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High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal

A technology with simplified control and high alkalinity, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles. It can solve the difficulty of injection volume, and the technical advantages of high efficiency and energy saving of double-alkali desulfurization process are difficult to achieve. There are many changing parameters to achieve the effect of simplifying the control process

Inactive Publication Date: 2010-09-01
吉林安洁环保有限公司
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  • Application Information

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Problems solved by technology

[0004] Although this process has outstanding advantages, the reaction process is not suitable for control, and there are many parameters changed in the process, and the parameters change greatly. Therefore, how to determine and control NaOH and Ca(OH) according to the changes of parameters 2 If the injection volume is not accurate, it is very difficult to achieve the high efficiency and energy-saving technical advantages of the dual-alkali desulfurization process.

Method used

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  • High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal
  • High-alkaline double-alkali simplified desulfuration control method by adding agent at front end of canal

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Embodiment 1

[0012] The technical focus of this method is to control the loss of NaOH during the circulation process and always ensure that a sufficient amount of NaOH participates in the desulfurization reaction.

[0013] There are two ways for the loss of NaOH, one is to be taken away by the desulfurization waste liquid, and the other is to be oxidized into desulfurization sodium (NaOH 2 SO 4 ) and cannot be restored.

[0014] The first loss of NaOH is unavoidable, because the discharged desulfurization slag must contain a certain amount of liquid. This loss does not have to be controlled, it just has to be taken into account when calculating the cost.

[0015] The second loss must take measures to control. The method has two aspects:

[0016] One is to inject Ca(OH) 2 The position of the solution should be as close as possible to the outlet of the desulfurization tower (for multiple desulfurization towers, it can be injected at the outlet of each tower separately), so that it can b...

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Abstract

A high-alkaline double-alkali simplified desulfuration control method by adding an agent at the front end of a canal belongs to the environmental protection technical field. The method comprises the following steps: a. infusing Ca(OH)2 solution at outlets of desulfurizing towers to fully mix with perturbed circulating liquid and perform a displacement reaction with Na2SO3 in the circulating liquid; and b. controlling and keeping the PH value of the circulating liquid at 9-10 in a high-alkaline condition by adjusting the infusion quantity of Ca(OH)2 solution so as to allow sufficient Ca(OH)2 to react with Na2SO3 and then fully displace NaOH. The method has the beneficial effects: the complex control process is simplified and loss caused by oxidation is basically avoided for NaOH so that double-alkali desulfuration process is more feasible and economical in reality, thus really achieving technical advantages of double-alkali desulfuration.

Description

technical field [0001] The invention belongs to the technical field of environmental protection. Background technique [0002] For the double-alkali desulfurization process, although the country has standard technical specifications and requirements, there is no clear and specific control process. There are many cases of double-alkali desulfurization in China, but not many of them are very successful. The key to the problem is the double-alkali desulfurization The process of the process is difficult to control in actual use. [0003] The technical characteristics of double alkali desulfurization are: taking advantage of the high desulfurization efficiency of NaOH, first use NaOH to remove SO in the flue gas 2 removal, but because NaOH is expensive, Ca(OH) needs to be used again 2 NaOH from the desulfurization product Na 2 SO 3 Replace it in the middle, so that NaOH can be used repeatedly, so as to ensure the realization of the purpose of economy and high efficiency. [...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50
Inventor 李严卢长柱白凤艳张东发富强
Owner 吉林安洁环保有限公司
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