CN108036332A - A kind of water bar of pipe laying casting - Google Patents

Abstract

The present invention relates to the field of burning, and in particular to a kind of water bar applied on incineration furnace grate.The water bar body is casting, and cooling water pipe is embedded with the body, and cooling water pipe is used as water cavity in fire grate segment；One end of the cooling water pipe of the fire grate segment is equipped with water inlet, water outlet, and welded stub connection, easy to be connected with cooling water system；Two interfaces of the other end of the cooling water pipe of told fire grate segment are connected by connecting tube, are circulated easy to cooling water in fire grate segment water cavity.Fire grate segment surface temperature can be dropped to less than 250 degrees Celsius by the present invention, make fire grate segment life-span upgrading more than 5 years, and maintenance period extends more than 20%, greatly reduces operation cost.

Description

A water-cooled grate piece cast by buried tube

technical field

The invention relates to the field of incineration, in particular to a water-cooled grate piece applied to the grate of an incinerator.

Background technique

Due to the different types of waste, it can be divided into domestic waste, high calorific value domestic waste, industrial waste, medical waste, biomass waste, etc. Among them, the calorific value of domestic waste is low. At present, mechanical grate furnaces have gradually occupied the leading position in domestic waste incineration due to their strong adaptability, reliable operation and high controllability.

The traditional mechanical grate furnace is mainly air-cooled. The primary air is blown into the furnace by the ash hopper under the grate. When the primary air stays at the bottom of the grate, the labyrinth arrangement structure at the bottom of the air-cooled grate serves as a diversion The role is to guide the primary air to cool the surface temperature of the grate and prevent the grate from burning.

However, the cooling effect of air cooling is limited, and it is not suitable for other waste incineration with high calorific value.

The grate slices of the existing mechanical grate do not have the function of water cooling, and the fuel adaptability is poor. When burning fuels with higher calorific value, such as biomass, the surface temperature of the grate slices will be as high as four to five degrees. Increase the frequency of grate replacement, and then affect the operating costs and economic benefits of domestic waste incineration plants. In order to make the mechanical grate furnace useful in the incineration of high calorific value domestic waste, industrial waste, medical waste and biomass waste with high calorific value, water cooling design has become a trend. The water-cooled grate is more adaptable to the calorific value of waste, which makes it possible to mix and burn various wastes, thereby increasing economic benefits.

Contents of the invention

The object of the present invention is to overcome the shortcomings of the above-mentioned prior art, and propose a water-cooled grate piece with integrated casting of buried pipes.

Concrete technical scheme of the present invention is:

A water-cooled fire grate cast by buried pipes, the body of the water-cooled fire grate is cast, and a cooling water pipe is pre-embedded in the body, and the cooling water pipe is used as a water cavity in the fire grate; one end of the cooling water pipe of the fire grate is provided with an inlet Water inlet, water outlet, and welded pipe joints are convenient for connection with the cooling water system; the two interfaces at the other end of the cooling water pipe of the grate piece are connected through connecting pipes to facilitate the circulation of cooling water in the water chamber of the fire grate piece.

Further, in order to achieve a uniform cooling effect on the water in the cooling water pipes, the cooling water pipes are arranged in a double U-shaped longitudinal arrangement inside the grate.

Further, a thermocouple is installed at the lower part of the water-cooled grate piece to measure the surface temperature of the grate, and judge the garbage burning situation on the surface of the grate from the temperature data. By adjusting the running speed of the grate, increasing or decreasing the air volume, and adjusting the water speed, etc., it can effectively avoid The leakage of the water chamber occurs, and it also improves the overall combustion efficiency of the incinerator.

When the invention is in operation, water is supplied by the circulating cooling water system, and the external water pipe is connected to the water inlet joint and the water outlet joint. In the U-shaped tube, it flows to the smaller U-shaped tube through the connecting interface and stainless steel connecting pipe, and finally flows out through the water outlet joint to cool the water-cooled grate by heat convection.

