Formaldehyde absorption tower

Abstract

The utility model provides a formaldehyde absorption tower which comprises an absorption tower body, multiple layers of trays I are arranged in a tower kettle of the absorption tower body, a filler layer I and a filler layer II are sequentially arranged at the upper part of the trays I, and a broken tray I and a broken tray II are respectively arranged at the lower parts of the filler layer I and the filler layer II; a tower tray II is arranged at the upper part of the filler layer II in the absorption tower body; the tower internals formed by combining the trays and the filler are adopted, and each tray adapts to the working condition of the corresponding position, so that the efficiency of the tower internals is improved, and the tower height is reduced; the absorption tower can be transformed on the basis of an original absorption tower for producing formaldehyde through a silver method, the tower height does not need to be increased, only internal parts are transformed, and transformation investment is saved; the mode of combining the tower tray and the filler ensures that internal parts of the absorption tower are not blocked under the condition that the formaldehyde concentration is more than 50%, and long-period stable operation of the absorption tower is ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical equipment, in particular to a formaldehyde absorption tower. BACKGROUND

[0002] The tail gas circulation silver method is adopted in the production process of formaldehyde, and generally, the two-section absorption plus N-layer tray absorption is adopted in the formaldehyde absorption tower, and the concentration of the crude formaldehyde product is designed to be about 50%; the concentration of the crude formaldehyde product is controlled by the use amount of the desalted water at the top of the formaldehyde absorption tower, if higher concentration of the crude formaldehyde is needed, the use amount of the desalted water needs to be reduced, and the reduction of the desalted water will easily cause the crystallization and self-aggregation of the high-concentration formaldehyde to form particulate matter to block the tower internals at the bottom of the tower and the bottom circulating plate heat exchanger; the blockage will cause the heat exchange effect of the heat exchanger to be reduced, and also cause the absorption effect of the lower internals of the absorption tower to be reduced, which is not conducive to the long-period stable production.

[0003] A formaldehyde absorption tower disclosed in an application No. 200910179967X discloses a technical scheme, the absorption tower comprises a tower kettle, a mixed gas inlet and a finished formaldehyde outlet are arranged at the lower part of the tower kettle, a water inlet and a tail gas outlet are arranged at the upper part of the tower kettle, two layers of fillers are arranged in the tower kettle, a formaldehyde solution circulating pipeline is arranged between each section of the fillers, the mixed gas goes upward, the water goes downward in the displacement process, the formaldehyde in the mixed gas is dissolved into the water to form formaldehyde liquid, the formaldehyde liquid circulates in the two layers of fillers, and the concentration of the formaldehyde can be gradually increased; the patent application increases the gas-liquid contact area through the design of the sectional fillers and the special circulating spraying device, thereby solving the problems of the absorption efficiency and the phenomenon of preventing the formaldehyde from being aggregated in the production of the medium-high-concentration formaldehyde solution.

[0004] Although the above patent adopts the special circulating spraying device design, in the application, the mixed gas in the tower kettle still directly passes through the first filler layer and the second filler layer from bottom to top, and the problems of the blockage of the filler layer and the circulating plate heat exchanger are easily caused, and then the absorption effect of the absorption tower is reduced; therefore, a new technical scheme needs to be provided to solve the above technical problems. Practical new type content

[0005] The application provides a formaldehyde absorption tower, which comprises an absorption tower body, a desalted water feeding pipeline and an exhaust pipeline are arranged on the upper portion of the absorption tower body; a feeding pipeline is connected to the lower portion of the absorption tower body, a formaldehyde extraction pipeline is connected to the tower kettle of the absorption tower body, a plurality of tower trays are arranged in the tower kettle of the absorption tower body, a filler layer one and a filler layer two are sequentially arranged on the upper portion of the first tower tray, a broken tower tray one and a broken tower tray two are respectively arranged on the lower portion of the filler layer one and the filler layer two, and a second tower tray is arranged on the upper portion of the filler layer two; a liquid outlet one is arranged between the broken tower tray one and the bottom of the filler layer one, a liquid inlet one is arranged between the upper portion of the filler layer one and the lower portion of the broken tower tray two, a circulating pipeline one is arranged between the liquid outlet one and the liquid inlet one, a cooler one is arranged on the circulating pipeline one, a liquid outlet two is arranged between the broken tower tray two and the lower portion of the filler layer two, a liquid inlet two is arranged between the upper portion of the filler layer two and the second tower tray, a circulating pipeline two is arranged between the liquid outlet two and the liquid inlet two, and a cooler two is arranged on the circulating pipeline two.

