TW200406248A - The scrubber waste air treatment system and related method - Google Patents

Abstract

A scrubber waste air treatment method is provided for treating the particles and acidic gas, which comprise to input the hardness softened scrubbing liquid to the scrubber; adjust the pH of scrubbing liquid over 10.5 by adding reagent; introduce the waste air into the scrubber; wash the waste air completely with the scrubbing liquid to remove the particles and acidic gas; exhaust the clean air to open air from the gas outlet of the scrubber. The method can enhance the remove efficiency of pollutant and save the waste air treatment cost by raising the pH of scrubbing liquid over 10.5 to increase the reaction for the weak acidic gas. It also employed the water softening apparatus to provide the hardness softened scrubbing liquid without calcium ion and magnesium ion, which can avoid forming the calcium hydroxide and magnesium hydroxide in the scrubber.

Description

200406248 V. Description of the invention (1) TECHNICAL FIELD The present invention relates to an exhaust gas treatment and an exhaust gas treatment system for a scrubber tower. Background note Process waste produced by general industrial processes has an odor. If the waste is not properly treated. In addition, if the concentration of toxic substances in the exhaust gas is likely to endanger factory employees and general civilian air pollutants, air pollution must be used.11 The concentration of toxic substances in the gas is lower than the air pollution control equipment commonly used in the industry for general washing. The tower exhaust gas treatment system manages the exhaust gas. First, the washing liquid is introduced into the washing fruit wheel and sent to the top of the tower. The washing liquid is sprayed from the top of the tower and sprayed evenly and returned to the bottom of the tower. On the other hand, the tower flows upwards and dissolves with the washing liquid (such as particles, acid gas, etc.) into the washing liquid, and is discharged from the top. Because the washing liquid comes into contact with the exhaust gas, it is necessary to replenish the clean washing liquid to the washing tower knee fluid. For the scrubber exhaust gas treatment system, the larger the contact area, the scrubber's exhaust scrubber is usually designed to have a large liquid surface area loss. In order to achieve the above-mentioned purpose, usually in the system, and especially with regard to gas theory, the washing towers that exceed the requirements of the public defense system are installed in the liquid tower and the rear tower. Then, the exhaust gas comes into contact, and it will be brought into the net after being cleaned, and the effect will be included in the minimum washing tower, which will cause the health regulations of the regulatory body. The exhaust gas will be washed in order to be washed. Many of the gases that are made by the tower to exhaust gas are not discharged as well as the washing bar, the poisonous substances will be contained in the gas and the air will be contaminated. In order to control the exhaust gas, one of these systems is used. The method is to recycle the washing liquid through the bottom of the liquid circulation pump. The contaminated body is introduced into the washing by the bottom of the tower. The clean washing liquid and exhaust gas are cleaned.

9954twf.pld Page 6 200406248 V. Description of the invention (2) Packing, in order to increase the exchange area of liquid and gas, filled with different shapes: two unique surface areas, there are: Use, commonly used filler Such as Laxi ring and Bell saddle ring. In general, the “A / ^ ν σ” that is commonly used in the industry! The waste milk treatment system that is not in use is a waste milk knife discharged from each equipment end. Tower waste disposal. However, with the expansion of equipment and production capacity, the waste and exhaust gas generated by the equipment has also increased greatly, which has exceeded the original design of the treatment tower of the washing tower. The consequent result is that the process exhaust gas is not properly treated and escapes to in the air. A well-known improvement technology is to install a local scrubber on the machine side with a full-type scrubbing bar or activated carbon adsorption method to reduce the content of process waste gas, and finally discharge it to the wet scrubber. However, it is limited to the site and cost, and each plant is applicable to install a local washing tower to improve the efficiency of exhaust gas treatment. In addition, the conventional improvement technology is to increase the amount of circulating water to reduce the concentration of acid gas in the circulating water. And the waste water treatment system load, and caused the whole plant water recovery rate to drop sharply, the whole plant water discharge rate to rise sharply and water consumption costs and other issues. In view of this, an object of the present invention is to provide an exhaust gas treatment system and method for a scrubber tower, which can effectively remove the acid gas in the exhaust gas and improve the scrubbing effect of the exhaust gas. The object of the present invention is to provide an exhaust gas treatment system and method for a washing tower. Without the need to install a partial washing tower and increase the circulating water volume of the washing tower, the exhaust gas washing effect can be improved, and the waste treatment can be saved.

