Filtering device of maleic anhydride production vacuum system

Abstract

The utility model relates to the technical field of maleic anhydride production, in particular to a filter device of a vacuum system for maleic anhydride production. Comprising an analysis gas pipe which is connected with an inlet of a steam ejector through a filtering mechanism, and differential pressure gauges are arranged at the inlet end and the outlet end of the filtering mechanism through pipelines; the filtering mechanism comprises a filter, the filter comprises a shell, a filter screen, a cleaning brush and a slag scraping rake are arranged in an inner cavity of the shell, the inner cavity of the shell is divided into a feeding cavity and a discharging cavity by the filter screen, the cleaning brush is movably arranged in the feeding cavity and comprises a long-strip-shaped brush head, bristles are arranged on the brush head, the ends of the bristles abut against the filter screen, and a cleaning rod perpendicular to the brush head is arranged on the brush head. The cleaning rod is parallel to the filter screen and penetrates through the shell to be fixedly connected with a piston rod of the first air cylinder. The device effectively filters and intercepts colloidal impurities in gas, prevents the colloidal impurities from entering the steam ejector, ensures stable operation of a system, can clean the filter screen in time, prevents the filter screen from being blocked, and reduces the labor intensity of manual cleaning.

Description

TECHNICAL FIELD

[0001] The utility model relates to maleic anhydride production technical field, specifically to maleic anhydride production vacuum system filter device. BACKGROUND

[0002] Maleic anhydride is a commonly used basic important organic chemical raw material, is the second largest acid anhydride raw material in the world only next to phthalic anhydride, and its downstream product has quite extensive development and application prospect. Maleic anhydride is widely used in synthetic resin, paint, pesticide, lubricating oil additive, medicine, paper treating agent, food additive, stabilizer etc. With maleic anhydride as raw material can produce 1,4-butanediol (BDO), gamma-butyrolactone (GLB), tetrahydrofuran (THF). In recent years, China maleic anhydride industry continues high-speed development, fixed bed n-butane process uses dibutyl phthalate (DBP) as solvent absorption process, and the process technology is advanced, can form upstream and downstream in refining enterprise, promotes the extension of refining industry chain to a certain extent. At the same time, it reduces environmental pollution, creates good conditions for realizing environment-friendly enterprise. At the same time, the project construction cycle is shorter, and the investment is fast, and it has strong market competitiveness.

[0003] Maleic anhydride production is divided into oxidation, absorption and analysis, refining, solvent post-treatment, solid packaging etc. process, and the absorption and analysis is to enter the absorption and analysis system from the reaction gas of maleic anhydride oxidation process. First, dibutyl phthalate (DBP) is used to absorb maleic anhydride, and then maleic anhydride is resolved from dibutyl phthalate (DBP), and the waste gas of absorption section is sent to the tail gas treatment system. The crude maleic anhydride produced by the absorption and analysis system enters the maleic anhydride refining system for further refining to meet the specification requirements of the finished product. The dibutyl phthalate (DBP) solvent resolved enters the solvent treatment system, and needs to be washed continuously to remove impurities, and the treated solvent returns to the absorption system.

[0004] The resolving tower must be maintained at 3KPa vacuum state, and the liquid maleic anhydride is resolved, and the light reaction by-products such as acetic acid and acrylic acid are removed by the vacuum system with gas phase. A small amount of maleic anhydride, acetic acid, acrylic acid and other by-products in light component gas and a small amount of water carried in the system further occur complex reactions such as polymerization in the pipeline before entering the steam ejector, and new polymers are generated. These polymers are insoluble in water, enter the steam ejector pump, and accumulate in the steam ejector nozzle and the condenser, and block the steam ejector pump and the condenser tube bundle, and further affect the normal operation of the ejector, damage the system vacuum, and eventually lead to the shutdown of the device. UTILITY MODEL CONTENTS

[0005] The utility model wants to solve the technical problem, propose a malonic anhydride production vacuum system filter device, effective filter intercepts the gelatinous impurity in gas, avoids its into steam ejector, guarantees the system smooth operation, and can clean filter screen in time, avoids filter screen blockage, reduces the labor intensity of manual cleaning.

[0006] The malonic anhydride production vacuum system filter device, including the analytic gas pipe, the analytic gas pipe is connected steam ejector entrance through filter mechanism, and the import end and export end of filter mechanism are equipped with pressure difference table through pipeline;Filter mechanism includes filter, and the filter includes shell, and the inner chamber of shell is equipped with filter screen, cleaning brush and slag rake, and the inner chamber of shell is divided into feed chamber and discharge chamber by filter screen, and cleaning brush is movably arranged in feed chamber, and cleaning brush includes strip-shaped brush head, and is equipped with bristle on brush head, and bristle end is abutted with filter screen, and cleaning rod is vertically arranged on brush head, and cleaning rod is fixedly connected with the piston rod of cylinder no.

