A centralized washing and feeding system for pellet silos

Abstract

The present invention discloses a centralized elution feeding system for pellet silos, including: a plurality of pellet packaging silos and a dust removal system. The present invention realizes the simultaneous operation of one or more elutriators, reduces the configuration of equipment, saves investment and maintenance costs, and reduces energy consumption; realizes the function of continuously and evenly feeding different forms of packaging devices, can meet the diversified and complex needs, and provides a guarantee for the needs of new factories for high-tech equipment; can meet the simultaneous operation of one or more packaging lines, and improve production efficiency.

Description

Technical Field

[0001] The invention relates to a centralized washing and feeding system for a granular material bin. Background Art

[0002] At present, the equipment scale in the coal chemical and petrochemical industries is developing towards large-scale and intensive development, especially for the production of polyolefin chemical products, such as the quality and packaging requirements of plastic particles are becoming more and more stringent, and the degree of automated operation is also getting higher and higher. Plastic particles cannot contain too much dust, otherwise it will cause unstable or unqualified quality of downstream products. Therefore, before packaging, the plastic particles must be washed to remove dust and wire drawing materials. Generally, polyolefin production plants are equipped with two or more packaging silos, and an independent washing system is set under the outlet of each silo. The investment and energy consumption are high, especially for devices with a large number of packaging silos, the disadvantages are particularly obvious. Most of the domestic polyolefin production plants are point-to-point packaging, for example, one packaging silo is for a small bag packaging machine. If large bag packaging or other packaging forms are required, it must be carried out under another packaging silo. It is impossible to meet the requirements of large bag packaging, small bag packaging, and container loading packaging at one packaging silo, that is, the so-called centralized packaging requirements, but with the improvement of technology, it will definitely develop in the direction of intensiveness in the future. Summary of the invention

[0003] The purpose of the present invention is to provide a centralized washing and feeding system for pellet silos in order to solve the above-mentioned problems, so as to realize the simultaneous operation of one or more washers, reduce the configuration of equipment, save investment and maintenance costs, and reduce energy consumption. It realizes the function of continuous and uniform feeding of different forms of packaging devices, can meet the diversified and complex needs, and can meet the simultaneous operation of one or more packaging lines to improve production efficiency.

[0004] The object of the present invention is achieved in that:

[0005] A centralized washing and feeding system for pellet silos of the present invention comprises:

[0006] Several pellet packaging silos, each of which has the following installed at its outlet along the pellet conveying direction:

[0007] A first manual slide valve;

[0008] - a first low material level indicator;

[0009] a first pneumatic slide valve;

[0010] - an elutriator for removing dust and wire drawing materials from granular materials;

[0011] A buffer hopper, on which a high material level meter, a material level transmitter and a second low material level meter are installed, wherein the material level transmitter is interlocked with the first pneumatic slide valve;

[0012] a second manual slide valve; and

[0013] A plurality of discharge pipelines connected to the second manual slide valve at one end and connected to the packaging and loading unit at the other end, each discharge pipeline being equipped with a second pneumatic slide valve; and

[0014] A dust removal system, the dust removal system comprising:

[0015] A dust collector provided with a differential pressure transmitter and a material level switch;

[0016] A rotary valve installed at the discharge port of the dust collector, the rotary valve being interlocked with a material level switch;

[0017] A waste container placed at the outlet of the rotary valve;

[0018] A centrifugal fan is connected to the dust collector via a pipeline and a first pneumatic butterfly valve and a pressure gauge are provided on the pipeline;

[0019] An elutriation air main pipe connected to the air inlet of the dust collector at one end is provided with at least one pressure regulating valve and a pressure transmitter interlocked with the pressure regulating valve. The elutriation air main pipe is connected to each exhaust port of the elutriator via an elutriation air branch pipe, and a second pneumatic butterfly valve and a manual butterfly valve are provided on the elutriation air branch pipe;

[0020] The above-mentioned centralized washing and feeding system for the granular material silo also includes a controller, which is used to control the opening and closing of the second pneumatic butterfly valve, control the opening of the first pneumatic slide valve, display the working status of the bag dust collector, control the opening of the pressure regulating valve and the opening of each second pneumatic slide valve according to the working status signals of the first low material level meter, the material level transmitter, the pressure difference transmitter, the pressure transmitter and the packaging and loading unit.

