CN106563335A - Multifunctional membrane absorption tower - Google Patents

Abstract

The invention discloses a multifunctional membrane absorption tower, which comprises a tower body, an air inlet is provided at one end of the tower body, and an air outlet is provided at the other end, and the main process structure includes a temperature adjustment section, a conditioning section, an absorption section and spray cleaning part. The new box-type membrane contact unit relied on by the temperature adjustment section, the conditioning section and the absorption section realizes the heat transfer, mass transfer and absorption of the gas-liquid two-phase, and the spray cleaning section can clean the membrane filaments; the membrane contact units of the absorption section Different components in the gas can be absorbed synchronously or selectively by feeding the same type or different types of absorption liquids. The tower has the characteristics of large gas processing capacity, good integration performance, high operating flexibility, uniform gas-liquid phase distribution, excellent mass transfer and heat transfer effects, convenient loading and unloading, and can absorb and remove different components in the incoming gas simultaneously or separately. It can be applied to the purification treatment fields of coal-fired flue gas and industrial waste gas, as well as membrane contact processes such as liquid degassing/inflating, gas absorption and analysis process, membrane distillation, membrane crystallization, and membrane extraction.

Description

Multifunctional membrane absorption tower

technical field

The invention relates to a gas-liquid two-phase membrane contact mass transfer, heat transfer, tempering and absorption equipment, in particular to a multifunctional membrane absorption tower.

Background technique

Membrane absorption technology has a wide range of applications, and as an important carrier for the industrialization of membrane absorption technology—membrane absorption tower, it has not been paid attention to and developed yet. At present, the membrane absorption carrier for commercial application is a hollow fiber membrane absorber, mostly of tubular or column design, that is, the hollow fiber membrane is packaged in the membrane shell, and the inner cavity of the hollow fiber membrane is called the tube side, and the outer surface of the membrane and the membrane shell The space between them is the shell side, and the two fluids flow through the tube side and the shell side of the membrane absorber respectively. The two phases are not in direct contact, and are separated by the hollow fiber membrane, and are transmitted by the micropores on the surface of the hollow fiber membrane. mass and heat transfer. This type of tubular membrane absorber has small gas-liquid processing capacity, high inlet pressure, high energy consumption, and uneven distribution of gas-liquid phase. Low loss, complex working conditions and other requirements.

The publication number is CN 202020991U, and its publication date is November 2, 2011. The Chinese patent application provides a new type of low air resistance box-type gas-liquid contact membrane absorption unit, including a plurality of sheet-like curtain-type hydrophobic hollow fiber membrane elements , Membrane cleaning parts and boxes. However, on the one hand, the water collection pipes of its multi-sheet curtain hydrophobic hollow fiber membrane elements occupy the internal volume of the unit, resulting in low membrane packing density, low treatment efficiency and capacity; on the other hand, its multi-sheet curtain hydrophobic The hollow fiber membrane elements are independently arranged in parallel inside the unit, and the effect of uniform distribution of fluid diversion needs to be improved.

Invention patent content

The purpose of the present invention is to provide a multifunctional membrane absorption tower. The tower has large gas/liquid processing capacity, good integration performance, high operating flexibility, uniform distribution of gas and liquid phases, can absorb and remove different components in the intake air simultaneously or separately, has excellent mass transfer and heat transfer effects, and is convenient for loading and unloading. Wide industrial applicability, etc., can be applied to liquid degassing/gassing, gas absorption and analysis process, membrane distillation, membrane crystallization, membrane extraction, membrane stripping and other membrane contact processes.

