CN202792536U - Water pipe type condensation hot water boiler - Google Patents

Abstract

The utility model discloses a water pipe type condensation hot water boiler and belongs to the field of heating equipment. The water pipe type condensation hot water boiler comprises a furnace body and a smoke flue. A two-stage heating exchanging device is arranged in the smoke flue, wherein the two-stage heating exchanging device comprises an economizer and a condenser. The water pipe type condensation hot water boiler is capable of sufficiently using the waste heat of the smoke flue. Gas exhausting temperature is lowered. The economizer and the condenser are made of specific materials by using a specific technology and can effectively endure the corrosion of smoke and are durable in use. Due to the fact that the inlet water and the outlet water of the economizer and the condenser are directly communicated with the inflow water and backflow water of the furnace, heat exchanging energy is used timely and conveniently, discharge amount of noxious gas is reduced and energy-saving effect and environment-friendly effect are remarkably achieved.

Description

Water tube condensing hot water boiler

technical field

The utility model relates to a boiler, in particular to a fuel and gas type water tube condensing hot water boiler, which belongs to the field of heating equipment.

Background technique

Boiler is a kind of heating equipment. It uses coal, oil or gas as fuel, and generates heat through combustion to produce steam or hot water. The smoke and slag produced by coal will pollute the environment and endanger people's health. The technology and the treatment of flue gas are relatively complicated, and oil-gas fuel is easy to transport and use. Under good combustion conditions, it basically does not produce environmental pollution and has a high calorific value. In recent years, oil-fired gas boilers have been widely used due to their small size, high degree of automation, and convenient installation. Urban heating boilers consume a large amount of primary energy and emit a large amount of pollutants. Traditionally, my country's heating boilers mainly use coal as the host. With the improvement of urban living standards, in order to improve urban air quality, the use of clean energy has become a trend. Over the years, our country has discovered and exploited a large amount of natural gas, and established a large-scale project of west-east gas transmission. Some areas (such as Beijing and Xi’an) stipulate that coal-fired heating boilers are not allowed to be built in urban areas, and strongly recommend the use of natural gas boilers. In order to avoid low-temperature corrosion of the rear heating surface, the exhaust gas temperature of traditional coal-fired heating boilers is usually higher than 150 ℃, and the steam The boiler is even higher than 200 ℃. After using natural gas, the exhaust gas temperature of most hot water boilers is between 140 and 200 ℃, which not only consumes a lot of energy, but also increases the operating cost of the boiler. The flue gas discharged by the boiler has a relatively high temperature of 150~250°C, and contains about 15%~19% (volume) of water vapor, which is the main carrier of the heat of the flue gas. If the exhaust gas temperature of the boiler is lowered to a sufficiently low level, the superheated water vapor in the flue gas will condense and release the latent heat of vaporization, and the boiler that can recover the latent heat of vaporization in the flue gas is called a condensing boiler. The traditional flue heat exchange design has defects such as low efficiency, easy corrosion of equipment, and untimely and convenient use of waste heat, which leads to a decrease in the overall efficiency of the boiler and wastes a lot of energy.

Contents of the invention

The utility model provides a long-term, economical and durable water tube condensing hot water boiler which can fully, conveniently and timely utilize the residual heat of the flue.

The water tube type condensing hot water boiler provided by the utility model includes a furnace body and a flue, and a two-stage heat exchange device economizer and a condenser are arranged in the flue. , the outlet water is connected to the boiler feed water through the No. 2 collecting tank, and the return water and the flue gas are countercurrent. The condenser water is connected to the boiler return water through the No. 3 collecting tank, and the outlet water is connected to the boiler feed water through the No. It is in a countercurrent state with the flue gas. The condenser is composed of high-frequency welded finned tubes, and the material is ND steel. The heat exchange tube of the condenser (4) is made of steel-aluminum composite finned tubes, and the shell is made of enamel anti-corrosion .

The water tube type condensing hot water boiler provided by the utility model has an economizer and a condenser installed in the flue, which can better utilize the waste heat of the flue and reduce the exhaust gas temperature. The economizer and the condenser adopt specific processes and materials, which are smoke-resistant The gas environment is corrosive and durable. The inlet and outlet water of the economizer and the condenser are directly connected with the boiler inlet and return water, which makes use of the heat exchange energy in a timely and convenient manner, and has a significant energy-saving effect. Another function of flue gas condensation is to reduce The emission of NOx, on the one hand, due to the improvement of the thermal efficiency of the condensing boiler, reduces the consumption of fuel and reduces the total emission. On the other hand, due to the absorption of NOx by the condensate, the emission is further reduced. It can be seen that the utility model It has good economic and environmental benefits.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the utility model.

Accompanying drawing 2 is the schematic flow chart of working fluid of the present utility model.

