CN213314211U

CN213314211U - A formaldehyde replacement device for formaldehyde production facility

Info

Publication number: CN213314211U
Application number: CN202021450470.5U
Authority: CN
Inventors: 吴秀艳; 胡波; 李长胜
Original assignee: Zhangjiagang Huachang New Material Technology Co ltd
Current assignee: Zhangjiagang Huachang New Material Technology Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-06-01
Anticipated expiration: 2030-07-22

Abstract

The application discloses a formaldehyde replacement device for formaldehyde production equipment, which relates to the field of formaldehyde production and preparation and comprises the following steps of; the fan is used for extracting formaldehyde in the formaldehyde production equipment, and a fourth pipeline is arranged on the fan; the tail gas liquid seal groove is connected with the third pipeline and is used for containing tail gas discharged by formaldehyde production equipment, and a fifth pipeline is arranged on the tail gas liquid seal groove; the tail gas processor is connected with the fifth pipeline; and the tail gas absorption tower is connected with the sixth pipeline. This application is through setting up one set of formaldehyde replacement system between formaldehyde production facility and tail gas treater, after formaldehyde production facility parks, replaces out through remaining formaldehyde in the fan with formaldehyde production facility to send into the tail gas absorption tower with the replacement gas and absorb the back and discharge, reduce the influence of inorganization emission formaldehyde to environment, human body.

Description

A formaldehyde replacement device for formaldehyde production facility

Technical Field

The application relates to the field of formaldehyde production and preparation, in particular to a formaldehyde replacement device for formaldehyde production equipment.

Background

Methanol is adopted as a raw material for producing formaldehyde, and two main methods are adopted: the equipment structure of the iron-molybdenum method catalytic oxidation method and the silver catalytic oxidation method is shown in Chinese patent with the publication number of CN 102320942A. With the continuous development of social economy, the whole formaldehyde industry has great progress in the aspects of equipment design, catalyst improvement, waste heat utilization, production process control and the like. However, formaldehyde is a highly hazardous substance, and besides safety measures such as leakage prevention in daily production, the harm of formaldehyde volatilization to operators during equipment inspection and maintenance is also considered. Specifically, when the formaldehyde production equipment is overhauled, due to the fact that formaldehyde gas exists in the system, the formaldehyde production equipment can affect the environment, cause health hazards to operating personnel and cause dangerous factors to fire operation, and therefore replacement is needed, and air purging is generally used. However, after the equipment is stopped, the fan in the main flow is stopped, and the blowing and replacement cannot be carried out.

In the prior art, a technical scheme of replacing by taking a measure of temporarily taking over power air or low-pressure nitrogen exists, but for devices with large volumes and large residual quantities, such as an oxidizer and an absorption tower, the problems of overlong replacement time, urgent overhaul time and the influence of restriction of a workshop section before a factory on the use of an external air source exist. And the silver catalysis method basically needs to be stopped for one time to replace the silver catalyst after 3 months, when equipment is opened or a pipeline is disconnected, residual formaldehyde can enter the operation environment in an unorganized mode, the environment is influenced, health hazards are produced to operating personnel, and even the fire operation is dangerous. Therefore, the replacement mode of the temporary connecting pipe is very unfavorable for the operation health and safety of maintenance personnel, and is not suitable for large-scale popularization and use.

Disclosure of Invention

The utility model provides a formaldehyde replacement device for formaldehyde production facility solves the formaldehyde in the formaldehyde production facility parking back system and can't sweep the problem of replacement, prevents that formaldehyde gas from leaking and producing the influence, produce healthy harm, produce danger to the operation personnel to the environment.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions: a formaldehyde displacement device for a formaldehyde production facility, comprising: the first pipeline is connected with formaldehyde production equipment, and a second pipeline and a third pipeline are arranged on the first pipeline; the fan is used for extracting formaldehyde in the formaldehyde production equipment, and a fourth pipeline is arranged on the fan; the tail gas liquid seal groove is connected with the third pipeline and is used for containing tail gas discharged by formaldehyde production equipment, and a fifth pipeline is arranged on the tail gas liquid seal groove; the tail gas processor is connected with the fifth pipeline; a sixth conduit in communication with the fourth conduit and the fifth conduit; and the tail gas absorption tower is connected with the sixth pipeline.

In above-mentioned technical scheme, this application embodiment is through setting up one set of formaldehyde replacement system between formaldehyde production facility and tail gas treater, after formaldehyde production facility parks, replaces out through remaining formaldehyde in the fan with formaldehyde production facility to send the replacement gas into the tail gas absorption tower and absorb the back and discharge, reduce the influence of inorganization emission formaldehyde to environment, human body. The fan can be started at any time without being influenced by maintenance frequency, construction period and previous working section, and the large replacement air quantity can shorten replacement, inspection and maintenance time and make a contribution to recovery of production as soon as possible.

Further, according to this application embodiment, wherein, the fourth pipeline sets up on the air outlet of fan.

Further, according to the embodiment of the application, wherein a valve is arranged on the fifth pipeline.

