CN217041966U - Device for recycling formaldehyde-containing wastewater in polyformaldehyde device - Google Patents
Device for recycling formaldehyde-containing wastewater in polyformaldehyde device Download PDFInfo
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- CN217041966U CN217041966U CN202122880157.6U CN202122880157U CN217041966U CN 217041966 U CN217041966 U CN 217041966U CN 202122880157 U CN202122880157 U CN 202122880157U CN 217041966 U CN217041966 U CN 217041966U
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Abstract
The utility model discloses a device for recycling formaldehyde-containing wastewater in a polyformaldehyde device, which comprises a formaldehyde absorption system and a waste gas washing system, wherein the formaldehyde absorption system comprises a formaldehyde absorption tower A and a formaldehyde absorption tower B, the spraying feeding pipelines of the formaldehyde absorption tower A and the formaldehyde absorption tower B are both connected with a desalted water main pipeline, and the desalted water main pipeline and the two spraying feeding pipelines are both provided with an isolation valve; the waste gas washing system comprises a waste gas washing tower, and a discharge regulating valve is arranged on a production pipeline of the waste gas washing tower; a second isolation valve, a third isolation valve and a pilot valve are arranged on the recovery pipeline; the spraying and feeding pipelines of the formaldehyde absorption tower A and the formaldehyde absorption tower B are respectively provided with a first flow regulating valve and a second flow regulating valve. The utility model discloses can collect formaldehyde waste water back rectification according to former process route and retrieve formaldehyde, also can continue to absorb formaldehyde gas as the absorbent with formaldehyde waste water.
Description
Technical Field
The utility model belongs to the technical field of energy saving and consumption reduction, more specifically say, relate to a recycle contains device of formaldehyde waste water in polyformaldehyde device.
Background
At present, in the production process of polyformaldehyde, a rectification process is used for recovering formaldehyde, a large amount of steam is consumed in the rectification process, wastewater is generated, and the wastewater can be discharged after being treated by a wastewater treatment plant. The formaldehyde absorption tower is a bubble-cap tower, a bubble-cap tower plate is arranged at the top of the tower, desalted water is used as an absorbent to absorb the formaldehyde gas produced by the formaldehyde reactor, and the formaldehyde gas is extracted after the concentration of the formaldehyde in the tower bottom reaches 40% -45% after the formaldehyde gas is subjected to lower circulation absorption, middle circulation absorption and bubble-cap absorption.
The existing formaldehyde recovery and formaldehyde absorption processes need to consume steam and demineralized water respectively, the consumption of the steam and the demineralized water is large, so that the production cost of an enterprise in the production process is increased, and the wastewater amount is also large.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough among the prior art, provide a recycle contains the device of formaldehyde waste water among the polyformaldehyde device, can collect back rectification recovery formaldehyde with formaldehyde waste water according to former process route, also can continue to absorb formaldehyde gas as the absorbent with formaldehyde waste water.
The purpose of the utility model is realized through following technical scheme.
The utility model discloses recycle device that contains formaldehyde waste water among polyformaldehyde device, formaldehyde absorption system and exhaust gas scrubbing system in including polyformaldehyde device, formaldehyde absorption system includes formaldehyde absorption tower A and formaldehyde absorption tower B, the spraying feeding pipeline at formaldehyde absorption tower A and formaldehyde absorption tower B top all is connected with the total pipeline of demineralized water through the tee bend, and all be provided with the isolation valve No. one on total pipeline of demineralized water and two spraying feeding pipelines; the waste gas washing system comprises a waste gas washing tower, and a discharge regulating valve is arranged on a production pipeline of the waste gas washing tower; a recovery pipeline is connected between the downstream of the first isolation valve of the desalted water main pipeline and the upstream of the discharge regulating valve of the extraction pipeline, and a second isolation valve, a third isolation valve and a pilot valve are arranged on the recovery pipeline; a first flow regulating valve and a second flow regulating valve are respectively arranged on the spraying and feeding pipelines at the tops of the formaldehyde absorption tower A and the formaldehyde absorption tower B.
No. two isolation valves and No. three isolation valves set up respectively in recovery pipeline both ends.
And the second isolation valve and the third isolation valve are both manual valves, and are preferably stop valves.
The first flow control valve and the second flow control valve are controlled by remote transmission and are connected with a DCS control system.
Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
the utility model discloses recycle contains device of formaldehyde waste water, with the formaldehyde-containing waste water pipeline and the two sets of formaldehyde absorption tower tops of former exhaust gas washing tower spray pan feeding main pipe connection, will contain formaldehyde waste water and send to two sets of formaldehyde absorption towers respectively through the pipeline, replace demineralized water to absorb formaldehyde as the absorbent. The flow of formaldehyde waste water entering the formaldehyde absorption tower is adjusted through the flow control valve, and the load of the formaldehyde absorption tower is adjusted, the device does not influence the normal operation of the formaldehyde absorption tower and the normal operation of the original formaldehyde recovery system. On the premise of not adding new equipment, the device only adds partial pipelines and valves, has small investment, can reduce the dosage of desalted water of the formaldehyde absorption tower, the load of the formaldehyde recovery tower and the dosage of steam, and meets the aims of energy conservation, consumption reduction and emission reduction of enterprises.
Drawings
FIG. 1 is a schematic view of a formaldehyde absorption system in a polyoxymethylene device.
FIG. 2 is a schematic diagram of an off-gas scrubbing system in a polyoxymethylene device.
FIG. 3 is a schematic view of the device for recycling formaldehyde-containing wastewater of the present invention.
Reference numerals: 1-second isolation valve; 2-a third isolation valve; 3-a flow regulating valve; 4-second flow control valve; 5-a pilot shower valve; 6-a recovery pipeline; 7-isolation valve number one; 8-formaldehyde absorption tower A; 9-formaldehyde absorption tower B; 10-a spray feeding pipeline; 11-a main pipeline for demineralized water; 12-a generated gas input pipeline; 13-a crude aldehyde recycle line; 14-crude aldehyde circulating pump; 15-crude aldehyde cooler; 16-crude aldehyde storage tank; 17-a mid-aldehyde recycle line; 18-mid-aldehyde recycle pump; 19-a mid-aldehyde cooler; 20-a waste gas washing tower; 21-a demineralized water input pipeline; 22-a formaldehyde-containing waste gas pipeline; 23-a circulation conduit; 24-a gas scrubbing pump; 25-upper cooler; 26-a production pipe; 27-discharge regulating valve; 28-a production pump; 29-lower stage cooler.
Detailed Description
The technical solutions of the present invention are further described in detail by the following specific embodiments, but it should be pointed out that the following embodiments are only used for describing the contents of the present invention, and do not limit the scope of the present invention.
Referring to fig. 1 and 2, there are schematic diagrams of a formaldehyde absorption system and an exhaust gas scrubbing system in a conventional polyoxymethylene device, in which the formaldehyde absorption system and the exhaust gas scrubbing system are independent systems, and each absorbs formaldehyde through demineralized water.
As shown in fig. 1, the formaldehyde absorption system comprises a formaldehyde absorption tower A8 and a formaldehyde absorption tower B9, the spraying feeding pipelines 10 at the tops of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9 are both connected with a demineralized water main pipeline 11 through a tee joint, and the demineralized water main pipeline 11 and the two spraying feeding pipelines 10 are both provided with a first isolation valve 7. The side walls of the lower parts of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9 are both connected with a generated gas input pipeline 12. The bottom of formaldehyde absorption tower A8 and formaldehyde absorption tower B9 all is connected with thick aldehyde circulating line 13, all be provided with thick aldehyde circulating pump 14 and thick aldehyde cooler 15 on the thick aldehyde circulating line 13, thick aldehyde cooler 15 low reaches still is connected to thick aldehyde storage tank 16 through the pipeline. The middle parts of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9 are both connected with a medium aldehyde circulating pipeline 17, and the medium aldehyde circulating pipeline 17 is provided with a medium aldehyde circulating pump 18 and a medium aldehyde cooler 19. The generated gas prepared by the formaldehyde reactor respectively enters the bottoms of a formaldehyde absorption tower A8 and a formaldehyde absorption tower B9, desalted water serving as an absorbent enters from the tops of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9, and formaldehyde solution with the concentration of 40-45% is extracted after lower circulation, middle circulation and bubble cap absorption.
