Alkali washing tower

Abstract

The utility model relates to an alkaline washing tower. The alkaline washing tower comprises a tower body, a first chimney tower plate, a second chimney tower plate, a third chimney tower plate, a plurality of layers of weak base washing tower plates, a plurality of layers of medium-strong base washing tower plates, a plurality of layers of strong base washing tower plates and a plurality of layers of water washing tower plates. The first chimney tower plate, the second chimney tower plate and the third chimney tower plate can ensure that cracking gas smoothly flows in the tower body so as to remove acid gas, and can also prevent a washing liquid from flowing among all areas, so that the separation effect is ensured. The weak base washing tower plate, the medium-strong base washing tower plate, the strong base washing tower plate and the water washing tower plate are all arranged to be trapezoid corrugated sieve hole tower plates, it is guaranteed that the trapezoid corrugated sieve hole tower plates are laid on the whole cross sectional area in the tower body, the mass transfer area of the alkaline washing tower can be increased, the processing capacity is improved, meanwhile, the trapezoid corrugated sieve hole structures can prevent the tower plates from being blocked, and the service life of the tower is prolonged. Therefore, the alkaline washing tower has the advantages of being large in treatment capacity, good in separation effect, low in pressure drop, not prone to being blocked and long in operation cycle.

Description

Technical Field

[0001] The utility model relates to the technical field of mass transfer and separation, in particular to an alkali washing tower. Background Art

[0002] The main components of cracking gas are hydrogen, methane, ethylene, propylene, carbon dioxide, hydrogen sulfide, etc., and the role of the alkali scrubber is to remove the acid gas (carbon dioxide, hydrogen sulfide) in the cracking gas. The traditional alkali scrubber has problems such as poor separation effect, large pressure drop, easy clogging, and short operation cycle for cracking gas separation. Utility Model Content

[0003] Based on this, it is necessary to provide an alkali washing tower with large processing capacity, good separation effect, low pressure drop, not easy to be blocked and long operation cycle.

[0004] An alkali washing tower comprises a tower body, a first chimney tower plate, a second chimney tower plate, a third chimney tower plate, a multi-layer weak alkali washing tower plate, a multi-layer medium-strong alkali washing tower plate, a multi-layer strong alkali washing tower plate and a multi-layer water washing tower plate;

[0005] The tower body is a long cylindrical structure with a relative top and bottom; the first chimney plate, the second chimney plate and the third chimney plate are sequentially arranged in the tower body from bottom to top to separate the space in the tower body into a weak alkali zone, a medium-strong alkali zone, a strong alkali zone and a water washing zone; the first chimney plate, the second chimney plate and the third chimney plate are all constructed to prevent the liquid in the upper area from flowing downward and to allow the gas in the lower area to enter the upper area; the top is provided with an air outlet connected to the water washing zone; the side wall of the tower body is sequentially provided with a first liquid inlet connected to the water washing zone, a second liquid inlet connected to the strong alkali zone, a third liquid inlet connected to the medium-strong alkali zone, a fourth liquid inlet connected to the weak alkali zone and an air inlet connected to the weak alkali zone from top to bottom;

[0006] The multiple layers of the weak alkali wash tray are arranged in the weak alkali zone; in the longitudinal direction of the tower body, the multiple layers of the weak alkali wash tray are located between the fourth liquid inlet and the air inlet; the multiple layers of the medium-strong alkali wash tray are arranged in the medium-strong alkali zone and are located below the third liquid inlet; the multiple layers of the strong alkali wash tray are arranged in the strong alkali zone and are located below the second liquid inlet; the multiple layers of the water wash tray are arranged in the water wash zone and are located below the first liquid inlet;

[0007] Among them, the weak alkali wash tower plate, the medium-strong alkali wash tower plate, the strong alkali wash tower plate and the water wash tower plate are all trapezoidal corrugated sieve hole tower plates; the trapezoidal corrugated sieve hole tower plates include multiple tower plate pieces; multiple sieve holes are formed on the tower plate pieces; the tower plate pieces are trapezoidal corrugated plates.