Further, according to the embodiment of the application, a valve is arranged between the sixth pipeline and the fifth pipeline.

Further, according to the embodiment of the application, wherein the fifth pipeline is connected with the bottom of the tail gas processor.

Further, according to the embodiment of the application, an eighth pipeline is arranged on the other side of the bottom of the tail gas processor, and the eighth pipeline is used for introducing air to the bottom of the tail gas processor.

Further, according to the embodiment of the application, a seventh pipeline is arranged in the middle of the tail gas processor, and the seventh pipeline is used for introducing desalted water into the tail gas processor.

Further, according to the embodiment of the application, the sixth pipeline is connected with the bottom of the tail gas absorption tower.

Further, according to the embodiment of the application, wherein the tail gas absorption tower is internally provided with a filler.

Further, according to the embodiment of the application, a ninth pipeline is arranged at the upper part of the tail gas absorption tower, and the ninth pipeline is used for spraying desalted water into the tail gas absorption tower; a tenth pipeline is arranged at the bottom end of the tail gas absorption tower and used for discharging wastewater in the tail gas absorption tower; the tenth pipeline is communicated with the middle part of the ninth pipeline.

Compared with the prior art, the method has the following beneficial effects: this application is through setting up one set of formaldehyde replacement system between formaldehyde production facility and tail gas treater, after formaldehyde production facility parks, replaces out through remaining formaldehyde in the fan with formaldehyde production facility to send into the tail gas absorption tower with the replacement gas and absorb the back and discharge, reduce the influence of inorganization emission formaldehyde to environment, human body. The fan can be started at any time without being influenced by maintenance frequency, construction period and previous working section, and the large replacement air quantity can shorten replacement, inspection and maintenance time and make a contribution to recovery of production as soon as possible.

Drawings

The present application is further described below with reference to the drawings and examples.

FIG. 1 is a formaldehyde displacement device for a formaldehyde production facility according to the present application.

In the drawings: 1. a first conduit; 2. a second conduit; 3. a fan; 4. a third pipeline; 5. a fourth conduit; 6. tail gas liquid seal tank; 7. a fifth pipeline; 8. a sixth pipeline; 9. a tail gas processor; 10. a seventh pipe; 11. an eighth conduit; 12. a tail gas absorption tower; 13. a ninth conduit; 14. a tenth conduit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.

This application discloses a formaldehyde replacement device for formaldehyde production facility through fig. 1, known current formaldehyde production facility will be for it to concentrate to carry to burn the back and discharge in the tail gas treater, this application sets up shown formaldehyde replacement device between formaldehyde production facility and tail gas treater on prior art's basis, the problem of the replacement can't be swept to the formaldehyde in the formaldehyde production facility system after parking has been solved, prevent that formaldehyde gas from leaking and producing the influence to the environment, produce healthy harm to the operating personnel, produce danger to the operation of moving a fire.

Specifically, as shown in fig. 1, the formaldehyde replacement device described in the present application includes a first pipeline 1, where the first pipeline 1 is used to communicate with a formaldehyde production device, collect tail gas generated by the formaldehyde production device, and temporarily replace gas (i.e., formaldehyde) during parking inspection of the formaldehyde production device. Be provided with second pipeline 2 and third pipeline 4 on the first pipeline 1, fan 3 is connected to second pipeline 2, and tail gas liquid seal groove 6 is connected to third pipeline 4.

If formaldehyde production facility normal operating, then tail gas lets in tail gas liquid seal groove 6 through first pipeline 1, third pipeline 4, is provided with fifth pipeline 7 on the gas vent of tail gas liquid seal groove 6, and tail gas treater 10 is connected to fifth pipeline 7, and the tail gas in the tail gas liquid seal groove 6 lets in tail gas treater 10 and burns the back emission.

If the formaldehyde production equipment is stopped and checked, the fan 3 is started, and the formaldehyde (namely the displacement gas) in the formaldehyde production equipment is pumped out through the first pipeline 1 and the second pipeline 2. The air outlet of the fan 3 is provided with a fourth pipeline 5 for discharging the pumped replacement gas. The fourth pipeline 5 is connected with a sixth pipeline 8, the sixth pipeline 8 is connected with a tail gas absorption tower 12, and the replacement gas is sent to the tail gas absorption tower 12 to be absorbed and then discharged. Meanwhile, at the start-up and shutdown stage of the formaldehyde production equipment, the formaldehyde production equipment can also produce a small amount of tail gas, and the application makes the tail gas produced at the moment enter the tail gas liquid seal tank 6 through the fifth pipeline 7 and the sixth pipeline 8, and then enters the sixth pipeline 8 through the fifth pipeline 7, and is sent into the tail gas absorption tower 12 together with the displacement gas to be absorbed and then discharged.

