This is a non-regenerative wet alkali cleaning technology for waste gas which can remove SOx and particulate matters from waste gas. The technology uses an alkaline solution as the absorbent and purifies waste gas in a modular manner. The technology now has been put into use for 75 domestic projects, including 70 for the catalytic cracking units of refining and chemical enterprises, 3 for treating waste gases from circulating fluidized bed boilers in the power station and 2 for treating MTO unit waste gases.
（1） It uses a specific type of nozzle, from which large-size liquid drops are sprayed out with a certain penetrating power, and are in full contact with waste gas, and may remove sulfur efficiently; the drops will not be carried away with waste gas, reducing the possibility of waste gas trailing.
（2）No acid mist will be produced, and the scrubber will not be corroded and blocked;
（3） In terms of safety and reliability, even in case of any fault of upstream plants, it can ensure stable operation of the system such as in the working conditions of high temperature and catalyst loss;
（4）It is characterized by simple structure, small pressure drop, high dust removal efficiency and low energy consumption, and the equipment wall is not easy to scale, allowing long-cycle operation;
（5）It covers a small floor area, and is low-cost and easy to implement.
This is a wet scrubbing technology, which is highly inclusive and can remove acid gases like SO2, SO3 and HCl, particulate matters, mercury, etc. The absorption liquid for acid gas treatment is NaOH solution, etc.; through slight adjustment, hydrogen sulfide can be removed, or SO2 can be oxidized to make acid.
1. It has such advantages as large circulation amount of scrubbing solution, high absorption efficiency, and over 99.9% desulfurization efficiency. The content of SO2 in the waste gas vented is low and even can satisfy the “zero” emission requirement;
2.It uses a specific type of large-diameter nozzle, which makes it not easy to cause block and ensures long-term operation;
3.The scrubbing tower-circulation tank integrated design feature is quite simple and easy to repair. While waste gas is treated, the drain may reach the COD standard, and the amount of wastewater is very low, being within 1m3/hour in general;
4.The operation flexibility is high, and the waste gas emission standard can be met within the range of 30-130%;
5.Environmental emission requirements can be satisfied in the working condition of startup and shutdown of upstream plants or other special working conditions. For the treatment of tail gas from any sulfur recovery unit, the emission standard may be met when the SO2 concentration reaches 20000-30000mg/Nm3.
The H2O2 desulfurization technology takes H2O2 (hydrogen peroxide) as absorbent to react with SO2. The final product of such reaction is sulfuric acid. This technology is primarily applied in the acid production industry, and often used in downstream of acid-making plant.
The SO2 emission concentration can be less than 50 mg/Nm3 or lower as required.
1.For the established acid tail gas desulfurization device that does not meet the SO2 emission standard, it can be upgraded and satisfy the standard at one time and ensure the acid mist content is no more than 5mg/m3;
2. No waste water is produced, and the byproduct dilute sulfuric acid can be for private use or sold.
This is a renewable tail gas/waste gas SO2 recovery technology that uses absorbent to absorb and recycle SO2 in the waste gas.
The absorbent used is a proprietary organic solvent that could absorb SO2 in the waste gas, and the SO2 absorbed is recovered after being heated and resolved, and the solvent is regenerated. The concentration of SO2 recovered by this technology can reach over 99.5% (dry basis), and can fully satisfy the raw material requirements of Claus sulfur-making plants and acid-making plants.
The MSorb process plant mainly includes such production units as pre-scrubbing system, absorption system and solvent regeneration system.
（1）The SO2 emission index satisfies and is even beyond the national standard, and no acid mist is generated;
（2） It does not affect the normal operation of upstream plants, and can solve the up-to-standard emission problem when the upstream plants are started and stopped;
（3）It can completely substitute the traditional tail gas treatment unit (such as SCOT unit, tail gas alkaline washing unit, etc.) of Claus sulfur-making device due to the high SO2 recovery rate, short process, low energy consumption, non-use of catalyst, and low investment and operation costs;
（4） It can treat a variety of sulfur-containing pollutants in the waste gas, such as H2S, RSH, COS, CS2, etc.;
（5）No incinerator is required, and no fuel gas is consumed;
（6） It causes extremely low secondary pollution, and the byproduct SO2 gas generated may be used as the raw material of sulfur or sulfuric acid plants, which has economic value.
The M·SulfurP wet desulfurization / waste acid recovery technology converts the sulfides in sulfur-containing waste gases into commercial-grade concentrated sulfuric acid of about 98% concentration for recycling, effectively preventing environmental pollution and improving the plant efficiency.
It imposes no limitation on the composition of acid gases, and the concentration of the treated hydrogen sulfide can be from less than 1% to more than 90%. The raw material may contain CO2 of high concentration and impurities such as hydrocarbon organics, and also accept the process gases which contain high moisture.
1) It may convert the liquids and gases containing sulfur compounds into commercial-grade concentrated sulfuric acid (usually 98%);
2) The sulfur recovery rate exceeds 99%, and the concentration of SO2 in the waste gas reaches the national emission standard;
3) The process gas does not need to be dehydrated;
4) No chemicals or other additives are consumed;
5) No waste liquids or slags are generated, and NH3 and hydrocarbons are allowed to exist in the raw materials;
6) The consumption of cooling water is low;
7) The heat recovery is for high-pressure superheated steam of 5.0~6.0MPag;
8) The operation flexibility is very wide;
9) Simple process, less equipment, small floor area, low investment, and cost-efficient operation;
10) Extremely high energy efficiency, high product value and low energy consumption.
The SemiD desulfurization-dedusting integrated technology uses the alkaline substances such as quicklime, slaked lime or baking soda as reactants to absorb sulfur dioxide and other acid gases (i.e. SO2, HCl, HF and SO3) in the waste gas, and remove high-concentration dusts, dioxins and heavy metals.
