The invention belongs to the technical field of a limestone/gypsum wet flue gas desulfurization technology, and particularly relates to an additive for strengthening a wet flue gas desulfurization technology, which comprises the following components in percentage by mass: 35-45% of mixed organic acid, 5-10% of organic acid salt, 6-9% of surfactant, 1-6% of heavy metal salt and 35-45% of dirt dispersion agent; and the mixed organic acid comprises adipic acid, wherein the percentage of mass of the adipic acid in the mixed organic acid is not less than 50%. The additive can be added and used for strengthening the wet flue gas desulfurization technology, improve the desulfurization efficiency of a system, reduce the energy consumption, strengthen oxidization, improve the limestone quality and restrain system scaling, and accordingly, the purposes of energy conservation, consumption reduction and waste recycling are realized.

Additive for strengthening wet flue gas desulfurization technology

The invention relates to an additive, especially relates to an additive used for limestone-gypsum method flue gas desulfurization. The technical problem solved by the invention is in order to provide an additive capable of preventing desulfurization absorption tower scaling, and slurry overflowing, avoiding demister blockage, and improving desulfurization efficiency. In order to solve the above problem, the technical proposal taken by the invention adopts organic acid substance 30-70, metal oxide 10-30, salt substance 5-20, oxidation catalyst 15-35, and antifoaming agent 5-15. The technical proposal has obvious effect in defoaming, scaling reduction, demister blockage, slurry overflowing prevention, and desulfurization efficiency improvement.

Limestone-gypsum wet desulfurization additive

The invention discloses a desulfurization, denitrification and demercuration additive as well as a preparation method thereof. The additive consists of the following components in percentage by weight: 20-80% of accelerants, 5-20% of limestone activating agents, 0.04-1% of catalytic synergists, 0.2-10% of metal oxide and 0.5-15% of surfactants. The additive disclosed by the invention can improve the desulfurization efficiency of an absorption tower, is adaptive to high-sulfur coal and enables the exit concentration of SO2 to reach the standard, and a serum circulation pump can be stopped at varying degrees so as to reach the aim of saving energy; moreover, the additive is easily soluble in water, and has the characteristics of simplicity and convenience in using, no air bubble in the using process and no corrosion to equipment; the desulfurization method for applying the additive not only can be used for reducing the using quantity of limestone, improving the CaSO3 oxidation efficiency and the gypsum purity and the dehydration efficiency of gypsum, but also can be used for reducing the content of NO and Hg in flue gas, and reaches the effects of desulfurization, denitrification and demercuration and flue gas purification.

Desulfurization, denitrification and demercuration additive as well as preparation method thereof

The invention dislocates a method and a system for jointly desulfuration denitration and demercuration by activated coke of a moving bed. The method comprises the following steps of: S1, adding activated coke to a desulfuration demercuration reactor and a denitration demercuration reactor respectively, carrying out desulfuration, denitration and demercuration on smoke, and respectively measuring the SO2 and NOx concentrations and the smoke flow at a smoke inlet; S2, calculating the mass flow of the activated coke required for realizing the target desulfuration and denitration efficiency, and adjusting the real-time mass flow of the flowed and reacted activated coke; S3, sieving out the dust attached by the reacted activated coke and the carbon power generated by self-abrasion; S4, charging the sieved activated coke into an activated coke regenerating reactor to be reacted to obtain regenerated activated coke; and S5, adding the regenerated activated coke into the desulfuration demercuration reactor and the denitration demercuration reactor respectively, and carrying out the circulation of desulfuration, denitration and demercuration. The method can be used for timely adjusting the inflow and outflow mass flow of the activated coke of the desulfuration demercuration reactor and the denitration demercuration reactor, and removing mercury in the smoke.

Method and system for jointly desulfuration, denitration and demercuration by activated coke of moving bed

The invention discloses a catalyst used for oxidation of elementary substance mercury in coal-fired flue gas. The catalyst can achieve efficient catalytic oxidation of the elementary substance mercury, and the catalyst adsorbing the mercury is prone to magnetic separation from fly ash so as to achieve cyclic utilization. The catalyst is characterized in that: the catalyst is formed by loading the surface of a carrier with an active component having good oxidation performance for the elementary substance mercury; the active component is CuCl2; and the carrier relates to magnetic bead particles. The invention also discloses a preparation method of the catalyst and an activation and regeneration method after the catalyst is deactivated. The magnetic bead particles in the fly ash are adopted as the carrier, modified by loading the surface of the carrier with the active catalytic component, and subjected to mercury control, so that economic benefit is good. In particular, the modified magnetic bead particles absorbing the mercury are liable to separate from the fly ash through a magnetic separation technology, and the mercury adsorbed on the surfaces of the magnetic bead particles are controlled in a centralized manner, thus avoiding secondary pollution of the mercury. In addition, regeneration and cyclic utilization of the modified magnetic beads are achieved, and the cost of mercury control is effectively reduced.

