High-pressure filtering device for discharging pump of polymeric kettle

Abstract

The utility model discloses a high-pressure filtering device for a discharging pump of a polymeric kettle, which comprises a first filter and a second filter which are connected in parallel, one filter is standby, the other filter is used, and audible and visual alarms are arranged on the first filter and the second filter; a first inlet stop valve and a first inlet pressure transmitter are sequentially arranged on an inlet pipeline of the first filter, and a first outlet pressure transmitter and a first outlet stop valve are sequentially arranged on an outlet pipeline of the first filter; an inlet pipeline of the second filter is sequentially provided with a second inlet stop valve and a second inlet pressure transmitter, and an outlet pipeline of the second filter is sequentially provided with a second outlet pressure transmitter and a second outlet stop valve; and the pressure transmitter, the stop valve and the audible and visual alarm are electrically connected with the PLC to realize interlocking. The two filters can be automatically switched under the condition that the two filters are blocked during operation, an alarm is given through the acousto-optic warning device, an operator is reminded to clean the blocked filters in time, and continuous operation of discharging and conveying of the polymerization kettle is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of chemical production equipment, in particular to a high-pressure filtering device for a polymerizer discharge pump. Background Art

[0002] During the polyvinyl chloride production process, a polymerization kettle is mainly used to add monomers, desalted water, and various auxiliary materials and small additives for reaction. The polyvinyl chloride slurry after the reaction is completed is transported to the subsequent stripping device through a discharge pump. After the residual vinyl chloride is removed, it enters the drying system for drying, air conveying and packaging.

[0003] During the PVC slurry transportation process, in order to prevent the blocky self-polymers in the polymerization kettle and mechanical impurities in the raw and auxiliary materials from entering the PVC finished product, resulting in poor quality of the resin finished product and affecting the quality of the subsequent resin processing products, it is usually necessary to install a discharge filter before the feed pump. During the operation of the device, the following problems often occur: (1) Before the polymerization kettle reaches the cleaning cycle, there are many self-polymers in the kettle and the filter is seriously clogged, requiring manual switching and cleaning. However, due to the lag of manual operation, the continuity and stability of the polymerization discharge are affected. Continuous discharge can ensure the continuity of the production process and is conducive to maintaining production quality. (1) The consistency of quality; usually, the material formed after the polymerization reaction is completed is viscous and heat-sensitive. If the discharge is discontinuous, it may cause excessive accumulation of materials in the kettle, increase the pressure in the kettle, and thus affect the safety and operational stability of the equipment; (2) The discharge filter is frequently blocked and needs to be manually switched, which is time-consuming and labor-intensive, and can easily lead to solidification and blockage of the polyvinyl chloride slurry. The polymerization product at high temperature will solidify rapidly after cooling. If the discharge is interrupted, solid blocks may form inside the pipes, valves, pumps and other equipment, causing equipment blockage, seriously affecting subsequent cleaning work, and may cause permanent damage to the equipment. Utility Model Content

[0004] The utility model provides a high-pressure filtering device for a polymerizer discharge pump, which ensures that the high-pressure filtering device can be automatically switched when the filter is blocked during operation, and at the same time, an alarm is issued through an audible and visual warning device to remind the operator to clean the filter in time, thereby ensuring that the polymerizer discharge and transportation can operate continuously.

[0005] To achieve its purpose, the utility model adopts the following technical solutions:

[0006] A high-pressure filtration device for a polymerizer discharge pump comprises a polymerizer, wherein the discharge port of the polymerizer is connected to the inlet of the discharge pump, and the high-pressure filtration device comprises two parallel-connected first and second filters, wherein the inlets of the first and second filters are connected to the outlet of the discharge pump, and the outlets are connected to the inlet of a discharge trough; the first and second filters are both provided with an audible and visual alarm, and the outlet pipe of the discharge pump is provided with a pressure transmitter;

[0007] The inlet pipe of the first filter is provided with a first inlet shut-off valve and a first inlet pressure transmitter in sequence, and the outlet pipe is provided with a first outlet pressure transmitter and a first outlet shut-off valve in sequence; the inlet pipe of the second filter is provided with a second inlet shut-off valve and a second inlet pressure transmitter in sequence, and the outlet pipe is provided with a second outlet pressure transmitter and a second outlet shut-off valve in sequence;

[0008] The pressure transmitter, the first inlet pressure transmitter, the second inlet pressure transmitter, the first outlet pressure transmitter and the second outlet pressure transmitter are respectively electrically connected to the signal input end of the PLC programmable controller in the central control computer, and the signal output end of the PLC programmable controller is respectively electrically connected to the discharge pump, the sound and light alarm, the first inlet shut-off valve, the second inlet shut-off valve, the first outlet shut-off valve and the second outlet shut-off valve.

