SU1055714A1 - Suction and delivery plant for pneumatic conveyance of bulk materials - Google Patents

Abstract

VSASYVLSCHE-DELIVERY SYSTEM FOR PNEVMOTRANSPORTNROVA LOOSE MATERIALS comprising Zab Noe device connected thereto a suction transport pipe discharge transport pipe with pereklyuchatesa Lemma flow, and the chamber, each of ikotoryh in its upper part is connected to a suction transportntsm conduit and a compressed air source, in the lower part, through the exhaust system, with the switch of the flow of the injection transport pipeline, in order to reduce the power consumption and, it is equipped with jet pumps installed on one-side outlet pipes of one and the other chambers with the possibility of their alternate communication with a source of compressed air and connected by pipelines with their suction cavities: the first with the upper part of the second chamber and the second with the upper part the first chamber, and the material level sensors in each chamber, each of these pipelines being equipped with a vacuum valve for communication with the atmosphere associated with the respective level sensor.

Description

The invention relates to the pneumatic conveying of raw materials and can be used in various sectors of the national economy, for example in agriculture, the chemical industry, for transporting mineral fertilizers, chemical melirants, cement, grain and its grinding products.

A known suction-injection unit for pneumatic conveying of bulk materials, comprising an intake device with a suction pipe connected to a precipitation chamber, equipped in the lower part with an unloading mechanism with an aeration chamber equipped with a transport pipeline, a jet pump connected to the suction cavity with the upper part of the precipitation chamber, a pressure cavity with an aeration chamber, and a check valve installed in the pipeline or in the opening connecting the suction cavity of the jet of the pump chamber 1 from coagulating.

The disadvantage of this design is low productivity, since the installation is made single-chamber, as well as the presence of a mechanism for unloading bulk material from the settling chamber to the aeration chamber limits the field of application of the installation and requires additional energy.

Thus, the implementation of the unloading mechanism in the form of a screw placed in a sleeve and having a non-return valve establishes limitations on the humidity and acidity of fertilizers. For transportation of granulated materials, for example granulated mineral fertilizers, pneumatic conveying installations with a screw unloading mechanism are suitable or ineffective, since the auger destroys up to 60% of the granules, and the nostril leaks from the aeration chamber to the precipitation reach 65%. Specific power to drive the auger unloading mechanism is significant and reaches 0.8-1.2 kW per ton of bulk material.

Other discharge mechanisms (sluice locks, centrifugal and valve, feeders, and others) also have disadvantages that limit the scope of possible use of a pneumatic conveyed installation and result in additional energy costs.

A suction-injection unit for pneumatic conveying of bulk materials is also known, comprising a suction device connected to it, a suction device; delivery pipeline

a transport pipeline with a flow switch, chambers, each of which in its upper part is connected to an aspirating transport pipeline and a source of compressed air and in their most part through an outlet nozzle with a flow switch of the delivery transport pipeline 2.

The disadvantage of this installation is high energy consumption, due to the use in it, in addition to the compressor for supplying compressed air, also a device for creating a vacuum in the chambers.

The aim of the invention is to reduce energy consumption.

This goal is achieved by the fact that a suction-injection unit for pneumatic conveying of bulk materials, comprising an intake device, an intake transport pipeline connected to it, an injection transport pipeline, with an i-flow switch, and a chamber each of which in its upper part is connected to suction pipe and with a source of compressed air, in the lower part through the outlet pipe - with a flow switch of the delivery transport pipeline, is equipped with jet pumps installed one at a time on the outlet connections of one and the other chambers with the possibility of alternately communicating them with a source of compressed air and connected by pipelines with their suction cavities: the first with the upper part of the second chamber and the second with the upper part of the first chamber, and material level sensors in each chamber, each of these pipelines being equipped with a vacuum valve for communication with the atmosphere associated with a respective level sensor.

FIG. 1 shows the proposed installation, top view; in Fig.2 a longitudinal section of the camera at the time of loading; in fig. 3 - the same in terms of unloading material.