[0007] Preferably, the filter mechanism includes two parallelly connected filters. The two filters are used alternatively, and when manual cleaning is needed, the two filters can be switched to work alternately without affecting production, thus greatly prolonging the operation cycle of the vacuum system and ensuring the safe and long-term stable operation of the device.

[0008] Preferably, the slag collecting cavity is a horse stall-shaped cavity.

[0009] Preferably, the slag collecting cavity is provided with a slag discharge port at the bottom.

[0010] Preferably, the lower bottom surface of the slag removing cavity is parallel to the push-pull rod and abuts against the bottom of the slag rake, and the lower bottom surface of the slag removing cavity is provided with a slag feeding port communicating with the slag collecting cavity.

[0011] Preferably, the top of the tine is provided with a protrusion, which is more convenient for scraping off the attachments on the bristles.

[0012] Valves can be arranged on the pipelines according to the control needs, and the valves are opened and closed to conveniently control the on-off of the materials in the corresponding pipelines and adjust the flow of the materials.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1. The filter mechanism is added in the front section of the steam ejector, which can effectively filter and block the gelatinous substances formed by by-products acetic acid, propylene acid and their polymers, effectively prevent the polymerized organic matters from entering the nozzle and condenser of the steam ejector to cause blockage, and ensure the stable operation of the device.

[0015] 2. When the gelatinous impurities are intercepted by the filter screen and attached to the filter screen, the air cylinder one pushes the cleaning rod to make the cleaning brush clean the surface of the filter screen, then pushes the cleaning brush to the slag removal cavity and contacts the slag removal rake, the tines of the slag removal rake are inserted between the bristles of the cleaning brush, the air cylinder two is started to push the slag removal rake to the discharge cavity direction through the push-pull rod, the tines scrape off the impurities attached to the bristles and fall into the slag collection cavity, then the cleaning rod is lifted, the cleaning brush is reset, the push-pull rod is retracted, and the slag removal rake is reset, so that the next filter screen cleaning can be carried out; thus, the filter screen blockage is avoided, and the labor intensity of manual cleaning is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the utility model;

[0017] Figure 2 is a schematic view of the internal structure of the filter;

[0018] Figure 3 is another angle structural schematic view of the internal structure of the filter;

[0019] Figure 4 is a structural schematic view of the slag removal rake;

[0020] In the drawing: 1, analysis gas pipe; 2, steam ejector; 3, differential pressure gauge; 4, filter; 5, shell; 6, filter screen; 7, cleaning brush; 8, slag removal rake; 9, feeding cavity; 10, discharging cavity; 11, brush head; 12, bristle; 13, cleaning rod; 14, slag removal cavity; 15, slag removal port; 16, tine; 17, push-pull rod; 18, slag collection cavity; 19, slag discharge port; 20, slag feeding port; 21, protruding block. DETAILED DESCRIPTION

[0021] The utility model will be described clearly and completely in combination with the drawings.

[0022] As Figure 1 , Figure 2 , Figure 3As shown, the maleic anhydride production vacuum system filter device, including the analysis gas pipe 1, the analysis gas pipe 1 is connected through the filter mechanism steam ejector 2 inlet, the filter mechanism import end and export end are provided with differential pressure table 3 through pipeline;The filter mechanism includes filter 4, filter 4 includes shell 5, the inner cavity of shell 5 is provided with filter screen 6, cleaning brush 7 and slag rake 8, filter screen 6 divides the inner cavity of shell 5 into feed cavity 9 and discharge cavity 10, cleaning brush 7 is movably arranged in feed cavity 9, cleaning brush 7 includes long strip brush head 11, brush head 11 is provided with bristle 12, the end of bristle 12 is in abutment with filter screen 6, cleaning rod 13 is vertically arranged on brush head 11, cleaning rod 13 is parallelly arranged with filter screen 6 and is fixedly connected with the piston rod of cylinder one by penetrating through shell 5;The lower part of filter screen 6 is provided with slag removal cavity 14, the front and rear sidewalls of slag removal cavity 14 are respectively arranged on the two sides of filter screen 6 and are respectively connected with the lower bottom surface of feed cavity 9 and discharge cavity 10, the top of slag removal cavity 14 is provided with slag removal port 15 for cleaning brush 7 to pass through, slag removal port 15 is communicated with feed cavity 9, slag removal cavity 14 is provided with slag rake 8, the rake tooth 16 is arranged on the slag rake 8, the rake tooth 16 is arranged towards the bristle 12, the push-pull rod 17 is arranged on the side of the slag rake 8 close to the feed cavity 9, the push-pull rod 17 is vertically arranged with filter screen 6 and is fixedly connected with the piston rod of cylinder two by penetrating through the sidewall of slag removal cavity 14;The bottom of slag removal cavity 14 is communicated with slag collection cavity 18.