Μ 9954twf.Ptd Page 7 200406248 V. Description of Invention (3) ------- This. The present invention provides a washing gas ^ »a H y ^ a first" 'exhaust gas treatment system, which is generally provided by a washing tower, a washing liquid supply device, a ^ device, an exhaust gas injection pipe pan exhaust water water f, Dissolving liquid circulation pump and Jiale feed device are connected to the waste pipe of the washing tower. In the middle, f; t device is installed in the washing tower i: stop, ^ supply the washing liquid to the washing tower; soft water ; Wash solution, and send it to the washing tower; Washing solution cycle ϊί ϊ = ΐ bottom and top, so that washing solution can be cycled in the washing tower%, Jiale device connection 姝, Di w acid test value is greater than PΗ10 5 ^ ΐ =, and control the gas of the washing liquid in the washing tower into the towel of the washing material; the waste pipe is connected to the washing material, so that the waste milk discharge pipe is connected to the washing tower, so that the washing tower The treated gas is discharged into the atmosphere. The present invention uses a dosing device to adjust the acid and alkali of the washing liquid in the washing tower to be ρΗ10 · 5 or more. The acid gas can be sufficient with the strong alkali within the reaction time. The removal rate of hydrogen chloride was increased from 82% to 95% to 100%, and the removal rate of chlorine chloride was increased from 39% to 91% to about 9.93%. Completely solve the problem of sour taste. However, when the pH value of the washing solution is increased to more than 105, the calcium and magnesium ions contained in the second washing solution will form hydroxide ions = calcium hydroxide and magnesium hydroxide Fouling and other factors attached to the inside of the washing tower cause scale formation and blockage of the inside of the washing tower and increase the internal pressure difference. Therefore, the present invention is provided between the washing liquid supply device and the washing tower: The seat is soft and is used to remove the calcium and magnesium ions contained in the washing liquid. The pH value of each liquid is controlled to rise to a washing efficiency of more than 10.5, and one person in the washing tower a ------ -Exhaust treatment 200406248

Moreover, the present invention does not need to install a local washing tower and increase the water consumption, but only needs to set a set of water softening device to improve the efficiency of exhaust gas treatment, thereby saving costs. The present invention also provides a method for treating exhaust gas from a washing tower. This method involves injecting a softened washing liquid into the washing tower. Then add the agent to the washing column to adjust the pH value of the washing solution to be greater than pH 1 0 · 5 and inject the tail gas to the washing; Next, the exhaust gas and the washing liquid are thoroughly mixed to remove the particles and acid gas in the exhaust gas, and then the gas after the washing liquid treatment is discharged. ^ The present invention improves the acid value of the washing liquid to 1 〇 · & In order to increase the neutralization effect of acid and alkali, and the use of a soft water device to remove the circulating scrubber ions, can avoid scaling inside the washing tower and can remove efficiency. Because the present invention does not need to set up a local washing tower and the For example, only a set of water softening device can improve the efficiency of waste gas treatment. Therefore, waste gas treatment can be saved as follows: In order to achieve the above-mentioned object of the present invention, a preferred embodiment is given below. ：: The advantages can be more obvious and easy to understand. 'The following: 〇 The attached drawings are described in detail as shown in the figure: 1 〇: Washing tower 10 2: Washing liquid supply device 1 〇 4: Soft water device 10 6 : Washing liquid circulation pump 10 8: Dosing device

