Filter suitable for concentrated formaldehyde entrained formic acid solution medium

Abstract

The utility model relates to the technical field of filter devices, in particular to a filter suitable for concentrated formaldehyde entrained formic acid solution media, which comprises a shell, an access hole is arranged at the top of the shell, a cover plate is arranged on the access hole, the cover plate is detachably connected onto the shell, a blow-down pipe is arranged on the cover plate, an end cover is arranged on the blow-down pipe, and the end cover is detachably connected onto the shell. A filter element is arranged in the shell, a feeding pipe is arranged on the side wall of the shell and located above the filter element, the bottom of the feeding pipe is flush with the top of the filter element, a discharging pipe is arranged at the bottom of the shell, a steam jacket is arranged on the outer wall of the shell, a steam inlet and a condensate water outlet are formed in the steam jacket, and a water outlet is formed in the condensate water outlet. And the steam inlet is positioned above the condensed water outlet. The problems that an existing filter has many dead corners and needs to be cleaned frequently, a filter element is prone to being damaged, and effective filtering cannot be achieved can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of filter devices, in particular to a filter suitable for a concentrated formaldehyde-entrained formic acid solution medium. Background Art

[0002] Polyformaldehyde devices usually use ceramic structured packing as distillation towers to increase the overall service life and reduce maintenance costs. However, since the ceramic structured packing itself is fragile, small pieces of packing fragments will inevitably be produced during use. In order to avoid affecting the subsequent process, it is necessary to install filters in each process section or under the tower to intercept packing fragments with a diameter greater than 3mm. Excessively concentrated formaldehyde systems often have a high content of formic acid, which requires the filter to have a certain anti-corrosion ability. There are built-in and external filtration forms. When the built-in filter is used in a concentrated formaldehyde system, it is easy to cause polyformaldehyde to be produced in the tower, which has a greater impact on production. Therefore, an external filter is usually used in a concentrated formaldehyde system. However, the existing external filters still have the following technical problems:

[0003] 1. The existing external filter has many dead corners. Polyformaldehyde will be quickly generated at the bottom of the filter where the flow is not smooth, which makes the filter need to be cleaned very frequently and difficult to clean.

[0004] 2. In order to prevent acid corrosion, the existing external filter usually uses PTFE material for the filter element. However, since the agglomerated polyformaldehyde is very dense, when polyformaldehyde accumulates, it is easy to damage the PTFE filter element by removing it, thus reducing the service life of the filter.

[0005] 3. During the filtration process, the filter element tends to float up and down, causing flow short circuit and unable to form effective filtration.

[0006] 4. The filter is easily clogged due to the deposition of polyformaldehyde, and needs to be cleaned frequently, which affects the stable operation of the device. In serious cases, it even causes the device to stop working, and increases the labor intensity of the operators and the cost of inspection and maintenance. At the same time, frequent cleaning of the filter will emit more volatile organic compounds to the outside, affecting the surrounding environment. Utility Model Content

[0007] The utility model provides a filter suitable for concentrated formaldehyde entrained formic acid solution medium, which can solve the problems that the existing filter has many dead angles, needs to be cleaned frequently, is easy to damage the filter element, and cannot effectively filter.

[0008] This application provides the following technical solutions:

[0009] A filter suitable for a medium of concentrated formaldehyde entrained formic acid solution, comprising a shell, a maintenance port is provided on the top of the shell, a cover plate is provided on the maintenance port, the cover plate is detachably connected to the shell, a vent pipe is provided on the cover plate, an end cap is provided on the vent pipe, a filter element is provided in the shell, a feed pipe is provided on the side wall of the shell, the feed pipe is located above the filter element, the bottom of the feed pipe is flush with the top of the filter element, a discharge pipe is provided at the bottom of the shell, a steam jacket is provided on the outer wall of the shell, a steam inlet and a condensate outlet are provided on the steam jacket, and the steam inlet is located above the condensate outlet.

[0010] Technical principles and beneficial effects: By making the bottom of the feed pipe flush with the top of the filter element and setting the discharge pipe at the bottom, the dead angle area on the filter structure is greatly reduced, effectively avoiding the formation of internal polymers caused by poor filter circulation. The use efficiency of the filter is improved and the frequency of filter element cleaning is reduced. The vent pipe set on the cover plate can be used to release the pressure in the shell, which is convenient for subsequent replacement of the filter element after pressure relief and cleaning of the filter element, thereby improving the safety of the operation. By setting a steam jacket on the outside of the shell, the temperature of the medium can be maintained, the formation of cold spots and crystallization can be avoided, and the filtration efficiency and filtration quality can be improved. The filter is suitable for the medium of concentrated formaldehyde entrained formic acid solution, with a simple structure, easy implementation, high maintenance efficiency and low maintenance cost.

[0011] Furthermore, an annular flange is provided on the inner wall of the shell, and an annular protrusion is provided on the top of the filter element. The annular protrusion of the filter element is fixedly connected to the annular flange of the shell, so that the filter element is fixed on the inner side of the shell.

[0012] Beneficial effect: The filter element is fixed inside the housing to avoid intermittent filtration failure caused by the filter element floating up and down.

