CN201165516Y - A briquette structure for enhanced combustion - Google Patents

Abstract

The utility model discloses a briquette structure for enhanced combustion, which comprises a square briquette body, a plurality of through step-shaped ventilation holes are evenly arranged between the upper and lower surfaces of the briquette body, and each side of the briquette body has ventilation holes. groove, the upper and lower surfaces of the coal body also have concave surfaces, and 2 ∪-shaped holes are arranged on each wall of the concave surface. In actual use, the small hole end of the stepped through hole faces upwards, and the concave surface and the ∪-shaped hole serve as an air equalization channel when the layers are vertically stacked; thus making the through hole have a strong effect of concentrating firepower, and at the same time when it burns, the flame The speed of ejection is increased, and the length of flame is increased, which is beneficial to the disturbed mixing of gases and achieves the purpose of intensified combustion. The briquette integrates enhanced ventilation, enhanced combustion, enhanced burnout, enhanced firepower, increased flame length, high efficiency and energy saving, and reduced smoke and dust emissions, and has comprehensive energy-saving and emission reduction effects.

Description

A briquette structure for enhanced combustion

technical field

The utility model belongs to the technical field of thermal energy engineering application and relates to a molded coal structure used in combustion equipment of a boiler or a kiln.

Background technique

At present, coal-fired boilers or kilns used in domestic, commercial and industrial fields usually use loose coal or briquette as fuel. When using loose coal fuel, no matter whether it is intermittently adding coal manually or using mechanized moving grate, it will cause smoke and dust pollution caused by fly ash. Moreover, manual coal adding will also cause intermittent smoke and dust pollution. At the same time, Because the loose coal contains a high proportion of fine coal, the coal leakage of the grate increases, which seriously reduces the loss of mechanical incomplete combustion, resulting in a decrease in the thermal efficiency of the boiler and an increase in the coal consumption of the boiler. Moreover, when the loose coal is burned, the porosity of the coal seam is reduced, causing air blockage, and the air cannot be effectively contacted with the fuel. environmental pollution.

In order to promote energy-saving and emission-reduction technologies, save energy, and protect the environment, people began to turn their attention to briquettes. Briquette is the use of mechanical pressing to process various pulverized coal and additives into coal products with certain strength and size, such as: honeycomb briquette, briquette briquette, briquette, etc. With the continuous improvement of coal mining mechanization, the yield of lump coal decreases and the amount of pulverized coal increases greatly. However, when pulverized coal is burned, it will cause coal leakage and fly ash loss, resulting in a decrease in the utilization efficiency of combustibles. After the loose coal is made into briquettes, the loss of coal leakage and fly ash is greatly reduced, the thermal efficiency of boilers and kilns is significantly improved, and the original emission concentration of smoke and dust is greatly reduced, which has the dual advantages of energy saving and emission reduction. Therefore, briquette technology is a kind of Potential clean coal technology, many cities in my country are vigorously promoting briquette technology to alleviate urban smoke pollution.

Technicians have conducted long-term research on the combustion characteristics of briquettes, improved the shape and structure of briquettes, and achieved better energy-saving and emission-reduction effects. However, the briquette technology also has some serious problems, which are manifested in:

(1) The briquette is made by adding sulfur-fixing agent, binder and other components according to the requirements and then mixing and pressing. The volatile content is low and it is not easy to ignite. After ignition, the flame size is short and it is easy to break the fire when the furnace is stopped;

(2) Briquettes contain non-combustibles such as additives, have low calorific value, high ash content, low combustion intensity, and slow furnace raising.

(3) The briquette structure is stacked and densely planted, poor ventilation, melting and bonding, affecting burnout.

In the prior art, the briquettes are usually solid or square briquettes with through holes between the upper and lower surfaces. The central part of the former coal body cannot fully contact with the air, and the combustion and burnout performance of the briquettes is not good; Generally, 2 to 4 layers of briquettes are vertically stacked together and burned in the combustion chamber. The through holes are difficult to center. The blockage of some holes will cause poor ventilation of the multi-layer briquettes, slow chemical reaction, and then increase ash. The carbon content is low, and there will be adhesion between the molded coal and the molded coal, which is not conducive to the full contact between the coal and the air, and is not conducive to combustion.

Contents of the invention

The technical problem to be solved by the utility model is to provide a briquette structure suitable for boiler or kiln combustion equipment with enhanced ventilation, enhanced combustion, enhanced burnout, enhanced firepower, and increased flame length.

In order to achieve the above tasks, the utility model takes the following technical solutions:

A briquette structure for intensified combustion, comprising a square briquette body, characterized in that a plurality of through stepped air holes are evenly arranged between the upper and lower surfaces of the briquette body, and each side of the briquette body Ventilation grooves are arranged, and the upper and lower surfaces of the briquette body also have concave surfaces, and there are 2 ∪-shaped holes on each groove wall of the concave surface grooves.