The installation contains an intake device 1, suction unit TE connected to it, an assembly pipe 2, a discharge transport pipe | a wire 3 with a flow switch 4 and chambers 4 and 5. Each chamber in its upper part is connected to a pipe 2 branching into ends in chambers 5 and 6 and have valves 7 and 8, respectively, at the outlet. Each chamber in its upper part is connected to a source of compressed air (not shown), and in the lower part, through outlet pipes 9 and 10, respectively, with a flow switch 4 3. boprovoda vtusknom pipe 9 camera 5 is mounted a jet pump 11, vsasshayuschay cavity & which is connected via pipeline 12 to the upper part of chamber 6, and on the outlet 10 of chamber 6 there is installed a jet pump 13, the intake cavity 6 of which is connected via pipeline 14

the upper part of the chamber 5. Jet pumps 11 and 13 are connected by pneumatic lines 15 and 16, respectively, to a pneumatic actuator 17 for supplying compressed air from a source through a switch 18, providing alternate communication of the pump with a source of compressed air, in the upper part of the chambers

5 and 6, respectively, a material level sensor 19 is connected to a vacuum valve 20 mounted on line 14. and a material level sensor 21 connected to a vacuum valve 22 mounted on line 12. at the bottom of the chambers. 5 and b are installed aerating devices, respectively, 23 and 24. On the pipe 12 is installed a check valve 25 and valve 26, and on the pipe 14 is installed a check valve 27 and valve 28. Valves 26 and 28 and the switch 18 act on the actuator 29, and the air lines 15 and 16 are connected to the aerating devices 23 and 24 through the regulator, the calibration valves 30 and 31, and the upper part of each chamber through the regulator. drilling valves 32 and 33. The intake is powered by actuator 34,

Installation works the way.

A command is sent to the drive mechanism of the flow switch 4 to connect the chamber 5 to the transport pipeline 3. In this case, the chamber 6 is isolated from the latter. Using the actuator 29, the valves 26 and 28 and the switch 18 are installed in a position in which the pipeline 12 is open, the pipeline 14 is closed, and the compressed air flows through the pneumatic lines 15 and 17 to the nozzle of the jet pump 11, the aeration device 23 and to the upper part of the chamber 5 The valve 7 closes the nozzle of the suction pipe 2, which ends in the chamber 5. Under the action of a vacuum that transfers from the suction cavity of the jet pump 11 through the pipe 12 to the chamber 5, the valve 8 opens and the suction pipe 2 communicates with the chamber 6. pipeline 2 along with

atmospheric LEM is sucked in bulk material, continuously supplied by the intake device 1 (Fig. 2). When chamber b is filled with bulk material, the material level sensor 21 commands the valve actuator 22. The latter informs pipeline 12 with the atmosphere. The pressure in the chamber b is up to atmospheric and the flow of material into it stops. At the same time, a command is given to the mechanisms for actuating the valves 26 and 28 and the switches 4 and 18. By this command, chamber b communicates with transport pipeline 3 and chamber 5

5 is isolated from it, the valve 28 from K 1 is connected to the pipe 14, the valve 26 closes the pipe 12, the pneumatic line 17 communicates with the pneumatic line 16 and the compressed air enters

0 to the nozzle of the jet pump 13 ,. aerating device 24 and in the upper part of the chamber b. Under the action of air pressure, the valve 8 is closed and the bulk material; served in trans5. tailor pipeline 3..

 Vacuum from the suction cavity, jet pump bb 13 is passed through conduit 14 to chamber 5. Under vacuum, valve 7 opens and bulk material entrained in intake air through pipe 2 fills chamber 5. When chamber 5 is filled, level sensor 19 the material commands the actuator valve 20 and the conduit 14 communicates with the atmosphere. The pressure in chamber 5 is relieved to atmospheric and the flow of bulk material into it ceases. At the same time, a command is supplied to the drive mechanisms of the valves 26 and 28 and the switches 4 and 18. After this command, the pneumatic system is set in a position that ensures the discharge of bulk material from section 5 of measure 5 to the transport pipeline 3 and simultaneously loads chamber 6, i.e. then the cycle repeats. (The proposed design of the installation allows to reduce its power consumption,

0 as compared with the known two-chamber suction-injection devices, since there is no additional device for creating a vacuum in the chambers and

5, there is no additional device for transferring material from the low pressure zone to the high pressure zone, which also consumed energy in the drive.

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Claims (1)

'SASAYVITICE-DISPRESSING INSTALLATION FOR PNEUMOTORING OF BULK MATERIALS, comprising a suction device, a suction transport pipe connected to it, a discharge transport pipe with a flow switch, and chambers, each of which in its upper part is connected to a suction transport source with a compressed air pipeline and , in the lower part through the exhaust pipe FK - with a flow switch of the discharge transport pipeline, characterized in that, in order to reduce energy intensity, It is equipped with a jet pump mounted on one-on exhaust nozzles of one and the other chambers to be alternatively posts them to a compressed air source and connected through _a labor-boprovodov its suction <g cavities: the first - with the top of the second chamber, and the second - with the upper part of the first chamber, and material level sensors in each chamber, and each of these pipelines is equipped with a vacuum valve for communication with the atmosphere associated (with the corresponding level sensor.