[0021] The controller in the above-mentioned pellet silo centralized washing and feeding system is a DCS or PLC controller.

[0022] The elutriator in the above-mentioned centralized elutriation and feeding system for pellet silos is an F-type elutriator, which includes an elutriator pellet inlet, an elutriator pellet outlet, an elutriator air inlet and an elutriator exhaust port.

[0023] The packaging and loading unit in the above-mentioned pellet silo centralized washing and feeding system includes at least one of a container truck loading system, a small bag packaging system, a large bag packaging system or a tank truck loading system.

[0024] Three discharge pipelines are arranged at the outlet of the second manual slide valve in the above-mentioned pellet silo centralized washing and feeding system.

[0025] The dust collector in the above-mentioned centralized washing and feeding system of the pellet silo is a bag dust collector.

[0026] In the above-mentioned centralized washing and feeding system for pellet silos, an automatic dust cleaning system is provided inside the dust collector.

[0027] A filter is installed at the other end of the washing air main pipe in the above-mentioned pellet silo centralized washing and feeding system.

[0028] The present invention enables one or more elutriators to work simultaneously, reduces equipment configuration, saves investment and maintenance costs, and reduces energy consumption; realizes the function of continuously and evenly feeding different forms of packaging devices, can meet diversified and complex needs, and provides a guarantee for the demand of new factories for high-tech equipment; can meet the simultaneous operation of one or more packaging lines, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an implementation mode of the centralized washing and feeding system of the pellet silo of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of the dust removal system of the present invention (excluding the washing air branch pipe);

[0031] Figure 3 It is a schematic diagram of the mechanism of the elutriator of the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] See also Figure 1 , the figure shows that the pellet silo centralized washing and feeding system of the present invention comprises:

[0034] Several pellet packaging bins 1, each of which has the following installed in sequence at its outlet along the pellet conveying direction:

[0035] A first manual sliding valve 2;

[0036] A first low material level meter 3;

[0037] A first pneumatic slide valve 4;

[0038] An elutriator 5, in the present invention, the elutriator is an F-type elutriator, which includes an elutriator granular material inlet 51, an elutriator granular material outlet 52, an elutriator air inlet 53 and an elutriator exhaust port 54;

[0039] A buffer hopper 6, on which a high material level meter 61, a material level transmitter 62 and a second low material level meter 63 are installed, wherein the material level transmitter 62 is interlocked with the first pneumatic slide valve 4;

[0040] a second manual slide valve 7; and

[0041] A plurality of discharge pipes 8 connected to the second manual slide valve 7 at one end, the outlets of which are connected to the packaging and loading unit 81, the packaging and loading unit 81 is selected from at least one of the container truck loading system 81a, the small bag packaging system 81b, the large bag packaging system 81c or the tank truck loading system 81d, each discharge pipe 8 is installed with a second pneumatic slide valve 82, and in this embodiment, three discharge pipes 8 are arranged at the outlet of each second manual slide valve 7;

[0042] A dust removal system 9, the dust removal system 9 comprises:

[0043] A dust collector 91, which is provided with a differential pressure transmitter 91a and a material level switch 91b. In this embodiment, the dust collector 91 is a bag dust collector, and an automatic dust cleaning system (not shown in the figure) is provided inside the dust collector 91;

[0044] A rotary valve 92 installed at the discharge port of the dust collector 91, the rotary valve 92 is interlocked with the material level switch 91b;

[0045] A waste bucket 93 placed at the outlet of the rotary valve 92;

[0046] A centrifugal fan 94 is connected to the dust collector 91 through a pipeline and a first pneumatic butterfly valve 94a and a pressure gauge 94b are provided on the pipeline;

[0047] An elutriation air main pipe 95 connected to the air inlet of the dust collector 91 at one end, a filter 95a installed at the other end, a pressure regulating valve 95b and a pressure transmitter 95c interlocked with the pressure regulating valve 95b installed on the elutriation air main pipe 95, the elutriation air main pipe 95 is connected to each elutriator exhaust port 54 through an elutriation air branch pipe 96, and a second pneumatic butterfly valve 96a and a manual butterfly valve 96b are installed on the elutriation air branch pipe 96; and

[0048] A controller 10, which is selected from a DCS or PLC controller, controls the first pneumatic slide valve 4, displays the working status of the bag filter 91 and controls the pressure regulating valve 95b according to the signals of the material level transmitter 62, the pressure difference transmitter 91a and the pressure transmitter 95c.

