CN2105992U - Gas absorption installation with static mixed element - Google Patents

Abstract

The utility model belongs to an absorbing apparatus which is composed of a plurality of static mixing absorbers and a corresponding gas-liquid separation chamber connected with the static mixing absorbers in sequence. A guide shell, a gas-liquid baffle or a sieve plate, etc. can be arranged in the gas-liquid separation chamber. A liquid guiding pipe is arranged between the gas-liquid separation chamber and a static mixer in the next stage. The static mixing absorber can also work as a heat exchanger. The gas-liquid baffle can also work as a gas distributor. The flow direction of gas and liquid in a tower is in a single-stage parallel current mode, and the flow direction of the entire tower is in an adverse current mode. The static mixing element not only improves the mass transfer, but also improves the heat transfer. Thus, the utility model has the advantages of small volume, low manufacturing cost, little accessory equipment, low operating cost, energy saving and water saving. In addition, a plurality of towers can be converted to a single tower, so the occupation area is reduced.

Description

Gas absorption installation with static mixed element

The utility model belongs to absorption equipment.

Absorption is one of unit operations the most general in the Chemical Manufacture.As CO in the ammonia synthesizing industry ₂Processing; H in the oil field gas ₂S, CO ₂Remove; CO in the basic industry ₂Processing; SO in the mist ₂Removal etc. all need in absorption equipment, carry out.In these absorption processes or with the generation of chemical reaction, or the process of a Physical Absorption.But they all exist the problem of quality, momentum, heat transmission.No matter present employed absorption equipment is bubble tower, packed tower or plate column, and it is huge that ubiquity equipment, and cost height, mass transfer, heat transfer coefficient are low, operating maintenance expense height, cooling water consumption are big, defectives such as energy consumption height.Therefore technical progress is all being sought in countries in the world, tries hard to develop the equipment and the operating procedure thereof of energy-conservation, water saving, efficient, easily manufactured, stable operation, maintenance easily.In recent years, abroad the someone has developed multistage disc type absorber, also the someone has developed the absorber of fierce two-way injection collision streaming ... it is little that but the said equipment ubiquity and made difficulty, operating cost reduces amplitude, responding is difficult for carrying out defectives such as heat exchange when hot, so it is applied and is restricted.For the someone of exchangeing problem also who solves absorption process reaction heat has developed additional heat exchanger outside bubble tower or packed tower, force gas-liquid between tower and heat exchanger, to circulate with pump, thereby realize temperature controlling in the tower.Though this method has changed the cooling situation in the tower, the reduction of its investment and operating cost is less, still fails to tackle the problem at its root.

Since late nineteen seventies, some external companies, R﹠D institution are devoted to the research that static mixing element is strengthened GAS ABSORPTION always.Developed the internal circulation gas-lift type absorption equipment that has static mixing element in succession; Strengthen gas-liquid mixed with static mixer, in bubble tower, carry out GAS ABSORPTION thereafter, the static mixing formula absorption equipment that the while sprays with lean solution on the top of tower etc.But because the said equipment gas-liquid is overall and stream, the inherent law of many compositions balance between gas-liquid two-phase, limited the minimizing that is absorbed composition content in the exit gas, by once absorbing the requirement that is difficult to satisfy on the production technology, produce in order to satisfy, have to use plural serial stage again or increase the lean solution amount greatly, the thing followed is the increase of capital investment and operating cost, when the caloric requirement in respond heat generation or solution is emitted, its cooling system also exists huger, make defectives such as difficulty is installed, therefore above-mentioned form is also difficult applies in industrial production.When gas and liquid flowing during along the static mixer axially-movable, because hybrid element has cutting, spinfunction, to having played stirring action by fluid, and gas cut into minute bubbles, thus gas-liquid contact area and perturbation increased, when strengthening gas-liquid mass transfer, make thermal boundary layer attenuate greatly again, played the effect of augmentation of heat transfer, thereby the gas absorption process of conducting heat and existing has been arranged again, strengthened absorption with static mixer and have bigger superiority for existing mass transfer.So how, could utilize static mixer to strengthen the advantage of GAS ABSORPTION, overcome the defective that its gas-liquid palpus and stream flow through?

The purpose of this utility model is to address the above problem, and is to absorb this unit operations in the Chemical Manufacture, provide a kind of simple in structure, volume is little, cost is low, stable operation, maintenance cost are low, energy-conservation, water saving, absorption equipment efficiently.

The method of dealing with problems is: strengthen absorption with a plurality of static mixing gas absorbers, gas-liquid flow also flows and overall adverse current to the part in the multistage same tower, tower, and each inter-stage Liquid Flow can not add outer power.The double heat exchanger of doing of while static mixing absorber, absorption reaction and heat exchange are carried out inside and outside same pipe.

The structure of this equipment is shown in figure one.

This figure is three grades, and its progression is the amount doesn't matter as required, and the size between at different levels also can be different, but basic structure is identical.

