The invention belongs to the field of environment protection, and discloses a wet-method flue gas dust removal desulphurization system of a double-circulation Venturi rod tower. The system comprises an adsorption-liquid supplying unit, a flue-gas purification unit and an adsorption-liquid postprocessing unit. The flue-gas purification unit comprises an upper Venturi rod tower section, a lower Venturi rod tower section, a shutter-type separation cone separating the upper Venturi rod tower section and the lower Venturi rod tower section, an upper circulation liquid pool, a lower circulation liquid pool, upper circulation-liquid sprayers, lower circulation-liquid sprayers, and demisters. Flue gas in the upper tower section and flue gas in the lower tower section are in series connection. A circulation-liquid spraying system is operated independently. Dust removal and desulphurization are separately optimized and performed. The "homogenization" gas flow distribution, "gas in liquid" efficient mass transfer, highly-turbulent "self-cleaning", and other effects of Venturi rod layers are fully utilized by the system so as to perform efficient cooling, dust removal desulphurization of the flue gas. The system is advantages by high dust removal desulphurization efficiency, low operation liquid gas ratio, small resistance, less scale, small occupation area, low investment, low operation energy consumption, less discharge of high-salt water, and the like, and is suitable for dust removal and desulphurization for various kinds of flue gas, particularly suitable for processing of high-temperature high-dust high-sulfur flue gas such as regenerated flue gas of a petroleum catalytic cracking device.

Flue gas dust removal desulphurization system of double-circulation Venturi rod tower

The invention discloses a double circulation U-shaped tower desulfurization system and a process. According to the double circulation U-shaped tower desulfurization system, a slurry separation wall is arranged in a slurry pond of a U-shaped desulfurization tower to divide the slurry pond into a front circulation neutralization and oxidization pond and a rear circulation neutralization and oxidization pond, and meanwhile, a front circulation desulfurization region and a rear circulation desulfurization region which are mutually independent are arranged, wherein a front circulation desulfurization system is jointly formed by the front circulation neutralization and oxidization pond, a front circulation pump and the front circulation desulfurization region, and a circulation desulfurization system is jointly formed by the rear circulation neutralization and oxidization pond, a rear circulation pump and the rear circulation desulfurization region; and the double circulation desulfurization system which is relatively independent is formed in the U-shaped desulfurization tower, and the desulfurization of smoke is jointly finished by the double circulation desulfurization system. According to the double circulation U-shaped tower desulfurization system, higher desulfurization efficiency is not only guaranteed, but also the slurry circulation quantity and the system energy consumption are reduced, the height of the desulfurization tower is also reduced due to the overall layout of the U-shaped desulfurization tower, and the double circulation desulfurization system is simplified. The double circulation U-shaped tower desulfurization system is particularly suitable for desulfurizing smoke generated by burning high-sulfur coal, and the desulfurization efficiency can reach higher than 99 percent.

Double circulation U-shaped tower desulfurization system and process

The invention provides a sulfur recycling process for circularly treating low-concentration acidy gas by utilizing liquid sulfur. The sulfur recycling process is characterized by comprising the following steps: mixing atomized liquid sulfur with a H2S acidy gas generated in a coal chemical process, performing Claus combustion by adopting rich oxidation combustion-supporting or air combustion-supporting, performing two-stage Claus reaction on process gas generated in combustion, performing hydrogenation-direct oxidization and wet-process washing on a tail gas generated by the two-stage Claus reaction in sequence, recycling the sulfur produced in the Claus combustion process, the two-stage Claus reaction process and the hydrogenation-direct oxidization process. The sulfur recycling process can be used for guaranteeing the combustion temperature of the raw material acidy gas with a low heat value, and also can be used for decomposing harmful impurities in the raw material acidy gas.

Sulfur recycling process for circularly treating low-concentration acidy gas by utilizing liquid sulfur

The invention relates to a method for removing hydrogen sulfide from gas, and belongs to the technical field of gas purification. The method mainly comprises the steps: firstly introducing the gas containing hydrogen sulfide to a kinetic wave absorber for removing a large amount of hydrogen sulfide, and then entering the gas containing a small amount of hydrogen sulfide to a filled tower for fine desulfurization; converting hydrogen sulfide in the gas into sulfhydryl radical ion in the absorption process by using a complex iron absorbing liquid; oxidizing rich solution absorbing hydrogen sulfide with air for regeneration so as to convert the sulfhydryl radical ion into simple substance sulfur harmless to environment, wherein the treated gas achieves the discharge requirement; and entering the gas containing sulfur into the kinetic wave absorber, and carrying out countercurrent contact with a complex iron desulfurizing liquid sprayed from bottom to top so as to form a stable form layer, so that the absorbing liquid carries out quick rotary cutting, and the gas and liquid are sufficiently contacted, thus the mass transfer efficiency is obviously improved, and the purification requirements that the hydrogen sulfide gas is quickly absorbed, most of hydrogen sulfide is removed by the kinetic wave, and a small amount of hydrogen sulfide in the gas is removed by the filled tower are achieved.