[0009] Furthermore, the filter elements of the first filter and the second filter are made of stainless steel woven mesh or sintered mesh.

[0010] Furthermore, the mesh size of the filter in the filter element is 5-15 μm.

[0011] Furthermore, the first inlet shut-off valve, the first outlet shut-off valve, the second inlet shut-off valve and the second outlet shut-off valve are all high-pressure shut-off valves.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] The high-pressure filtration device provided by the utility model is arranged behind the discharge pump of the polymerization kettle, and includes two filters connected in parallel, one for backup and the other for use. In the event of a blockage in the running filter, it can be automatically switched. At the same time, an alarm is issued through an audible and visual warning device to remind the operator to clean the blocked filter in time, thereby ensuring that the discharge and transportation of the polymerization kettle can be continuously operated. The online switching can ensure the continuous operation of the equipment without frequent shutdown and restart, thereby improving the continuity and stability of the entire production process, increasing the overall production capacity, and helping to maintain the constant state of the materials in the kettle, including key parameters such as temperature, pressure, and material concentration, ensuring that the polymerization reaction is carried out under ideal conditions, which is conducive to the stable control of product quality, and can reduce the cost of unit products to a certain extent, thereby improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a high-pressure filter device for a polymerizer discharge pump of the present utility model;

[0015] In the figure: 1-polymerization kettle; 2-discharge pump; 3-discharge chute; 4-PLC programmable controller; 5-central control computer; 6-pressure transmitter; A-first filter; A1-first inlet shut-off valve; A2-first outlet shut-off valve; A3-first inlet pressure transmitter; A4-first outlet pressure transmitter; B-second filter; B1-second inlet shut-off valve; B2-second outlet shut-off valve; B3-second inlet pressure transmitter; B4-second outlet pressure transmitter. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] like Figure 1 As shown, the utility model is a high-pressure filtration device for a polymerizer discharge pump, comprising a polymerizer 1. The discharge pressure of the polymerizer 1 is generated by the reaction pressure of the polymerizer 1 itself. The discharge pipe of the polymerizer 1 is connected to the inlet of the discharge pump 2. The main function is to achieve timely delivery of the discharge slurry of the polymerizer 1. The high-pressure filtration device includes two parallel first filters A and second filters B, one for use and one for standby. The inlets of the first filters A and the second filters B are connected to the outlet of the discharge pump 2, and the outlets are connected to the inlet of the discharge trough 3. The discharge trough 3 temporarily stores the polyvinyl chloride slurry and then processes it in the next process. The filter elements of the first filter A and the second filter B are both made of stainless steel woven mesh with a mesh size of 15μm. The first filter A and the second filter B are both connected to an audible and visual alarm, and the outlet pipe of the discharge pump 2 is provided with a pressure transmitter 6.

[0018] The inlet pipe of the first filter A is sequentially equipped with a first inlet shut-off valve A1 and a first inlet pressure transmitter A3, and the outlet pipe is sequentially equipped with a first outlet pressure transmitter A4 and a first outlet shut-off valve A2. The inlet pipe of the second filter B is sequentially equipped with a second inlet shut-off valve B1 and a second inlet pressure transmitter B3, and the outlet pipe is sequentially equipped with a second outlet pressure transmitter B4 and a second outlet shut-off valve B2. The first inlet shut-off valve A1, the first outlet shut-off valve A2, the second inlet shut-off valve B1, and the second outlet shut-off valve B2 are all high-pressure shut-off valves, which offer high safety, strong reliability, rapid response, compact structure, and multiple operating modes, ensuring rapid, accurate valve switching.