[0006] As a preferred solution, a desalted water pipeline one is arranged between the filler layer two and the broken tower tray two and between the filler layer one.

[0007] As a preferred solution, the first tower tray adopts 5-10 layers of anti-blocking tower trays.

[0008] As a preferred solution, the second tower tray adopts 12-20 layers of anti-blocking tower trays.

[0009] As a preferred solution, the formaldehyde extraction pipeline is connected with a tower kettle circulating pipeline, and the tower kettle circulating pipeline is connected with the upper portion of the uppermost tower tray of the absorption tower body.

[0010] As a preferred solution, a feeding cooler is arranged on the feeding pipeline.

[0011] As a preferred solution, a steam generator is arranged on the front portion of the feeding cooler.

[0012] As a preferred solution, the anti-blocking tower tray comprises a tower tray body, a plurality of spray nozzles are arranged on the tower tray body, a cap cover is arranged on the tower tray body corresponding to the spray nozzles, the cap cover comprises a cap cover body, the length and width of the spray nozzles are smaller than the length and width of the cap cover projected on the tower tray body, a cap cover top plate is arranged on the top portion of the cap cover body, a top gap is formed between the cap cover top plate and the cap cover body, the cap cover body comprises two cap cover plates arranged symmetrically, two side plates are arranged symmetrically between the two cap cover plates, a plurality of turbulence holes are formed in the two side plates, and an inner turbulence plate or an outer turbulence plate is arranged on the upper portion of the turbulence hole on the side plate.

[0013] As a preferred solution, the inner side spoiler plate and the outer side spoiler plate of the adjacent spoiler hole in the horizontal row are staggered.

[0014] As a preferred solution, the angle between the side plate and the vertical plane of the tray is 3°-6°.

[0015] As a preferred solution, the angle between the side plate and the vertical plane of the tray is 4.5°.

[0016] As a preferred solution, the shape of the spoiler hole is the same as the shape of the inner side spoiler plate and the shape of the outer side spoiler plate.

[0017] As a preferred solution, the shape of the spoiler hole is at least one of oval, square, and runway type.

[0018] As a preferred solution, the inner side spoiler plate and the outer side spoiler plate are integrally formed with the side plate.

[0019] As a preferred solution, the inner side spoiler plate is obtained by inwardly impinging the spoiler hole, and the outer side spoiler plate is obtained by outwardly impinging the spoiler hole.

[0020] As a preferred solution, the injection nozzle comprises a rectangular hole, the length and width of the rectangular hole are smaller than the length and width of the projection of the cap on the tray body, and an injection plate is installed at the edge of the rectangular hole, the injection plate is obliquely arranged, and the angle between the injection plate and the vertical plane of the tray body is 3°-6°.

[0021] The present application has the following advantages:

[0022] (1) The tower internals are in the form of a combination of trays and fillers, each tray adapts to the working conditions at its respective position, so that the efficiency of the tower internals is improved and the height of the tower is reduced;

[0023] (2) The original absorption tower for producing formaldehyde by the silver method can be modified without increasing the height of the tower, only the internals are modified, and the modification investment is saved;

[0024] (3) The combination of tray one, tray two, and fillers ensures that the tower internals will not be blocked under a formaldehyde concentration of 50% or more, and ensures the long-term stable operation of the absorption tower;

[0025] (4) The formaldehyde concentration gradient and temperature gradient are distributed inside the tower, and the possibility of crystallization and blockage of formaldehyde under high concentration is controlled. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the present application;

[0027] Figure 2 is a structural schematic diagram of the anti-blocking tray angle one of the present application;

[0028] Figure 3 is the structural diagram of the anti-plugging tray angle two of the present application;