Detailed ways

In order to fully explain the implementation of the utility model, a specific embodiment of the utility model is provided. This embodiment is only an illustration and explanation of the utility model, and does not limit the scope of the utility model.

As shown in the attached figure, an economizer 3 and a condenser 4 are installed in the boiler flue, and the boiler can be a hot water boiler with double-drum vertical arrangement, full-membrane water-cooled wall, D-shaped furnace natural circulation, and slight positive pressure combustion. The burner is arranged on the front wall. After the fuel is fully burned in the furnace, it turns 90° and enters the convection tube bundle. The flue gas flows from the convection tube bundle through the flue into the economizer 3 and the condenser 4, and then enters the chimney to be discharged. The rear wall of the furnace is arranged Explosion-proof door, economizer 3 is composed of finned tubes, which are processed by high-frequency welding. One end of the shell side of economizer 3 is connected with the convection heating surface, and the other end is connected with the shell side of condenser. Condenser 4 is used To further reduce the exhaust gas temperature and absorb the latent heat of vaporization of water vapor in the tail flue gas, the heating surface of the condenser is mainly composed of high-frequency welded finned tubes, and the material is ND steel. ND steel is the most ideal sulfuric acid resistant low temperature at home and abroad. Steel for dew point corrosion, used to manufacture heat exchangers and evaporators serving in high-sulfur flue gas. It has excellent acid corrosion resistance and chloride ion corrosion resistance. Enamel anti-corrosion is adopted. The finned tubes in the economizer 3 and the condenser 4 are arranged in parallel or staggered rows. There are 4 water collection tanks in the economizer 3 and the condenser 4. The heat exchange elements are steel-aluminum composite finned tubes. , the steel-aluminum composite finned tube is connected to the water collection tank, and the boiler return water is divided into two parts before entering the condenser, one part enters the No. 2 water collection tank 7, the other part enters the No. 4 water collection tank 5, and then enters the economizer 3 and Condenser 4, after heat exchange, they are collected into the No. 1 and No. 3 water collection tanks respectively, and then enter the boiler feed water, and the return water and the flue gas are in a countercurrent state. the

According to the water vapor partial pressure coefficient, it can be known that the dew point of water in the flue gas is generally 56-60 ° C. By using a cold medium to reduce the temperature of the flue gas to below the dew point, the sensible heat and latent heat of the flue gas are recovered at the same time. It can absorb some harmful gases such as SO2 and NOx, which reduces the emission of pollutants and is beneficial to environmental protection. The utility model can significantly improve the thermal efficiency of the boiler, and the theoretical flue gas volume produced by burning 1NM3 natural gas is about 10.3 NM3 (about 12.5KG). Taking the excess air coefficient of 1.3 as an example, the flue gas 14 NM3 (about 16.6KG) is generated, the temperature of the flue gas is lowered from 200°C to 70°C, the physical sensible heat is released about 1600KJ, the condensation rate of water vapor is 50%, and the latent heat of vaporization is about 1850 KJ, the total heat release is 3450 KJ, which is about 10% of the low calorific value of natural gas. If 80% of the flue gas is taken into the heat energy recovery device, the heat energy utilization rate can be increased by more than 8%, and the natural gas fuel can be saved by nearly 10%, without the need for additional environmental protection device.

After describing the implementation of the present utility model in detail, those who are familiar with the technology can clearly understand that various changes and modifications can be carried out without departing from the scope and spirit of the above-mentioned patent application. Any simple modifications, equivalent changes and modifications made in the examples all belong to the scope of the technical solution of the utility model, and the utility model is not limited to the implementation manners of the examples cited in the specification.

Claims (5)

1. waterpipe type condensation heat homogeneous solution-type reactor comprises body of heater (1), flue (2), it is characterized in that: be provided with two-stage heat-exchanger rig energy-saving appliance (3) and condenser (4) in flue.

2. waterpipe type condensation heat homogeneous solution-type reactor according to claim 1, energy-saving appliance (3) entry links by No. 1 header tank (7) and boiler blow-down water, and water outlet links by No. 2 header tanks (8) and boiler feedwater, and backwater and flue gas are adverse current.

3. waterpipe type condensation heat homogeneous solution-type reactor according to claim 1, condenser (4) entry links by No. 3 header tanks (5) and boiler blow-down water, and water outlet links by No. 4 header tanks (6) and boiler feedwater, and backwater and flue gas are the adverse current state.

4. waterpipe type condensation heat homogeneous solution-type reactor according to claim 1, it is characterized in that: described condenser (4) is comprised of high frequency welded fin-tube, and material adopts the ND steel.

5. water waterpipe type condensation heat homogeneous solution-type reactor according to claim 1 is characterized in that: described condenser (4) heat exchanger tube employing steel-aluminum composite fin tube, housing employing enamel anticorrosion.

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