[0019] The pressure transmitter 6, the first inlet pressure transmitter A3, the second inlet pressure transmitter B3, the first outlet pressure transmitter A4, and the second outlet pressure transmitter B4 are electrically connected to the signal input end of the PLC programmable controller 4 in the central control computer 5, respectively. The signal output end of the PLC programmable controller 4 is electrically connected to the discharge pump 2, the sound and light alarm, the first inlet shut-off valve A1, the second inlet shut-off valve B1, the first outlet shut-off valve A2, and the second outlet shut-off valve B2, respectively, to achieve interlocking. The central control computer 5 is provided with an interlocking start / release button. In the interlocking start state, the maximum pressure protection value is set according to the specific process. In the event of a malfunction or blockage at the outlet of the discharge pump 2, the first filter A, and the second filter B, or if the automatic switching fails, the discharge pump 2 can be interlocked and controlled to be stopped to prevent the discharge pump 2 from being damaged by pressure buildup. When the discharge pump 2 is started, stopped, or in operation, the sound and light alarm is controlled by the PLC programmable controller 4 to alarm, reminding the operator to check the discharge pump 2.

[0020] Taking the first filter A as an example, with the second filter B as a standby, the usage process is explained (the second filter B is in use, with the first filter A as a standby, the principle is the same).

[0021] Set the operating program on the central control computer 5, select first filter A for filtration, open the first inlet shut-off valve A1 and the first outlet shut-off valve A2, and close the second inlet shut-off valve B1 and the second outlet shut-off valve B2 of the second filter B. Open all valves on the discharge pipe of the polymerization reactor 1 and open the valve on the top pipe of the discharge chute 3.

[0022] When the first filter A is running, when the inlet and outlet pressure difference obtained by the first inlet pressure transmitter A3-the first outlet pressure transmitter A4 is ≥0.1Mpa, the second inlet shut-off valve B1 and the second outlet shut-off valve B2 of the standby second filter B are opened at the same time. After a delay of 5s, the first inlet shut-off valve A1 and the first outlet shut-off valve A2 of the first filter A are closed at the same time, and the cycle is repeated in sequence. The interlocking is set through the PLC programmable controller 4 to set the activation / release button on the central control computer 5. At the same time, the central control computer 5 can be set to select which filter to start running. Through the above design, the online switching of the first filter A and the second filter B can be realized.

[0023] At the same time, when the pressure difference of the first filter A or the second filter B during operation is ≥0.1Mpa, during the switching of the standby filter, the central control computer 5 controls the sound and light alarm through the PLC programmable controller 4 to issue a sound and light alarm reminder, promptly reminding on-site operators to check and clean the clogged filter.

Claims

1. A high-pressure filtration device for a polymerizer discharge pump, comprising a polymerizer (1), wherein the discharge port of the polymerizer (1) is connected to the inlet of a discharge pump (2), and is characterized in that: The high-pressure filtering device comprises two parallel-connected first filters (A) and second filters (B), the inlets of the first filters (A) and the second filters (B) being connected to the outlet of the discharge pump (2), and the outlets being connected to the inlet of the discharge trough (3); both the first filters (A) and the second filters (B) being provided with sound and light alarms, and the outlet pipe of the discharge pump (2) being provided with a pressure transmitter (6); The inlet pipe of the first filter (A) is provided with a first inlet shut-off valve (A1) and a first inlet pressure transmitter (A3), and the outlet pipe is provided with a first outlet pressure transmitter (A4) and a first outlet shut-off valve (A2); the inlet pipe of the second filter (B) is provided with a second inlet shut-off valve (B1) and a second inlet pressure transmitter (B3), and the outlet pipe is provided with a second outlet pressure transmitter (B4) and a second outlet shut-off valve (B2); The pressure transmitter (6), the first inlet pressure transmitter (A3), the second inlet pressure transmitter (B3), the first outlet pressure transmitter (A4) and the second outlet pressure transmitter (B4) are respectively electrically connected to the signal input end of the PLC programmable controller (4) of the central control computer (5), and the signal output end of the PLC programmable controller (4) is respectively electrically connected to the discharge pump (2), the sound and light alarm, the first inlet shut-off valve (A1), the second inlet shut-off valve (B1), the first outlet shut-off valve (A2) and the second outlet shut-off valve (B2).

2. The high-pressure filter device for a polymerizer discharge pump according to claim 1, wherein: The filter elements of the first filter (A) and the second filter (B) are made of stainless steel woven mesh or sintered mesh.

3. A high-pressure filter device for a polymerizer discharge pump according to claim 2, characterized in that: The mesh size of the filter in the filter element is 5-15 μm.

4. A high-pressure filter device for a polymerizer discharge pump according to claim 2, characterized in that: The first inlet shut-off valve (A1), the first outlet shut-off valve (A2), the second inlet shut-off valve (B1) and the second outlet shut-off valve (B2) are all high-pressure shut-off valves.

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