Cleaning device for flue gases produced during domestic wastes combustion

FIELD: machine building.

SUBSTANCE: device contains rotary adsorber connected with transit gas duct, the adsorbed is made out of cylindrical casing with lids, branch pipes for flue gases input and output, inside it rotor with radial cells is installed, it is filled with adsorbent - granulated blast-furnace slag. At that the rotary adsorber is connected with the transit gas duct via the heat exchanger with cone tray, it is cooled by cooling medium, the rotary adsorber lid is made in form of two half-cone lids with nozzles for flushing water spraying and output of cleaned flue gases, the bottom is made in form of two half-cone bottoms with nozzles for flushing water output and input of cooled flue gases, the radial cells of rotor are filled with two layers of adsorbents A1 and A2 with height H1 and H2, respectively, at that the top layer A1 includes pumice granules of metallurgic slags with basicity factor M > 1, diameter from 20 to 40 mm, and bottom layer A2 is chips of active anthracite with same diameter of particles.

EFFECT: increased economic and ecologic efficiency of cleaning of flue gases produced by domestic wastes combustion.

4 dwg

 

The invention relates to the protection of the environment and can be used for cleaning flue gases derived from the incineration of municipal waste.

A known system for heating the air leaving gases with simultaneous cleaning of the latter, comprising a rotary air preheater, consisting of boxes, equipped with nozzles of the input and output of flue gases and air, rotor, filled with nozzle (gasket), and the device for purification of flue gases from nitrogen oxides and sulfur, in the form of disc rotors, partially submerged in a bath of absorption solution and placed on a course of movement of the gas for the heater [ed.St. The USSR №1041808, Μl4F23L 15/02, 1983].

The main disadvantages of the system of air heating is the complexity and bulkiness of the equipment additional cleaning devices, the impossibility of utilization of unburned fuel residues and WITH that reduces the economic and environmental efficiency of the plant.

Closest to the proposed invention is an integrated rotary regenerative air heater (adsorber), including the box, equipped with nozzles of the input and output of flue gases and air, in which is placed a rotor with radial cells, each of which consists of located in the direction of motion of the flue gases adjacent to �warm side of the accumulation section, filled gasket made of heat-absorptive material (metal sheets, refractory bricks, Raschig rings, etc.) and adjacent to the cold side of the cleaning section consisting of a container with a perforated bottom, in which are placed the granules of pumice made from basic slag (adsorbent) with the module basicity M>1 in diameter from 20 to 40 mm, and the duct connected to the cold side of the gas compartment with the outlet nozzle of the flue gases through the expander, provided with a conical bottom and splash protector [RF patent №2494313, IPC F23L 15/02, 2013].

The main disadvantage of the known rotary regenerative air heater is the impossibility of cleaning the adsorbent of pollutants in flue gases generated from burning of household waste and deposited it in the process, resulting in the efficiency of purification of flue gases from harmful impurities decreases sharply.

The technical result for the solution of which the present invention is directed, is to increase economic and environmental efficiency of the device for cleaning flue gases derived from the incineration of municipal waste.

The technical result is achieved in that the device for cleaning flue gases derived from the incineration of municipal waste, contains connected in the course Dimova� gas transit gas duct heat exchanger with conical pan cooled refrigerant (water or outside air), and the rotary adsorber consisting of a cylindrical body, the cover of which is made in the form of two semiconic caps with nozzles spray rinse water and the release of treated flue gas, the bottom is made in the form of two semiconic bottoms from the nozzles of the wash water outlet and inlet of the cooled flue gases in the body of the rotary adsorber is placed a rotor with radial cells, each of which are filled with two layers of adsorbents A1 and A2 height H1 and H2 respectively, with the upper layer A1 represents granules of pumice slag with the module basicity M>1 diameter from 20 to 40 mm, and the lower layer A2 is a crumb of active charcoal with a similar diameter of the particles.

Device for cleaning flue gases derived from the burning of household waste is shown in Fig. 1-4, where Fig. 1 shows a diagram of the device of Fig. 2, 3. 4 - General view and cross sections of the rotary adsorber.

Device for cleaning flue gases generated from burning of household waste, includes United along the flue gas transit flue I, the exchanger II with conical pan, cooled by the refrigerant (water or outside air), and the rotary adsorber III (drive shown) consisting of a cylindrical body 1, the lid Kotor�th in the form of two semiconic covers 2 and 3 with the nozzles spray rinse water 4 and output the cleaned flue gases 5, respectively, the hull is made in the form of two semiconic bottoms 6 and 7 with the nozzles of the wash water outlet 8 and the inlet of the cooled flue gas 9 in the housing 1 of the rotary adsorber III placed the rotor 10 with radial cells 11, each of which are filled with two layers of adsorbents A1 and A2 height H1 and H2 respectively, with the upper layer A1 represents granules of pumice slag with the module basicity M>1 in diameter from 20 to 40 mm, and the lower layer A2 is a crumb of active charcoal with a similar diameter of the particles.