[0029] Figure 4 is the structural diagram of the partial angle one of the present application;

[0030] Figure 5 is the structural diagram of the partial angle two of the present application;

[0031] Figure 6 is the structural diagram of the side plate angle one of the present application;

[0032] Figure 7 is the structural diagram of the side plate angle two of the present application;

[0033] Figure 8 is the diagram of the temperature distribution in the tower of the absorption tower in the prior art;

[0034] Figure 9 is the diagram of the formaldehyde concentration distribution in the tower of the absorption tower in the prior art;

[0035] Figure 10 is the diagram of the temperature distribution in the tower of the absorption tower of the present application;

[0036] Figure 11 is the diagram of the formaldehyde concentration distribution in the tower of the absorption tower of the present application;

[0037] 1, absorption tower body; 2, desalted water feed pipeline; 3, exhaust pipeline; 4, feed pipeline; 5, feed cooler; 6, steam generator; 7, formaldehyde take-off pipeline; 8, tower kettle circulation pipeline; 9, formaldehyde take-off pump; 10, tray one; 11, filler layer one; 12, filler layer two; 13, broken tray one; 14, broken tray two; 15, tray two; 16, liquid outlet one; 17, liquid inlet one; 18, circulation pipeline one; 19, cooler one; 20, circulation pump one; 21, liquid outlet two; 22, liquid inlet two; 23, circulation pipeline two; 24, cooler two; 25, circulation pump two; 26, liquid distributor; 28, tray body; 29, injection nozzle; 30, injection plate; 31, cap body; 32, cap plate; 33, side plate; 34, cap top plate; 35, top gap; 36, turbulence hole; 37, inner turbulence plate; 38, outer turbulence plate; 39, lower gap. DETAILED DESCRIPTION

[0038] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Figures 1 to 11 The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0039] Example One:

[0040] As Figure 1As shown, the present application provides a formaldehyde absorption tower, comprising an absorption tower body 1, the upper part of the absorption tower body 1 is provided with a desalted water feeding pipeline 2 and an exhaust pipeline 3, the desalted water feeding pipeline 2 is used for feeding desalted water, the desalted water flows from the top of the absorption tower body 1 to the bottom of the absorption tower body 1, the lower part of the absorption tower body 1 is connected with a feeding pipeline 4, the feeding pipeline 4 is used for feeding a gas mixture of formaldehyde gas, air (nitrogen, oxygen, noble gas, carbon dioxide, water vapor, dust, sulfur dioxide, nitrogen oxide and other gases and impurities) and the like, preferably, a feeding cooler 5 is arranged on the feeding pipeline 4, because high temperature is not conducive to formaldehyde absorption, the feeding cooler 5 is arranged for cooling the raw material gas and removing part of the heat carried by the raw material gas; a steam generator 6 is arranged at the front of the feeding cooler 5, part of low-pressure steam is produced by using the heat of the raw material for utilization, and the heat utilization efficiency is improved; a formaldehyde extraction pipeline 7 is connected to the tower kettle of the absorption tower body 1, a formaldehyde extraction pump 9 is arranged on the formaldehyde extraction pipeline 7, a tower kettle circulating pipeline 8 is connected to the formaldehyde extraction pipeline 7, and the tower kettle circulating pipeline 8 is connected to the lower part of the absorption tower body 1; a plurality of tower trays one 10 are arranged in the inside of the tower kettle of the absorption tower body 1, preferably, the tower trays one 10 adopt 5-10 layers of anti-blocking tower trays, a plurality of tower trays one 10 are arranged in the tower kettle as a circulating section, part of the formaldehyde product in the circulating section is extracted, part of which is punched into the absorption tower body 1 to continue to circulate and absorb formaldehyde; the formaldehyde concentration in the tower kettle is very high, reaching 50% concentration, and self-polymerization is easy to occur, no cooler is arranged in this circulating absorption section, only circulating absorption is carried out without temperature reduction, the occurrence of self-polymerization is reduced, thereby reducing the possibility of blocking; and the arrangement of the anti-blocking tower trays can further prevent crystallization caused by self-polymerization; a filler layer one 11 and a filler layer two 12 are sequentially arranged at the upper part of the tower trays one 10, a broken tower tray one 13 and a broken tower tray two 14 are respectively arranged at the lower parts of the filler layer one 11 and the filler layer two 12, a tower tray two 15 is arranged in the absorption tower body 1 at the upper part of the filler layer two 12, and a liquid distributor 26 is arranged between the filler layer two 12 and the tower tray two 15; preferably, the tower tray two 15 adopts 12-20 layers of anti-blocking tower trays, the arrangement of the tower tray two 15 can increase the mass transfer efficiency, and also ensures the washing tower effect under the condition of a very small amount of desalted water, so that the formaldehyde content of the outlet gas is reduced to a control value.The liquid outlet one 16 is arranged between the broken tray one 13 and the bottom of the filler layer one 11, the liquid inlet one 17 is arranged between the upper part of the filler layer one 11 and the lower part of the broken tray two 14, the circulating pipeline one 18 is arranged between the liquid outlet one 16 and the liquid inlet one 17, the cooler one 19 and the circulating pump one 20 are arranged on the circulating pipeline one 18, the liquid outlet two 21 is arranged between the broken tray two 14 and the lower part of the filler layer two 12, the liquid inlet two 22 is arranged between the upper part of the filler layer two 12 and the tray two 15, more specifically, the liquid inlet two 22 is connected with the liquid distributor 26, the circulating pipeline two 23 is arranged between the liquid outlet two 21 and the liquid inlet two 22, the cooler two 24 and the circulating pump two 25 are arranged on the circulating pipeline two 23; the formaldehyde concentration is controlled by the high-efficiency large-flux filler layer one 11, the filler layer two 12, and the broken tray one 13 corresponding to the filler layer one 11 and the broken tray two 14 corresponding to the filler layer two 12, and the formaldehyde is absorbed by liquid circulation; because the formaldehyde absorption process is an exothermic reaction, the raw material gas has a certain temperature, so that the whole raw material gas has a certain heat, and a large amount of absorption heat is released in the tower kettle absorption, and all these heat needs to be removed through heat exchange, the cooler one 19 and the cooler two 24 are arranged to remove the heat, so as to avoid the self-aggregation and the formation of crystalline particles when the temperature changes, and to avoid the occurrence of the blocking phenomenon; the broken tray one 13 and the broken tray two 14 are both provided with a gas phase rising pipe, the upper part of the gas phase rising pipe is provided with a liquid baffle, so as to prevent the liquid falling from the upper layer of the filler from directly entering the gas phase rising pipe, the gas phase rises through the annular gap between the upper edge of the rising pipe and the upper liquid baffle, and after the liquid level of the corresponding broken tray exceeds the gas phase rising pipe, the overflow can flow downward to the lower layer of the corresponding broken tray; specifically, after the liquid level of the broken tray one exceeds the gas phase rising pipe, the overflow flows to the tower kettle of the absorption tower body 1 at the lower part of the broken tray one; after the liquid level of the broken tray two 14 exceeds the gas phase rising pipe, the overflow flows to the filler layer one 11 at the lower part of the broken tray two 14; the structure of the broken tray belongs to mature technology, and the present application does not make any improvement, and specific details are not described here; in the embodiment, the concentration index at the tower bottom can meet the process requirements, the tower bottom is not blocked, the long-period stable operation is ensured, the steam usage of the formaldehyde absorption system is reduced, the steam usage is reduced, and the purpose of energy saving and consumption reduction is achieved.