[0013] Furthermore, a gasket is provided between the annular flange of the housing and the annular protrusion of the filter element.

[0014] Beneficial effect: The gasket can be a sealing gasket to improve the sealing performance between the housing and the filter element and improve the filtration quality.

[0015] Furthermore, a handle is provided on the annular protrusion of the filter element, and the gripping portion of the handle is located near the top of the shell.

[0016] Beneficial effect: The filter element can be easily replaced through the handle and grip, saving time and effort and improving maintenance efficiency.

[0017] Furthermore, a sealing gasket is provided between the shell and the cover plate, and a handle is provided on the cover plate.

[0018] Beneficial effects: The gasket ensures the sealing of the joint between the housing and the cover, preventing the leakage of liquid or gas media from the inspection port, ensuring the safety and efficiency of the filtration process. The handle makes it easier to remove and install the cover, and facilitates the replacement or maintenance of the filter element.

[0019] Furthermore, the bottom of the shell is conical.

[0020] Beneficial effects: The conical bottom reduces the dead corner area in the filter and facilitates the discharge of the filtered media, improving production efficiency.

[0021] Furthermore, the feed pipe of the shell extends in a horizontal direction, and the discharge pipe extends in a vertical direction.

[0022] Beneficial effects: The feed pipe is located in the horizontal direction, the discharge pipe is located in the vertical direction, and the feed pipe and the discharge pipe of the filter medium are at a 90° angle, which is convenient for installation at the 90-degree elbow of the pipeline and can effectively avoid the dead angle area inside the filter.

[0023] Furthermore, the filter element is provided with a plurality of filter holes arranged at intervals.

[0024] Beneficial effect: The filter holes arranged at intervals can effectively improve the quality of the filtered medium.

[0025] Furthermore, a steam jacket is provided on the cover plate.

[0026] Beneficial effect: The steam jacket is arranged on the cover plate, which helps to maintain the medium in the shell at a specific temperature, avoids the formation of cold spots and crystallization, and improves the filtration efficiency and filtration quality.

[0027] Furthermore, the shell and the cover plate are made of dual-phase steel material, and the filter element is made of titanium plate material.

[0028] Beneficial effects: Both duplex steel and titanium plate materials have excellent corrosion resistance and are suitable for handling corrosive media. Compared with the existing PTFE filter element, the filter element made of titanium plate material does not need to be replaced frequently, and is very suitable for filtering ceramic structured packing and other fragments and particles with a diameter greater than 3mm in the concentrated formaldehyde (or easy-to-crystallize medium) system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural cross-sectional view of a filter embodiment 1 of the utility model suitable for a medium of a concentrated formaldehyde-entrained formic acid solution;

[0030] Figure 2 The utility model is a filter element of the first embodiment of the filter suitable for the medium of concentrated formaldehyde entrained formic acid solution. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] The marks in the drawings of the specification include: shell 1, annular flange 101, cover plate 2, sealing gasket 3, handle 4, vent pipe 5, end cover 6, filter element 7, annular protrusion 701, gasket 8, handle 9, feed pipe 10, discharge pipe 11, steam jacket 12, steam inlet 13, condensate outlet 14, bracket 15.

[0033] Embodiment 1

[0034] like Figure 1 to Figure 2As shown, a filter suitable for a medium of a concentrated formaldehyde-entrained formic acid solution comprises a housing 1, a maintenance port is provided on the top of the housing 1, a cover plate 2 is provided on the maintenance port, the cover plate 2 is detachably connected to the flange at the maintenance port of the housing 1 by bolts, a sealing gasket 3 is provided between the housing 1 and the cover plate 2, a handle 4 is provided on the cover plate 2, a vent pipe 5 is provided on the cover plate 2, and an end cap 6 is provided on the vent pipe 5. Specifically, one end of the vent pipe 5 is communicated with the inner cavity of the housing 1, and the other end of the vent pipe 5 is provided with an end cap 6, and the end cap 6 is fixedly connected to the flange at the end of the vent pipe 5 by bolts. A filter element 7 is arranged in the housing 1, an annular flange 101 extending inward is arranged on the inner wall of the housing 1, an annular protrusion 701 extending outward is arranged on the top of the filter element 7, the annular flange 101 of the housing 1 is fixedly connected to the annular protrusion 701 of the filter element 7 by bolts, and the filter element 7 is fixed to the inner side of the housing 1, and the diameter of the annular protrusion 701 of the filter element 7 corresponds to the inner diameter of the housing 1, so as to prevent the annular protrusion 701 from forming a dead angle with the inner wall of the housing 1. A gasket 8 is arranged between the annular flange 101 of the housing 1 and the annular protrusion 701 of the filter element 7. A handle 9 is arranged on the annular protrusion 701 of the filter element 7, and the gripping part of the handle 9 is located near the top of the housing 1. The filter element 7 is provided with a plurality of filter holes evenly distributed and arranged at intervals. A feed pipe 10 is provided on the side wall of the housing 1. The feed pipe 10 is located obliquely above the filter element 7. The feed pipe 10 extends in the horizontal direction. The inner wall of the bottom of the feed pipe 10 is flush with the top of the filter element 7. A flange is provided at the end of the feed pipe 10 for connecting external equipment. The bottom of the housing 1 is conical. A discharge pipe 11 is provided at the bottom of the housing 1. The discharge pipe 11 extends in the vertical direction. A flange is provided at the end of the discharge pipe 11 for connecting external equipment. The discharge pipe 11 is opposite to the inspection port. The central axis of the discharge pipe 11 is on the same axis as the central axis of the inspection port. The central axis of the discharge pipe 11 forms a 90° angle with the central axis of the feed pipe 10. A steam jacket 12 is provided on the outer wall of the shell 1. The steam jacket 12 is located on the outer wall of the shell 1 opposite to the filter element 7 and is fixed to the shell 1 by welding or bolt sealing. A steam inlet 13 and a condensate outlet 14 are provided on the steam jacket 12. The steam inlet 13 is located above the condensate outlet 14. The steam inlet 13 is located at the upper end of the steam jacket 12, and the condensate outlet is located at the lower end of the steam jacket 12. A bracket 15 is provided on the outer side of the bottom of the shell 1. The shell 1 and the cover plate 2 are made of duplex steel material, and the filter element 7 is made of titanium plate material.

