriched with carbon dioxide and air. After the gas exchanger 4, the microalgae slurry enters the photoreactor 1 and, as it passes through the device 5, returns to the flow stimulator 2. At the same time, the position of the plate 6 on the drum 9 can be adjusted so that it will create a hydraulic resistance, which in total with the resistance of the rest of the suspension path will correspond to its speed, which determines the optimum temperature of the suspension and, consequently, the performance of the installation under nominal lighting photoreactor 1.

With an increase in the temperature of the microalgae suspension, the curvature of the thermo-bimetallic coil 8 washed by the suspension increases in any part of its length, as a result of which the coil 8 twists more tightly, and since the length of the coil 8 does not decrease and even increases due to temperature lengthening, the inner portion of the coil 8 together with the drum 9 and the flap 6 advances relative to the shaft 7 at some angle D p, reducing the hydraulic resistance of the flap 6 to the flow of the microalgae suspension. Therefore, the flow of the suspension through the photoreactor 1 increases, and its temperature, respectively, decreases.

When the temperature of the suspension decreases, the reverse adjustment takes place.

The actuator of the gas exchanger 4 is controlled from the angle of rotation of the shaft 7 connected to the resistor 12, and a change in the gas saturation of the suspension in the gas exchanger 4 occurs.

Thus, the proposed plant allows continuous control of the temperature of the suspension, i.e. constantly maintaining it at an optimal level, which leads to

increase plant performance. In the normal mode, the adjustment is made only due to the automatic smooth action of the plate 6 on the speed of movement of the suspension, which allows extremely reduce fluctuations and deviations of the temperature of the suspension from its optimal value and, accordingly, increase the biomass yield of microalgae.

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Claims (1)

Invention Formula A microalgae growing plant containing a tubular slurry photoreactor, a recycling system medium, including a flow booster, a heat exchanger and a gas exchanger connected in series and connected to a photoreactor, characterized in that, in order to increase productivity by providing a more stable temperature environment, the installation contains a device for changing the speed of the flow of the suspension, depending on its temperature, placed inside the tubular photoreactor, consisting of a plate, tapering valve and mounted on the shaft with the possibility of changing its inclination relative to the horizontal plane, and connected to it a flat thermo-bimetallic spiral, one end of which is attached to the wall of the photoreactor tube, and the other to the shaft by means of an adjusting drum. eleven FIG. 2 PhagZ