A flue gas-treating method for treating acid tail gas by using an ammonia process, comprising the following steps of: 1) controlling the concentration of sulfur dioxide in an acid tail gas entering an absorber to be ≦30,000 mg/Nm3; 2) spraying and cooling with a process water or/and an ammonium sulfate solution in the inlet duct of the absorber or inside the absorber; 3) providing an oxidation section in the absorber, wherein the oxidation section is provided with oxidation distributors for oxidizing the desulfurization absorption solution; 4) providing an absorption section in the absorber wherein the absorption section achieves desulfurization spray absorption by using absorption solution distributors via an absorption solution containing ammonia; the absorption solution containing ammonia is supplied by an ammonia storage tank; 5) providing a water washing layer above the absorption section in the absorber, wherein the water washing layer washes the absorption solution in the tail gas to reduce the slip of the absorption solution; 6) providing a demister above the water washing layer inside the absorber to control the concentration of mist droplets contained in the cleaned tail gas. In the coal chemical industry, the integration of the Claus sulfur recovery process and the ammonia desulfurization technology can reduce the investment of the post-treatment and simplify the operation process, and provide intensive advantages to the environmental control of plants.

Flue gas-treating method and apparatus for treating acidic tail gas by using ammonia process

The invention belongs to the field of sulfur recovery, and particularly relates to an SWSR-8 pressurization sulfur recovery process. The process comprises the steps that acid gas enters a sulfur making furnace, H2S is subjected to a high-temperature Claus reaction and converted into sulfur, and sulfur enters a two-stage converter to conduct two stage catalytic conversion for recovering sulfur; sulfur making tail gas enters a hydrogenation reactor, under the action of a hydrogenation catalyst, SO2 and COS are reduced to H2S through hydrogenation hydrolysis, reduced H2S gas is absorbed with an MDEA solution, and after purified tail gas recovers heat through incineration, flue gas is exhausted to the atmosphere through a chimney, wherein the pressure of acid gas entering the sulfur making furnace ranges from 90 kPa(g) to 120 kPa(g), and the pressure of the sulfur making furnace ranges from 90m kPa(g) to 120 kPa(g). The pressure of cooling and heat exchange equipment such as a sulfur making waste heat furnace, a first stage sulfur condenser, a second stage sulfur condenser, a third stage sulfur condenser, a steam generator and a tail gas waste heat boiler is higher than that in the prior art, the total heat transfer coefficient is increased, the occupied area is decreased, catalytic and absorption reactions can be conducted conveniently, the sulfur recovery rate is increased, and SO2 discharge is reduced.

SWSR-8 pressurization sulfur recovery process

Apparatus and methods for desulfurization of a sulfur-oxide containing gas by treatment with ammonia containing liquids. The apparatus and methods may utilize two distinct circuits of two different ammonia containing liquids which are applied in two distinct chambers. The gas may be cooled prior to entry into the circuits. There may be fluid communication between the two circulation circuits.

Ammonia-based desufurization process and apparatus

Apparatus and methods for denitrification and desulfurization of and dust removal from an FCC tail gas by an ammonia-based process. The apparatus may include a first-stage waste heat recovery system, a denitrification system, a dust removal and desulfurization system, a tail gas exhaust system, and an ammonium sulfate post-processing system. The dust removal and desulfurization system may include a dedusting tower and an absorption tower disposed separately. The top and the bottom of the absorption tower may be connected respectively to the tail gas exhaust system and the ammonium sulfate post-processing system. The absorption tower may include sequentially, from bottom to top, an oxidation section, an absorption section, and a fine particulate control section. The methods may be implemented with the apparatus.

Dust removal and desulfurization of FCC exhaust gas

The invention provides a high-efficiency and energy-saving sulphur recovery device and a high-efficiency energy-saving sulphur recovery method. The sulphur recovery device provided by the invention comprises a thermal reaction system, a Claus reaction system and an exhaust gas incineration and flue gas heat recovery system; a process method of the sulphur recovery device mainly comprises the following steps: performing a thermal reaction and a Claus reaction on an acidic raw gas to produce sulphur and sulphur production exhaust gas, and producing medium-pressure steam as a by-product; feedingthe sulphur production exhaust gas into an exhaust gas incineration furnace for incinerating; recovering heat energy from high-temperature flue gas which is produced by the exhaust gas incineration furnace through a flue gas convection chamber, namely, arranging a five-section heat exchange area, including an overheating section, a boiler water supply preheating section, an exhaust gas preheatingsection, a raw gas preheating section and a sulphur production air preheating section, in the flue gas convection chamber. By using the sulphur recovery device and the sulphur recovery method providedby the invention, the waste heat of the flue gas at the outlet of the exhaust gas incineration furnace can be fully utilized; the acidic raw gas, the sulphur production exhaust gas, and sulphur production air can be preheated to a high temperature; the temperature of a sulphur production combustion furnace can be increased; the conversion rate of the sulphur in the furnace is favourably improved;the consumption amount of fuel gas required by the incineration furnace can be reduced.

High-efficiency and energy-saving sulphur recovery device and method

The utility model provides a novel hydrogen-sulfide-containing waste gas treatment system. The system comprises a Claus furnace, first-stage, second-stage and third-stage steam generators, first-stage, second-stage and third-stage coolers, first-stage, second-stage and third-stage sulfur recoverers, a Claus converter, desulfurization equipment and a hydrogenation reactor, wherein a pyrolytic reaction tube is arranged in a furnace chamber of the Claus furnace, an acid gas feeding pipeline is connected with the Claus furnace and the pyrolytic reaction tube respectively, the Claus furnace is connected with the second-stage sulfur recoverer through the first-stage steam generator, the first-stage cooler, the first-stage sulfur recoverer, the Claus converter, the second-stage steam generator and the second-stage cooler, and the second-stage sulfur recoverer is connected with the hydrogenation reactor; the pyrolytic reaction tube is connected with the desulfurization equipment through the third-stage steam generator, the third-stage cooler and the third-stage sulfur recoverer, and a top outlet of the desulfurization equipment is connected with a pipeline between the second-stage sulfur recoverer and the hydrogenation reactor. According to the system, the pyrolytic reaction tube is arranged in the Claus furnace, acid gas can be treated in the absence of a hydrogen source, and a heating furnace, that is, an external heat source, can be omitted.

