Spray drying desulfurizer used for cement plant and process method

Abstract

The invention discloses a spray drying desulfurizer used for a cement plant, which comprises a quick lime storage bunker connected with a quick lime digestive system, wherein the quick lime digestive system comprises a slurry preparation tank and matched stirrer and a slaked lime slurry preparation pump and is used for preparing quick lime into slaked lime to be delivered to a desulfurizer storage and delivery system; the desulfurizer storage and delivery comprises a slaked lime slurry tank and matched stirrer and a slaked lime slurry supply pump and is used for delivering slaked lime slurry in the slaked lime slurry tank to an injection system; the injection system is composed of two sets of distribution pipe networks and a spray gun, the injection point of one set of distribution pipe network is located at a conditioning tower, and the injection point of the other set of distribution pipe network is located at the air inlet flue port of raw mill; and ash produced by desulfurization enters the raw mill. In addition, the invention further discloses a process method utilizing the device to desulfurize. According to the invention, SO2 and SO3 removal rates can reach more than 90%. The system is relatively simple, and can not only meet the environmental protection requirement, but also reduce the desulfurization cost of cement enterprises.

Description

technical field [0001] The invention relates to the field of flue gas desulfurization environmental protection, in particular to a spray drying desulfurization device and process method for cement plants. The invention is suitable for flue gas desulfurization of coal-fired boilers such as cement production lines, building materials, steel, electric power, and petrochemicals. Background technique [0002] At present, there are many flue gas desulfurization devices and processes, most of which have low desulfurization efficiency and cannot meet the emission standards stipulated by the state. The process equipment is complicated and the cost is high. [0003] Chinese patent application CN200510034441 discloses a highly efficient catalytic desulfurization and denitrification method and device. It has the following problems: 1. The system is complex, there are many equipments, the one-time investment is high, and the equipment operation and maintenance costs are high, which is di...

AI Technical Summary

Problems solved by technology

It has the following problems: 1. The system is complex, there are many equipments, the one-time investment is high, and the equipment operation and maintenance costs are high, which is difficult for enterprises to bear; 2. Desulfurization and denitrification reactions need to use catalysts, and the calcium-sulfur ratio of desulfurization reactions is 1.2-1.4 , higher, so the operating costs are higher, affecting the competitiveness of enterprises

It has the following disadvantages: 1. This desulfurization method belongs to wet desulfurization, and it is necessary to install a desulfurization absorption tower and a subsequent desulfurization slag dehydration device. The investment cost, equipment operation and maintenance costs are high, and the recovery period is long; 2. The raw materials for desulfurization are limestone and ammonium sulfate. Drug cost is higher

It has the following problems: As a wet desulfurization process, in addition to desulfurization absorption towers, dust collectors and other high-investment equipment, equipment such as hydrocyclones and plate filters are added, making the total investment, operation and maintenance costs and further increases in difficulty

It has the following disadvantages: 1. Although as a kind of wet desulfurization process that correspondingly transforms the desulfurization absorption tower, it reduces the volume of the desulfurization tower, reduces the desulfurization system cost and desulfurization energy consumption, but compared with the present invention Spray drying method and dry desulfurization process still require high investment and more complicated operation and maintenance; 2. Moreover, it does not process desulfurization waste residue, resulting in a certain waste of resources, and the operating cost is also higher than the method of the present invention

It has the following problems: the desulfurization device and process occupy a small area and the process is simple, and the residence time of the flue gas in the cabin is short, and the contact reaction and drying time with the desulfurizer is short, resulting in a low desulfurization rate and incomplete drying of the reaction product.

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