9954twf.ptd 200406248 V. Description of the invention (5) 110 Exhaust gas injection pipe 112 Exhaust gas discharge pipe 114 Exhaust gas 116 Washing liquid 118 Washing liquid spraying device 120 Filling material 122 Acid-base detector 124 The embodiment of the medicine shown in Figure 1 A preferred embodiment of the invention is a scrubber exhaust gas treatment system. Please refer to FIG. 1. The scrubbing tower exhaust gas treatment system of the present invention is at least composed of a scrubbing tower 100, a scrubbing liquid supply device 02, a soft water device 104, a scrubbing liquid circulation pump 106, a dosing device 108, The exhaust gas injection pipe 110 and the exhaust gas discharge pipe 112 are composed of devices. The washing tower 100 includes a tank, which provides space for the exhaust gas 114 to come into contact with the washing liquid 116. Common types of washing tower 100 are, for example, packed tower, bubble tower, spray tower and vent tower. The washing liquid supply device 102 is, for example, connected to a washing tower 100, for supplying the washing liquid 116 to the washing tower 00. The washing liquid 116 includes clean water, tap water, and condensed water. The water softening device 104 is provided in the washing tower i00 and the washing liquid supply device 102, a, and $ to soften the washing liquid 116 and 120 supplied by the washing liquid supply device 102, and the cleaning tower 100 . The soft water setting 104 is, for example, a method for removing mother ions and ballast ions in a washing liquid, and a method for removing about ions and magnesium ions.

200406248 V. Description of the invention (6) The method includes chemical precipitation method or ion exchange method. The inlet end and outlet end of the washing liquid circulation pump 106 are respectively connected to the bottom and the top of the washing tower 100 to circulate the washing liquid 1 6 in the washing tower 100. That is. This washing liquid circulation pump 106 draws the washing liquid 1 + 1 6 from the bottom of the washing tower 100, and sends the washing liquid 1 1 ^ to the top of the washing tower 11 and sprays it through the washing liquid spraying device 11 8 After being in the tower, it dispersed into droplets and flowed back to the bottom of the washing tower 100. The washing liquid was drawn from the bottom of the washing tower 100 and sent to the washing tower, and the washing liquid 1 16 was washed in the washing tower. The service tower circulates within 1,000. Among them, the washing liquid spraying device 1 1 8 can evenly distribute the washing liquid 116 to be sprayed downward, and fully contact the exhaust gas. ^ The dosing device 108 is connected to the washing tower 100, for example, and is used to control the pH value of the circulating washing liquid in the washing tower, for example, the pH is greater than pH. Dosing The medicine added in the device 08 can make the washing liquid and the exhaust gas undergo an acid-base neutralization reaction 'and effectively remove the acidic substances in the exhaust gas. ^ The exhaust gas injection pipe 110 is connected to the washing tower 100, so that an exhaust gas is introduced into the washing. 10 out of 10. Among them, the waste gas 114 to be treated is a mixed acid gas such as hydrogenated hydrogen, hydrogen chloride, and lithocholic acid, or a gas including at least one of them. The exhaust gas exhaust pipe 112 is connected to the washing tower, so that the gas treated by the washing tower 100 is discharged into the atmosphere. Moreover, in order to increase the liquid-gas exchange area, some filling materials (? &Amp; (: 1 ^ 叫) 120) are usually filled in the washing tower 100, and the filling materials have many different shapes, which have their unique surface area available. The designer chooses to use, commonly used packing materials such as Raschig ring and Bell saddle ring. In addition, there is an acid-base detector 1 2 2 in the washing tower.

