CN202849287U

CN202849287U - Formaldehyde reaction system

Info

Publication number: CN202849287U
Application number: CN201220399970XU
Authority: CN
Inventors: 钱彤
Original assignee: 陈晋祥
Priority date: 2012-08-13
Filing date: 2012-08-13
Publication date: 2013-04-03
Anticipated expiration: 2022-08-13

Abstract

The utility model relates to the technical field of formaldehyde production devices, and in particular relates to a stable and energy-saving formaldehyde reaction system. The technical scheme of the utility model comprises that the provided formaldehyde reaction system comprises a ternary mixing filter, a reactor, a distillation absorption tower and a circulating pump which are sequentially connected, wherein the ternary mixing filter comprises an evaporator, a superheater and a fire retardance filter, the reactor is internally sequentially provided with a reaction chamber, a heat insulation filtering layer, a catalyst layer, a catalyst layer quenching heat exchanger and a heat recycling heat exchanger from top to bottom, and the distillation absorption tower comprises a tower bottom section, a distillation section used for methanol separation, a conversion section, an absorption section and a tower top section from top to bottom. The formaldehyde reaction system provided by the utility model has good filtering effect, system resistance is reduced by 0.02MPa, production capacity of formaldehyde is increased by 20% and is increased to 60000 tons from 50000 tons, unit consumption of formaldehyde production is reduced and is reduced to 440kg/ton from 451kg/ton, operation is safe, and stability is good.

Description

A kind of formaldehyde reaction system

Technical field

The utility model relates to the formaldehyde production device technical field, is specifically related to a kind of formaldehyde reaction system of stabilizing energy-saving.

Background technology

At present, the China silver method Formaldehyde Production was through more than 50 years courses of trials and hardship, all obtained in every respect great achievement, energy consumption changes outer air feed type into from consumption gas type, material consumption is from till now 445kg methyl alcohol of 500kg methyl alcohol/T37% formaldehyde/T37% formaldehyde, production capacity develops into more than 2,000 ten thousand tons of today from the hundreds of thousands of ton, and silver-colored method production production capacity and technology have been in rank first.Formaldehyde Production develops into the production that becomes more meticulous by extensive style, and to the road of career development, in technique and operation research is exactly to improve turnover ratio by simply.Present many factories manage in Formaldehyde Production, and formaldehyde process optimization, catalyst are selected and installed all and do well, but the material consumption level can only remain on about 445kg.

Domestic Formaldehyde Production mainly adopts two kinds of operational paths, traditional technology and circulation of tail gas method technique, traditional technology is to produce formaldehyde with the ternary gas oxidizing reaction, circulation of tail gas method technique is to adopt quaternary gas oxidizing reaction to produce formaldehyde, reactive absorption mechanism is basic identical, just the configuration of reaction member equipment configuration is different, circulation of tail gas method technique increases exhaust system, replace part ingredient water steam to remove reaction heat with tail gas, can accomplish 50% left and right sides concentration formaldehyde products, and two kinds of preparation method's pursuits all is to improve the transformation efficiency selectivity, all be as systems engineering Formaldehyde Production, make every effort to equipment, electric, instrument, starting material, operation and each unit of personnel, link is accomplished meticulous, reaches high conversion.

The power consumption of existing Formaldehyde Production system is high, and reaction process is restive, often is attended by the appearance of side reaction, and the concentration of the formaldehyde solution of producing is lower, the operating failure rate of equipment is also higher, therefore is necessary existing formaldehyde production equipment and production technique are improved.

The utility model content

The purpose of this utility model provides a kind of formaldehyde reaction system of stabilizing energy-saving, when improving transformation efficiency, does not reduce productivity.

The technical solution of the utility model is for providing a kind of formaldehyde reaction system, comprise the ternary mixer filter, reactor, distillation absorption tower and the recycle pump that connect successively, described ternary mixer filter comprises vaporizer, superheater, fire-retardant filter, be disposed with reaction chamber, heat insulation filtering layer, catalyst layer, catalyst layer rapid-cooling heat exchanger, heat recovering heat exchanger in the described reactor from top to bottom, described distillation absorption tower comprises section at the bottom of the tower from bottom to top, is used for distilling period, transformation segment, absorber portion and the tower top section of separating methanol.

As improvement of the present utility model, described heat insulation filtering layer is the heat insulation filtering layer that adopts lower metal oxide, pottery, carbon fiber, the aluminosilicate material of thermal conductivity to make.

As improvement of the present utility model, described heat insulation filtering layer adopts stupalith to make heat insulation filtering layer.

As improvement of the present utility model, described fire-retardant filter comprises heating component, spark arrester and combined strainer.

As improvement of the present utility model, described transformation segment is provided with sparger.

The beneficial effects of the utility model are: formaldehyde reaction of the present utility model system adopts the novel tertiary mixer filter, integrate and filter and back-fire relief, improve filter effect, systemic resistance reduces 0.02MPa, has improved Formaldehyde Production ability 20%, bring up to 60,000 tons by 50,000 tons, reduce the Formaldehyde Production unit consumption, be reduced to the 440kg/ ton by the 451kg/ ton, exhaust combustion is complete, efficient is high, and steam production increases.Operating safety, good stability is easy to clean.The utility model security of system is reliable, and long-time running is stable, lays a solid foundation for enterprise has created good economic benefit.

Description of drawings

Fig. 1 is the structural representation of formaldehyde reaction of the present utility model system;

1, ternary mixer filter; 11, vaporizer; 12, superheater; 13, fire-retardant filter;

2, reactor; 21, reaction chamber; 22, heat insulation filtering layer; 23, catalyst layer; 24, catalyst layer rapid-cooling heat exchanger; 25, heat recovering heat exchanger;

3, distillation absorption tower; 4, recycle pump.