1) Over 98% SO2 can be removed;
2) After treatment, there is less than 1 ppm SO3 and less than 5 mg/Nm3 dust in the outlet waste gas;
3) No slurry circulation is required, and both absorbent and dust are in the fluidized state, thus avoiding the blockage incurred in the process of slurry preparation, storage, treatment and spraying, and avoiding the corrosion of dry-wet zone and the scaling of pipelines and fittings;
4) The equipment is compact and covers a small floor area, and the investment is low;
5) Instead of salt containing waste liquid, solid wastes are directly generated;
6) White smoke and other colored smoke plumes will not be produced, and no inorganic salts will fall around the plant.
Solid alkali is injected into the high-temperature waste gas in front of the scrubbing tower, and SO3 in the waste gas reacts with the solid alkali to form sulfates for greatly reducing the SO3 concentration. These sulfates and unreacted reagents will be further removed in the spray scrubber.
1)The SO3 removal rate is high;
2) This is a simple and low-cost process and easy to install and modify;
3) After testing, flow field simulation and debugging, the system can automatically optimize the utilization rate and injection position of the desulfurizer.
The M·SCR technology uses NH3 as reducing agent, which will reduce NOx to N2 and H2O under the action of catalyst.
（1）As catalyst is used, the reaction temperature is low, at a minimum, about 160°C;
（2）Over 95% nitrate can be removed;
（3）The compact process equipment may operate reliably for a long period;
（4）Reduced nitrogen is vented without secondary pollution;
（5） The operating flexibility range is large, and the high-than-expected denitration standards can be met.
The M·SNCR technology uses ammonia to reduce NOx under high temperature without any catalyst.
The basic principle of the technology is to inject the reducing agent (such as ammonia and urea) containing NHx base into the 800~1100°C zone in furnace, which is rapidly thermally decomposed into NH3 to react with NOx in waste gas without the action of the catalyst..
（1）The M·SCR technology can achieve the denitration efficiency of 30%~60%; when being used in CFB boiler, it may achieve the denitration efficiency of over 70%;
（2）Compared with SCR denitration plant, the modification work quantity for existing plant is less;
（3）It applies when the plant does not have the conditions for boiler modification, and the reaction temperature range is 800°C-1100°C, and the denitration efficiency requirement is low;
（4）The combination of M·SCR and M·SCR technologies can also be provided for denitration. The advantage of this technology is to reduce the investment in catalysts for the M·SCR technology while ensuring the denitration efficiency.
This technology injects ozone into the inlet section of the wet scrubbing tower. The injected ozone gas (O3) oxidizes insoluble NOx in the waste gas to form N2O5. Through wet spraying, N2O5 is then dissolved in water to form nitric acid (HNO3), which reacts with alkali to produce nitrate.
This technology neither increases the system pressure drop, nor requires the modification to the waste heat boiler. It has been put into operation for nearly 20 domestic catalytic unit of waste gas purification projects.
（1）A proprietary ozone nozzle is used to achieve high-efficiency ozone uniformity;
（2）Using a proprietary nozzle, it can quickly absorb the produced N2O5 and improve the denitration efficiency.
M·ESNCR is an enhanced M·SNCR denitration technology which uses NH3 as the reducing agent and H2 and CO as the reducing aids. That is, through addition of a certain concentration of hydrogen in the conventional M·SNCR process, the M·SNCR reaction temperature window shifts to low temperature, being from 850-1050°C to 760-840°C, or denitration over a wider temperature range is achieved through adjustment of the component of reducing agent, thus widening the temperature window and making the denitration effect more stable.
（1）One-time investment and low operating costs. Since no catalyst is used in the denitration process, there is no additional system pressure loss and other disadvantages caused by other waste gas denitration technologies;
（2）The entire reduction process is carried out inside the boiler, and no reactor is separately required;
（3） The participation of hydrogen increases the intermediate (active element) of the reaction between the reducing agent and NOx, reduces the activation energy of the reaction, and ensures that the reaction can be carried out under low temperature.
This technology is used to remove the white smoke discharged in the process of wet desulphurization in power plants, coal chemical or refining and chemical industries, or metallurgical quenching and casting of steel mills. White smoke contains inorganic salts with sulfur dioxide, sulfur trioxide, etc., which will result in visual pollution and damage the surrounding living and production environment.
(1) Provide different process packages for flue gas discharged from different equipment;
(2) Different treatment methods are adopted, such as condensation(reduce saturation temperature),defogging(remove free liquid drops) and increasing temperature (increase unsaturation degree);
（3）Elaborate design,advanced simulation about fluency, and optimized equipment;
（4）SO3 acid mist (blue flue gas) and dust can be removed at the same time.
The proprietary RTO\RCO combustion method-based VOCs treatment technology can efficiently burn the VOCs of moderate or low concentration (<1000 mg/m3) to oxidize or degrade VOCs, especially for non-methane hydrocarbons.
（1）Special internal air flow distribution system is used to ensure the efficiency of VOCs treatment.
（2）Proprietary lift valve design: precise mechanical design and processing is used to ensure the valve sealability. Unique bearing linkage design allows the lift valve to open and close for millions of times, with the service life up to ten years.
（3）It allows one-click startup and unattended operation, and provides remote online operation control and maintenance services via the Internet.
（4）It can provide conventional design for filling honeycomb ceramic regenerators, and economical and practical drawer design for filling regenerators such as Raschig rings and Pall rings.
（5）Specialized ordering: three-bed and two-bed RTO\RCO designs are available, and special design with switching air chamber between the two can also be provided, so as to ensure the efficiency of dragging, and reduce the investment and land occupation.
（6）Skid-mounted design may reduce land occupation.
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