[0008] The above-mentioned alkali washing tower is used to remove acidic gas from cracked gas. The arrangement of the first chimney plate, the second chimney plate, and the third chimney plate can ensure that the cracked gas flows smoothly in the tower body to remove acidic gas, and can also avoid the flow of washing liquid between various areas to affect the occurrence of alkali washing effect, thereby ensuring the separation effect. The weak alkali washing tower plate, the medium-strong alkali washing tower plate, the strong alkali washing tower plate, and the water washing tower plate are all arranged as trapezoidal corrugated sieve hole tower plates, and it is ensured that the trapezoidal corrugated sieve hole tower plates cover the entire cross-sectional area in the tower body, which can increase the mass transfer area of ​​the alkali washing tower and improve the processing capacity. At the same time, the trapezoidal corrugated sieve hole structure can avoid clogging of the tower plate and extend the operation cycle of the alkali washing tower. Therefore, the above-mentioned alkali washing tower has the advantages of large processing capacity, good separation effect, low pressure drop, not easy to be blocked, and long operation cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the structure of the alkali washing tower in a preferred embodiment of the utility model.

[0010] Explanation of reference numerals: 100, alkali washing tower; 110, tower body; 111, top; 112, bottom; 113, weak alkali zone; 114, medium-strong alkali zone; 115, strong alkali zone; 116, water washing zone; 117, air outlet; 118, first liquid inlet; 119, second liquid inlet; 1101, third liquid inlet; 1102, fourth liquid inlet; 1103, air inlet; 120, first chimney plate; 121, first liquid collecting trough; 122, first chimney channel; 123, first liquid retaining plate; 124, first liquid guide tube; 125, fourth liquid retaining plate; 126, first liquid sealing plate; 130, second chimney plate; 131, second liquid collecting trough; 132, second chimney channel; 133, second Liquid baffle plate; 134, second liquid guide pipe; 135, fifth liquid baffle plate; 136, second liquid sealing plate; 140, third chimney plate; 141, third liquid collecting tank; 142, third chimney channel; 143, third liquid baffle plate; 150, weak alkali washing plate; 160, medium and strong alkali washing plate; 170, strong alkali washing plate; 180, water washing plate; 191, first liquid inlet pipe; 192, second liquid inlet pipe; 193, third liquid inlet pipe; 194, fourth liquid inlet pipe; 195, first spray mechanism; 196, second spray mechanism; 197, third spray mechanism; 198, fourth spray mechanism; 201, air inlet pipe; 2011, air inlet tank; 202, first demister; 203, second demister. DETAILED DESCRIPTION

[0011] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0012] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0013] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.

[0014] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0015] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0016] See also Figure 1 The alkali washing tower 100 in the preferred embodiment of the utility model is used to remove acid gas from cracking gas. The alkali washing tower 100 includes a tower body 110, a first chimney tower plate 120, a second chimney tower plate 130, a third chimney tower plate 140, a multi-layer weak alkali washing tower plate 150, a multi-layer medium-strong alkali washing tower plate 160, a multi-layer strong alkali washing tower plate 170 and a multi-layer water washing tower plate 180.

[0017] The tower body 110 is a long cylindrical structure, having a top end 111 and a bottom end 112 opposite to each other. When the alkali washing tower 100 is located on a horizontal plane, the top end 111 and the bottom end 112 are respectively the upper end and the lower end of the tower body 110. The cross-sectional shape of the tower body 110 can be circular, elliptical, etc., which are not limited here.

[0018] The first chimney plate 120, the second chimney plate 130 and the third chimney plate 140 are sequentially arranged in the tower body 110 from bottom to top to separate the space in the tower body 110 into a weak alkali area 113, a medium-strong alkali area 114, a strong alkali area 115 and a water washing area 116. The first chimney plate 120, the second chimney plate 130 and the third chimney plate 140 are all configured to prevent the liquid in the upper area from flowing downward and to allow the gas in the lower area to enter the upper area. The top 111 is provided with an outlet 117 connected to the water washing area 116. The side wall of the tower body 110 is provided with, from top to bottom, a first liquid inlet 118 connected to the water washing zone 116, a second liquid inlet 119 connected to the strong alkali zone 115, a third liquid inlet 1101 connected to the medium-strong alkali zone 114, a fourth liquid inlet 1102 connected to the weak alkali zone 113 and an air inlet 1103 connected to the weak alkali zone 113.

