RU2177976C1 - Unit for reduction of toxic emissions in drawing coke out of coke ovens - Google Patents

Abstract

FIELD: chemical recovery coke industry; coke oven unloading devices; reduction of coke emission at discharge of coke into coke carrying cars. SUBSTANCE: proposed unit includes dust removal system with canopy, draft activators, dust collectors, air ducts and horizontal partitions. Located in upper portion of canopy is straight-flow cyclone with air duct feeding purified air to supply slotted air ducts located over perimeter of horizontal partition. EFFECT: enhanced stability of process at small sizes of canopy; reduced emissions of dust into atmosphere. 2 dwg

Description

 The present invention relates to the coke industry, and more particularly to the discharge devices of coke ovens, and can be used to reduce dust emissions in the atmosphere when unloading coke in a coke oven carriage.

 Devices for dust-free coke delivery are known. Part of them is an exhaust umbrella located above the coke-carriage / 1-4 /. These designs have a common drawback - the need for large capacities and dimensions of the suction and dust removal systems due to the formation of a large volume of dust-gas mixture in the process of coke unloading due to enhanced heat exchange between the air and the falling material inside the shelter.

 Another part of the known solutions in this field is represented by dust removal systems with irrigation with water, air-gas mixture / 5-7 /. The use of water limits the scope of these devices in harsh climatic conditions.

 In all the aforementioned similar devices, the organization of dust removal is carried out only by stationary exhaust systems.

 Known solutions aimed at changing the design of coke oven cars, which solves the problem of dust-free coke delivery only partially / 8-11 /. A device for reducing emissions of harmful substances when issuing coke from horizontal coke ovens / 12 /, containing an umbrella made in the form of a diffuser, and an outer casing, forming a slit hole along the perimeter of the junction of the casing to the walls of the car, a dust and gas collection system, including dry cyclones and connected to internal cavity of the shelter and slotted hole. The umbrella is equipped with horizontal partitions located at its end and overlapping the upper part of the loaded sections of the coke carriage. The whole device is installed on a door-lifting machine.

 The described device is the closest to the claimed one according to the totality of features and we have taken as a prototype.

 The disadvantage of the prototype is the instability of the process of removing air through slit openings around the perimeter of the coke wagon due to the short zone of stable suction, resulting in a sharp decrease in the efficiency of the device even with low wind loads. The disadvantages of the known device can also be attributed to the large dimensions of the umbrella, which entails a large consumption of metal for the manufacture and repair of the structure, as well as significant emissions of dust into the atmosphere due to the low efficiency of single-stage air purification in dry cyclones before discharge into the atmosphere.

 The objective of the invention is to increase the stability of the process of removing dusty air from the sides of the car and from the umbrella as a whole, reducing the dimensions of the umbrella and reducing dust emissions into the atmosphere.

 To solve the problem in a device for reducing emissions of coke from the coke oven, containing a supply and exhaust dust removal system installed on a door car with the ability to move along the coke side of the coke oven car, including an umbrella, traction drives, dust collectors, air ducts and horizontal partitions, according to the invention, in the upper part of the umbrella there is a direct-flow cyclone with an air duct supplying purified air to the supply slotted air ducts located at calorimeter horizontal partition.

 Dusty air is removed for cleaning only from the inside of the umbrella, which consists of a coke guide and horizontal partitions, and dusty air is removed from the sides of the car with flat supply jets directed to the center of the horizontal partition and transporting dusty air to the inside of the structure. In this case, flat supply jets are created due to the partial (about half) return of the air removed from the inner part of the umbrella after its preliminary cleaning in direct-flow cyclones in order to protect the traction stimulator from abrasive wear, and the reduction of atmospheric emissions is achieved due to the combustion of the remaining small fractions of coke dust supplied by supply jets to the high temperature zone.

 The analysis of the prior art did not allow to identify an analogue characterized by features identical to all the essential features of the claimed solution, i.e., it, the claimed solution, meets the requirement of novelty.

