RU1806309C - Horizontal cyclone furnace - Google Patents

Abstract

Usage: in the chemical industry for burning liquid sulfur. SUMMARY OF THE INVENTION: a horizontal cyclone furnace is made detachable into two parts in a vertical plane near the front wall with the possibility of moving this wall in the axial direction, the connector being made in the form of annular partitions attached to the shells of the air jacket of each furnace part, covering the section of the shirt and provided with holes for the passage of air from one part of the shirt to another and means for fastening them, and the joint of the partitions from the inside is sealed with the help of one attached to one of the partitions approx ring of refractory material adapted to mate with the end faces of its walls lined both sides of the furnace at their connection and sliding engagement with the sidewall of the air jacket. 6 ill., 1 tablet,

Description

(/)

WITH

The invention relates to the chemical industry, in particular to the design of furnaces for burning liquid fuel, e.g., liquid sulfur.

The purpose of the invention is to increase operational reliability by improving its maintainability.

In FIG. 1 shows the proposed furnace, general view; in FIG. 2 is a section A-A. in FIG. 1; in FIG. 3-5 are variants of the assembly. 1 in FIG. 1; in FIG. 6 is a section BB in FIG. 1.

The horizontal cyclone furnace 1 is detachable and contains two parts: a combustion chamber 2, a chamber 3, a front wall 4, an air jacket 5, a partition wall in the form of a connector 6.

The connector 6 with an annular protrusion 7 of refractory brick includes fastening clamps 8, annular partitions 9 and 10, which are attached to the shells 11, 12 of the air jacket 5.

 The connector 6 divides the air jacket 5 into annular chambers 13 and 14, which are externally limited by the housing 15, and have openings 16 around the perimeter, and the annular chamber 13 adjacent to the front wall 4 is provided with profiling plates 17 that form the channels 18. passing to the center the front wall 4 into the tangential nozzle system 19.

The furnace also has stepped tuyeres 20 and 21, the entry nozzle 22. fitting 23, two aerodynamic clamps 24 and 25.

00

o o o o o o

Gj

The front wall 4 includes a cover 26 and a casing 27, between which the air jacket 5 is located, and rollers 28 for moving it.

A horizontal cyclone furnace operates as follows.

Cold air through the nozzle 23 and the annular chamber 14 enters the separation wall b and through the system of holes 16 is supplied to the channels 18, and from the tangential nozzles 19 enters the combustion chamber 2 in the form of a tangentially swirling flow. The holes 16 are located around the circumference of the partition wall 6, which is presented in the form of a connector consisting of partition walls 9 and 10. The holes 16 are connected to the air jacket of the annular chambers 13 and 14. The annular protrusion 7 of the furnace is made of refractory material and is a sealing assembly annular chamber 13 and 14. The annular chamber 14 has the ability to move with the rollers 2.8. .

The air stream enters the combustion chamber of a horizontal cyclone furnace in parts: through aerodynamic clamps 24 and 25, tuyeres 20 and 21, and tangential nozzles 19.

 8-10% of the total amount of air enters the aerodynamic clamps. The air flow rate is regulated by special valves, changing the air flow rate changes its hydrodynamic resistance and the relative speed between the fuel particles and the gas flow, and also contributes to better oxidation of unburned fuel particles.

About 80% of the air enters the tangential step tuyeres 20 and 21. The tuyeres 21 are made stepwise and are installed between the aerodynamic clips 24 and 25 closer to the aerodynamic clip 24. This arrangement of the tuyeres substantially creates a positive effect. When the flow of fuel combustion products exits through the central opening of the aerodynamic pinch 24, it no longer has rotational motion and the speed of motion of unburned fuel particles is close to the velocity of the gas part of the flow, the flow motion is translational. When there is an additional step tuyere in the afterburning chamber, then the air leaving it at a speed of 35-50 m / s swirls the gas flow and mixes with it. There is an increase in relative velocity, i.e. the difference in speed between the fuel particle and the oxidizing agent increases, the rate of the combustion reaction increases, and the residence time also increases

large particles in the furnace, as under the influence of centrifugal flow forces, they are discarded from the center to the periphery and their path becomes longer.

The tangential step tuyeres 20 are installed in the combustion chamber, the air leaves them at a speed of 35-50 m / s and its kinetic energy is sufficient to spray the fuel jet and mix it

0 uniformly in its mass.

. The air entering the nozzles 19 cools the lining of the furnace and the front wall, as well as the partition wall 6 from the excess heat of the flue gases and

5 prevents the entry of flue gases into the annular chambers 13 and 14.

If there are no openings 16, then the air will not flow from the annular chamber 14 into the annular chamber 13, then the annular partition 6 will not cool and under the influence of heat from the flue gases it will overheat and often fail.

In addition, in the place of the connector of the separating partition 6, the flue gases will flow out of the combustion chamber, since there will be no excess air pressure; therefore, the annular dividing partition 6. has a protrusion 7.