Novel hydrogen-sulfide-containing waste gas treatment system

The utility model provides an acid gas treating system. The system comprises a Claus furnace, first-stage, second-stage and third-stage steam generators, first-stage, second-stage and third-stage coolers, first-stage, second-stage and third-stage sulfur recoverers, a Claus converter, desulfurization equipment and a hydrogenation reactor, wherein a pyrolytic reaction tube is arranged in a furnace chamber of the Claus furnace, an acid gas feeding pipeline is connected with the Claus furnace and the pyrolytic reaction tube respectively, the Claus furnace is connected with the second-stage sulfur recoverer through the first-stage steam generator, the first-stage cooler, the first-stage sulfur recoverer, the Claus converter, the second-stage steam generator and the second-stage cooler, and the second-stage sulfur recoverer is connected with the hydrogenation reactor; the pyrolytic reaction tube is connected with the desulfurization equipment through the third-stage steam generator, the third-stage cooler and the third-stage sulfur recoverer, and a top outlet of the desulfurization equipment is connected with a pipeline between the second-stage sulfur recoverer and the hydrogenation reactor. According to the system, the pyrolytic reaction tube is arranged in the Claus furnace, acid gas can be treated in the absence of a hydrogen source, and a heating furnace, that is, an external heat source, can be omitted.

Acid gas treating system

The utility model provides a xylene production system. The system comprises a xylene tower, an adsorption-separation tower, an extract tower, a raffinate tower, a finished product tower, an isomerization reactor, a heating furnace and a heptane-removal tower. A material discharged from an isomerization reaction feedstock-discharged material heat exchanger of a xylene device firstly enters a heat high-pressure separating tank, a gas phase separated from the heat high-pressure separating tank is cooled by virtue of an air cooler and a water cooler and then enters a cold high-pressure separating tank to carry out gas-liquid separation, a part of the separated gas phase is discharged to outside and the other part of the separated gas phase is used as recycle hydrogen for recycling; liquid phases separated from the heat high-pressure separating tank and the cold high-pressure separating tank are mixed, exchange heat with the isomerization reaction feedstock and then with an adsorption-separation feedstock and finally with the discharged material from the top of the heptane-removal tower and enter the heptane-removal tower; the adsorption-separation feedstock is firstly used as a heat source for the finished product tower reboiler, exchanges heat with the feedstock of the heptane-removal tower and then enters the adsorption-separation unit. By the xylene production system, the cancellation of an external high-grade heat source consumed by the finished product tower is achieved.

Xylene production system

A column gas liquid exchange system is disclosed. The system comprises rotational flow blade type gas rising holes, spraying shields, downcomer plates, collecting plates, separators and separating plates. Column plates are provided with the rotational flow blade type gas rising holes. Positions corresponding to the gas rising holes are fixed to the spraying shields through supports. A gap is provided between the bottom of each spraying shield and the corresponding column plate, thus forming a path allowing liquids on the column plates to enter the spraying shields. Side walls of the spraying shields are provided with spraying holes. The tops of the spraying shields are provided with the gas liquid separating plates. The gas liquid separators are mounted in the spraying shields. The downcomer plates and a column body form downcomer tubes. Each of the collecting plates is fixed to the back of the corresponding downcomer plate outside the corresponding downcomer tube. Two ends of each collecting plate tangent lines of which are perpendicular to the corresponding downcomer plate are fixed to the column wall, and the other end is decurved and extends into the downcomer tube of the lower column plate. The system enhances gas liquid contact, increases the gas liquid transfer efficiency, and is low in energy consumption, simple in structure and convenient to install and maintain.

A column gas liquid exchange system

The invention provides a method for producing furfural from biomass serving as a raw material. The method comprises the steps: hydrolyzing the biomass and water, so as to obtain a mixed solution of pentose, acetic acid and formic acid; introducing the mixed solution and an extractant into a static mixer for reaction, enabling a reaction effluent to be subjected to cooling, standing and layering, so as to obtain a water phase and an extracted phase, and enabling the extracted phase to enter an extractant regeneration tower for separation, so as to obtain a mixture, containing a trace volume of water, of furfural, acetic acid and formic acid from the tower top and obtain a regenerated extractant from the tower bottom; enabling the tower top product to enter a furfural refining tower for separation, so as to obtain acetic acid and formic acid, containing a trace volume of water, from the tower top and obtain furfural from a tower reactor; enabling the tower top product to enter an azeotropic rectifying tower, so as to extract the water phase from the tower top and obtain acetic acid and formic acid from a tower reactor; enabling the tower reactor product to enter a finishing column for separation, thereby obtaining formic acid and acetic acid. According to the method provided by the invention, the static mixer is adopted as a reaction vessel, and furfural is enabled to instantly achieve a balance in two phases, namely the extractant and the water, so that the yield of furfural is increased; the process flow is simple, meanwhile, furfural, acetic acid and formic acid are recovered, and no waste liquid is discharged, so that the method is an environment-friendly process.

Bo Dechen

Papers

Novel hydrogen-sulfide-containing waste gas treatment system

Acid gas treating system

Xylene production system

A column gas liquid exchange system

Method for producing furfural from biomass