[0019] The multi-layer weak alkali washing tray 150 is arranged in the weak alkali zone 113. In the longitudinal direction of the tower body 110, the multi-layer weak alkali washing tray 150 is located between the fourth liquid inlet 1102 and the air inlet 1103. The multi-layer medium-strong alkali washing tray 160 is arranged in the medium-strong alkali zone 114 and is located below the third liquid inlet 1101. The multi-layer strong alkali washing tray 170 is arranged in the strong alkali zone 114 and is located below the second liquid inlet 119. The multi-layer water washing tray 180 is arranged in the water washing zone 116 and is located below the first liquid inlet 118. Specifically, the multi-layer trays are arranged at intervals along the longitudinal direction of the tower body 110. Specifically, the weak alkali washing tray 150, the medium-strong alkali washing tray 160, the strong alkali washing tray 170, and the water washing tray 180 are all horizontally spread over the entire cross-sectional area in the tower body 110.

[0020] In order to obtain a better separation effect, specifically, the number of layers of the weak alkali washing tray 150 is 10, the number of layers of the medium-strong alkali washing tray 160 is 10, the number of layers of the strong alkali washing tray 170 is 25, and the number of layers of the water washing tray 180 is 5. Of course, in other embodiments, the weak alkali washing tray 150, the medium-strong alkali washing tray 160, the strong alkali washing tray 170 and the water washing tray 180 can also select other numbers of layers and other relationships of the number of layers, as long as the alkali washing tower 100 can achieve the removal of acid gas in the cracking gas.

[0021] Among them, the weak alkali washing tray 150, the medium-strong alkali washing tray 160, the strong alkali washing tray 170 and the water washing tray 180 are all trapezoidal corrugated sieve trays. The trapezoidal corrugated sieve trays include a plurality of trays (not shown). A plurality of sieve holes are formed on the trays. The trays are trapezoidal corrugated plates.

[0022] Specifically, the plate thickness of the tower plate is 1 mm to 1.5 mm, the wavelength of the trapezoidal corrugation of the tower plate is 15 mm to 20 mm, and the corrugation height of the trapezoidal corrugation of the tower plate is 3 mm to 10 mm. It should be noted that the wavelength of the trapezoidal corrugation refers to the distance between two adjacent trapezoidal corrugation grooves or two adjacent trapezoidal corrugation edges; the corrugation height of the trapezoidal corrugation refers to the distance between the highest point and the lowest point of the trapezoidal corrugation.

[0023] For ease of understanding, the working process of the alkali washing tower 100 is briefly described below:

[0024] (1) adding water, a washing liquid with the highest concentration, a washing liquid with a relatively high concentration, and a washing liquid with the lowest concentration to the water wash tray 180, the strong alkali wash tray 170, the medium-strong alkali wash tray 160, and the weak alkali wash tray 150 through the first liquid inlet 118, the second liquid inlet 119, the third liquid inlet 1101, and the fourth liquid inlet 1102, respectively, to form a liquid layer of a certain height on each tray, and the water or washing liquid is eluted downward to the lower tray through the sieve holes;

[0025] (2) The cracked gas enters the bottom of the tower body 110 through the gas inlet 1103, and first enters the weak alkaline zone 113 to countercurrently contact with the washing liquid on the weak alkaline washing tray 150 to achieve mass transfer separation. The acid gas in the cracked gas reacts with the washing liquid and is removed from the gas phase;

[0026] (3) The cracked gas leaving the weak alkali zone 113 enters the medium-strong alkali zone 114 through the first chimney tray 120 and contacts the washing liquid on the medium-strong alkali washing tray 160 in countercurrent flow to further remove the acid gas in the cracked gas;

[0027] (4) The cracked gas leaving the medium-strong alkali zone 114 enters the strong alkali zone 115 through the second chimney tray 130 and contacts the washing liquid on the strong alkali washing tray 170 in countercurrent flow to further remove the acid gas in the cracked gas;

[0028] (5) the cracked gas leaving the strong alkaline zone 115 enters the water washing zone 116 through the third chimney tray 140 and contacts with the water on the water washing tray 180 in countercurrent flow to remove the washing liquid entrained in the gas phase of the cracked gas;

[0029] (6) The cracked gas leaving the water washing zone 116 enters the next process through the gas outlet 117.