The beneficial effects of the present invention are:

Because the water-cooled grate piece buried pipe of the present invention is cast and formed, the water-cooled pipe material is made of seamless steel pipe, and the material of the connecting pipe is made of stainless steel; the double U-shaped cooling water pipes are vertically arranged so that the cooling water stays in the grate piece for a longer time, and the entire surface of the grate piece is cooled. The effect is more uniform; when the cooling water leaks, it can be replaced by air cooling, and the main air cooling will not affect the operation of the entire grate system; efficient cooling can increase the calorific value range of the combustion material, and can adapt to the mixed combustion of various wastes; compared with air-cooled furnaces Grate, cooling grate with less air, more suitable for low air ratio combustion, to reduce smoke emissions; reduce the surface temperature of the grate to below 250 degrees Celsius, increase the life of the grate by more than 5 years, and extend the maintenance cycle by more than 20% , greatly reducing operating costs.

Description of drawings

Figure 1 Top view of the water-cooled grate.

Fig. 2 Side view of water-cooled grate piece.

Figure 3 Sectional view of the water-cooled grate.

Fig. 4 Arrangement of water-cooled grate thermocouples.

Figure 5 Schematic diagram of the structure of the water-cooled grate with thermocouples

In the figure: 1—water-cooled grate body, 2—cooling water pipe, 3—water inlet joint, 4—water outlet joint, 5—connecting joint, 6—stainless steel connecting pipe, 101—standard water-cooled grate, 102—with thermocouple Water-cooled grate piece, 201—thermocouple support seat, 202—threading steel pipe, 203—thermocouple mounting seat.

Detailed ways

As shown in Figure 1, Figure 2 and Figure 3, the water-cooled grate body 1 is cast, and the cooling water pipe 2 is included in the water-cooled grate 1 during the casting process. There is an extension of the cooling water pipe at the bottom of the grate, and the water inlet is welded. The joint 3, the water outlet joint 4 and the two connecting joints 5 that are responsible for connecting the double U-shaped cooling water pipes through the stainless steel connecting pipe 6. During operation, water is supplied by the circulating cooling water system, and the external water pipe is connected to the water inlet joint 3 and the water outlet joint 4. At the same time, the stainless steel connecting pipe 6 is connected to the interface 5. The water flows in from the water inlet and flows into the cooling water pipe in the grate. The large U-shaped pipe flows into the smaller U-shaped pipe through the connection interface 5 and the stainless steel connecting pipe 6, and finally flows out through the water outlet joint 4, and the water-cooled grate is cooled by heat convection.

The movable beams and fixed beams of the entire grate frame are arranged alternately, and water-cooled grate pieces 102 with thermocouples can be evenly arranged on the fixed grate beams as required, and the rest are standard water-cooled grate pieces 101, as shown in FIG. 4 . The structure of the water-cooled grate with thermocouple is shown in Figure 5. A thermocouple support seat 201 is welded on the bottom of the standard water-cooled grate, and a thermocouple mounting seat 203 is welded on the inside front of the grate. installation. A threaded steel pipe 202 is welded between the two to protect the thermocouple wires.

Because the above-mentioned fire grate is arranged in a sliding and fixed staggered manner, all the rubbish can roll over under the action of friction on the fire grate, so the effect of loosening the rubbish is better and the combustion is more uniform. The water-cooled grate replaces the original air-cooled grate, which is more adaptable to the calorific value of waste, making it possible to mix and burn various wastes, thereby increasing economic benefits. Compared with the air-cooled grate, the air used for cooling the grate is reduced, which is more suitable for low air ratio combustion to reduce smoke emissions. The surface temperature of the grate is lowered to below 250 degrees Celsius, which increases the life of the grate by more than 5 years, extends the maintenance cycle by more than 20%, and greatly reduces operating costs.

Claims (3)

1. A water-cooled fire grate piece cast by buried pipe, it is characterized in that the water-cooled fire grate body is cast and formed, and a cooling water pipe is pre-embedded in the body, and the cooling water pipe is used as a water cavity in the fire grate piece; the cooling of the fire grate piece One end of the water pipe is provided with a water inlet, a water outlet, and a welded pipe joint, which is convenient for connection with the cooling water system; the two interfaces at the other end of the cooling water pipe of the grate piece are connected through a connecting pipe, which is convenient for the cooling water in the water supply of the fire grate piece. Intraluminal circulation. 2 . The cast water-cooled fire grate according to claim 1 , wherein the water chambers are U-shaped and arranged longitudinally inside the fire grate. 3 . 3 . The cast water-cooled grate according to claim 1 , wherein a thermocouple is arranged at the lower part of the water-cooled grate. 4 .