[0035] Here’s how to use it:

[0036] A filter suitable for the medium of concentrated formaldehyde entrained formic acid solution is installed on the high-concentration formaldehyde pipeline, so that the medium to be filtered enters the housing 1 from the feed pipe 10 of the filter, is filtered and separated by the filter element 7, and the filtered medium is discharged from the discharge pipe 11 at the bottom of the filter to enter the subsequent process section, and the filtered residue is retained on the filter element 7. During the filtering process, steam enters the steam jacket 12 from the steam inlet 13, passes through the steam jacket 12, and condensed water is discharged from the condensed water outlet 14 of the steam jacket 12. After a period of use, the filter residue deposited in the filter element 7 reaches a certain scale, and the filter element 7 needs to be cleaned to ensure the quality and filtering efficiency of the filter medium. When cleaning the filter element 7, open the end cover 6 on the vent pipe 5 to discharge the pressure accumulated in the housing 1, open the cover plate 2, remove the bolts on the annular protrusion 701 of the filter element 7 to release the fixing state between it and the housing 1, remove the filter element 7 from the inspection port on the top of the housing 1 through the handle 9 of the filter element 7, clean the filter element 7, and install the filter element 7 into the housing 1 in the reverse operation to complete the replacement and cleaning operation of the filter element 7.

[0037] Embodiment 2

[0038] The difference between this embodiment and the first embodiment is that the steam jacket 12 includes a first steam jacket and a second steam jacket, the first steam jacket surrounds the outside of the entire shell 1, and the second steam jacket is located on the outside of the cover plate 2 corresponding to the inner cavity of the shell 1. The first steam jacket and the second steam jacket can be connected through a connecting pipe, the steam inlet 13 is located at the upper end of the second steam jacket 12, and the condensate outlet 14 is located at the lower end of the first steam jacket. The first steam jacket and the second steam jacket can be set separately, and the first steam jacket and the second steam jacket are both provided with a steam inlet 13 and a condensate outlet 14, and the steam inlet 13 is located above the condensate outlet 14, and steam can be introduced separately when in use, thereby realizing flexible control to meet different filtering needs.

[0039] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium, characterized in that: It comprises a shell, the top of the shell is provided with an inspection port, the inspection port is provided with a cover plate, the cover plate is detachably connected to the shell, the cover plate is provided with a vent pipe, the vent pipe is provided with an end cover, a filter element is provided in the shell, a feed pipe is provided on the side wall of the shell, the feed pipe is located above the filter element, the bottom of the feed pipe is flush with the top of the filter element, a discharge pipe is provided at the bottom of the shell, a steam jacket is provided on the outer wall of the shell, a steam inlet and a condensate outlet are provided on the steam jacket, and the steam inlet is located above the condensate outlet.

2. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 1, characterized in that: An annular flange is arranged on the inner wall of the shell, an annular protrusion is arranged on the top of the filter element, and the annular protrusion of the filter element is fixedly connected to the annular flange of the shell, so that the filter element is fixed on the inner side of the shell.

3. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 2, characterized in that: A gasket is arranged between the annular flange of the housing and the annular protrusion of the filter element.

4. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 2, characterized in that: A handle is provided on the annular protrusion of the filter element, and a gripping portion of the handle is located near the top of the shell.

5. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 1, characterized in that: A sealing gasket is arranged between the shell and the cover plate, and a handle is arranged on the cover plate.

6. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 1, characterized in that: The bottom of the shell is conical.

7. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 1, characterized in that: The feed pipe of the shell extends in a horizontal direction, and the discharge pipe extends in a vertical direction.

8. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 1, characterized in that: The filter element is provided with a plurality of filter holes arranged at intervals.

9. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 1, characterized in that: A steam jacket is arranged on the cover plate.

10. A filter suitable for a concentrated formaldehyde-entrained formic acid solution medium according to claim 1, characterized in that: The housing and the cover plate are made of dual-phase steel material, and the filter element is made of titanium plate material.

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