[0041] The gas mixture enters the tower kettle of the absorption tower body 1 through the feed pipeline 4, the desalted water for absorbing formaldehyde gas flows into the tower kettle of the absorption tower body 1 from the top of the absorption tower body 1, the gas phase in the tower kettle passes through the desalted water liquid layer of the multilayer tray one 10 into the upper layer of the multilayer tray one 10 from bottom to top, the gas-liquid two phases are in full contact, the formaldehyde in the gas phase is dissolved into the desalted water liquid phase, the formaldehyde absorption is realized, the gas phase treated through the multilayer tray one 10 rises to the broken tray one 13, the gas phase enters the packing layer one 11 above the broken tray one 13, the liquid falling of the packing layer one 11 is intercepted on the broken tray one 13, the liquid phase on the broken tray one 13 is recycled into the packing layer one 11 after being cooled, the liquid level on the broken tray one 13 overflows to the tower kettle of the absorption tower body 1 in the lower part of the broken tray one 13 after the gas phase rising pipe; the gas phase rising through the packing layer one 11 enters the packing layer two 12 above the broken tray two 14, the liquid falling of the packing layer two 12 is intercepted on the broken tray two 14, the liquid phase on the broken tray two 14 is recycled into the packing layer two 12 after being cooled, the liquid level on the broken tray two 14 overflows to the packing layer one in the lower part of the broken tray two 14 after the gas phase rising pipe; the gas phase passing through the packing layer two 12 enters the desalted water liquid layer of the upper layer of the multilayer tray two 15 in turn, the desalted water absorbs the formaldehyde in the gas phase, the gas phase after absorbing the formaldehyde is discharged through the exhaust pipeline 3 and enters the subsequent processing flow, the liquid phase enters the tower kettle of the absorption tower body 1 again through the packing layer two 12, the broken tray two 14, the packing layer one 14 and the broken tray one 13; the tower kettle of the absorption tower body 1 generates formaldehyde products, part of the generated formaldehyde products is extracted from the tower kettle of the absorption tower body 1, and part of the generated formaldehyde products is recycled and punched into the upper part of the uppermost tray one 10 in the absorption tower body 1 to absorb the formaldehyde.

[0042] The tray one 10, the packing layer one 11, the packing layer two 12 and the tray two 15 in the embodiment can play a role in absorbing formaldehyde, and a formaldehyde product with higher concentration is obtained.

[0043] Embodiment two:

[0044] The embodiment illustrates the anti-clogging tray, specifically:

[0045] As Figures 2 to 7As shown, the anti-clogging tray comprises a circular tray body 28, a plurality of injection nozzles 29 are arranged on the tray body 28 (only part of the tray body 28 of the embodiment is shown), preferably, the injection nozzles 29 comprise rectangular holes, and an inclined injection plate 30 is arranged at the edge of the rectangular hole to form a reduced diameter, and the included angle between the injection plate 30 and the vertical surface of the tray body 28 is 3°-6°, more preferably 4.5°; the reduced diameter of the injection nozzle 29 can increase the injection force when the gas passes through, enhance the ability of the gas to carry the liquid, increase the rate of liquid circulation, prevent the deposition and caking of particulate matter, and play an anti-clogging role; a cap cover is arranged on the tray body 28 corresponding to the injection nozzle 29, the cap cover comprises a cap cover body 31, the length and width of the injection nozzle 29 are smaller than the length and width of the cap cover projected on the tray body 28, the shape of the cap cover body 31 is not specifically limited, and the skilled person can make a corresponding selection according to the specific circumstances; the cap cover body 31 comprises two cap cover plates 32 arranged symmetrically, the cap cover plates 32 in the embodiment are trapezoidal plates, two side plates 33 arranged symmetrically are arranged between the two cap cover plates 32, the side plates 33 are rectangular plates, and the four plates of the two cap cover plates 32 and the two side plates 33 are formed by welding or the like; a cap cover top plate 34 is arranged at the top of the cap cover body 31, and a top gap 35 is formed between the cap cover top plate 34 and the cap cover body 31; a plurality of turbulence holes 36 are formed in the two side plates 33, and an inner turbulence plate 37 or an outer turbulence plate 38 is arranged on the upper part of the turbulence hole 36 on the side plate 33; more specifically, the inner turbulence plate 37 or the outer turbulence plate 38 is folded inward or outward when the turbulence hole 36 is punched, the inner turbulence plate 37 folded inward forms a turbulence stirring effect, and the outer turbulence plate 38 folded outward controls the horizontal downward injection of the gas-liquid mixture to avoid gas-liquid entrainment, the shape of the turbulence hole 36 is the same as that of the inner turbulence plate 37 and the outer turbulence plate 38, and the shape in the embodiment is preferably a runway type; preferably, the inner turbulence plates 37 and the outer turbulence plates 38 of adjacent turbulence holes 36 in the transverse row are arranged alternately, for example Figure 7 As shown, the first transverse row of turbulence holes comprises six turbulence holes, the first turbulence hole 36 is provided with an outer turbulence plate 38, the second turbulence hole 36 is provided with an inner turbulence plate 37, the third turbulence hole 36 is provided with an outer turbulence plate 38, the fourth turbulence hole 36 is provided with an inner turbulence plate 37, the fifth turbulence hole 36 is provided with an outer turbulence plate 38, and the sixth turbulence hole 36 is provided with an inner turbulence plate 37, so as to realize the alternate arrangement, the inner turbulence plate 37 is arranged on the inner side of the cap cover body 31, and the outer turbulence plate 38 is arranged on the outer side of the cap cover body 31.

