CN204880676U - Integrative stove of direct contact formula waste heat recovery ordinary pressure - Google Patents

Abstract

The utility model discloses a <b>direct contact waste heat recovery normal pressure integrated furnace</b>, the main components include a burner, a shell, a furnace, a front smoke box, a box heat exchanger, a rear smoke box, a smoke Gas waste heat recovery device and water outlet pipe, wherein the flue gas waste heat recovery device includes a bubbler, a float solenoid valve, an overflow pipe, a hidden atmosphere communication port, a sprayer and a smoke exhaust pipe, and it is characterized in that the shell and the smoke The gas waste heat recovery device is integrated; the furnace liner, front smoke box, rear smoke box and box-type heat exchanger are all immersed in the furnace water to form a full wet back structure. The flue gas discharged from the furnace enters the flue gas waste heat recovery device through the front smoke box, box heat exchanger, and rear smoke box, and is discharged from the exhaust pipe after directly contacting the boiler return water for heat exchange; the return water absorbing the waste heat of the flue gas Enter the casing through the hidden atmosphere communication port, and the furnace water is heated by the box heat exchanger and the furnace in turn, and then discharged from the water outlet pipe on the top of the casing. The boiler has compact structure, high waste heat recovery efficiency, low exhaust gas temperature, and high total boiler thermal efficiency.

Description

Direct contact waste heat recovery atmospheric pressure integrated furnace

technical field

The utility model relates to a direct contact waste heat recovery normal pressure integrated furnace, which belongs to the technical field of boilers.

Background technique

The flue gas emitted by gas-fired boilers and the waste gas emitted from various production processes contain a large amount of waste heat. Direct discharge into the atmosphere not only pollutes the environment but also wastes a lot of heat energy. Therefore, the recovery and utilization of waste heat from flue gas is an important way to save energy and reduce emissions.

Aiming at the problem of high exhaust gas temperature of gas-fired boilers, some solutions have been proposed at home and abroad, such as setting an economizer at the tail of the boiler. Usually the indirect heat exchange heat exchanger - finned tube heat exchanger is used, water flows inside the tube, and flue gas flows outside the tube. This method can effectively reduce the temperature of the flue gas, but this kind of heat exchanger is generally used as a Independent components, little consideration is given to designing the economizer and the boiler as an integral structure, which makes the structure of the boiler system not compact enough, because a special space is required to place the economizer. So this approach is unreasonable.

Considering that the gas in the country's "West-to-East Gas Transmission" is very clean, so the smoke exhaust from the boiler is also relatively clean. This utility model proposes an economizer using direct contact heat exchange, and reasonably combines the economizer with the boiler , designed as a whole.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a direct contact waste heat recovery atmospheric pressure integrated furnace.

The technical scheme adopted by the utility model is: direct contact waste heat recovery atmospheric pressure integrated furnace , the main components include burner, shell, furnace, front smoke box, box heat exchanger, rear smoke box, flue gas waste heat recovery device and outlet pipe, wherein the flue gas waste heat recovery device includes a bubbler, a float solenoid valve, an overflow pipe, a hidden atmosphere communication port, a shower and a smoke exhaust pipe, and it is characterized in that the shell and the flue gas waste heat recovery The furnace is integrated; the furnace, the front smoke box, the rear smoke box and the box heat exchanger are all immersed in the furnace water to form a full wet back structure. The flue gas discharged from the furnace enters the flue gas waste heat recovery device through the front smoke box, box heat exchanger, and rear smoke box, and is discharged from the exhaust pipe after directly contacting the boiler return water for heat exchange; the return water absorbing the waste heat of the flue gas Enter the casing through the hidden atmosphere communication port, and the furnace water is heated by the box heat exchanger and the furnace in turn, and then discharged from the water outlet pipe on the top of the casing.

The main heat exchange surface of the integrated furnace includes two parts, the furnace and the box-type heat exchanger. The upper furnace is arranged in the way of arrangement, and the combustion method in the furnace is the central back-burning type.

The box-type heat exchanger is a rectangular parallelepiped formed by four flat plates vertically butted and welded. Heat pipes can be light pipes or finned pipes.

The flue gas waste heat recovery device is a trapezoid whose bottom surface is a slope, and is combined with the rear smoke box. The upper part of the flue gas waste heat recovery device is equipped with a bubbler. The inlet of the bubbler is connected to the outlet of the rear smoke box. The gas waste heat recovery device communicates with the shell through the hidden atmosphere communication port at the bottom, which constitutes the atmosphere communication device of the boiler.

