阅读说明：本技术 小型集块型甲醛装置 (Small-sized block type formaldehyde device ) 是由 周惠中 顾以洵 于 2021-09-09 设计创作，主要内容包括：本发明公开了一种小型集块型甲醛装置,甲醛装置本体包括依次连接的甲醇蒸发器模块、甲醇氧化模块、甲醛吸收模块和尾气处理器模块；所述甲醇蒸发器模块包括甲醇过滤器和复合型蒸发器,所述甲醇过滤器通过管道Ⅰ连接于复合型蒸发器,所述复合型蒸发器通过管道Ⅱ连接有空气过滤器,所述甲醇过滤器通过管道Ⅲ连接有甲醇泵；所述甲醇氧化模块包括氧化器,所述氧化器通过管道Ⅳ连接于复合型蒸发器；所述甲醛吸收模块包括依次连接的第一吸收塔、第二吸收塔、第三吸收塔和第四吸收塔,本发明不需要建厂房,安装方便快捷。设计合理,无环境污染问题,DCS控制,自动化操作,操作方简便。(The invention discloses a small-sized block-type formaldehyde device.A formaldehyde device body comprises a methanol evaporator module, a methanol oxidation module, a formaldehyde absorption module and a tail gas processor module which are sequentially connected; the methanol evaporator module comprises a methanol filter and a composite evaporator, the methanol filter is connected to the composite evaporator through a pipeline I, the composite evaporator is connected with an air filter through a pipeline II, and the methanol filter is connected with a methanol pump through a pipeline III; the methanol oxidation module comprises an oxidizer, and the oxidizer is connected to the composite evaporator through a pipeline IV; the formaldehyde absorption module comprises a first absorption tower, a second absorption tower, a third absorption tower and a fourth absorption tower which are connected in sequence. Reasonable in design, no environmental pollution problem, DCS control, automation mechanized operation, the operation is simple and convenient.)

1. The utility model provides a small-size glomeration type formaldehyde device, is including installing the formaldehyde device body in the frame of container, its characterized in that: the formaldehyde device body comprises a methanol evaporator module, a methanol oxidation module, a formaldehyde absorption module and a tail gas processor module (18) which are connected in sequence; the methanol evaporator module comprises a methanol filter (5) and a composite evaporator (3), the methanol filter (5) is connected to the composite evaporator (3) through a pipeline I, the composite evaporator (3) is connected with an air filter (1) through a pipeline II, and the methanol filter (5) is connected with a methanol pump (4) through a pipeline III; the methanol oxidation module comprises an oxidizer (7), and the oxidizer (7) is connected to the composite evaporator (3) through a pipeline IV; the formaldehyde absorption module comprises a first absorption tower (8), a second absorption tower (9), a third absorption tower (10) and a fourth absorption tower (11) which are sequentially connected, the oxidizer (7) is connected to the first absorption tower (8) through a pipeline V, and the fourth absorption tower (11) is connected to the composite type evaporator (3) through a tail gas processor module (18).

2. A compact cluster block formaldehyde unit as in claim 1, wherein: the pipeline I is provided with an adjusting valve (6), and the pipeline II is provided with a Roots blower (2).

3. A compact cluster block formaldehyde unit as in claim 1, wherein: the plate heat exchanger comprises a first heat exchanger (13), a second heat exchanger (15) and a third heat exchanger (17), wherein the first heat exchanger (13) is connected to a second absorption tower (9) through a pipeline VI, the second heat exchanger (15) is connected to a third absorption tower (10) through a pipeline VII, and the third heat exchanger (17) is connected to a fourth absorption tower (11) through a pipeline VIII.

4. A compact cluster block formaldehyde unit as in claim 3, wherein: and a first circulating pump (12), a second circulating pump (14) and a third circulating pump (16) are respectively arranged on the pipeline VI, the pipeline VII and the pipeline VIII, and the third heat exchanger (17) is connected to the second absorption tower (9) through a pipeline IX.

Technical Field

The invention relates to the technical field of formaldehyde preparation equipment, in particular to a small-sized block-type formaldehyde device.