In order to solve the above technical problems, a multifunctional membrane absorption tower proposed by the present invention includes a tower body, one end of the tower body is provided with an air inlet, and the other end of the tower body is provided with an air outlet; Arranged along the vertical direction are a temperature regulation section, a conditioning section, an absorption section and a spray cleaning section; the temperature regulation section, modulation section and absorption section are all modularly integrated with multi-stage box-type membrane contact units, and the multi-stage The box-type membrane contact unit is connected in series or in parallel; the box-type membrane contact unit includes a box body, and the box is provided with a plurality of sheet-like curtain-type hydrophobic hollow fiber membrane elements; The hollow fiber membrane elements are arranged in the box along the vertical surface of the shell-side fluid flow direction; the sheet-like curtain hydrophobic hollow fiber membrane elements include a plurality of hydrophobic hollow fibers woven by hollow fiber porous membrane filaments The diaphragm and the membrane element head sealed at both ends of the multi-piece hydrophobic hollow fiber membrane; the membrane element head is provided with a water collection flow channel, and the two ends of the water collection flow channel are provided with pipe ports; the sheet curtain Type hydrophobic hollow fiber membrane elements are arranged in parallel in the box at equal intervals perpendicular to the flow direction of the shell-side fluid, and the arrangement of the membrane filaments in the adjacent two sheets of curtain type hydrophobic hollow fiber membrane elements The directions are perpendicular to each other; the wall of the box body is provided with through holes corresponding to the positions of all the pipe ports, and each pipe port passes through the corresponding through holes, and is an interference fit with the through holes; The tempering fluid in the tempering section is injected into the hollow fiber porous membrane of the multi-stage box-type membrane contact unit in the tempering section by the tempering fluid pump, and then discharged from the outlet of the tempering fluid; The tempering liquid is injected into the hollow fiber porous membrane filament of the multi-stage box-type membrane contact unit in the conditioning section by the conditioning liquid pump, and then discharged from the outlet of the conditioning liquid; the absorption liquid in the absorption section is injected into the absorption liquid by the absorption liquid pump The hollow fiber porous membrane of the multi-stage box-type membrane contact unit in the section, and then discharged from the outlet of the absorption liquid; the spray cleaning section is composed of a spray device, and the spray device has the following two types One, one is to install nozzles above each box-type membrane contact unit in the absorption section, and the other is to install nozzles on the top or top of the absorption section, so that the membranes in each box-type membrane contact unit in the absorption section The spray cleaning liquid in the spray cleaning section is injected into the spray cleaning section by the spray cleaning pump and sprayed out by the nozzle. export emissions.

Further speaking, the multi-stage box-type membrane contact units have 1 to n stages, and the box-type membrane contact units at all levels are connected in series by vertical stacking.

The box-type membrane contact units at all levels in the absorption section are fed with the same type or different types of absorption liquid.

The hollow fiber porous membrane has a pore diameter ranging from 0.01 μm to 3.0 μm, a wall thickness ranging from 10 μm to 500 μm, an outer diameter ranging from 100 μm to 5000 μm, and a porosity ranging from 30% to 95%.

Through the organic combination of the four functional sections of the temperature adjustment section, conditioning section, absorption section and spray cleaning section, the present invention can realize purification treatment including but not limited to coal-fired flue gas and industrial waste gas, liquid degassing/inflating, gas Membrane contact process of absorption and desorption process, membrane distillation, membrane crystallization and membrane extraction.

Description of drawings

Fig. 1 is the structural representation of multifunctional membrane absorption tower of the present invention;

Fig. 2 is a schematic structural view of the box-type membrane contact unit hollow fiber membrane element used in each functional section shown in Fig. 1;

Fig. 3 is a sectional view of the cut position shown in A-A in Fig. 2;

Fig. 4 is a partial cross-sectional view of the box-type membrane contact unit used in each functional section shown in Fig. 1;

Fig. 5 is a schematic diagram of the appearance of the box-type membrane contact unit shown in Fig. 4;

Fig. 6 is a schematic diagram of the appearance of the box-type membrane contact unit viewed from the opposite direction shown in Fig. 5 .