The bubbler is formed by folding two-thirds of the surface of a rectangular plate with a triangular cross-section. One end is fixed on the side plate of the flue gas waste heat recovery device and communicates with the rear smoke box, and the other end is sealed and welded with a round Triangular plates with holes whose interior is filled with ring.

The flue gas waste heat recovery device has two return water structures, one is the return water pipe in the middle, and the other is the sprinkler at the top.

The water level of the flue gas waste heat recovery device adopts a dual control structure, one is controlled by a float solenoid valve, and the other is controlled by an overflow pipe.

Compared with the prior art, the beneficial effects of the utility model are as follows: 1. The boiler adopts the central back-firing type, and adopts a large furnace with higher heat absorption efficiency, which can reduce subsequent heat exchange surfaces, make the overall structure of the boiler more compact and simple, and reduce Manufacturing cost price; 2. The rear end of the furnace adopts an elliptical head, which is conducive to the rotation of the flame in the furnace, avoiding the dead angle of rotation, and reducing the loss of rotation power; 3. The combustion chamber formed by the furnace and the front smoke box increases The heat exchange area of the combustion chamber is increased, and the full wet back structure is used at the same time, which is beneficial to improve the heat exchange efficiency and reduce the surface temperature of the shell; 4. The box heat exchanger can be processed separately, which is convenient to manufacture and avoids the high temperature flue gas on the heat exchange The weld between the tube and the tube sheet causes damage, which improves the service life of the boiler; 5. The shell and the flue gas waste heat recovery device adopt an integrated design, which makes the overall structure of the boiler more compact and the total thermal efficiency is higher; 6. Flue gas The waste heat recovery device adopts the direct contact heat exchange method, which effectively saves the heat exchange area, and the built-in bubbler makes the flue gas distribution more uniform; 7. The shell and the flue gas waste heat recovery device pass the working medium on both sides through the hidden atmospheric communication port 8. The water level control of the flue gas waste heat recovery device has double protection, one is the float solenoid valve control, the other is the overflow pipe Control, which can effectively control the water level in the boiler to not exceed the warning water level, which greatly improves the safety of the boiler system; 9. The water level of the boiler and the water level of the flue gas waste heat recovery device are kept consistent through the hidden atmospheric communication port, which can reduce the opening of the boiler shell, Reduce the possibility of leakage.

Description of drawings

Accompanying drawing 1 is the structure diagram of direct contact waste heat recovery atmospheric pressure integrated furnace;

Accompanying drawing 2 is A-A sectional view of direct contact waste heat recovery atmospheric pressure integrated furnace;

Accompanying drawing 3 is the structural schematic diagram of the bubbler of the flue gas waste heat recovery device.

Reference signs: 1-burner, 2-front smoke box, 3-outlet pipe, 4-shell, 5-furnace, 6-rear smoke box, 7-exhaust pipe, 8-sprayer, 9- Float solenoid valve, 10-flue gas waste heat recovery device, 11-overflow pipe, 12-bubbler, 13-implicit atmospheric communication port, 14-box heat exchanger.

Detailed ways

The implementation of the direct contact waste heat recovery atmospheric pressure integrated furnace will be further described below in conjunction with the accompanying drawings.

The assembly process of the direct contact waste heat recovery atmospheric pressure integrated furnace: firstly select the appropriate burner and furnace according to the boiler model, calculate the heat exchange area required by the boiler according to the heat exchange amount, and then distribute the heat exchange surface reasonably. In order to make the boiler structure as compact as possible and the volume as small as possible, a method that can effectively improve the heat exchange effect is adopted. The box-type heat exchanger is made into a cuboid, and the water pipes are vertically arranged inside it, perpendicular to the flow direction of the flue gas. This horizontal flushing method can improve the convective heat transfer coefficient on the side of the flue gas; the temperature of the flue gas coming out of the rear smoke box Generally, there is still 150°C~200°C. If the flue gas temperature can be lowered below the dew point temperature (about 57°C), not only can most of the sensible heat of the flue gas be recovered, but also the latent heat of water vapor in the flue gas can be recovered. . The spray waste heat recovery method selected by the utility model is to exchange heat through direct contact between flue gas and water. The main reason for adopting this method is that the natural gas selected by gas-fired boilers is relatively pure, with few impurities, and directly contacts heat exchange. the highest efficiency. If a waste heat recovery device is specially installed at the end of the boiler, it will take up a large space. In order to save space, the flue gas waste heat recovery device and the boiler are integrated. The flue gas outlet of the boiler main body is connected to the bubbler of the flue gas waste heat recovery device, and the water tank of the flue gas waste heat recovery device is connected to the water tank of the boiler through the hidden atmosphere communication port, which can reduce the number of openings on the boiler body and reduce the possibility of leakage possibility. The water level of the boiler is controlled by the water level control device of the flue gas waste heat recovery device. The water level control device has double protection, one is controlled by the float solenoid valve, and the other is controlled by the overflow pipe. water level. Holes are opened on the return water pipe of the boiler and sprinklers are installed. On the one hand, the boiler water can be replenished at any time, and on the other hand, the exhaust gas temperature can be reduced, achieving a double effect.