Background

The formaldehyde plant is developing to large scale in China, and the formaldehyde plant must experience: designing, manufacturing single non-standard equipment, purchasing standard equipment, configuring electric instruments, civil engineering, transporting the equipment, installing single equipment in place, connecting pipelines, installing the electric instruments, linking the equipment with water, debugging devices and driving, wherein the period is generally over 9 months (no expert reviews such as project approval, safety assessment, environmental assessment, ability assessment, occupational health assessment and the like are included). The simple formaldehyde device does not adopt the arrangement mode of modules, a factory building is needed, and the single equipment is installed one by one;

in foreign markets, many customers are small users who use formaldehyde by themselves, and the characteristics of the formaldehyde devices required by the customers are as follows:

1. the yield required is relatively small, and the daily yield is generally: 20TPD (0.6 ten thousand tons/year), 30TPD (0.9 ten thousand tons/year), 40TPD (1.2 ten thousand tons/year), mainly used by oneself;

2. the total investment is required to be relatively less, the construction period is required to be relatively short, and preferably once a contract is signed, a complete set of pre-assembled formaldehyde device can be provided within 3 months and transported to the site, and products can be discharged within one month in a building block type mode;

3. a production workshop is not built, and only a plurality of equipment module foundations are needed;

4. the device is designed according to the production of 37 percent formaldehyde water solution.

Since the capacity of the formaldehyde devices ordered by some small countries abroad is too small, and the implementation period is basically the same as that of a large formaldehyde device, some small users propose to develop small-sized lump-type formaldehyde devices.

Disclosure of Invention

The invention aims to provide a small-sized lump type formaldehyde device to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a small-sized block-type formaldehyde device comprises a formaldehyde device body arranged in a frame of a container, wherein the formaldehyde device body comprises a methanol evaporator module, a methanol oxidation module, a formaldehyde absorption module and a tail gas processor module which are sequentially connected;

the methanol evaporator module comprises a methanol filter and a composite evaporator, the methanol filter is connected to the composite evaporator through a pipeline I, the composite evaporator is connected with an air filter through a pipeline II, and the methanol filter is connected with a methanol pump through a pipeline III;

the methanol oxidation module comprises an oxidizer, and the oxidizer is connected to the composite evaporator through a pipeline IV;

the formaldehyde absorption module comprises a first absorption tower, a second absorption tower, a third absorption tower and a fourth absorption tower which are sequentially connected, the oxidizer is connected to the first absorption tower through a pipeline V, and the fourth absorption tower is connected to the composite evaporator through a tail gas processor module.

As a further optimization of the technical scheme, the pipeline I is provided with an adjusting valve, and the pipeline II is provided with a Roots blower.

As further optimization of the technical scheme, the system further comprises a plate heat exchanger module, wherein the plate heat exchanger module comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, the first heat exchanger is connected to the second absorption tower through a pipeline VI, the second heat exchanger is connected to the third absorption tower through a pipeline VII, and the third heat exchanger is connected to the fourth absorption tower through a pipeline VIII.

As a further optimization of the technical scheme, a first circulating pump, a second circulating pump and a third circulating pump are respectively arranged on the pipeline VI, the pipeline VII and the pipeline VIII, and the third heat exchanger is connected to the second absorption tower through a pipeline IX.

Compared with the prior art, the invention has the beneficial effects that: the invention does not need to build a factory building, only one empty space is needed, the module is put according to the drawing, and the method comprises the following steps: water, electricity, gas and steam are connected with few pipelines and electrical instruments, so that the device is convenient and quick. Reasonable in design, no environmental pollution problem, DCS control, automation mechanized operation, the operation is simple and convenient.

Drawings

FIG. 1 is a schematic diagram of the connection of the present invention.

In the figure: the system comprises an air filter 1, a Roots blower 2, a composite evaporator 3, a methanol pump 4, a methanol filter 5, a regulating valve 6, an oxidizer 7, a first absorption tower 8, a second absorption tower 9, a third absorption tower 10, a fourth absorption tower 11, a first circulating pump 12, a first heat exchanger 13, a second circulating pump 14, a second heat exchanger 15, a third circulating pump 16, a third heat exchanger 17 and a tail gas processor module 18.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a small-sized block-type formaldehyde device comprises a formaldehyde device body arranged in a frame of a container, wherein the formaldehyde device body comprises a methanol evaporator module, a methanol oxidation module, a formaldehyde absorption module and a tail gas processor module 18 which are sequentially connected;

the methanol evaporator module comprises a methanol filter 5 and a composite evaporator 3, the methanol filter 5 is connected to the composite evaporator 3 through a pipeline I, the composite evaporator 3 is connected with an air filter 1 through a pipeline II, and the methanol filter 5 is connected with a methanol pump 4 through a pipeline III;

the methanol oxidation module comprises an oxidizer 7, and the oxidizer 7 is connected to the composite evaporator 3 through a pipeline IV;

the formaldehyde absorption module comprises a first absorption tower 8, a second absorption tower 9, a third absorption tower 10 and a fourth absorption tower 11 which are sequentially connected, the oxidizer 7 is connected to the first absorption tower 8 through a pipeline V, and the fourth absorption tower 11 is connected to the composite evaporator 3 through a tail gas processor module 18.