Method for removing hydrogen sulfide from gas

The invention discloses an energy-saving and consumption-reducing magnesium oxide flue gas desulfurization process and an energy-saving and consumption-reducing magnesium oxide flue gas desulfurization device. The device consists of an absorbing tower, a neutralizing tank, a concentration and sedimentation tank, a centrifugal separator and a middle tank, and is characterized in that flue gas directly enters the absorbing tower without passing through a pre-washing tower; a cooling spray layer is arranged in the absorbing tower to cool down the entered flue gas, so that area occupied is reduced; a filtering and slag removing device is arranged behind an extraction pump, so that purity of magnesium sulfide serving as a byproduct is improved; the neutralizing tank is provided with a magnesium hydroxide feed port; and supernatant of the concentration and sedimentation tank and dilute solution separated by the centrifugal separator are used as absorption liquid to newly enter the absorbing tower after passing through the middle tank. The entire desulfurization system has the advantages of simple process, no secondary pollution, low energy consumption and small occupied area and is particularly suitable for enterprises with magnesium oxide resources and small reserved lands.

Energy-saving and consumption-reducing magnesium oxide flue gas desulfurization process and device

The utility model discloses an optimized two-circulating flue gas dust removal and desulfurization device, which comprises an absorbing liquid conveying unit, a flue gas purification unit and an absorbing liquid after-treatment unit, wherein the flue gas purification unit comprises a Venturi scrubber, a packed tower, a first-stage circulating pool, a first-stage absorbing liquid circulating pump, a second-stage circulating pool and a second-stage absorbing liquid circulating pump, and the first-stage circulating pool and the second-stage circulating pool are arranged below the desulfurization packed tower and are partitioned by an annular partition plate; and an air aerator is also arranged at the bottom of the first-stage circulating pool. In the device disclosed by the utility model, the Venturi scrubber can carry out the temperature reduction, dust removal and pre-desulfurization for high temperature flue gas, and the packed tower can carry out the efficient desulfurization for the pre-desulfurized flue gas. The device has high dust removal and desulphurization efficiency, smaller occupied area, low investment, and can be suitable for desulfurization processes of various flue gases and especially suitable for the treatment process of regenerated flue gas in a catalytic cracking unit.

Optimized two-circulating flue gas dust removal and desulfurization device

Method for desulfurizing high-concentration flue gas

The utility model relates to a gas-liquid cross-flow contact device, which comprises a tower body and a gas-liquid cross-flow contact area inside the tower body, wherein an inlet gas distributor is arranged at the lower part of the gas-liquid cross-flow contact area; a gas outlet is formed at the top of the tower body; a defogger is arranged at the lower part of the gas outlet; a liquid holding groove is formed at the bottom of the tower body; and absorption liquid nozzles are horizontally arranged on the gas-liquid cross-flow contact area and on the inner side of the tower body, and are uniformly arranged at the periphery of the inner side of the tower body; and one or a plurality of layers of absorption liquid nozzles are arranged at different heights. The device can be used for desulfurization and dust removal of flue gas, has the advantages of simple structure, economy, reasonableness, high efficiency, low probability of being blocked, capability of meeting environment-protection standard, and the like, can be extensively applied to the purification treatment of the gas containing SO2, and is particularly suitable for desulfurization treatment of regenerated flue gas for fluid catalytic cracking (FCC) of refineries.

Gas-liquid cross-flow contact device

The utility model relates to a high-efficiency flue gas dust-removal desulfurization device. The high-efficiency flue gas dust-removal desulfurization device comprises primary and secondary desulfurization units, primary and secondary absorption solution circulating pools and a demister, wherein the primary dust-removal desulfurization unit is a fair concurrent spray tower, and the lower part of the fair concurrent spray tower is provided with the primary absorption circulating pool; the secondary dust-removal desulfurization unit is the fair countercurrent spray tower, and the lower part of the countercurrent spray tower is provided with the secondary absorption solution circulating pool; and the primary absorption solution circulating pool and the secondary absorption solution circulating pool are in an integrated structure, and an overflow device is arranged between the primary absorption solution circulating pool and the secondary absorption solution circulating pool to ensure that the absorption solution of the secondary absorption solution circulating pool flows into the primary absorption solution circulating pool. Compared with the prior art, the high-efficiency flue gas dust-removal desulfurization device has the advantages of small occupied space, low investment, high desulfurization efficiency and the like.

Wenjun Dai

Papers

Optimized two-circulating flue gas dust removal and desulfurization device

Method for desulfurizing high-concentration flue gas

Gas-liquid cross-flow contact device

High-efficiency flue gas dust-removal desulfurization device

High-SO2 concentration pressure smoke desulfuration method and device