In the picture:

1- tower body, 2- air inlet, 3- temperature adjustment section, 4- quenching and tempering section, 5- absorption section, 6- spray cleaning section, 7- air outlet, 8- nozzle, 11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, 43, 44, 51, 52, 53, 54, 61, 62, 63, 64, 71, 72, 73, 74, 81, 82, 83, 84-the inlet/outlet of the pipe-side fluid flowing through the water collection channel of the curtain membrane element, 20-sheet-shaped curtain-type hydrophobic hollow fiber membrane element, 30-membrane filament, 40-hydrophobic hollow fiber membrane Sheet, 50-membrane element head, 60-water collection channel, 100-tank, 301-tempering liquid pump, 302-conditioning liquid outlet, 401-conditioning liquid pump, 402-tempering liquid outlet, 501- Absorbing liquid pump, 502-absorbing liquid outlet, 601-spray liquid pump, 602-spray cleaning liquid out, B-shell-side fluid, C1, C2, C3, C4, C5, C6, C7, C8-tube-side fluid .

detailed description

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

As shown in Figure 1, a kind of multifunctional film absorption tower that the present invention proposes comprises tower body 1, and one end of described tower body 1 is provided with air inlet 2, and the other end of described tower body 1 is provided with air outlet 7 ; The main process structure includes four functional sections: temperature adjustment section, quenching and tempering section, absorption section and spray cleaning section. Inside the tower body 1 are vertically arranged a temperature regulation section 3 , a conditioning section 4 , an absorption section 5 and a spray cleaning section 6 . The setting, size and quantity of each functional section of the main process are determined according to the needs of gas processing capacity, temperature, concentration, composition, etc., and each section can be arranged and combined according to the requirements of the gas treatment process, and the order is not limited.

The box-type membrane contact unit, as shown in Figure 2, includes a box body 100, and the box body 100 is provided with a plurality of sheet-like curtain-type hydrophobic hollow fiber membrane elements 20; The fiber membrane element 20 comprises a plurality of hydrophobic hollow fiber membranes 40 woven by hollow fiber porous membrane filaments 30 and membrane element heads 50 sealed at both ends of the plurality of hydrophobic hollow fiber membranes 40; The hollow fiber membrane elements 20 are arranged in parallel in the box 100 at equal intervals perpendicular to the flow direction of the shell-side fluid, and the membrane filaments 30 in the adjacent two sheet-like curtain-type hydrophobic hollow fiber membrane elements 20 The arrangement directions are perpendicular to each other; the wall of the box body 100 is provided with through holes corresponding to the positions of all pipeline ports one by one, and each pipeline port passes through the corresponding through hole, and there is a passage between the through hole and the through hole. surplus cooperation. As shown in Figure 3, the membrane element head 50 is provided with a water collection flow channel 60, and the two ends of the water collection flow channel 60 are provided with pipeline ports. The membrane element heads 50 at both ends of the adjacent two sheet-like curtain-type hydrophobic hollow fiber membrane elements 20 are arranged staggered by 90 degrees, so that eight rows of pipeline ports are formed on the periphery of the multi-sheet-like curtain-type hydrophobic hollow fiber membrane elements 20 .

On the membrane element head 50 at the same end of each sheet-like curtain-type hydrophobic hollow fiber membrane element 20, and a pipe port located in the same column outside the box body 100 is closed with a plug, and each sheet-like curtain-type hydrophobicity is sealed. The membrane element head 50 at the same end of the hollow fiber membrane element 20 and the other pipe port located in the same row outside the box body 100 protrude out of the box body 100 as the inlet/outlet of the tube-side fluid flowing through the water collection channel of the curtain type membrane element. Fig. 4, Fig. 5 and Fig. 6 show the port connection form that 8 sheet-like curtain type hydrophobic hollow fiber membrane elements 20 are accommodated in the box body 100, as shown in Fig. 5, the sheets stacked from top to bottom The curtain-type hydrophobic hollow fiber membrane elements are the 1st, 2nd, 3, 4, 5, 6, 7, and 8 pieces in sequence, and the membrane element head 50 of each piece of curtain-type hydrophobic hollow fiber membrane element 20 is Ports, that is, the four pipeline ports of the first piece are 11, 12, 13, 14, the four pipeline ports of the second piece are 21, 22, 23, 24, and so on, the four pipeline ports of the eighth piece The road ports are 81, 82, 83 and 84. One of the pipe ports 22, 42, 62, 82 on the same side of the same end membrane element head 50 of the 2nd, 4th, 6th, and 8th pieces and the same end membrane element head of the 1st, 3rd, 5th, and 7th pieces A pipeline port 11, 31, 51, 71 on the same side of 5 protrudes from the through hole on the wall of the box body 100 aligned with it as the inlet/outlet of the tube-side fluid flowing through the water collection channel of the curtain membrane element ; As shown in Figure 6, a pipeline port 24, 44, 64, 84 and the 1st, 3, 5, 7th sheets on the same side on the other end membrane element head 50 of the 2nd, 4th, 6th, 8th sheets wherein A pipe port 13, 33, 53, 73 on the same side on the other end of the membrane element head 50 all protrudes from the through hole on the wall of the box body 100 aligned with it as the tube-side fluid flows through the curtain membrane element The inlet/outlet of the water collection channel; the remaining pipeline ports 21, 41, 61, 81, 12, 32, 52, 72, 23, 43, 63, 83, 14, 34, 54 and 74 are closed, as shown in Fig. 5 and Fig. 6 .