[0049] The controller 10 controls each second pneumatic slide valve 82 through the working status signal of the packaging and loading unit 81;

[0050] The controller 10 controls the opening and closing of the second pneumatic butterfly valve 96 a through the signal of the first low material level meter 3 .

[0051] In this example, there are three packaging silos 1, and the packaging and loading unit 81 includes a container truck loading system 81a, a small bag packaging system 81b, a large bag packaging system 81c or a tank truck loading system 81d. The controller 10 adopts a PLC automatic controller, and controls each discharge pipeline 8 according to the status signal of the container truck loading system 81a, the small bag packaging system 81b, the large bag packaging system 81c or the tank truck loading system 81d. A second pneumatic slide valve 82 is installed to realize fully automatic start and stop.

[0052] Use of the present invention:

[0053] First, the preparation work of the downstream systems of this system is completed, the small bag packaging system 81b and the large bag packaging system 81c are started, and the container loading system 81a and the tank truck loading system 81d are in place to receive the materials from the centralized feeding system of the present invention.

[0054] Open the second pneumatic slide valve 7 at the outlet of the buffer hopper 6 to keep the gravity flow pipeline supplying materials to the downstream systems unblocked; and ensure that all instruments and valves are in normal operating condition.

[0055] Open the first manual slide valve 2 at the outlet of the packaging silo 1 and the manual butterfly valve 95e at the exhaust port of the elutriator 5 to ensure that the gas pipeline and material pipeline of the elutriator 5 are unobstructed. Once the second manual slide valve 7 and the manual butterfly valve 95e are opened, they will no longer be closed except during inspection and maintenance; at the same time, ensure that all instruments are in normal operating condition.

[0056] First, start the bag filter 91 and the rotary valve 92 at the discharge port of the bag filter 91; after the bag filter 91 is started, its automatic dust cleaning system starts to spray and clean the filter bags. The bag filter 91 is provided with a differential pressure transmitter 91a to detect the pressure difference of the filter bags in real time online. If the pressure difference exceeds the set alarm value, the differential pressure transmitter 91a will send a signal and display the alarm status on the controller 10, alerting the operator to the need to inspect and maintain the bag filter 91. A rotary valve 92 is provided at the discharge port of the bag filter 91, and the collected dust is discharged into the waste bucket 93 through the rotary valve 92 at the discharge port. Since the rotary valve 92 has the dual functions of air locking and material discharge, it can ensure synchronous operation with the bag filter 91. The bag filter 91 is also provided with a material level switch 91b. When the material level in the cone bucket of the bag filter 91 is higher than the material level switch 91b, the material level switch 91b will send a signal, and an alarm signal will be displayed on the controller 10 to remind the operator to perform inspection and maintenance.

[0057] Then, the centrifugal fan 94 is started up again. After it operates normally, the second pneumatic butterfly valve 95d at the inlet of the centrifugal fan is opened to start supplying the corresponding elutriation air to the elutriator 5.

[0058] According to the requirements of the packaging silo 1 to be unloaded, the second pneumatic butterfly valve 96a of the exhaust port of the elutriator 5 corresponding to the packaging silo 1 is opened, and the pressure on the elutriation air main pipe 95 is adjusted to the elutriation standard through the pressure regulating valve 95b and the pressure transmitter 95c on the elutriation air, so as to achieve the air intake of each elutriator 5 to meet its working requirements;

[0059] The first pneumatic slide valve 4 at the outlet of the packaging silo 1 is opened, and the elutriator 5 starts feeding and elutriating the materials to realize the function of centralized elutriation;

[0060] After being washed, the material falls into the buffer hopper 6 of the centralized feeding system. Through the interlocking relationship between the material level transmitter 62 of the buffer hopper 6 and the first pneumatic slide valve 4 at the outlet of the packaging silo 1, the material level of the buffer hopper 6 is always higher than the height of each discharge port, ensuring that the supply to each downstream packaging and loading point is synchronous, uniform and continuous, and ultimately achieving the purpose of centralized feeding to each point.