[0030] The washing liquid is an alkaline washing liquid. Specifically, in this embodiment, the washing liquid is sodium hydroxide. Of course, in other embodiments, the washing liquid can also be other strong alkaline washing liquids, as long as the acid gas can be removed from the cracked gas. Specifically, the washing liquid in the weak alkaline area 113 is 1%-5% (wt%) sodium hydroxide solution, the washing liquid in the medium-strong alkaline area 114 is 5%-8% (wt%) sodium hydroxide solution, and the washing liquid in the strong alkaline area 115 is 8%-10% (wt%) sodium hydroxide solution.

[0031] Therefore, the alkali washing tower 100 performs three alkali washing separations and one water washing separation on the cracked gas to achieve the purpose of completely removing the acid gas and reduce the probability of entrainment of washing liquid in the cracked gas after alkali washing, thereby greatly improving the separation effect of the cracked gas.

[0032] Among them, the arrangement of the first chimney tray 120, the second chimney tray 130, and the third chimney tray 140 can ensure that the cracking gas flows smoothly in the tower body 110 to remove the acid gas, and can also avoid the flow of the washing liquid between the various regions to affect the alkali washing effect, thereby further improving the separation effect. The weak alkali washing tray 150, the medium and strong alkali washing tray 160, the strong alkali washing tray 170, and the water washing tray 180 are all arranged as trapezoidal corrugated sieve trays, and the trapezoidal corrugated sieve trays are ensured to cover the entire cross-sectional area in the tower body 110, which can increase the mass transfer area of ​​the alkali washing tower 100 and improve the processing capacity. At the same time, the trapezoidal corrugated sieve hole structure can avoid the clogging of the tray and extend the operation cycle of the alkali washing tower 100. Therefore, the above-mentioned alkali washing tower 100 has the advantages of large processing capacity, good separation effect, low pressure drop, not easy to be blocked, and long operation cycle.

[0033] In some embodiments, a first liquid collecting tank 121 and a first chimney channel 122 are formed on the side of the first chimney tray 120 facing the medium-strong alkali washing tray 160. The first chimney channel 122 connects the weak alkali area 113 and the medium-strong alkali area 114. A first liquid retaining plate 123 spaced from the first chimney channel 122 is also provided on the side of the first chimney channel 122 facing the medium-strong alkali washing tray 160. The orthographic projection of the first liquid retaining plate 123 in the longitudinal direction of the tower body 110 completely covers the opening of the first chimney channel 122.

[0034] Therefore, the first liquid collecting tank 121 is used to receive the washing liquid flowing down from the medium-strong alkali washing tower plate 160, and the first chimney channel 122 can ensure that the cracking gas can smoothly enter the medium-strong alkali zone 114 from the weak alkali zone 113, and the first liquid baffle plate 123 can prevent the washing liquid from entering the first chimney channel 122.

[0035] A second liquid collecting tank 131 and a second chimney channel 132 are formed on the side of the second chimney tray 130 facing the strong alkali washing tray 170. The second chimney channel 132 is connected to the strong alkali area 115 and the medium-strong alkali area 114. A second liquid retaining plate 133 is also provided on the side of the second chimney channel 132 facing the strong alkali washing tray 170, which is spaced from the second chimney channel 132. The orthographic projection of the second liquid retaining plate 133 in the longitudinal direction of the tower body 110 completely covers the opening of the second chimney channel 132.

[0036] The second liquid collecting tank 131 is used to receive the washing liquid flowing down from the strong alkali washing tray 170 , while the second chimney channel 132 can ensure that the cracking gas can smoothly enter the strong alkali zone 115 from the medium-strong alkali zone 114 , and the second liquid baffle plate 133 can prevent the washing liquid from entering the second chimney channel 132 .

[0037] A third liquid collecting tank 141 and a third chimney channel 142 are formed on the side of the third chimney tray 140 facing the water washing tray 180. The third chimney channel 142 is connected to the strong alkali zone 115 and the water washing zone 116. A third liquid retaining plate 143 is also provided on the side of the third chimney channel 142 facing the water washing tray 180, which is spaced from the third chimney channel 142. The orthographic projection of the third liquid retaining plate 143 in the longitudinal direction of the tower body 110 completely covers the opening of the third chimney channel 142.