As shown in Figures 5 and 6, the outer shape of the box body 100 can be a cube or a cuboid shell. Since the box body is a cube or a cuboid hexahedron, the six walls of the box body 100 are in groups of two. It is arranged directly opposite, wherein a group of opposite walls parallel to the arrangement direction of the sheet-like curtain-type hydrophobic hollow fiber membrane elements are openable box walls, and the remaining four sides of the box walls are continuously closed.

As shown in Figures 5 and 6, the operating mode of the box-type membrane contact unit is that the tube-side fluids C1, C2, C3, C4, C5, C6, C7, and C8 are supplied by ports 24, 44, 64, 84, and 13 respectively. , 33, 53, and 73 enter the middle hole (i.e., the tube side) of the hydrophobic hollow fiber membrane of the multi-sheet curtain-type hydrophobic hollow fiber membrane element, and then respectively pass through the ports 22, 42, 62, 82, 11, 31, and 51 , 71 flow out, and the fluids C1, C2, C3, C4, C5, C6, C7, and C8 can be the same fluid, or different fluids respectively; the shell-side fluid B flows into the box from one side of the box body 100 The shell side formed in the body 100 flows along the vertical direction of the sheet-like curtain-type hydrophobic hollow fiber membrane elements 20 arranged in parallel, and flows through the outer surface of the hydrophobic hollow fiber membrane 30 along the axial direction of the hydrophobic hollow fiber membrane. The two-phase fluids are not in direct contact, and the mass transfer/heat transfer process is carried out with the hydrophobic hollow fiber membrane 30 as the medium.

In the present invention, the gas to be treated in the shell side and the liquid phase in the tube side pass through the contact heat transfer, mass transfer and absorption of the hydrophobic porous membrane material in the membrane contact unit; the hydrophobicity of the same or different materials can be selected for the membrane contact units of each layer. porous membrane. The mentioned hydrophobic porous membrane material is selected from polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl chloride, polysulfone, polyethersulfone, polyarylethersulfone, polyethylene, polypropylene, polyester, silicone rubber, Hollow fiber membrane materials blended or laminated with ceramics, glass, metal, one or more polymers, inorganic non-metals, and metals; the maximum pore size ranges from 0.01 μm to 3.0 μm, and the wall thickness ranges from 10 μm to 500μm, the outer diameter ranges from 100μm to 5000μm; the porosity ranges from 30% to 90%, woven or not, evenly distributed in the new box-type membrane contact unit, and its filling density is the hollow space filled in the membrane contact unit. The percentage of the total volume of the fiber membrane to the volume of the inner space of the membrane contact unit ranges from 1% to 70%.

The temperature regulation section 3 relies on the modular integration of box-type membrane contact units, and can be composed of multi-stage box-type membrane contact units connected in series or in parallel. Its porous hollow fiber membrane has a huge contact area and porosity, which can realize the gas to be treated. Temperature adjustment, heating/cooling to meet the requirements of subsequent processes; the temperature-regulating liquid in the temperature-regulating section 3 is injected into the hollow fiber porous membrane filament 30 of the multi-stage box-type membrane contact unit in the temperature-regulating section by the temperature-regulating liquid pump 301 , and then discharged from the tempering liquid outlet 402, as shown in FIG. 1 .