[0061] After the washing air completes washing the pellets, the washed air containing dust is first filtered through a bag dust collector 91 under the suction action of a centrifugal fan 94, and the filtered dust is discharged into a waste bin 93 through a rotary valve 92 at the discharge port of the dust collector 91. The filtered air has reached the emission standard and is discharged on site.

[0062] Centralized washing and centralized unloading are interrelated to ensure that the material in the buffer hopper 6 is always at a stable material level, which not only ensures the centralized feeding to each receiving point downstream through the buffer hopper 6, but also avoids the overflow failure of the F-type washing device 5, which makes it impossible to complete the washing work.

[0063] The present invention enables one or more elutriators 5 to work simultaneously, reduces equipment configuration, saves investment and maintenance costs, and reduces energy consumption; taking a factory with three packaging silos 1 as an example, the centralized elutriation and feeding system of the present invention can reduce equipment investment by more than 50%; it realizes the function of continuously and evenly feeding different forms of packaging devices, can meet diversified and complex needs, and provides a guarantee for the new factory's demand for high-tech equipment; it can meet the simultaneous operation of one or more packaging lines and improve production efficiency.

[0064] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A centralized washing and feeding system for pellet silos, characterized in that: It includes: There are three pellet packaging silos, and the outlet of each silo is equipped with: A first manual slide valve; - a first low material level indicator; a first pneumatic slide valve; - an elutriator for removing dust and wire drawing materials from granular materials; a buffer hopper, on which a high material level meter, a material level transmitter and a second low material level meter are installed, wherein the material level transmitter is interlocked with the first pneumatic slide valve; a second manual slide valve; and Three discharge pipes connected to the second manual slide valve at one end and connected to the packaging and loading unit at the other end, each discharge pipe is equipped with a second pneumatic slide valve; as well as A dust removal system, the dust removal system comprising: A bag filter equipped with a differential pressure transmitter and a level switch; a rotary valve installed at the discharge port of the dust collector, the rotary valve being interlocked with the material level switch; a waste bucket placed at the outlet of the rotary valve; a centrifugal fan connected to the dust collector via a pipeline and the pipeline is provided with a first pneumatic butterfly valve and a pressure gauge; and An elutriation air main pipe connected to the air inlet of the dust collector at one end is provided with at least one pressure regulating valve and a pressure transmitter interlocked with the pressure regulating valve, the elutriation air main pipe is connected to each of the exhaust ports of the elutriator via an elutriation air branch pipe, and a second pneumatic butterfly valve and a manual butterfly valve are provided on the elutriation air branch pipe; The packaging and loading unit includes a container truck loading system, a small bag packaging system, a large bag packaging system and a tank truck loading system; It also includes a PLC controller, which is used to control the opening and closing of the second pneumatic butterfly valve, control the opening of the first pneumatic slide valve, display the working state of the bag filter, control the opening of the pressure regulating valve and the opening of each second pneumatic slide valve according to the working state signals of the first low material level meter, the material level transmitter, the pressure differential transmitter, the pressure transmitter and the packaging and loading unit; The PLC controller controls each of the discharge pipelines according to the status signal of the container truck loading system, the small bag packaging system, the large bag packaging system or the tank truck loading system, and the second pneumatic sliding valve is installed on each of the discharge pipelines to achieve fully automatic start and stop.

2. The pellet silo centralized washing and feeding system according to claim 1, characterized in that: The elutriator is an F-type elutriator, which includes an elutriator granular material inlet, an elutriator granular material outlet, an elutriator air inlet and an elutriator exhaust port.

3. The pellet silo centralized washing and feeding system according to claim 1, characterized in that: An automatic dust cleaning system is arranged inside the dust collector.

4. The pellet silo centralized washing and feeding system according to claim 1, characterized in that: A filter is installed at the other end of the washing air main pipe.

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