[0038] The third liquid collecting tank 141 is used to receive the washing liquid flowing down from the water washing tower plate 180 , while the third chimney channel 142 can ensure that the cracking gas can smoothly enter the water washing zone 116 from the strong alkali zone 115 , and the third liquid baffle plate 143 can prevent the washing liquid from entering the third chimney channel 142 .

[0039] Further, in some embodiments, a first connecting hole (not shown) is provided at the bottom of the first liquid collecting tank 121. The first chimney tower plate 120 further includes a first liquid guide tube 124 which is inserted through the first connecting hole. A fourth liquid baffle plate 125 is provided at an opening of one end of the first liquid guide tube 124 close to the medium-strong alkali wash tower plate 160, and the orthographic projection of the fourth liquid baffle plate 125 in the longitudinal direction of the tower body 110 completely covers the opening of the first liquid guide tube 124. A first liquid sealing tray 126 is provided at an opening of one end of the first liquid guide tube 124 close to the weak alkali wash tower plate 150. One end of the first liquid guide tube 124 close to the weak alkali wash tower plate 150 extends into the first liquid sealing tray 126 and is spaced from the inner wall of the first liquid sealing tray 126.

[0040] A second connecting hole (not shown) is provided at the bottom of the second liquid collecting tank 131. The second chimney tower plate 130 also includes a second liquid guide tube 134 that is inserted through the second connecting hole. A fifth liquid retaining plate 135 is arranged at intervals at the opening of one end of the second liquid guide tube 134 close to the strong alkali washing tower plate 170, and the orthographic projection of the fifth liquid retaining plate 135 in the longitudinal direction of the tower body 110 completely covers the opening of the second liquid guide tube 134. A second liquid sealing plate 136 is provided at the opening of one end of the second liquid guide tube 134 close to the medium-strong alkali washing tower plate 160. One end of the second liquid guide tube 134 close to the medium-strong alkali washing tower plate 160 extends into the second liquid sealing plate 136 and is arranged at intervals from the inner wall of the second liquid sealing plate 136.

[0041] In the longitudinal direction of the tower body 110, the upper end port height of the first liquid guide tube 124 is lower than the upper end port height of the first chimney channel 122, and the upper end port height of the second liquid guide tube 134 is lower than the upper end port height of the second chimney channel 132. It should be explained that the upper end port refers to the port at the end of the component close to the top 111.

[0042] Therefore, during the alkali washing process, the staff can control the height of the liquid in the first trough 121 and the second trough 131 by controlling the liquid extraction amount and / or liquid extraction speed in the first trough 121 and the second trough 131. When the liquid level in the first trough 121 reaches or exceeds the height of the first liquid guide pipe 124, the liquid will overflow into the first liquid guide pipe 124 and flow along the first liquid guide pipe 124 into the weak alkali washing tray 150, thereby replenishing the liquid in the weak alkali area. Similarly, when the liquid level in the second trough 131 reaches or exceeds the height of the second liquid guide pipe 134, the liquid will also enter the medium-strong alkali washing tray 160 through the second liquid guide pipe 134, thereby replenishing the liquid in the medium-strong alkali area.

[0043] Of course, when the liquid level in the first liquid collecting tank 121 is lower than the height of the first liquid guiding tube 124, the liquid remaining in the first liquid sealing plate 126 will act as a liquid seal on the first liquid guiding tube 124; when the liquid level in the second liquid collecting tank 131 is lower than the height of the second liquid guiding tube 134, the liquid remaining in the second liquid sealing plate 136 will act as a liquid seal on the second liquid guiding tube 134.