In above-mentioned technical scheme, this application is through setting up one set of formaldehyde replacement system between formaldehyde production facility and tail gas treater, after formaldehyde production facility parks, replaces out through remaining formaldehyde in the fan 2 with formaldehyde production facility to send into tail gas absorption tower 12 with the replacement gas and absorb the back and discharge, reduce the influence of inorganization emission formaldehyde to environment, human body. The fan 2 can be started at any time without being influenced by maintenance frequency, construction period and previous working section, and the large replacement air quantity can shorten replacement and maintenance time and make a contribution to recovery of production as soon as possible.

In addition, valves are respectively arranged on the fifth pipeline 7 and between the fifth pipeline 7 and the sixth pipeline 8, and are used for controlling the flow direction of the tail gas in the tail gas liquid seal tank. Specifically, when the formaldehyde production equipment normally operates, the valve on the fifth pipeline 7 is opened, the valve between the sixth pipeline 8 and the fifth pipeline 7 is closed, and the tail gas flows to the tail gas processor 9 through the fifth pipeline 7; when the formaldehyde production equipment is started and stopped, the valve on the fifth pipeline 7 is closed, the valve on the sixth pipeline 8 is opened, and the tail gas flows to the tail gas absorption tower 12 through the sixth pipeline.

On the tail gas treater 9, tail gas is let in from the bottom of tail gas treater 9, is provided with eighth pipeline 11 at the opposite side of tail gas treater 9 bottom, and eighth pipeline 11 is used for letting in air to tail gas treatment 9 bottom, and the air is used for burning tail gas. The middle part of the tail gas processor 9 is provided with a seventh pipeline 10 for introducing desalted water into the tail gas processor 9. The medium pressure steam generated by burning the tail gas is discharged from the upper part of the tail gas treater 9, and the burned gas is discharged from the top end of the tail gas treater 9.

On the off-gas absorption tower 12, a displacement gas and a small amount of off-gas are introduced from the bottom of the off-gas absorption tower 12. The tail gas absorption tower 12 is internally provided with a filler. The upper part of the tail gas absorption tower 12 is provided with a ninth pipeline 13, and the ninth pipeline 13 is used for spraying desalted water into the tail gas absorption tower 12 and absorbing the replacement gas. At the bottom end of the tail gas absorption tower 12, a tenth pipe 14 is provided for discharging the waste water absorbing the displacement gas out of the tail gas absorption tower. The middle part of the tenth pipeline 14 is communicated with the middle part of the ninth pipeline 13, and is used for returning part of desalted water to the tail gas absorption tower 12 for recycling.

Although the illustrative embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the embodiments, and various modifications within the spirit and scope of the present application defined and determined by the appended claims will be apparent to those skilled in the art from this disclosure.

Claims

1. A formaldehyde replacement device for formaldehyde production equipment, comprising:

the first pipeline is connected with the formaldehyde production equipment, and a second pipeline and a third pipeline are arranged on the first pipeline;

the fan is used for extracting formaldehyde in the formaldehyde production equipment, and a fourth pipeline is arranged on the fan;

the tail gas liquid seal groove is connected with the third pipeline and is used for containing tail gas discharged by the formaldehyde production equipment, and a fifth pipeline is arranged on the tail gas liquid seal groove;

a tail gas processor connected with the fifth pipeline;

a sixth conduit in communication with the fourth conduit and the fifth conduit;

and the tail gas absorption tower is connected with the sixth pipeline.

2. The formaldehyde displacing device for a formaldehyde producing apparatus as recited in claim 1, wherein the fourth duct is provided on an air outlet of the blower.

3. The formaldehyde displacing device for a formaldehyde producing apparatus as recited in claim 1, wherein a valve is provided on the fifth pipe.

4. The formaldehyde displacing device for a formaldehyde producing apparatus of claim 1, wherein a valve is disposed between the sixth pipe and the fifth pipe.

5. The formaldehyde displacing device for a formaldehyde producing apparatus of claim 1, wherein the fifth pipeline is connected to a bottom of the off-gas treater.

6. The formaldehyde displacing device for the formaldehyde producing apparatus as recited in claim 5, wherein an eighth pipeline is disposed on the other side of the bottom of the off-gas processor, and the eighth pipeline is used for introducing air into the bottom of the off-gas processor.

7. The formaldehyde displacing device for the formaldehyde producing apparatus as recited in claim 1, wherein a seventh pipeline is disposed in the middle of the tail gas processor, and the seventh pipeline is used for introducing desalted water into the tail gas processor.

8. The formaldehyde displacing device for a formaldehyde producing apparatus of claim 1, wherein the sixth pipeline is connected to a bottom of the off-gas absorbing tower.

9. The formaldehyde displacing device for a formaldehyde producing apparatus of claim 1, wherein a packing is disposed in the off-gas absorbing tower.

10. The formaldehyde replacing device for the formaldehyde production equipment as claimed in claim 1, wherein a ninth pipeline is arranged at the upper part of the tail gas absorption tower, and the ninth pipeline is used for spraying desalted water into the tail gas absorption tower; a tenth pipeline is arranged at the bottom end of the tail gas absorption tower and used for discharging wastewater in the tail gas absorption tower; the tenth pipe is communicated with the middle of the ninth pipe.