Specifically, the pipeline I is provided with a regulating valve 6, and the pipeline II is provided with a Roots blower 2.

The device comprises a plate heat exchanger module, wherein the plate heat exchanger module comprises a first heat exchanger 13, a second heat exchanger 15 and a third heat exchanger 17, the first heat exchanger 13 is connected to a second absorption tower 9 through a pipeline VI, the second heat exchanger 15 is connected to a third absorption tower 10 through a pipeline VII, and the third heat exchanger 17 is connected to a fourth absorption tower 11 through a pipeline VIII.

Specifically, a first circulating pump 12, a second circulating pump 14 and a third circulating pump 16 are respectively arranged on the pipeline vi, the pipeline vii and the pipeline viii, and the third heat exchanger 17 is connected to the second absorption tower 9 through a pipeline ix.

Specifically, when in use, air is filtered by the air filter 1, pumped out by the Roots blower 2, metered and sent to the composite evaporator 3 of the methanol evaporator module;

a methanol evaporator module: methanol is sent into a methanol filter 5 of a methanol evaporation module by a methanol pump 4 of the tank area, the flow is controlled by a regulating valve 6 and then enters a composite evaporator 3, and the methanol is heated by formaldehyde at the bottom of a first absorption tower 8 of a formaldehyde absorption module and is bubbled to evaporate the methanol;

in order to reduce the explosion limit, ingredient steam, air, methanol gas and the ingredient steam are required to be added into the composite evaporator 3, mixed in the composite evaporator 3, superheated to about 100 ℃, filtered by a high-efficiency filter body and sent into an oxidizer 7 of a methanol oxidation module through a flame arrester;

a methanol oxidation module: the mixed gas from the methanol evaporation module enters an oxidizer 7 of the methanol evaporation module, and is subjected to a violent oxidation exothermic reaction under the catalysis of a silver catalyst to generate formaldehyde gas, and the formaldehyde gas is discharged to a formaldehyde absorption module after passing through a quenching section;

in order to avoid the decomposition of formaldehyde gas and the continuous oxidation reaction to generate formic acid, the oxidizer 7 is provided with a quenching section which is cooled by water, and the cooling water is heated and gasified to generate steam which enters an oxidizer steam pocket and is used for proportioning the steam and the overheating part of the composite evaporator 3;

the methanol oxidation module is provided with a multi-stage pump and can supplement water to the steam drum of the oxidizer and the steam drum of the tail gas processor;

a formaldehyde absorption module: 4 absorption towers, namely a first absorption tower 8, a second absorption tower 9, a third absorption tower 10 and a fourth absorption tower 11 are assembled and installed for absorbing formaldehyde;

first-stage absorption-rectification absorption of a tower bottom packing section of a first absorption tower 8: and (3) feeding the formaldehyde mixed gas from the oxidizer (7) into a tower bottom filling section of a first absorption tower (8) to perform a complex rectification absorption process with the sprayed formaldehyde liquid, so as to obtain high-concentration formaldehyde (37-48%). The heat is sent to the overheating section of the composite evaporator 3;

second-stage absorption-absorption by the second absorption tower 9: the formaldehyde gas which is not absorbed by the first absorption tower 8 enters the second absorption tower 9, and absorption liquid of the second absorption tower 9 is extracted by a first circulating pump 12, passes through a first heat exchanger 13 and then enters the top of the second absorption tower 9 for secondary spray absorption;

third stage absorption-absorption by the third absorption tower 10: the formaldehyde gas which is not absorbed by the second absorption tower 9 enters a third absorption tower 10, and absorption liquid of the third absorption tower 10 is extracted by a second circulating pump 14, passes through a second heat exchanger 15 and then enters the top of the third absorption tower 10 for secondary spray absorption;

fourth stage absorption-absorption by the fourth absorption tower 11: the formaldehyde gas which is not absorbed by the third absorption tower 10 enters a fourth absorption tower 11, and the absorption liquid of the fourth absorption tower 11 is extracted by a third circulating pump 16, passes through a third heat exchanger 17 and then enters the top of the second absorption tower 9 for secondary spray absorption.