When the direct contact waste heat recovery and atmospheric pressure integrated furnace is in operation, the flue gas flow: when the flame ejected from the burner meets the furnace wall at the other end of the furnace, it is reflected back, reaches the front smoke box, and then follows the actual The arrow reaches the bubbler, directly contacts with water to release heat, and finally the water mist sprayed through the sprinkler is discharged from the exhaust pipe; water circulation system: the boiler return water reaches the flue gas waste heat recovery device through the sprinkler, and the flue gas After contact with heat absorption, it reaches the shell through the hidden atmospheric communication port to exchange heat with the flue gas and the furnace, and when the temperature reaches the set value, it is discharged from the outlet pipe. The entire boiler design process makes full use of each heat exchange surface. The boiler structure is compact and beautiful, and the heat exchange efficiency is high. It is a boiler structure worthy of promotion.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (7)

1. A direct contact waste heat recovery atmospheric pressure integrated furnace , the main components include a burner, a shell, a furnace, a front smoke box, a box heat exchanger, a rear smoke box, a flue gas waste heat recovery device and a water outlet pipe, wherein The flue gas waste heat recovery device includes a bubbler, a float solenoid valve, an overflow pipe, a hidden atmosphere connection port, a shower and a smoke exhaust pipe, and is characterized in that the shell and the flue gas waste heat recovery device are integrated; The tank, the front smoke box, the rear smoke box and the box heat exchanger are all immersed in the furnace water to form a fully wet back structure. 2. The direct contact waste heat recovery atmospheric pressure integrated furnace according to claim 1, characterized in that the main heat exchange surface of the integrated furnace includes two parts, the furnace and the box-type heat exchanger, and the arrangement of the upper furnace is adopted , The combustion method in the furnace is the central back-burning type. 3. The direct contact waste heat recovery atmospheric pressure integrated furnace according to claim 1, characterized in that the box-type heat exchanger is a rectangular parallelepiped formed by vertically butting and welding four flat plates, and the two ends are used as flue gas inlet The upper and lower panels of the outlet are used as tube sheets, and the heat exchange tubes are vertically fixed on the upper and lower tube sheets by welding. The heat exchange tubes can be smooth tubes or finned tubes. 4. The direct contact waste heat recovery atmospheric pressure integrated furnace according to claim 1, characterized in that, the flue gas waste heat recovery device is a trapezoidal body with a sloped bottom surface, which is combined with the rear smoke box, and the waste heat of the flue gas The upper part of the recoverer is equipped with a bubbler, the inlet of the bubbler communicates with the outlet of the rear smoke box, and the flue gas waste heat recoverer communicates with the shell through the hidden atmospheric communication port at the bottom, which constitutes the atmospheric communication device of the boiler. 5. The direct contact waste heat recovery and atmospheric pressure integrated furnace according to claim 1, characterized in that the bubbler is formed by folding two-thirds of a rectangular plate with a cross-section of a triangle, and one end It is fixed on the side plate of the flue gas waste heat recovery device and communicated with the rear smoke box, and the other end is sealed with a triangular plate with a round hole, and its interior is filled ring. 6. The direct contact waste heat recovery atmospheric pressure integrated furnace according to claim 1, characterized in that the flue gas waste heat recovery device has two return water structures, one is the return pipe in the middle, and the other is the spray at the top device. 7. The direct contact waste heat recovery atmospheric pressure integrated furnace according to claim 1, characterized in that the water level of the flue gas waste heat recovery device adopts a dual control structure, one is controlled by a float solenoid valve, and the other is controlled by an overflow pipe .