The proposed device operates as follows. The flue gases of boiler unit (Fig.1-4 not shown) from the drop flue I with a temperature of 120-150°To enter the heat exchanger II, which is cooled by the refrigerant with outdoor air or mains water) to a final temperature of 90 to 100°With, resulting in them condenses part of the water vapor and other components that form the condensate flowing down, and then cooled flue gases are fed into the rotary adsorber III. In the heat exchanger II refrigerant perceives the heat of the flue gases, resulting in this heat can be used for various purposes. The rotary adsorber III cooled flue gases from semiconic bottom 7 with the rotation of the rotor 10 are distributed to the cells 11, a layer of the H2 adsorbed�the A2 filled with crumbs of active charcoal, which is used for adsorption of CO, chlorine compounds and organic contaminants (polycyclic aromatic compounds, etc.), then proceed to layer N1 of the adsorbent A2, filled with granules of pumice 8 diameter from 20 to 40 mm, made of basic slag (diameter of granules and crumbs anthracite assigned condition for minimum aerodynamic resistance of the cells 11 and the range of sizes of pellets metallurgical pumice). Baby active anthracite is a fairly durable substance that consists of many different organic compounds that are sorbed WITH, chlorides and organic compounds present in flue gases from the conditions of affinity for him. At the same time, the active charcoal is safe from the sanitary point of view the substance that proved its use as a filtering media for water purification [RF patent №2177906, 2002]. Pellets metallurgical pumice represent a highly porous material with a mechanically stable structure (resistance to compression of up to 2.7 MPa), consisting of calcium oxide, silicon oxide, aluminum oxide and partly of magnesium oxide (CaO, SiO2Al2O3, MnO) c module basicity M>1 and high value of coefficient of heat capacity [Building mate�ialy. Guide. Edited by Boldyreva, A. S. and others - M.: Stroyed.,1989, p. 423; Domotel A. K. Construction materials. - M.: Higher. school, 1989, p. 163]. The high value of the modulus gives the basicity pellets metallurgical pumice basic properties, allowing to adsorb on the surface of a substance having acid properties, which include many impurities in flue gases generated from burning of household waste (acids, amines, ammonia, NOx, SOx, CO, chlorine compounds, etc.). In addition, based on their composition of metallurgical slag resistant to the corrosive effect of the acidic components of the flue gases, widely available and relatively cheap. Flue gases, moving from bottom to top through the slag granules, which are also able to accumulate heat at the same time cool with the further condensation of water vapor by condensation, penetrating into the pores of the granules of the adsorbent, in which due to the previous cycle remaining drops of acidic condensate. Adsorbed components (e.g., oxides of nitrogen and sulfur, chlorides) in the pores of the granules have high reactivity, due to their interaction with the surface of the adsorbent granules of slag pumice [Nenitzescu K. General chemistry - M.: Mir, 1968, p. 298], therefore, are oxidized with oxygen at a rate greater than in the gas phase, with the formation of lay�rastvorimykh in water NO 2and SO3that, in turn, interact with drops of water to form the corresponding acid HNO3, H2SO4and Cl that accumulate in the pores of the adsorbent is granulated slag, after which the cleaned and cooled flue gases with a temperature of 50-60°With using semiconic the cover 3 and the nozzle 5 is directed into the chimney (Fig. 1-4 not shown) and then discharged into the atmosphere. At the same time the cell 11 with saturated adsorbents A1 and A2 as a result of rotation of the rotor 10 is received in the compartment semiconic cover 2, where the nozzle 4 of the cell 11 is sprayed with the rinsing water, which absorbs the water-soluble components (acids, amines, ammonia, etc.) present in it. A saturated wash water and condensate from the heat exchanger II is removed for further processing.

The heights H1 and H2 of the adsorbents A1 and A2, the flow rate of washing water (regeneration of adsorbents) is determined empirically.

Thus, the use of adsorption process for purification of flue gases generated from burning of household waste, which contain extremely diverse and dangerous range of contaminants, cheap and available adsorbents - aggregate active charcoal and granulated blast furnace slag in a rotary adsorber and removing these impurities from the adsorbent by washing with water allows Powys�th economic and environmental efficiency of the proposed device.

Device for cleaning flue gases derived from the incineration of municipal waste containing connected with transit flue rotary adsorber consisting of a cylindrical body with end caps, nozzles inlet and outlet flue gases, which is placed inside the rotor with a radial cells, filled with adsorbent is granulated blast furnace slag, characterized in that the rotary adsorber is connected to a transit duct through the heat exchanger with conical pan, cooled by the refrigerant (water or outside air), the cover of the rotary adsorber in the form of two semiconic caps with nozzles spray rinse water and the release of treated flue gas, the hull is made in the form of two semiconic bottoms from the nozzles of the wash water outlet and inlet of the cooled flue gases, the radial cell of the rotor are filled with two layers of adsorbents A1 and A2 height H1 and H2 respectively, with the upper layer A1 represents granules of pumice slag with the module basicity M>1 in diameter from 20 to 40 mm, and the lower layer A2 is a crumb of active charcoal with the same particle diameter.



 

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