[0046] The cap body 31 of the embodiment is installed on the tray body 28 by welding or the like, and a lower gap 39 is formed between the lower part of the cap body 31 and the tray body 28. In actual application, a plurality of cap bodies 31 are uniformly installed on the tray body 28, and each cap body 31 is arranged at a position corresponding to each spray nozzle 29. In the embodiment, the included angle between the side plate 33 and the vertical plane of the tray body 28 is 3°-6°, and more preferably, the included angle between the side plate 33 and the vertical plane of the tray body 28 is 4.5°. The 3°-6° included angle is arranged to make the gas-liquid mixture form a certain downward angle to pass through the outer spoiler plate 38 under the pressure formed in the cap body 31, thereby reducing entrainment of mist.

[0047] The gas enters the cap body 31 from the lower part of the tray body 28 through the spray nozzle 29, and the desalting water enters the cap body 31 from the lower gap 39 during the horizontal flow of the desalting water from the upper part of the tray body 28. The gas carries the liquid and moves upward, continuously absorbing formaldehyde. The gas-liquid mixture that is sprayed out through the spoiler hole 36 on the side plate 33 and the top gap 35 further absorbs formaldehyde under the action of the outer spoiler plate 38. The gas-liquid mixture sprayed out through the top gap 35 contacts the cap top plate 34 and further absorbs formaldehyde.

[0048] During the upward flow of the gas-liquid mixture in the cap body 31 in the embodiment, the gas-liquid mixture is further mixed by the inner spoiler plate 37, and then passes through the outer spoiler plate 38 under the pressure formed in the cap body 31, which is beneficial to the absorption of formaldehyde by the desalting water and reduces entrainment of mist. The reduction of entrainment of mist can make the formaldehyde in the gas phase more fully contact with the desalting water, so that the absorption process is more effective.

[0049] Embodiment three:

[0050] The embodiment is described by comparing the existing silver method formaldehyde absorption tower with the formaldehyde absorption tower of the application, and the advantages of the application are specifically described.

[0051] Table 1 below is the data of the existing silver method formaldehyde absorption tower; and Table 2 is the data of the absorption tower of the application.

[0052]

[0053]

[0054] Table 1

[0055]

[0056]

[0057] Table 2

[0058] According to Table 1, the temperature distribution in the tower of the prior art can be obtained as shown in Figure 8 The formaldehyde concentration distribution in the tower of the prior art can be obtained as shown in Figure 9 According to Table 2, the temperature distribution in the tower of the present application can be obtained as shown in Figure 10 The formaldehyde concentration distribution in the tower of the present application can be obtained as shown in Figure 11 The formaldehyde concentration distribution in the tower of the present application can be obtained as shown in

[0059] Figure 8 , Figure 9 The horizontal coordinate 9 represents the first packing layer, the horizontal coordinate 8 represents the second packing layer, and the horizontal coordinate 7-1 represents the top tray. Figure 8 As can be seen from Table 1 and Figure 8 , Figure 9 As can be seen from Table 1 and

[0060] Figure 10 , Figure 11 The horizontal coordinate 10 represents the first tray 10, the horizontal coordinate 9 represents the first packing layer 11, the horizontal coordinate 8 represents the second packing layer 12, and the horizontal coordinate 7-1 represents the second tray 15. Figure 8 , Figure 9 As can be seen from Table 1 and

[0061] The above-mentioned devices, connection relationships, etc. that are not specifically described are all prior art, and the present application will not be specifically described here.