[0044] In some embodiments, the alkali washing tower 100 further includes a first liquid inlet pipe 191, a second liquid inlet pipe 192, a third liquid inlet pipe 193 and a fourth liquid inlet pipe 194. The first liquid inlet pipe 191, the second liquid inlet pipe 192, the third liquid inlet pipe 193 and the fourth liquid inlet pipe 194 are respectively arranged in the first liquid inlet 118, the second liquid inlet 119, the third liquid inlet 1101 and the fourth liquid inlet 1102, and one end of each of them is located outside the tower body 110. The other ends of the first liquid inlet pipe 191, the second liquid inlet pipe 192, the third liquid inlet pipe 193 and the fourth liquid inlet pipe 194 are respectively located above the water washing tray 180, the strong alkali washing tray 170, the medium-strong alkali washing tray 160 and the weak alkali washing tray 150, and the liquid spraying directions thereof are respectively toward the water washing tray 180, the strong alkali washing tray 170, the medium-strong alkali washing tray 160 and the weak alkali washing tray 150.

[0045] The provision of the first liquid inlet pipe 191, the second liquid inlet pipe 192, the third liquid inlet pipe 193 and the fourth liquid inlet pipe 194 not only facilitates the addition of water and washing liquid into the tower body 110, but also ensures that the water and washing liquid flow directly to the corresponding tower plate, thereby reducing the probability of liquid splashing during the addition of water and washing liquid.

[0046] Furthermore, in some embodiments, a first spray mechanism 195 is further disposed at one end of the first liquid inlet pipe 191 located in the tower body 110 . The first spray mechanism 195 sprays liquid in a direction toward the water-washing tray 180 .

[0047] A second spray mechanism 196 is further provided at one end of the second liquid inlet pipe 192 located in the tower body 110. The second spray mechanism 196 sprays liquid in a direction toward the strong alkali washing tray 170.

[0048] A third spray mechanism 197 is further provided at one end of the third liquid inlet pipe 193 located in the tower body 110. The third spray mechanism 197 sprays liquid in a direction toward the medium-strong alkali washing tray 160.

[0049] A fourth spray mechanism 198 is further disposed at one end of the fourth liquid inlet pipe 194 located in the tower body 110 . The fourth spray mechanism 198 sprays liquid in a direction toward the weak alkali washing tray 150 .

[0050] The arrangement of the first spray mechanism 195, the second spray mechanism 196, the third spray mechanism 197 and the fourth spray mechanism 198 can ensure that water and washing liquid can be evenly sprayed onto their respective corresponding tower plates, so as to ensure that the liquid on the weak alkali washing tower plate 150, the medium-strong alkali washing tower plate 160, the strong alkali washing tower plate 170 and the water washing tower plate 180 is evenly distributed, further improving the separation effect, thereby making the alkali washing effect on the cracking gas better.

[0051] In some embodiments, the alkali washing tower 100 further includes an air inlet pipe 201 passing through the air inlet 1103. One end of the air inlet pipe 201 is located outside the tower body 110, and the other end is located below the weak alkali washing tray 150 in the tower body 110. An air inlet groove 2011 is provided on the side of the air inlet pipe 201 away from the weak alkali washing tray 150.

[0052] Therefore, the air inlet groove 2011 is located at the lower side of the air inlet pipe 201. When in use, after the cracking gas enters the tower body 110 through the air inlet pipe 201, it first flows downward and then flows back upward to enter the weak alkali washing tower plate 150. Therefore, the setting of the air inlet pipe 201 can prevent the cracking gas from directly rushing to the weak alkali washing tower plate 150 after entering the tower body 110, ensuring that the cracking gas enters the weak alkali washing tower plate 150 more smoothly and evenly, ensuring the calmness of the washing liquid on the weak alkali washing tower plate 150, and further improving the separation effect of the cracking gas.

[0053] In some embodiments, the alkali washing tower 100 further includes a first demister 202 disposed in the tower body 110. In the longitudinal direction of the tower body 110, the first demister 202 is located between the gas outlet 117 and the first liquid inlet 118.

[0054] Among them, the first demister 202 is mainly composed of corrugated blades, plates, clamps and other fixing devices, which are used to absorb foam, mist particles, etc. generated by the cracking gas during the water washing process, so as to further remove the liquid entrained in the gas phase of the cracking gas, reduce the liquid content in the cracking gas after the acid gas is removed, and further improve the separation effect.

[0055] In some embodiments, the alkali washing tower 100 further includes a second demister 203 disposed in the tower body 110. In the longitudinal direction of the tower body 110, the second demister 203 is located between the first chimney tray 120 and the second liquid inlet 119.