200406248 V. Description of the invention (7) = ΓΛ22Λ Dosing device for monitoring the acid value of the washing liquid 116, and the strength ... Dosing amount in the first column 100 ·. For example, when the detected pH value is lower than the set value in the i :: status: state, a 'clothing device' is added to the # 送-signal, and the dosing device 108 is turned on, and the medicine is added to the washing tower π. ^ Ming used the dosing device 108 to adjust the alkali value of the washing liquid in the washing tower 100 to be above ρΗ1 0.5, so that the acidic gas can fully react with the strong alkali in the anti-earthen room, thus increasing the acidic gas in the exhaust gas The removal rate completely solves the problem of sour taste. However, when the pH value of the washing solution 116 is increased to 1. " 5 or more, the calcium and magnesium ions contained in the washing solution 116 will form calcium hydroxide and magnesium hydroxide with hydroxide ions, etc. The fouling matter adheres to the inside of the washing tower 100 and causes fouling, which causes the inside of the washing tower 100 to be blocked and the internal pressure difference to rise. Therefore, in the present invention, a water softening device 104 is provided between the washing liquid supply device 102 and the washing bar tower 100 to remove the calcium ions and magnesium ions contained in the washing liquid 116. Under the condition that the pH value of the washing liquid 116 is adjusted to more than 10.5, the treatment efficiency of the exhaust gas 114 is improved, and the washing service can be smoothly operated without scaling. The above describes the scrubber exhaust gas treatment system of the present invention, and then describes the scrubber exhaust gas treatment method disclosed in this embodiment. First, the washing liquid 116 is provided to the washing tower 100, and the washing liquid 116 flows from the top of the tower and is uniformly sprayed by the spraying device 118, and the washing liquid contacting the exhaust gas flows to the bottom and is then washed by the washing The liquid circulation pump 106 is transported to the top of the tower for recycling. Before use, the softening step of the metal ions such as calcium ions and magnesium ions in the washing liquid 116 is performed, and then the agent 1 24 such as liquid alkali is added to adjust the acid of the washing liquid. Check value

9954twf.ptd Page 12 200406248 V. Description of the invention (8) Above 10.5; Then, the exhaust gas 114 to be treated, such as hydrogen fluoride, hydrogen chloride, nitric acid, mixed acid gas or at least one of the gases is introduced into the scrubbing tower from the bottom of the tower. Within 1000, upward flow comes into contact with the washing liquid, and the pollutants in the exhaust gas 114 are dissolved in the washing liquid 116, and the gas purified by the knee washing liquid 116 is discharged from the top of the tower. In the present invention, the acid test value of the washing liquid 1 16 is controlled to be increased to more than 10.5, and the acid gas can fully react with the strong alkali in the reaction time, so that the removal rate of hydrogen chloride can be from 82% to 95%. It is increased to 100%, and the removal rate of hydrogen hydride is increased from 39% to 91% to about 99.93%, which completely solves the problem of sour taste. However, when the acid value of the washing solution is increased to more than 10.5, the scale inside the washing column will begin to fouling ', which will cause the internal pressure difference to rise and cause internal blockage. The reason is that the supplied washing liquid 11 6 itself contains extremely high concentrations of word ions and magnesium ions. When the acid value of s is below 9 · 0, suspended solids of calcium sulfate and magnesium sulfate will be formed without causing scaling. However, when the acid-base value is greater than 10.5, calcium and magnesium ions in the washing liquid 116 and hydroxide ions form scales such as calcium hydroxide and magnesium hydroxide. In order to solve the state where the pH value of the washing liquid is greater than ⑽ 〇 05, the washing liquid supply equipment is installed; before = = π π ut 〇〇, a water softening device 104 is added to remove the value control ㈣ Λ Λ τ ζ ° Λ under the conditions of washing 116 acid corrosion test ice W, Λ Α 'k two exhaust gas treatment efficiency, and the washing tower 100 will not scale and can be smoothly operated. Exhaust gas 5 I:: t ^ from the pH value of Tinan washing liquid to 1 () · 5 to increase the effect on ^ ^, and use a soft water device to remove circulating washing

200406248 V. Description of the invention (9) The calcium ions and magnesium ions contained in the liquid can avoid scaling inside the washing tower and improve the efficiency of exhaust gas removal. Since the present invention does not need to install a local washing tower and increase water consumption, only a set of water softening device can be used to improve the efficiency of exhaust gas treatment, and therefore the cost of exhaust gas treatment can be saved. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes and retouch without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application.

