Flue gas denitrification modularized control device

Abstract

The invention discloses a flue gas denitrification modular control device, which includes an ammonia water filling and storage unit, an ammonia water delivery unit, a soft water delivery unit, and an open field standard bus; the ammonia water filling and storage unit is arranged at the bottom left position, From left to right, there are ammonia water delivery unit, soft water delivery unit, ammonia water filling and storage unit, ammonia water delivery unit and soft water delivery unit are connected by open field standard bus; there is a left mixing distribution unit on the upper left side 1. The right hybrid distribution unit, a control management unit is arranged on the right side of the left hybrid distribution unit and the right hybrid distribution unit, and a collection and distribution control unit is arranged on the upper left side of the control management unit. This modular control device for flue gas denitrification greatly enhances the safety performance of the modular control system, reduces the waste of cable resources, shortens the installation and commissioning period, and prolongs the service life of equipment and meters.

Description

technical field [0001] The invention belongs to the technical field of desulfurization and denitrification flue gas denitrification selective non-catalytic reduction system, and in particular relates to a flue gas denitrification modular control device. Background technique [0002] Selective non-catalytic reduction (SNCR) refers to the reduction of nitrogen oxides in the flue gas to harmless nitrogen and water by spraying a reducing agent in the "temperature window" suitable for denitrification reaction without the action of a catalyst. Generally, ammonia, urea or hydrogen acid in the furnace is used as the reducing agent to reduce NOx. The reducing agent only reacts with NOx in the flue gas, and generally does not react with oxygen. This technology does not use a catalyst, so this method is called a selective non-catalytic reduction method; since this process does not use a catalyst, it must be added in the high temperature area. agent (ammonia). [0003] The electrical ...

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Problems solved by technology

[0004] The traditional centralized control method in the prior art has the following problems: 1. The level of electric shock protection is not high: because the distance between the equipment and the control cabinet is too far, the protection level of the protective electrical appliances is greatly reduced; 2. The explosion-proof level cannot be guaranteed: because ammonia water belongs to It is volatile and produces explosive gas, and it is very easy to form an explosion hazard area around the ammonia tank. Due to the distance from the power distribution room, if the protective performance of the protective electrical equipment is reduced, sparks are generated due to poor contact during the production process, which is prone to explosion hazards; 3. Resources Waste: For example, if a 5.5KW motor is used on site, if micro-break short circuit and ground fault protection are used, the cable should be 4×2.5mm 2 , the safe use distance is no more than 91 meters. In the traditional centralized mode, the distance between the mixed distribution power supply and the power distribution cabinet is generally greater than 100 meters. In this way, when a fault occurs, the circuit breaker cannot play a protective role.

If you want to achieve a good level of protection, the cable must increase the cross-sectional area of ​​the cable, which will cause a waste of resources

In addition, even if the protection level can meet the requirements, all control cables are hard-wired, and the length of each cable is very long, which will cause waste; 4. The installation period is long: the traditional denitrification installation and commissioning work needs to be done on site In this way, the installation and commissioning period will be relatively long

Moreover, if there is an unreasonable design on site, it will take a long time to modify and deal with it on site, which will also prolong the time for equipment installation and debugging; When the cable length is relatively long, the line voltage drop will increase, and the terminal voltage of the equipment is low and easy to fluctuate. In this way, the long-term operation of the instrument under the condition of unstable voltage will reduce the service life; In the long run, the service life will be reduced due to the influence of dust; the inventor has developed a flue gas denitrification modular control device based on the defects in the prior art, which can well solve the problems existing in the prior art

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