Embodiment

By describing technology contents of the present utility model, structural attitude in detail, being realized purpose and effect, below in conjunction with embodiment and cooperate accompanying drawing to give in detail explanation.

See also Fig. 1, the formaldehyde reaction system of preferred forms as shown in Figure 1, have ternary mixer filter 1 and comprise vaporizer 11, superheater 12, fire-retardant filter 13, reactor 2, distillation absorption tower 3 and recycle pump 4, distillation absorption tower 3 comprises section at the bottom of the tower from bottom to top, the distilling period that is used for separating methanol, transformation segment, absorber portion and tower top section, section is load-bearing at the bottom of the tower, absorbing gas distributes again, product liquid level operation control, distilling period is separating methanol in the product, transformation segment is transfer column, the gas-liquid conversion, and liquid is distributing, liquid level control, absorber portion is the product absorption operation, and tower top section is gas-liquid separation, liquid distribution, by the successively effect of single unit system, output formaldehyde finished product.

Described reactor 2 comprises reaction chamber 21, heat insulation filtering layer 22, catalyst layer 23, rapid-cooling heat exchanger, heat recovering heat exchanger 25, set gradually heat insulation filtering layer 22, catalyst layer 23 in the reaction chamber 21 from top to bottom, the below of described catalyst layer is the catalyst layer support frame, catalyst layer support frame below is reaction gas catalyst layer rapid-cooling heat exchanger 24, and the below of catalyst layer rapid-cooling heat exchanger 24 is heat recovering heat exchanger 25.Heat insulation filtering layer is laid immediately on the upper surface of catalyst layer, and said heat insulation filtering layer is stupalith.Described heat recovering heat exchanger heat transferring medium is reaction gas, the step integrated structure of heat recovering heat exchanger employing unstripped gas, methyl alcohol, three kinds of media for heat exchanges of water enters the absorption tower below the reaction gas temperature is dropped to 80 degree again, increase substantially the heat recovery efficiency of reactor, reduce the thermal load on absorption tower.

The utility model utilizes the surface temperature of the heat-blocking action decrease high temperature catalyst layer of heat insulation filtering layer, and then reduces the generation that the methyl alcohol burning of catalyst layer surface generates the carbonic acid gas side reaction; Improve Reactor inlet unstripped gas temperature, and then improve the heat recovery efficiency of reactor, reduce the temperature of absorption tower import reaction gas, reduce alcohol consumption, the energy consumption of formaldehyde, reduce CO2 emissions; Realize purpose energy-conservation, that lower consumption, reduce discharging.

As further improvement of the utility model, described fire-retardant filter 13 comprises heating component, spark arrester and combined strainer, has prolonged the filter material life cycle, good filtration effect, so that easy for installation, transformation segment is provided with sparger, so that circulation is large, resistance is little, is evenly distributed.

Methyl alcohol of the present utility model enters the methanol evaporator bottom from the methyl alcohol scale tank by squeezing into, control flow by variable valve before entering methanol evaporator, enter a certain amount of air that is brought by gas blower from base of evaporator simultaneously, with the methyl alcohol in formaldehyde circulation fluid and the steam indirect heating vaporizer and the binary mixture of air, then binary mixture adds a certain amount of saturated vapor after scum dredger is removed droplet from the top, be made into the methyl alcohol with finite concentration proportioning, the three-element mixed gas body of air and water vapor, the three-element mixed gas body enters superheater, heat by steam, after filtering by fire-retardant filter, 110 degree enter in the reactor that is incorporated with catalyzer, under 610 degree high temperature, carry out methanol oxidation by catalyst layer from top to bottom and close deoxygenation, generation has the gas of formaldehyde, the gas that generates gathers cold by extremely cold section of reactor rapidly, then it being sent into the distillation absorption tower absorbs, the finished product that will contain formaldehyde enters the dealcoholysis device and carries out aldehyde, alcohol separates, alcohol is stayed and is entered after treatment the vaporizer use in the system, aldehyde is that finished product enters the formaldehyde test tank, remainder enters two-level absorption tower and absorbs, the rare aldehyde liquid that absorbs is got with pump, part self-circulation in tower absorbs, a part enters first stage tower and is used for replenishing absorption liquid, the unabsorbed tail gas in two-level absorption tower top is sent in the treater and is burnt, liberated heat produces steam indirectly, but the steam plenum system uses outward.

The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification sheets and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.

Claims

1. formaldehyde reaction system, it is characterized in that, comprise the ternary mixer filter, reactor, distillation absorption tower and the recycle pump that connect successively, described ternary mixer filter comprises vaporizer, superheater, fire-retardant filter, be disposed with reaction chamber, heat insulation filtering layer, catalyst layer, catalyst layer rapid-cooling heat exchanger, heat recovering heat exchanger in the described reactor from top to bottom, described distillation absorption tower comprises section at the bottom of the tower from bottom to top, is used for distilling period, transformation segment, absorber portion and the tower top section of separating methanol.

2. formaldehyde reaction according to claim 1 system is characterized in that, described heat insulation filtering layer is the heat insulation filtering layer that adopts lower metal oxide, pottery, carbon fiber or the aluminosilicate material of thermal conductivity to make.

3. formaldehyde reaction according to claim 1 system is characterized in that, described heat insulation filtering layer adopts stupalith to make heat insulation filtering layer.

4. formaldehyde reaction according to claim 1 system is characterized in that, described fire-retardant filter comprises heating component, spark arrester and combined strainer.