[0056] The structure of the second demister 203 is the same as that of the first demister 202. The second demister 203 is used to absorb foam, mist particles, etc. generated by the cracking gas during the strong alkaline washing process to reduce the liquid content of the cracking gas before entering the water washing area 116, which helps to further improve the water washing effect and thus make the alkaline washing effect better.

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A caustic washing tower, It is characterized in that It includes a tower body, a first chimney tower plate, a second chimney tower plate, a third chimney tower plate, a multi-layer weak alkali washing tower plate, a multi-layer medium-strong alkali washing tower plate, a multi-layer strong alkali washing tower plate and a multi-layer water washing tower plate; The tower body is a long cylindrical structure with a relative top and bottom; the first chimney plate, the second chimney plate and the third chimney plate are sequentially arranged in the tower body from bottom to top to separate the space in the tower body into a weak alkali zone, a medium-strong alkali zone, a strong alkali zone and a water washing zone; the first chimney plate, the second chimney plate and the third chimney plate are all constructed to prevent the liquid in the upper area from flowing downward and to allow the gas in the lower area to enter the upper area; the top is provided with an air outlet connected to the water washing zone; the side wall of the tower body is sequentially provided with a first liquid inlet connected to the water washing zone, a second liquid inlet connected to the strong alkali zone, a third liquid inlet connected to the medium-strong alkali zone, a fourth liquid inlet connected to the weak alkali zone and an air inlet connected to the weak alkali zone from top to bottom; The multiple layers of the weak alkali wash tray are arranged in the weak alkali zone; in the longitudinal direction of the tower body, the multiple layers of the weak alkali wash tray are located between the fourth liquid inlet and the air inlet; the multiple layers of the medium-strong alkali wash tray are arranged in the medium-strong alkali zone and are located below the third liquid inlet; the multiple layers of the strong alkali wash tray are arranged in the strong alkali zone and are located below the second liquid inlet; the multiple layers of the water wash tray are arranged in the water wash zone and are located below the first liquid inlet; Among them, the weak alkali wash tower plate, the medium-strong alkali wash tower plate, the strong alkali wash tower plate and the water wash tower plate are all trapezoidal corrugated sieve hole tower plates; the trapezoidal corrugated sieve hole tower plates include multiple tower plate pieces; multiple sieve holes are formed on the tower plate pieces; the tower plate pieces are trapezoidal corrugated plates.

2. The alkali washing tower according to claim 1, It is characterized in that A first liquid collecting tank and a first chimney channel are formed on the side of the first chimney plate facing the medium-strong alkali washing plate; the first chimney channel connects the weak alkali area and the medium-strong alkali area; a first liquid baffle plate is also provided on the side of the first chimney channel facing the medium-strong alkali washing plate, which is spaced apart from the first chimney channel; the orthographic projection of the first liquid baffle plate in the longitudinal direction of the tower body completely covers the opening of the first chimney channel; A second liquid collecting tank and a second chimney channel are formed on the side of the second chimney plate facing the strong alkali washing plate; the second chimney channel is connected to the strong alkali area and the medium-strong alkali area; a second liquid baffle plate is also arranged on the side of the second chimney channel facing the strong alkali washing plate, which is spaced from the second chimney channel; the orthographic projection of the second liquid baffle plate in the longitudinal direction of the tower body completely covers the opening of the second chimney channel; A third liquid collecting trough and a third chimney channel are formed on the side of the third chimney tower plate facing the water washing tower plate; the third chimney channel connects the strong alkali zone and the water washing zone; a third liquid baffle plate is also provided on the side of the third chimney channel facing the water washing tower plate, which is spaced apart from the third chimney channel; the orthographic projection of the third liquid baffle plate in the longitudinal direction of the tower body completely covers the opening of the third chimney channel.