Other features of the utility model are:

The cross-section of the air hole is circular, rectangular, square, elliptical, rhombus, polygonal or other geometric shapes.

The side ventilation slots run through the molded coal body.

The vertical joints on the surface of the briquette body adopt circular arcs or chamfer transitions to facilitate pressing and forming.

The briquetted coal for enhanced combustion of the utility model, its preparation method is to respectively press a sunk hole (concave surface) on the upper and lower surfaces of the briquette body, and respectively press 2 ∪-shaped holes on the wall of the counterbore (concave surface), as A channel with uniform air flow between different layers of multi-layer briquettes; step-shaped through holes are set between the upper and lower surfaces of the briquettes, and the combustion flame or flue gas forms an increase in the flue gas flow rate and an extension of the flame length at the steps, and at the same time , It also has the effect of concentrating firepower; at the same time, in order to avoid the bonding between the briquettes and the poor ventilation, rectangular ventilation channels that penetrate up and down are designed on the four sides of the briquettes.

When the enhanced combustion briquettes are in use, the small hole end of the stepped through hole should face up, so that the through hole has a stronger effect of concentrating firepower, and at the same time, the flame ejection speed increases during combustion, which is beneficial to The turbulent mixing of air achieves complete combustion; for the ventilation grooves on the upper and lower surfaces and the ∪-shaped holes on the concave groove wall, on the one hand, it can evenly pass the airflow between the holes; on the other hand, it will form turbulent flow in the concave space , so that the coal can be fully burned; the rectangular grooves set up on the side are conducive to fully providing the oxygen required for the side combustion of the coal, and at the same time, it is more conducive to improving the contact position between the adjacent coal when multi-layer coal is superimposed. Oxygen supply conditions are conducive to the overall burn-through and burn-out of the briquette.

The utility model has the advantages of sufficient combustion, and the blockage of individual holes will not affect the ventilation of the corresponding holes of the upper and lower adjacent molded coals. It is convenient to use and has strong firepower. Under the same opening ratio, the combustion reaction is fast and the combustion efficiency is high. , save energy and reduce environmental pollution.

Description of drawings

Fig. 1 is the front view of briquette;

Figure 2 is a full sectional view at the place of Figure 1A-A;

Fig. 3 is the schematic diagram when a plurality of briquettes are burnt together;

Fig. 4 is the schematic diagram when a plurality of briquettes are stacked;

Marked in the figure: coal type body 1, ventilation hole 2, concave surface 3, ventilation slot 4, ∪-shaped hole 5.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the briquette structure of the enhanced combustion of the present invention includes a square briquette body 1, and the upper and lower surfaces of the briquette body 1 are evenly arranged with multiple A through stepped air hole 2, each side of the coal body 1 has a ventilation groove 4, and the upper and lower surfaces of the coal body 1 also have a concave surface 3, and 2 ∪-shaped holes 5 are arranged on each wall of the concave surface 3. And the ventilation hole 2 is a stepped hole whose aperture gradually becomes smaller from bottom to top. The distribution number of the ventilation hole 2 is not fixed. According to the effective area of the concave surface 3, it can be arranged in a 4×4 arrangement or a 5×5 arrangement, that is, for 16 or 25 pcs.

When the briquettes are stacked and used in multiple layers, the concave surfaces 3 on the upper and lower surfaces will separate the briquettes to prevent the burning of the briquettes of adjacent layers from sticking together, and a space is formed between the layers, which is conducive to sufficient oxygen supply and uniformity. to achieve the effect of complete combustion, and even if individual vent holes are blocked, it will not affect the ventilation of the corresponding vent holes of the upper and lower adjacent briquettes. At the same time, the ∪-shaped hole 5 on the concave wall can also mix the airflow and distribute the airflow evenly; the long rectangular ventilation groove 4 arranged on the side of the coal body forms a space between the side and the side of the molded coal, which is beneficial to increase the airflow. contact area with air.

Claims (4)

1. A briquette structure for intensified combustion, comprising a square briquette body (1), characterized in that, a plurality of continuous stepped air holes are evenly arranged between the upper and lower surfaces of the briquette body (1) (2), each side of the briquette body (1) has ventilation grooves (4), and the upper and lower surfaces of the briquette body (1) also have concave surfaces (3), and there are 2 ∪-shaped holes on each wall of the concave surface (3) (5). 2. The enhanced combustion briquette according to claim 1, characterized in that the cross-section of the air hole (2) is circular, rectangular, square, elliptical, rhombus, polygonal or other geometric shapes. 3. The briquette structure for enhanced combustion according to claim 1, characterized in that, said side ventilation groove (4) penetrates the briquette body (1). 4. The enhanced combustion briquette according to claim 1, characterized in that, the vertical connection of the surface of the briquette body (1) adopts a circular arc or a chamfer transition, so as to facilitate pressing and forming.

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