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Claims (1)

200406248 VI. Application Patent Scope 1 · A scrubber exhaust gas treatment system, the system includes at least: a scrubber tower; a scrubber liquid supply device, the scrubber liquid supply device is connected to the scrubber tower to supply a scrubber liquid to the scrubber In the tower; a water softening device, which is disposed between the washing tower and the washing liquid supply device, to soften the washing liquid supplied by the washing liquid supply device and send it to the washing tower; a washing service Liquid circulation pump, the strip washing liquid circulation pump connects the bottom and the top of the washing tower, so that the washing liquid can be circulated in the washing tower; a dosing device, the dosing device is connected to the washing tower, and controls the washing tower The pH value of the washing liquid in the washing tower is greater than pH 10.5; an exhaust gas injection pipe connected to the washing tower so that an exhaust gas is introduced into the washing tower; and an exhaust gas discharge pipe, The exhaust gas exhaust pipe is connected to the washing tower, so that the gas treated by the washing tower is discharged into the atmosphere. 2. The scrubber exhaust gas treatment system according to item 1 of the scope of patent application, further comprising an acid-base detector, the acid-base detector is installed in the scrubber tower to monitor the pH value of the washing liquid . 3. The scrubber exhaust gas treatment system according to item 1 of the patent application scope, further comprising a scrubbing liquid spraying device, the scrubbing liquid spraying device is disposed on the top of the scrubbing tower to spray the scrubbing liquid. 4. The scrubber exhaust gas treatment system according to item 1 of the scope of patent application, wherein the exhaust gas includes at least one of hydrogen fluoride gas, hydrogen chloride gas, and nitric acid gas. 9954twf.ptd Page 16 200406248 6. Scope of patent application 5 • The scrubber tower exhaust gas treatment system as described in item 1 of the scope of patent application, wherein the medicinal unit added to the scrubber tower includes sodium hydroxide. 6. The scrubber exhaust gas treatment system according to item 1 of the scope of the patent application, wherein the scrubber tower includes one of a packed tower, a blister tower, a spray tower and a vent tower. 7. The scrubber exhaust gas treatment system according to item 1 of the scope of the patent application, wherein the scrubber is filled with a Raschig ring. 8. The scrubbing tower exhaust gas treatment system as described in item 1 of the scope of patent application, wherein the washing liquid includes clean water. 9. The scrubber exhaust gas treatment system according to item 1 of the scope of the patent application, wherein the scrubbing liquid includes tap water. 10. The exhaust gas treatment system for a scrubbing tower according to item 1 of the scope of the patent application, wherein the scrubbing liquid includes condensed water. 1 1. A method for treating exhaust gas from a washing tower, the method comprising at least the following steps: providing a washing liquid and subjecting the washing liquid to a softening step; injecting the softened washing liquid into a washing tower; adding a medicament to the washing tower; In the washing tower, the pH value of the washing liquid is adjusted to be greater than pH 105; injecting an exhaust gas into the washing tower; mixing the exhaust gas with the washing liquid; and discharging the gas treated by the washing liquid. 1 2. The scrubber exhaust gas treatment party as described in item 11 of the scope of patent application 9954twf.ptd Page 17 200406248 VI. Patent Application Law, where the exhaust gas includes at least one of hydrogen fluoride, hydrogen chloride gas, and nitric acid gas. 1 3. The method for treating exhaust gas from a scrubbing tower as described in item 11 of the scope of the patent application, which further comprises monitoring the pH value of the washing liquid to control the pH value of the washing liquid to be maintained at pH above 0.5. 14. The method for treating exhaust gas from a scrubbing tower as described in item 11 of the scope of patent application, wherein the agent comprises sodium hydroxide. 1 5. The scrubber exhaust gas treatment method according to item 11 of the scope of the patent application, wherein the scrubber tower includes one of a packed tower, a blister tower, a spray tower and a vent tower. 1 6. The method for treating exhaust gas from a scrubbing tower as described in item 11 of the scope of the patent application, wherein the scrubbing tower is filled with a Raschig ring. 1 7. The method for treating exhaust gas from a scrubbing tower as described in item 11 of the scope of the patent application, wherein the scrubbing liquid includes clean water. 1 8. The method for treating exhaust gas from a scrubbing tower according to item 11 of the scope of the patent application, wherein the scrubbing liquid includes tap water. 19. The method for treating exhaust gas from a scrubbing tower as described in item 11 of the scope of the patent application, wherein the strip washing liquid includes condensed water. IH 9954twf.ptd Page 18