The conditioning section 4 relies on the modular integration of box-type membrane contact units, and can be composed of multi-stage box-type membrane contact units connected in series or parallel. Regulators (including but not limited to oxidizing agents, reducing agents, acid solutions and alkali solutions) are used to adjust the composition of chemical substances entering the shell side of the multifunctional membrane absorption tower to be treated, so as to meet the requirements of subsequent processes. The conditioning solution of the conditioning section 4 is injected into the hollow fiber porous membrane filament 30 of the multi-pole box-type membrane contact unit in the conditioning section by the conditioning solution pump 401, and then discharged from the conditioning solution outlet 302, as shown in the figure 1.

The absorption section 5 relies on box-type membrane contact units to be modularly integrated, and can be composed of multi-stage box-type membrane contact units connected in series or in parallel. Absorption liquid with specific properties flows into the shell side to realize the removal/recovery of specific chemical components in the gas to be treated in the shell side. The absorption liquid in the absorption section 5 is injected into the multi-stage box-type membrane contact in the absorption section by the absorption liquid pump 501 The hollow fiber porous membrane filament 30 of the unit is then discharged from the absorbent outlet 502 as shown in FIG. 1 .

The temperature adjustment section 3, the modulation section 4 and the absorption section 5 are all modularly integrated with multi-stage box-type membrane contact units, and the box-type membrane contact units on which the temperature adjustment section 3, the conditioning section 4, and the absorption section 5 are based There are 1 to n layers, and each box-type membrane contact unit can be connected in a vertical stacking and series connection; the temperature regulator and the absorption liquid can flow through each layer of membrane contact units in series or in parallel, and each membrane contact unit in the absorption section Different components in the gas can be absorbed synchronously or selectively by feeding the same type or different types of absorption liquids.

The spray cleaning section is set independently; it is composed of spray devices, and the process design can be based on the actual process needs, and can be combined and integrated with the membrane contact units of each functional section of the multifunctional membrane absorption tower. Cleaning of the outer surface of the membrane filament inside the membrane contact unit; parking or online cleaning can be realized. As shown in Figure 1, the spray device has one of the following two forms, one is to arrange nozzles 8 above each stage of box-type membrane contact unit in the absorption section, and the other is to set the nozzle 8 on the top of the absorption section or Nozzles 8 are arranged at the top to clean the membrane filaments 30 in each stage of the box-type membrane contact unit in the absorption section; the spray cleaning liquid in the spray cleaning section 6 is injected into the spray cleaning section by the spray cleaning pump 601, and It is sprayed out from the nozzle 6, and then the spray cleaning liquid is discharged from the spray cleaning liquid outlet 602 arranged at the bottom of the tower.

According to the different intake temperature, composition and concentration of coal-fired flue gas or chemical waste gas, the various components of the membrane absorption tower can be dealt with by using different materials such as temperature resistance, corrosion resistance, acid and alkali resistance, and wear resistance; Moreover, the existence, size and quantity of each section such as the temperature adjustment section, the tempering section, the absorption section and the spray cleaning section of the main process of the present invention are determined according to the needs of gas treatment capacity, temperature, concentration, composition, etc., each section It can be arranged and combined according to the requirements of the gas treatment process, and the order is not limited; the new box-type membrane contact units on which the temperature adjustment section, the quenching and tempering section, and the absorption section are based have 1 to n layers, and each box-type membrane contact unit can adopt a vertical Direct stacking and series connection; the temperature regulator and the absorption liquid can flow through each layer of membrane contact units in series or in parallel, and each membrane contact unit in the absorption section can be fed with the same type or different types of absorption liquid synchronously or selectively Absorb different components in the gas.

The multifunctional absorption tower of the present invention can be applied to separate or synchronous desulfurization of coal-burning flue gas and industrial waste gas through the organic combination of the four functional sections of the temperature adjustment section 3, the conditioning section 4, the absorption section 5 and the spray cleaning section 6. In addition to gas treatment fields such as denitrification, decarburization, and mercury removal, it can also be applied to membrane contact processes such as liquid degassing/inflating, gas absorption and analysis, membrane distillation, membrane crystallization, and membrane extraction.