As shown in fig. 2, the exhaust gas washing system includes exhaust gas washing tower 20, exhaust gas washing tower 20 upper portion and lower part are connected with demineralized water input pipeline 21, contain formaldehyde exhaust gas pipeline 22 respectively, exhaust gas washing tower 20 middle part is connected with circulating line 23, is provided with gas washing pump 24, upper segment cooler 25 on the circulating line 23, exhaust gas washing tower 20 bottom is connected to formaldehyde recovery system through producing pipeline 26, produce and have set gradually along liquid flow direction on the pipeline 26 and produce pump 28, lower section cooler 29, ejection of compact governing valve 27, and the export of lower section cooler 29 still is connected to exhaust gas washing tower 20 through pipe-line circulation. The waste gas washing tower 20 uses desalted water to wash formaldehyde waste gas, formaldehyde waste water with the concentration of 0.42% is extracted, the formaldehyde waste water is conveyed to a formaldehyde recovery system through an extraction pump 28, and is mixed with formaldehyde-containing waste water in other procedures and then enters a formaldehyde recovery tower for rectification after being preheated, so that crude formaldehyde with the concentration of 45% is obtained.
The formaldehyde wastewater extracted by the waste gas washing system is analyzed, and the formaldehyde wastewater comprises the following components: 99.58 percent of water and 0.42 percent of formaldehyde. Since the exhaust gas washing tower 20 also uses demineralized water for exhaust gas washing, no other impurities are present. If the formaldehyde wastewater replaces demineralized water to be used as the absorbents of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9 for recycling, the consumption of the demineralized water can be reduced, the steam consumption and the wastewater quantity of a formaldehyde recovery system can be reduced, and the purposes of energy conservation and consumption reduction are achieved.
As shown in fig. 3, the device for recycling formaldehyde-containing wastewater in the polyformaldehyde device of the present invention comprises a formaldehyde absorption system and a waste gas washing system in the polyformaldehyde device, wherein a recycling pipeline 6 is connected between the downstream of a first isolation valve 7 of a desalted water main pipeline 11 in the formaldehyde absorption system and the upstream of a discharge regulating valve 27 of a discharge pipeline 26 in the waste gas washing system, and the recycling pipeline 6 is provided with a second isolation valve 1, a third isolation valve 2 and a pilot shower valve 5; no. two isolation valves 1 and No. three isolation valve 2 set up respectively in 6 both ends of recovery pipeline, No. two isolation valves 1 and No. three isolation valve 2 all adopt manual valve, preferred stop valve. A first flow regulating valve 3 and a second flow regulating valve 4 with valve position regulating functions are respectively arranged on the spraying and feeding pipelines 10 at the tops of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9. The first flow control valve 3 and the second flow control valve 4 are controlled by remote transmission and are connected with a DCS control system.
Under normal working conditions, the flow of the formaldehyde-containing wastewater entering the tops of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9 is respectively controlled by the first flow control valve 3 and the second flow control valve 4. According to the working conditions of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9, all or part of formaldehyde wastewater can be used as an absorbent and is sent into the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9. Not only saves the consumption of desalted water, but also reduces the steam consumption and the wastewater generation of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9.
Under abnormal conditions, for example, when the formaldehyde absorption tower A8 (or the formaldehyde absorption tower B9) is stopped, the formaldehyde-containing wastewater cannot be sent to the formaldehyde absorption tower, at this time, the corresponding first flow control valve 3 (or the second flow control valve 4) and the corresponding first isolation valve 7 can be closed, so that the formaldehyde-containing wastewater enters the formaldehyde absorption tower B9 (or the formaldehyde absorption tower A8) independently, and the discharge control valve 27 on the extraction pipeline 26 originally going to the formaldehyde recovery system is adjusted, thereby increasing the flow of the formaldehyde-containing wastewater and maintaining the liquid level of the waste gas washing tower 20. And for example, the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9 are completely stopped, at the moment, the first flow regulating valve 3, the second flow regulating valve 4 and the second isolating valve 1 can be closed, the discharge regulating valve 27 on the extraction pipeline 26 which originally goes to the formaldehyde recovery system is regulated, and the formaldehyde wastewater is completely conveyed to the formaldehyde recovery system and is mixed with the formaldehyde-containing wastewater of other units for formaldehyde recovery.
Adopt the utility model discloses recycle contains device of formaldehyde waste water in the polyformaldehyde device, its operation process as follows: opening the second isolating valve 1 and the third isolating valve 2, setting the first flow regulating valve 3 and the second flow regulating valve 4, gradually opening the large waste gas washing tower 20 to extract the flow of the waste water formaldehyde-removing absorption tower A8 and the flow of the formaldehyde absorption tower B9, and correspondingly closing or closing the discharge regulating valve 27 on the original extraction pipeline 26 going to the formaldehyde recovery system. According to the feed amount of the generated gas of the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9 and the concentration of the extracted crude formaldehyde, the feed amount of the formaldehyde-containing wastewater is correspondingly adjusted.