A catalyst used for oxidation of elementary substance mercury in coal-fired flue gas, and a preparation method and a regeneration method of the catalyst

The invention discloses a wet desulphurization method for a coal-fired power plant and an additive used by the same. The additive comprises the following components in percentage by weight: 70 to 80 percent of alkyl carboxylates, 5 to 10 percent of limestone active agent, 2 to 10 percent of metallic oxide and 5 to 15 percent of surfactant. The additive of the invention can improve the desulfurization effect of an absorption tower and adapt to high-sulfur coal, so that the outlet concentration of SO2 reaches the standard, and a slurry circulating pump also can be stopped in varying degrees to fulfill the aim of energy conservation; and the additive is dissolved in water easily, and the pH value is neutral, so the additive has the characteristic that the additive is easy and convenient to use, does not have air bubbles in the using process and corrode equipment. By the desulphurization method using the additive, the use amount of limestone can be reduced, the oxidization efficiency and gypsum purity of CaSO3 can be improved, the dehydration efficiency of gypsum can be improved, and NO content and Hg content in smoke also can be reduced to achieve the effects of desulfuration, denitration, demercuration and smoke purifying.

Wet desulphurization method for coal-fired power plant and additive used by same

Recycling system for heat and moisture in flue gas of coal-fired power plant and recycling method of recycling system

The invention discloses a method for removing mercury from smoke in a coal fired power plant and a mercury removing agent used by the same. In the term of the weight percent, the mercury removing agent is prepared from cobalt oxide and copper chloride in a mass ratio of (5-10):1000 through mixing. The mercury removing agent adopted in the invention can be directly used in a limestone- gypsum wet desulphurization system, is simple in use and convenience for use without reconstructing the traditional equipment and is low in cost; and the method for removing mercury by using the mercury removingagent has the advantages of high mercury removing efficiency, difficulty in corrosion to the device, and no generation of secondary pollution, can be used for oxidizing NO in the smoke into NO2 easily dissolved into water, and realizes the effect of removing mercury and NOx simultaneously.

Method for removing mercury from smoke in coal fired power plant and mercury removing agent used by same

The invention discloses a method and a device for continuously monitoring a flue gas acid dew point at the tail part of a coal burning boiler on line. The method comprises the following steps: S1, to-be-detected flue gas at the tail part of the coal burning boiler is cooled to 0 to 4 DEG C in a rapid cooling manner through a flue gas condenser, condensed water is collected and a PH meter is used for measuring the PH value of the condensed water; S3, a flue gas hygrometer is used for measuring the moisture of the flue gas before entering the condenser; and S4, the volume ratio of SO3 to H2O in the flue gas, the volume content of SO3 and a flue gas acid dew point are calculated. According to the invention, the measurement result is converted through an automatic measuring instrument (including the PH meter, the flue gas hygrometera and the signal transmitting device) into electrical signals to be sent to an on-line monitoring system, and the flue gas acid dew point is obtained by calculation and treatment of the system. Therefore, on-line continuous monitoring is achieved, the operation in the entire process is convenient, and the measurement result is accurate; and the data processing speed is fast, and parameters can be provided for on-line control on an industrial device.

Method and device for continuously monitoring flue gas acid dew point at tail part of coal burning boiler on line

The utility model discloses a minimum discharge absorption tower, including absorption tower body, defroster, layer and thick liquid pond spray, this internal bottom of absorption tower is located in the thick liquid pond, this internal upper portion of absorption tower is located to the defroster, sprays a below of locating the defroster in the layer, the below that lower floor sprayed the layer is equipped with the thick liquid distributing plate, every layer of below that sprays the layer all is equipped with the thick liquid guide ring, the defroster comprises three block spine formula defrosters and a set of tubular defroster, and the below of lower floor ridge formula defroster is located to the tubular defroster, is equipped with condensation coalescence system between lower floor's ridge formula defroster and the intermediate level ridge formula defroster. The utility model discloses can get rid of the little micronic dust of particle diameter in power plant's flue gas, effective increasing sprays the coverage rate, improves in the flue gas desorption efficiency of SO2 and dust, can effectively prevent absorption tower body inner wall wearing and tearing, can carry out the water conservancy diversion to the flue gas simultaneously, makes the flue gas flow to spraying the compact district, reduces the pressure loss that the limit wall was located.

Jin Yingshan

Papers

Wet desulphurization method for coal-fired power plant and additive used by same

Recycling system for heat and moisture in flue gas of coal-fired power plant and recycling method of recycling system

Method for removing mercury from smoke in coal fired power plant and mercury removing agent used by same

Method and device for continuously monitoring flue gas acid dew point at tail part of coal burning boiler on line

Minimum discharge absorption tower