0 If the annular partition 6 is made one-piece, then the front wall 4 cannot be disconnected from the combustion chamber 2 and for inspection and repair work it will be necessary to create

5 special hatches, and also in this zone will not be cooled, heat emission to the environment will increase, the lining service life will decrease.

Holes 16 are evenly spaced

0 around the circumference of the annular dividing wall 6, therefore, air from the annular chamber 14 flows uniformly into the annular chamber 13 and fills the channels 18 formed by the guiding Profi-5 lining plates 17.

As approaching the nozzles 19, the cross section of the channels 18 decreases and becomes minimal at the nozzle exit 19.

Therefore, at the nozzle exit 19, the highest air velocity is taken into account, and the air has a tangential rotation.

Since the air comes into contact with the hot surfaces of the furnace, it heats up.

5 and since hot air is in contact with the fuel supply device (nozzle, burner), it heats the fuel, the hot fuel burns better.

When air enters the combustion chamber 2, it spreads over the lining and prevents the lining of the front wall 4 from being coked by unburned particles of liquid or solid pulverulent fuel, as well as turbulent flows and allows fuel to be burned with less excess air, which reduces the formation of nitrogen oxides.

Fuel oil is fed axially through the nozzle through an opening formed by the tangential nozzle system 19, where it is heated with hot air, then mixed with it in the combustion chamber and burned. The combustion products have a rotational movement and flow along the combustion chamber 2 to the aerodynamic clamps 24 and 25, after which they are disposed of.

The equipment of the front wall 4 with rollers 28 makes it possible to quickly and effortlessly detach the front wall 4 from the combustion chamber 2.

Example. The cyclone furnace is made according to the devil. FIG. 1-3 or 4, or 5, 6. The front wall consists of an annular chamber formed by a cover and a casing. The cap has guide plates whose ends form a tangential nozzle system.

The cyclone furnace has an air jacket, a fitting for introducing cold air and is connected to the front wall by a perforated dividing wall made of two parts. The front wall has roller devices, parts of the partition wall are fastened to each other with clamps. Liquid sulfur with a lower calorific value of 9100 kJ / kg is burned in a cyclone furnace.

The cyclone furnace works with the following indicators.

The amount of air entering the air gap, nm / h, 25000

The temperature of the air entering the air gap, ° C, 150

Air temperature before dividing wall, ° С, 190

Air temperature in front of the nozzle, ° С, 210

Sulfur consumption, kg / h. 4500

Thermal stress of the furnace volume, kJ / m3. 9.6 -1.06

The coefficient of the exhaust air in the combustion chamber, and 1.02

The coefficient of excess air in the afterburner and before entering the recovery boiler, torus, "1 1,56

The temperature of the torch in the combustion chamber. ° C, 1800

The temperature of the products is burned at. inlet to the recovery boiler, ° CJ300

The amount of nitrogen oxides before entering the boiler utilizer, mg / nm, 35-40

Overhaul mileage of the front wall lining, months j24-30 Relatively known cyclone firebox according to ed. testimonial. USSR No. 1200077, class F 23 C 5/06 ,. adopted as a prototype, the proposed drum dryer has advantages and a positive effect, which are reflected in the table below.

Thus, the equipment of the front wall of a horizontal cyclone furnace with a perforated dividing

5 by a partition consisting of two interconnected parts with a refractory protrusion located between the front wall and the stepped tuyeres, as well as equipping the camera with guides

0 plates limiting the narrowing channels in the form of tangential nozzles, allows you to cool the front wall with air, which increases the overhaul mileage of the cyclone furnace by 2

5 times, and also intensifies the process of fuel oxidation, as a result of which the coefficient of excess, air and the amount of formed nitrogen oxides are reduced. In relation to the prototype for burning sulfur, the proposed cyclone furnace allows to increase the turnaround time, 1.5-2 times “reduce the formation of nitrogen oxides by 1.5-2 times, reduce emissions to the environment and increase the thermal stress of the furnace volume5 by 5-6%. A detachable dividing wall makes access to the furnace more secure and reduces labor costs for assembly and disassembly operations.

Claims (1)

0. The claims A horizontal cyclone furnace containing a housing with an air jacket, a lining and an axial burner located on the front wall 5 and communicating with the air jacket through the air, characterized in that, in order to increase operational reliability by improving its maintainability, the furnace is detachable on 0 two parts in a vertical plane near the front wall with the possibility of moving the latter in the axial direction, and the connector is made in the form of an air jacket attached to the shells 5 of each part of the furnace of the annular partitions, overlapping the section of the shirt and provided with holes for the passage of air from one part of the shirt to the Other and means for fastening them, and the joint of the partitions from the inside of the furnace is sealed with attached to one of the partitions of the ring of refractory material, made with the possibility of mating its end walls with the lining of both parts of the furnace when they are connected, and sliding engagement with the shell of the air jacket. Compiled by A. Sidorovich / H / S. About Editor S.Kulakova Tehred M. Morgenthal. Corrector - I. Shmakova Order 971Signed circulation, VNIIIPI of the State Committee for Inventions and Discover under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Rauska nab., 4/5