Method for controlling pH value of spray slurry in magnesium-based seawater process ship desulfurization system

A desulfurization system and control method technology, applied in the field of flue gas desulfurization, can solve problems such as increased equipment corrosion, low desulfurization efficiency, system wear and enhanced precipitation, and achieve the effect of up-to-standard operation

Active Publication Date: 2012-12-26
江苏合益环境工程有限公司
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Problems solved by technology

If the slurry pH is too high, it will affect the Mg(HSO 3 ) 2 generation, reducing the utilization of absorbent, while SO 3 2- A large amount of generation will increase the wear and precipitation of the system; if the pH value is low, the desulfurization efficiency will be low, and the corrosion of equipment will also increase

Method used

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  • Method for controlling pH value of spray slurry in magnesium-based seawater process ship desulfurization system
  • Method for controlling pH value of spray slurry in magnesium-based seawater process ship desulfurization system
  • Method for controlling pH value of spray slurry in magnesium-based seawater process ship desulfurization system

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the examples.

[0020] On a container ship, the pH value control system of the spray slurry is used to control SO 2 Removal effect test. Use fuel oil with a sulfur content of 0.71-0.93% m / m, normal sea navigation, the air volume of exhaust gas emitted by the main engine is about 50,000m 3 / h. The device is powered by 440V, 60Hz three-phase AC ship power, and the induced air volume is less than 10000m 3 / h, the power of the induced draft fan is adjustable from 10 to 30kW, the power of the slurry frequency conversion pipeline pump is adjustable below 3kW, the pressure is 3.5 to 4.0atm, and the slurry supply flow rate is 0.1 to 1.0m 3 / h adjustable (Mg(OH) 2 The slurry concentration is less than 25%). The power of the circulating spray pump is adjustable from 10 to 30kW, and the slurry spray is less than 100m 3 / h is adjustable. Use two different modes to run continuously for 5 hours respecti...

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Abstract

The invention discloses a method for controlling the pH value of spray slurry in a magnesium-based seawater process ship desulfurization system, which is used for controlling the pH value of spray slurry in the magnesium-based seawater process ship desulfurization system and comprises a variable-frequency pipe pump, a flowmeter, an electrical butterfly valve, a spray pump, a seawater pump, a discharge pump, a spray pipe, a pH meter and other parts. The method is implemented by a multi-path automatic feedback electric appliance control system and comprises controlling fan and butterfly valve linkage, liquid level constancy, spray flow and spray grade, feeding slurry, controlling water inlet and water outlet, testing air volume, SO2 concentration and pH value of the slurry and the like. The pH value of the spray liquid is controlled automatically, and the long-term reliable and standard operation of a desulfurization device is realized.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a method for controlling the pH value of spray slurry in a magnesium method and a seawater method desulfurization system. Background technique [0002] Bunker fuel oil has implemented extremely strict sulfur content standards, while allowing ships to use approved emission reduction technologies, provided that SO 2 Emissions equal to or lower than burning 0.10% low-sulfur fuel. The use of fuel oil with low sulfur content will greatly increase the operating cost of ships, so flue gas desulfurization has become the most feasible option to meet the new standards. [0003] Compared with dry and semi-dry methods, wet desulfurization has been widely used due to its mature technology. At present, the most successful desulfurization technology to achieve industrial application is chemical method, including calcium method, magnesium method and seawater desulfurization me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/92B01D53/50
Inventor 朱益民郝阳唐晓佳刘爽李铁
Owner 江苏合益环境工程有限公司
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