FR2489481A1 - PULVERIZED CHARCOAL BURNER - Google Patents

Abstract

A. PULVERIZED COAL BURNER. B. BURNER CHARACTERIZED IN THAT THE ELEMENTS INTENDED FOR THE SUPPLY OF THE PULVERIZED COAL ARE COILS 7 AT ONE OR MORE EVEN ARRANGED BETWEEN THE CENTRAL PIPE 5 AND THE ENVELOPE 1, THE ENDS OF THE COILS 7 TANGENTIALLY OUTLET THROUGH THE WALL INTERMEDIATE 10, TO ENSURE THE MEETING OF DIFFERENT CURRENTS OF PULVERIZED COAL IN A SINGLE CURRENT, IN A TURBULENCE CHAMBER 9, FORMED BY THE PULVERIZED COAL NOZZLE 4 LOCATED AT THE END OF ENCLOSURE 1, NOZZLE 6 OF THE TUBE 5 AND THE INTERMEDIATE WALL 10. C. BURNER APPLICABLE IN PARTICULAR TO THE GASING OF COAL SPRAYED UNDER PRESSURE.

Description

The invention relates to a pulverized coal brine, capable of

  to be used for the gasification of pulverized coal under pressure, as well as in the chemical industry, in gas generators, for pressurized gasification, steam and oxygen, pulverized coal. Pulverized coal burners possessing a cylindrical envelope and coaxial channels for the supply of the oxidizing product and pulverized coal are already known, the last channel being subdivided by partitioning.

  intermediate, in parallel slots connected to the tubulars

  fuel supply lines, designed as worm gear vortex devices (USSR Certificate No. 211 002

Class D I / 02, 1966).

  The burners of the current state of the art have however a major disadvantage: during their operation with a current of pulverized coal which corresponds to a concentration of pulverized coal of about 500 kg for one cubic meter of real gas to be transported, it risks there is clogging of the helicoidal tubing, caused by the pulverized coal, as a result of the large variation in the cross section of the tubing along the latter (at the point of connection between the tubings

  and slits for supplying pulverized coal).

  This results in a sharp decrease in the operating reliability of the

burner.

  With regard to the technical characteristics, the system of the prior art closest to the burner according to the invention relates to a pulverized coal burner having a cylindrical envelope and an outlet nozzle, with, mounted on its axis a pipe having a nozzle at its lower end for supplying the oxidant, and with channels between the casing

  and the pipe of the helical elements being installed in the

  these channels (for example, intermediate partitions

  intended for the supply of pulverized coal), the angle of inclination

  its helical elements being equal to the installation angle of the feed pipe of the edible, and the section being equal to the section of the pipe intended for the supply of pulverized coal (application no. 26944202 / 24-06, figure 2, Class G 23 I / 02

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  The burners of the current state of the art have the following disadvantages: 1. Complex execution of the tubing, whose shape is continuously changing from a circle to a rectangle, and complex execution of the connection between the tubing and the channel 2. After the pulverized coal has emerged from the helical channels, the different currents of pulverized coal, the number of which depends on the number of supply channels, are contiguous, thus leading to a reciprocal action of these currents of pulverized coal and the stream of the oxidizing product from inside the reactor, as well as the possibility of a reciprocal action of the oxidant and hot gasification products, which results in overheating of the

lower part of the burner.

  The object of the invention is to create a simple, pulverized coal burner operating reliably under the conditions of gasification of the

pulverized coal under pressure.

  To this end, the invention relates to a pulverized coal burner which ensures a safe operation even during the gasification of pulverized coal under pressure, while being able to be manufactured in a technically simple manner. The pulverized coal burner according to the invention consists of a casing firmly connected to a flange, which tapers conically at one of its ends.

  to form an outlet nozzle of the pulverized coal. At the in-

  Inside the casing is a central pipe for supplying the oxidant, at the end of which is mounted a nozzle. Between the casing and the central pipe are the feed elements of the pulverized coal which are constituted as coils, easy to manufacture, and may have one or more turns. According to the invention, it is possible

  one or more coils for feeding the pulverized coal.

  The coils protrude, at the rear end, from the burner cover, and are then constituted in the form of tubings

  for the connection of the supply line of the -

  combustible. At the foot of the nozzles of the casing and the central pipe is an intermediate wall, crossed by the coils

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  which open tangentially into the turbulence chamber formed by the two nozzles and the intermediate wall. It is in this turbulence chamber that the different currents of pulverized coal are mixed to give a single current, undergoing a rotational movement, and which leaves the turbulence chamber in a continuous and concentric manner, at the same time.

  the carrier gas, which forms a curtain between the atmosphere and the

  reactor and the burner flame. The result is a flame characterized by great uniformity and great

stability.

The invention will be better understood in

  the description below and the attached drawing, of which

  the single figure shows an embodiment of the invention. The burner consists of a cylindrical casing 1 provided with a flange 2 to which is fixed, by means of bolts, the cover 3 of the burner; the envelope ends with a pulverized coal nozzle 4; along the axis of the casing is installed a pipe 5 which represents the channel for the supply of the oxidant and which terminates in the nozzle 6. Between the casing 1 and the pipe 5 are arranged one or several helical coils 7, which protrude from the cover of the br 3 and which form the feed pipes 8 of the combust the lower ends open tangentially in the turbulence chamber 9, which consists of the nozzles 4 and 6 intended to supply the the oxidant and pulverized coal and the intermediate partition 10 located between the casing 1 and the cylinder 5, which forms the channel intended for supply

oxidant.

  The burner operates as follows: The oxidizing product, which flows from the internal volume of the burner, is sent to the nozzle 6 via the cylinder 5. It is via tubing and coils 7 that the stream of pulverized coal is fed, along with the carrier gas, from the different sections of the feeder. This current arrives, via the lower ends, tangentially arranged, coils 7, in the turbulence chamber 9, in which the different currents come together to form a single current and rotating pulverized coal, which

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  exits through the nozzle 4. An interaction between this current and the oxidant stream is created, which creates a safe flame.

and stable.

  The manufacture of the burners according to the invention is less expensive than in the current state of the art, because it is simpler and uses elements already manufactured in the industry.

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Claims (1)

R E V E N D I C A T I ON   Pulverized coal burner, consisting of an enclosure provided with an outlet nozzle of an axial pipe having a nozzle for supplying oxidant and helical elements for supplying pulverized coal, burner characterized in that the elements for supplying the pulverized coal are coils (7) with one or more turns, arranged between the central pipe (5) and the casing (1) the ends of the coils (7) emerging tangentially. through the intermediate wall (10) to ensure the joining of the different currents of pulverized coal into a single stream in a turbulence chamber (9) formed by the pulverized coal nozzle (4) at the end of the casing (1), the nozzle (6) of the tube (5) and the intermediate wall (10).