[0062] The preferred mode of the present application is described in detail above with reference to the drawings, but the present application is not limited to the specific details in the above-described embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all belong to the protection scope of the present application.

[0063] It should also be noted that various technical features described in the above detailed description can be implemented in any suitable combination, and that the application is not limited to any particular combination described.

[0064] Furthermore, various embodiments of the application can also be combined with each other, as long as they do not contradict each other, and the application should be considered to disclose the application as such.

Claims

1. A formaldehyde absorption tower, comprising an absorption tower body (1), wherein a demineralized water feed pipeline (2) and an exhaust pipeline (3) are provided at the upper part of the absorption tower body (1); a feed pipeline (4) is connected to the lower part of the absorption tower body (1); and a formaldehyde extraction pipeline (7) is connected to the bottom of the absorption tower body (1), characterized in that, The absorber body (1) has multiple trays (10) inside. The upper part of the trays (10) is provided with packing layer 1 (11) and packing layer 2 (12). The lower part of packing layer 1 (11) and packing layer 2 (12) is provided with tray 1 (13) and tray 2 (14) respectively. The upper part of packing layer 2 (12) is provided with tray 2 (15) inside the absorber body (1). A liquid outlet (16) is provided between tray 1 (13) and the bottom of packing layer 1 (11). The upper part of packing layer 1 (11) and the lower part of tray 2 (14) are provided with tray 2 (15) inside the absorber body (1). An inlet (17) is provided between the inlet (16) and the outlet (17), and a circulation pipeline (18) is provided between the outlet (16) and the inlet (17). A cooler (19) is provided on the circulation pipeline (18). An outlet (21) is provided between the bottom of the tray (14) and the packing layer (12). An inlet (22) is provided between the top of the packing layer (12) and the tray (15). A circulation pipeline (23) is provided between the outlet (21) and the inlet (22). A cooler (24) is provided on the circulation pipeline (23).

2. The formaldehyde absorption tower according to claim 1, characterized in that, The formaldehyde extraction pipeline (7) is connected to the tower bottom circulation pipeline (8), which is connected to the absorption tower body (1) corresponding to the uppermost tray (10).

3. The formaldehyde absorption tower according to claim 1, characterized in that, The first (10) of the tower tray adopts a 5-10 layer anti-blockage tower tray.

4. A formaldehyde absorption tower according to claim 1, characterized in that, The second (15) tower tray adopts a 12-20 layer anti-blockage tower tray.

5. A formaldehyde absorption tower according to claim 1, characterized in that, A feed cooler (5) is installed on the feed pipeline (4).

6. A formaldehyde absorption tower according to claim 5, characterized in that, A steam generator (6) is provided at the front of the feed cooler (5).

7. A formaldehyde absorption tower according to claim 3 or 4, characterized in that, The anti-clogging tray includes a tray body (28), on which multiple nozzles (29) are provided. A cap is installed on the tray body (28) corresponding to the nozzles (29). The cap includes a cap body (31). The length and width of the nozzles (29) are smaller than the length and width of the cap projected onto the tray body (28). A cap top plate (34) is provided on the top of the cap body (31). There is a top gap (35) between the cap top plate (34) and the cap body (31). The cap body (31) includes two cap plates (32) arranged symmetrically. Two side plates (33) are arranged symmetrically between the two cap plates (32). Multiple turbulence holes (36) are opened on the two side plates (33). An inner turbulence plate (37) or an outer turbulence plate (38) is provided on the side plate (33) above the turbulence holes (36).

8. A formaldehyde absorption tower according to claim 7, characterized in that, The nozzle (29) includes a rectangular hole, the length and width of which are less than the length and width of the cap projected onto the tray body (28). An inclined spray plate (30) is installed at the edge of the rectangular hole, and the angle between the spray plate (30) and the vertical plane of the tray body (28) is 3°–6°.

9. A formaldehyde absorption tower according to claim 7, characterized in that, The inner spoiler plate (37) and the outer spoiler plate (38) of the horizontally adjacent spoiler holes (36) are staggered.

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