Ear formula bearing (7) is welded in the secondary gas-liquid separation chamber (6), and this tower is fixed on the support by bearing (7).What weld successively in the secondary gas-liquid separation chamber (6) is three grades of absorbers (4), three grades of separation chambers (2), what weld successively down is secondary absorber (9), one-level separation chamber (13), one-level absorber (18), be connected by catheter (3) with secondary absorber (9) porch in three grades of separation chambers (2), be used for the liquid in high-order separation chamber (2) is sent in the secondary absorber (9), the bottom of secondary separation chamber (6) and one-level absorber (18) is linked to each other by catheter (8), the dividing plate (11) that has the distribution of gas hole, by being bolted on the support ring (12), support ring (12) is welded on the wall (13) of separation chamber.Dividing plate both had been used for distributing gas, be used for bearing the weight of gas-liquid again, redistribution liquid (inject liquid in the absorber herein by the also available liquid distribution trough of structure, dividing plate can be used instead and be sieve plate or screen cloth etc.), guide shell (14) is welded on the barrel wall of absorber (18), tube sheet (16) (on), (21) (descend) to be welded on the cylindrical shell (18) of absorber, the tubulation (19) that static mixing element is housed is fixed on upper perforated plate (16) and the lower perforated plate (21) by welding or expanded and welded tube joint combination, lean solution inlet tube (5) is welded on the top of secondary separation chamber (6), its position is between dividing plate or sieve plate and absorber inlet, by liquid distribution trough or directly liquid is sent in three grades of absorbers (4) by the effect of dividing plate, the gas vent (1) that conforms with technic index after the purification is welded on the top of three grades of separation chambers, mist inlet tube (23) is welded on the porch of one-level absorber (18), cooling water inlet (22), outlet (15) is welded on the bottom and the top of absorber (18) wall respectively, rich solution outlet (17) is welded on the bottom of one-level gas-liquid separation chamber (13), take over (24), (20) be respectively absorber (18) tube side, the discharging tube of shell side, tube sheet (10) is welded on the secondary absorber cylindrical shell (9).

Shown in the figure two for to be contained in the tubulation of static mixing element or a section of sleeve pipe, illustrated static mixing element is the kenics type, draw ratio is 2, certainly static mixing element also can be other type such as Sulzer type, the Hi type improves Hi type etc.

Practical example:

The structure of absorption equipment such as figure one, each parameter is specific as follows:

Progression is four.

One-level, secondary, three grades, the structure of level Four absorber are basic identical, and size is as follows:

H＝13400mm

H ₄′＝H ₂′＝H ₃′＝H ₄′＝1600mm

H ₁＝H ₂＝H ₃＝H ₄＝1650mm

t ₁＝10mm，t ₂＝14mm

t ₃＝t ₄＝40mm

d ₁＝d ₂＝800mm

d ₃＝d ₄＝600mm

d ₁′＝d ₂′＝1200mm

d ₃′＝d ₄′＝1000mm

D=57mm(is the pipe of φ 57 * 3.5)

Tubulation number: interior 51 of I and II absorber

Three, the level Four absorber is interior 32

The element form is in the pipe: the kenics type, and 1/d=2 is alternately arranged by left-handed and dextrorotation, two element intersections, the initial line angle is 90 °, shows as figure two.Adorn 16 elements in the every pipe.

This moment, support style can change skirt into.

Under these conditions, this tower can replace producing per year the fixedly secondary tower in 10,000 tons of synthesis ammonia plant carbonization systems, and tower is cleaned in secondary tower and recovery.Its technological process this moment will change to some extent as figure three to be shown.

Soft water adds (shown in a among the figure) by level Four absorber porch, gas-liquid is separated in the separation chamber behind the level Four absorber, liquid enters three grades of gas absorbers by catheter, thereafter three grades of indoor separation of gas-liquid separation, this moment, solution was the weak aqua ammonia that certain degree of carbonisation is arranged, spill out the weak aqua ammonia groove by the b place, concentrated ammonia liquor is added through separating in the secondary separation chamber behind three grades of absorbers by the c place, liquid after the separation enters the one-level absorber by catheter, flow out by the d place with interior 110% through the degree of carbonisation of in the one-level separation chamber, separating liquid this moment behind the absorber, can go king-tower further to absorb gas uses, gas is then entered after multistage absorption by one-level absorber inlet, draw the separation chamber by level Four, wherein every index satisfies production requirement, goes three sections compressions through behind the gas-liquid separator.Show among cooling water route such as the figure that water flows and plays cooling effect between tubulation and in the absorber shell.

The utility model is compared with existing equipment, have mass tranfer coefficient big (being more than three times of filler tower), heat transfer coefficient height (being more than the twice of present bubble type carbonators), stable operation, equipment volume little, simple in structure, make advantage be installed easily, auxiliary equipment is few, maintenance is easy etc. Compare with the absorption system with production capacity of active service, the weight of equipment can reduce about 70%, and is energy-conservation about 20%, water saving about 40%, and also particularly suitable has again the process of heat transfer in existing mass transfer, has higher promotional value.

Claims (2)

1, a kind of GAS ABSORPTION equipment of forming by static mixing absorber (equipment of forming with its shell or chuck by tubulation that static mixing element is housed or single tube) and gas-liquid separation chamber, it is characterized in that having a plurality of (more than two) static mixing absorbers and corresponding with it gas-liquid separation chamber to be connected to form the tower of an integral body successively, it is that also flow and overall adverse current the part that gas-liquid flows in tower, the dividing plate that has the distribution of gas hole can be arranged in that gas-liquid separation is indoor, sieve plate, screen cloth, at static mixing absorber and gas-liquid separation chamber junction one straight tube guide shell can be arranged, (absorber and a separation chamber combine and are one-level the n level, from bottom to top be followed successively by 1,2,3,4, n,) separation chamber bottom and (n-1) level or (n-X) the gas-liquid porch of level (X＞1) absorber catheter is arranged, lean solution can be sent into equipment from the porch of highest or other grade, and rich solution is from gas-liquid separation chamber's discharge of the first order or other grade.

2, by the said absorption equipment of claim 1, the progression that it is characterized in that equipment is more than or equal to 2, and the overall diameter of static mixing absorber is between 30-10000mm, and single-stage length is between 100-20000mm.

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