[0023] The filter mechanism includes two parallelly connected filter 4.

[0024] The slag collection cavity 18 is a horse stall-shaped groove.

[0025] The bottom of slag collection cavity 18 is provided with slag discharge port 19.

[0026] The lower bottom surface of slag removal cavity 14 is parallelly arranged with push-pull rod 17 and is in sliding abutment with the bottom of slag rake 8, the lower bottom surface of slag removal cavity 14 is provided with slag delivery port 20, and the slag delivery port 20 is communicated with slag collection cavity 18.

[0027] As shown in the figure, Figure 4 The top of rake tooth 16 is provided with protruding block 21.

[0028] The working process is as follows: gas from the analysis gas pipe 1 through the filter 4 of the filter mechanism into the feeding chamber 9, discharged from the discharge chamber 10 and then into the steam ejector 2, through the filter to intercept and adhere to the filter screen 6 the gelatinous impurities formed by by-products acetic acid, acrylic acid and its polymer, etc., the gas cylinder pushes the cleaning rod 13 to make the cleaning brush 7 clean the surface of the filter screen 6, then pushes the cleaning brush 7 into the slag removal chamber 14 and contacts with the slag rake 8, the tines 16 of the slag rake 8 are inserted between the bristles 12 of the cleaning brush 7, the gas cylinder 2 is started to push the slag rake 8 to the discharge chamber 10 direction through the push-pull rod 17, the tines 16 scrape off the impurities adhered to the bristles 12 and fall into the slag collection chamber 18, then the cleaning rod 13 is lifted, the cleaning brush 7 is reset, the push-pull rod 17 is retracted, and the slag rake 8 is reset, the next cleaning of the filter screen 6 can be carried out, so that the filter screen 6 is cleaned in time, reducing the frequency of manual cleaning.

[0029] When the differential pressure table 3 shows that the filter screen 6 is blocked and needs manual cleaning, the gas can be filtered through another parallel filter 4, which does not affect the production.

Claims

1. A filtering device for a vacuum system for the production of maleic anhydride, characterized in that, The utility model relates to a steam jet filter mechanism, which comprises a resolving air pipe (1) connected with the inlet of a steam jet (2) through a filtering mechanism, and a differential pressure gauge (3) arranged at the inlet and outlet of the filtering mechanism through pipelines; the filtering mechanism comprises a filter (4) including a shell (5) with a filter screen (6), a cleaning brush (7) and a slag scraping rake (8) arranged in the inner cavity of the shell (5); the filter screen (6) divides the inner cavity of the shell (5) into a feeding cavity (9) and a discharging cavity (10); the cleaning brush (7) is movably arranged in the feeding cavity (9) and comprises an elongated brush head (11) with bristles (12) arranged thereon, the end of the bristles (12) abutting against the filter screen (6), and a cleaning rod (13) arranged perpendicularly to the brush head (11) and fixedly connected with the piston rod of a cylinder one and passing through the shell (5); the lower part of the filter screen (6) is provided with a slag removing cavity (14) with two side walls arranged on both sides of the filter screen (6) and connected with the lower bottom surface of the feeding cavity (9) and the discharging cavity (10) respectively; the top of the slag removing cavity (14) is provided with a slag removing opening (15) through which the cleaning brush (7) passes, and the slag removing opening (15) is connected with the feeding cavity (9); the slag removing cavity (14) is provided with the slag scraping rake (8) with rake teeth (16) arranged towards the bristles (12); the side of the slag scraping rake (8) close to the feeding cavity (9) is provided with a push-pull rod (17) arranged perpendicularly to the filter screen (6) and fixedly connected with the piston rod of a cylinder two and passing through the side wall of the slag removing cavity (14); and the bottom of the slag removing cavity (14) is connected with a slag collecting cavity (18).

2. The succinic anhydride production vacuum system filter apparatus according to claim 1, wherein, The filtering mechanism comprises two filters (4) connected in parallel.

3. The succinic anhydride production vacuum system filter apparatus according to claim 1, wherein, The slag collecting cavity (18) is a horse stall-shaped groove.

4. The succinic anhydride production vacuum system filter apparatus according to claim 1, wherein, The bottom of the slag collecting cavity (18) is provided with a slag discharging opening (19).

5. The succinic anhydride production vacuum system filter apparatus according to claim 1, wherein, The lower bottom surface of the slag removing cavity (14) is arranged perpendicularly to the push-pull rod (17) and abuts against the bottom of the slag scraping rake (8) in sliding mode; the lower bottom surface of the slag removing cavity (14) is provided with a slag feeding opening (20) connected with the slag collecting cavity (18).

6. The succinic anhydride production vacuum system filtration apparatus of claim 1, wherein, The top of the rake teeth (16) is provided with a protruding block (21).

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