After the formaldehyde absorption system breaks down, the formaldehyde-containing wastewater can not be sent to the formaldehyde absorption tower A8 and the formaldehyde absorption tower B9, the first flow control valve 3, the second flow control valve 4 and the second isolation valve 1 are closed at the moment, the formaldehyde-containing wastewater is continuously sent to the formaldehyde recovery system, and the original discharge control valve 27 on the extraction pipeline 26 going to the formaldehyde recovery system is adjusted, so that the waste gas washing system can normally run.
When the utility model discloses the device need be overhauld, closes No. two isolation valves 1 and No. three 2 at 6 both ends of recovery pipeline, newly increase the 6 disconnection of recovery pipeline in the device, exhaust gas scrubbing system is kept apart with formaldehyde absorption system, opens and leads drenching valve 5, and material unloading in the pipeline is overhauld. After the overhaul is finished, the device is put into use again according to the process described above
The utility model discloses with the extraction pipeline of the waste gas washing system in the former polyformaldehyde device and formaldehyde absorption tower top portion spray pan feeding pipe connection of formaldehyde absorption system, utilize original device to realize the recycle that contains formaldehyde waste water. The utility model discloses the formaldehyde can be retrieved with formaldehyde waste water collection back rectification to the device according to former process route, also can continue to absorb formaldehyde gas with formaldehyde waste water as the absorbent. On the premise of not adding new equipment, only part of pipelines and valves are added, so that the investment is low, the desalted water consumption of the formaldehyde absorption tower, the steam consumption of the formaldehyde absorption tower in a formaldehyde recovery system and the wastewater output can be reduced, and the aims of energy conservation and consumption reduction of enterprises are fulfilled.
Although the functions and operations of the present invention have been described with reference to the drawings, the present invention is not limited to the specific functions and operations, and the above embodiments are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention.
Claims (4)
1. A device for recycling formaldehyde-containing wastewater in a polyformaldehyde device comprises a formaldehyde absorption system and a waste gas washing system in the polyformaldehyde device, wherein the formaldehyde absorption system comprises a formaldehyde absorption tower A (8) and a formaldehyde absorption tower B (9), spray feeding pipelines (10) at the tops of the formaldehyde absorption tower A (8) and the formaldehyde absorption tower B (9) are connected with a desalted water main pipeline (11) through a tee joint, and isolation valves (7) are arranged on the desalted water main pipeline (11) and the two spray feeding pipelines (10); the waste gas washing system comprises a waste gas washing tower (20), and a discharge regulating valve (27) is arranged on a production pipeline (26) of the waste gas washing tower (20); the system is characterized in that a recovery pipeline (6) is connected between the downstream of a first isolation valve (7) of the desalted water main pipeline (11) and the upstream of a discharge regulating valve (27) of a production pipeline (26), and a second isolation valve (1), a third isolation valve (2) and a pilot shower valve (5) are arranged on the recovery pipeline (6); a first flow regulating valve (3) and a second flow regulating valve (4) are respectively arranged on the spraying and feeding pipelines (10) at the tops of the formaldehyde absorption tower A (8) and the formaldehyde absorption tower B (9).
2. The device for recycling the wastewater containing formaldehyde in the polyoxymethylene device according to claim 1, wherein the second isolation valve (1) and the third isolation valve (2) are respectively disposed at two ends of the recycling pipe (6).
3. The device for recycling the formaldehyde-containing wastewater in the polyoxymethylene device according to claim 1, wherein the second isolation valve (1) and the third isolation valve (2) are manual valves.
4. The device for recycling the wastewater containing formaldehyde in the polyformaldehyde device according to claim 1, wherein the first flow control valve (3) and the second flow control valve (4) are controlled by remote transmission and are connected to a DCS control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122880157.6U CN217041966U (en) | 2021-11-23 | 2021-11-23 | Device for recycling formaldehyde-containing wastewater in polyformaldehyde device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122880157.6U CN217041966U (en) | 2021-11-23 | 2021-11-23 | Device for recycling formaldehyde-containing wastewater in polyformaldehyde device |
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| Publication Number | Publication Date |
|---|---|
| CN217041966U true CN217041966U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122880157.6U Active CN217041966U (en) | 2021-11-23 | 2021-11-23 | Device for recycling formaldehyde-containing wastewater in polyformaldehyde device |
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| Country | Link |
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| CN (1) | CN217041966U (en) |
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2021
- 2021-11-23 CN CN202122880157.6U patent/CN217041966U/en active Active
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