The tail gas from the fourth absorption tower 11 is discharged into a tail gas treatment module 18;

the exhaust gas processor module 18: the tail gas liquid seal tank, the tail gas processor steam drum and the tail gas processor blower are arranged in the tail gas liquid seal tank, are mainly used for burning waste gas containing hydrogen (containing 16% -18%), and are used for outputting byproduct steam outwards.

Technical parameters, 40TPD small-sized cluster type formaldehyde device:

electricity: 28Kwh/t, and a distribution transformer of 120 KVA. (cable line to plant);

water: supplementing soft water for 4 t/h;

steam: 0.5t/h (0.4MPa) is used for driving each time;

yield: 40 tons/day (TPD);

unit consumption: a guaranteed value of 0.442 tonnes methanol/tonne formaldehyde; the expected value is 0.440 ton methanol/ton formaldehyde;

the product quality meets the national standard superior product, namely formaldehyde (37-45 +/-0.5%); methanol is less than or equal to 1 percent; the acidity is less than or equal to 0.01 percent.

Compared with the prior device and process, the invention has the following advantages:

1. small-size glomeration type formaldehyde device is applicable to the small-size formaldehyde device of foreign country, like: 20TPD, 30TPD, 40TPD need not build the factory building, as long as there is an empty space, puts the module according to the drawing, leads to: water, electricity, gas and steam are connected with few pipelines and electrical instruments, so that the device is convenient and quick.

2. The process flow of the small-sized block type formaldehyde device is completely the same as that of the bulk formaldehyde device.

3. The invention has reasonable design and no environmental pollution.

4. The whole small-sized block-type formaldehyde device system is the same as a bulk formaldehyde device, is controlled by a DCS (distributed control system), is automatically operated, and is simple and convenient to operate.

In 2019, no-tin market, huihao plastic machinery Limited company exports a set of 40TPD small formaldehyde devices from Pakistan, and 1 set of devices is implemented according to the set; it is simple and quick, and its effect is identical to that described above.

The invention mainly solves the following problems:

1. the problem of the transportation of container frame of solution of small-size collection piece type formaldehyde device:

in the formaldehyde production section, a formaldehyde device is generally divided into 4 parts: methanol evaporation, methanol oxidation, formaldehyde absorption, tail gas combustion byproduct steam,

we designed a "lumped" formaldehyde plant: the equipment of each workshop section is assembled in a frame which accords with the size of a container, after the container is transported to the site, the container is put on the basis of the pre-made equipment or is erected, after the container is fixed, corresponding public engineering (water, electricity, gas, steam, methanol and formaldehyde) pipelines are connected according to the requirements of the company, and then the 37 percent formaldehyde aqueous solution required by customers can be produced at the highest speed.

For the convenience of installation, the release "album piece type" formaldehyde device of being convenient for designs into:

1-1, composite evaporator type + oxidizer is equipped with steam drum type + tower liquid heating methanol type;

1-2, a 37% formaldehyde aqueous solution formaldehyde device producing 40TPD in daily life;

1-3, the size of the container, our formaldehyde device is placed in the frame of the container:

container, especially container for transporting goods	Length, m	Width, m	Height, m	Remarks for note
					20”	5.899	2.352	2.386	Frame thickness of 0.15 m
35”	10.54	2.34	2.39	Frame thickness of 0.15 m
					40”	12.02	2.35	2.38	Frame thickness of 0.15 m

The maximum 40TPD of the "compact mass Formaldehyde unit" was used as the design basis (this approach is followed for 20 and 30 designs);

the main chemical reaction equation for formaldehyde generation:

and (3) oxidation reaction:

CH₃OH+1/2O₂ → CH₂O+H₂O （1）

dehydrogenation reaction:

CH₃OH → CH₂O+ H₂ （2）

chemical equation of side reaction in the reaction process:

CH₃OH+3/2O₂ → CO₂+2H₂O （3）

CH₃OH → CO + 2H₂O ……… （4）

CH₃OH + H₂ → CH₄ + H₂O ……… （5）

CH₃OH + O₂ → HCOO H + H₂ O（6）。

although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.