3. The alkali washing tower according to claim 2, It is characterized in that A first connecting hole is provided at the bottom of the first liquid collecting tank; the first chimney tower plate further comprises a first liquid guide tube penetrating the first connecting hole; a fourth liquid baffle plate is arranged at intervals at an opening of one end of the first liquid guide tube close to the medium-strong alkali wash tower plate, and the orthographic projection of the fourth liquid baffle plate in the longitudinal direction of the tower body completely covers the opening of the first liquid guide tube; a first liquid sealing tray is arranged at an opening of one end of the first liquid guide tube close to the weak alkali wash tower plate; an end of the first liquid guide tube close to the weak alkali wash tower plate extends into the first liquid sealing tray and is arranged at intervals from the inner wall of the first liquid sealing tray; A second connecting hole is provided at the bottom of the second liquid collecting tank; the second chimney tower plate further comprises a second liquid guide tube penetrating the second connecting hole; a fifth liquid baffle plate is arranged at intervals at an opening of one end of the second liquid guide tube close to the strong alkali washing tower plate, and the orthographic projection of the fifth liquid baffle plate in the longitudinal direction of the tower body completely covers the opening of the second liquid guide tube; a second liquid sealing tray is arranged at an opening of one end of the second liquid guide tube close to the medium-strong alkali washing tower plate; an end of the second liquid guide tube close to the medium-strong alkali washing tower plate extends into the second liquid sealing tray and is arranged at intervals from the inner wall of the second liquid sealing tray; Wherein, in the longitudinal direction of the tower body, the upper end port height of the first liquid guide pipe is lower than the upper end port height of the first chimney channel, and the upper end port height of the second liquid guide pipe is lower than the upper end port height of the second chimney channel.

4. The alkali washing tower according to claim 1, It is characterized in that It also includes a first liquid inlet pipe, a second liquid inlet pipe, a third liquid inlet pipe and a fourth liquid inlet pipe; the first liquid inlet pipe, the second liquid inlet pipe, the third liquid inlet pipe and the fourth liquid inlet pipe are respectively penetrated through the first liquid inlet port, the second liquid inlet port, the third liquid inlet port and the fourth liquid inlet port, and one end of each of them is located outside the tower body; the other ends of the first liquid inlet pipe, the second liquid inlet pipe, the third liquid inlet pipe and the fourth liquid inlet pipe are respectively located above the water washing tower plate, the strong alkali washing tower plate, the medium-strong alkali washing tower plate and the weak alkali washing tower plate, and the liquid spraying directions are respectively towards the water washing tower plate, the strong alkali washing tower plate, the medium-strong alkali washing tower plate and the weak alkali washing tower plate.

5. The alkali washing tower according to claim 4, It is characterized in that A first spray mechanism is also provided at one end of the first liquid inlet pipe located in the tower body; the liquid spraying direction of the first spray mechanism is toward the water washing tower plate; A second spray mechanism is also provided at one end of the second liquid inlet pipe located in the tower body; the spray direction of the second spray mechanism is toward the strong alkali washing tower plate; A third spray mechanism is also provided at one end of the third liquid inlet pipe located in the tower body; the spray direction of the third spray mechanism is toward the medium-strong alkali washing tower plate; A fourth spray mechanism is also provided at one end of the fourth liquid inlet pipe located in the tower body; the liquid spraying direction of the fourth spray mechanism is toward the weak alkali washing tower plate.

6. The alkali washing tower according to claim 1, It is characterized in that It also includes an air intake pipe passing through the air inlet; one end of the air intake pipe is located outside the tower body, and the other end is located below the weak alkali wash tower plate in the tower body; an air intake groove is opened on the side of the air intake pipe away from the weak alkali wash tower plate.

7. The alkali washing tower according to claim 1, It is characterized in that It also includes a first demister disposed in the tower body; in the longitudinal direction of the tower body, the first demister is located between the gas outlet and the first liquid inlet.

8. The alkali washing tower according to claim 1, It is characterized in that It also includes a second demister arranged in the tower body; in the longitudinal direction of the tower body, the second demister is located between the first chimney tower plate and the second liquid inlet.

9. The alkali washing tower according to claim 1, It is characterized in that The number of layers of the weak alkali washing tower plate is 10, the number of layers of the medium-strong alkali washing tower plate is 10, the number of layers of the strong alkali washing tower plate is 25, and the number of layers of the water washing tower plate is 5.

10. The alkali washing tower according to claim 1, It is characterized in that The plate thickness of the tower plate is 1 mm to 1.5 mm, the wavelength of the trapezoidal corrugations of the tower plate is 15 mm to 20 mm, and the corrugation height of the trapezoidal corrugations of the tower plate is 3 mm to 10 mm.

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