 No signs have also been identified that are distinctive in the claimed solution, i.e., it meets the requirement of an inventive step.

 The invention is illustrated by drawings, where in FIG. 1 shows a general view of the device, and in FIG. 2 is a section AA in FIG. 1.

 A device for reducing emissions of harmful substances during the production of coke from coke ovens contains smoke exhausters 1 and 2, once-through cyclones 3, cyclone 4, fresh air inlet ducts 5, horizontal partitions 6, overlapping the upper part of the loaded sections of the coke wagon. Coke is unloaded through the coke guide 7, which is part of the umbrella, into the coke carriage 8 with vertical partitions 9 installed in it.

 The device operates as follows. When the coke is unloaded into the coke-carriage 8 through the coke guide 7, the dust-gas mixture enters the direct-flow cyclones 3, after which the contaminated air with a high concentration of dust is sent to the cyclone 4 for cleaning and is exhausted into the atmosphere. Air with a low concentration of dust from the central part of the cyclone 3 is supplied to the supply slit air ducts 5. The horizontal partitions 6 allow you to organize a directed flow of supply air in such a way as to prevent dust from blowing out of the coke carriage 8. Small fractions of coke dust contained in the supply jets burn in the high temperature zone inside the coke guide. The compactness and small dimensions of the installation make it possible to place it on a door car.

 The use of the inventive device minimizes the amount of dust emitted into the atmosphere due to the organized air circulation inside the installation and the combustion of fine dust fractions in the high temperature zone.

Literature
1. Auth. St. 535839, MKI С10В33 / 00, Device for removing gases when unloading coke from coke ovens. /A. I. Nikitin, A. M. Dotsenko, A. T. Pozhidaev, V. I. Anichin and others (USSR) - 4440932 / 23-26. Claimed on 04.25.88. Publ. 01/15/90. Bull. 2.

 2. Auth. St. 1161533 USSR, MKI S10V33 / 00. A device for the removal of gases when unloading coke from coke ovens. /FROM. V. Stepko (USSR) - 3450221 / 23-26. Declared 06/08/82. Publ. 06/15/85. Bull. 22.

 3.Application 2491943 France, MKI C10B33 / 06. Declared 04.16.82.

 4. 3 application 2938893 Germany, MKI S10V33 / 06. Declared 09/26/79. Publ. 04/02/81.

 5. Patent 1771506 Germany, MKI C10V33 / 14. Claimed on 05/31/68. Publ. 07/25/74.

 6. Application 3033519 Germany, MKI C 10 V 33/00. Stated 11.10.80. Publ. 06/19/82.

 7. Gemmil R. I., Williamson F., Hall W. L., Roberts T. L. The Institute of Material: 2-nd International Cokemaking Congress - London, 1992. Coke and Chemistry 5, M.: Metallurgy, 1993.

 8. US patent 4196054, MKI C10B39 / 14. Declared 10/31/77. Publ. 04/01/80.

 9. U.S. Patent 4213489, MKI C10B39 / 14. Declared 10.01.79. Publ. 07/22/80.

 10. U.S. Patent 3852159, MKI C10B39 / 14. Declared July 24, 73. Publ. 12/03/74.

 11. Auth. St. 1043059 USSR, MKI V61R3 / 04. Coke quenching car. /IN. G. Kucher, G.R. Reiman et al. (USSR). Declared 10.08.82. Publ. 09/23/83. Bull. 35.

12. Patent 2088629 of the Russian Federation, MKI ⁶ C10B33 / 00. Declared January 5, 1995. Publ. 08/27/95. Bull. 24. (prototype).

Claims (1)

 A device for reducing emissions of coke from coke ovens containing coke ovens mounted on a door-mounted car with the possibility of moving a dust removal system along the coke side of the coke carriage, including an umbrella, traction drives, dust collectors, air ducts and horizontal partitions, characterized in that in the upper part of the umbrella there is a direct-flow cyclone with an air duct supplying purified air to the supply slotted air ducts located along the perimeter of the horizontal partition.

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