Although the present invention has been described above in conjunction with the drawings, the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the inspiration, many modifications can be made without departing from the gist of the present invention, and these all belong to the protection scope of the present invention.

Claims (4)

1. a kind of multifunctional film absorption tower, comprises tower body (1), and one end of described tower body (1) is provided with air inlet (2), and the other end of described tower body (1) is provided with air outlet ( 7); characterized in that: In the tower body (1), there are arranged a temperature regulation section (3), a conditioning section (4), an absorption section (5) and a spray cleaning section (6) along the vertical direction; the temperature regulation section (3) , the modulating section (4) and the absorbing section (5) are respectively modularized and integrated with multi-stage box-type membrane contact units, and the multi-stage box-type membrane contact units are connected in series or in parallel; The box-type membrane contact unit includes a box body (100), and the box body (100) is provided with a plurality of sheet-like curtain-type hydrophobic hollow fiber membrane elements (20); a plurality of sheet-like curtain-type hydrophobic hollow fiber membrane elements (20); The fiber membrane element (20) is arranged in the box (100) along the vertical surface of the shell-side fluid flow direction; the sheet-like curtain hydrophobic hollow fiber membrane element (20) includes a plurality of hollow fiber A hydrophobic hollow fiber membrane (40) woven by porous membrane filaments (30) and a membrane element head (50) sealed at both ends of a plurality of hydrophobic hollow fiber membranes (40); the membrane element head (50) A water collection flow channel (60) is provided, and pipe ports are provided at both ends of the water collection flow channel (60); Arranged in parallel at equal intervals in the box (100), and the arrangement directions of the membrane filaments (30) in two adjacent sheet-like curtain-type hydrophobic hollow fiber membrane elements (20) are perpendicular to each other; the box The wall of the body (100) is provided with through holes corresponding to the positions of all the pipe ports one by one, and each pipe port passes through the through hole corresponding to the position, and is an interference fit with the through hole; The temperature-regulating liquid in the temperature-regulating section (3) is injected into the hollow fiber porous membrane silk (30) of the multi-stage box-type membrane contact unit in the temperature-regulating section by a temperature-regulating liquid pump (301), and then, the temperature-regulating liquid is export (402) emissions; The conditioning solution of the conditioning section (4) is injected into the hollow fiber porous membrane silk (30) of the multi-stage box-type membrane contact unit in the conditioning section by the conditioning solution pump (401), and then, the conditioning solution is export (302) emissions; The absorption liquid in the absorption section (5) is injected into the hollow fiber porous membrane filament (30) of the multi-stage box-type membrane contact unit in the absorption section by the absorption liquid pump (501), and then discharged from the absorption liquid outlet (502) ; The spray cleaning section (6) is composed of a spray device, and the spray device has one of the following two forms, one is to set a nozzle (8) above each stage of the box-type membrane contact unit in the absorption section , the other is to set nozzles (8) at the top or top of the absorption section, so as to clean the membrane filaments (30) in each stage of the box-type membrane contact unit in the absorption section; the spray cleaning section (6) The spray cleaning liquid is injected into the spray cleaning section by the spray cleaning pump (601), and sprayed out by the nozzle (6), and then the spray cleaning liquid is discharged from the spray cleaning liquid outlet (602) arranged at the bottom of the tower . 2. The multifunctional membrane absorption tower according to claim 1, characterized in that: the multi-stage box-type membrane contact units have 1 to n stages, and the box-type membrane contact units at all levels are connected in series by vertical stacking. 3. The multifunctional membrane absorption tower according to claim 1, characterized in that: the box-type membrane contact units at all levels in the absorption section are fed with the same type or different types of absorption liquids. 4. The multifunctional membrane absorption tower according to claim 1, characterized in that: the hollow fiber porous membrane (30) has a pore diameter ranging from 0.01 μm to 3.0 μm, a wall thickness ranging from 10 μm to 500 μm, and an outer diameter ranging from 100μm～5000μm; the porosity range is 30%～95%.