CN205102374U - A boiler tail gas heat recovery device - Google Patents

Abstract

The utility model discloses a heat recovery device for boiler tail gas, which comprises a water tank, which is connected with a water inlet pipe and a water outlet pipe, and also includes a tail gas collection box, a tail gas discharge box and more than two hollow heat exchange tubes. The collection box is installed on the outside of one end of the water tank and has a filtering device inside, the exhaust gas discharge box is installed on the outside of the other end of the water tank, the heat exchange tube is installed in the water tank, and one end of the heat exchange tube is connected to the exhaust gas collection box, The other end is connected with the exhaust gas discharge box; the water outlet pipe is divided into a first water outlet pipe and a second water outlet pipe, wherein the second water outlet pipe is connected to the water inlet of the boiler through a water pump. The idea of heat exchange adopted by the utility model is: heat exhaust gas is transported inside the heat exchange tube, and water is outside the heat exchange tube. Compared with the prior art, the thermal efficiency of the boiler is improved, energy is saved, and the pollution of the boiler exhaust gas to the environment can also be reduced. , and not easily damaged by water corrosion.

Description

A boiler tail gas heat recovery device

technical field

The utility model discloses a waste heat recovery device, in particular to a boiler tail gas heat recovery device.

Background technique

Boiler is a kind of energy conversion equipment. The energy input to the boiler is in the form of chemical energy in fuel, electric energy, heat energy of high-temperature flue gas, etc. After conversion by the boiler, it outputs steam, high-temperature water or organic heat carrier with certain heat energy. . Boilers are divided into hot water boilers, steam boilers, heat transfer oil boilers, etc. according to their functions. At present, steam boilers are widely used in industrial production, restaurants, large-scale living communities and other enterprises. When many enterprises use boilers, they usually discharge the hot exhaust gas from the boiler directly into the atmosphere after passing through the chimney. The temperature of the exhaust gas discharged from the steam boiler is quite high, usually between 200°C and 300°C, and it is directly discharged into the atmosphere. On the one hand, it will cause serious heat waste and low energy utilization; on the other hand, due to insufficient combustion or heating The fuel is coal and other reasons, so that the discharged hot exhaust gas contains SO2, NOX, smoke and other pollutants, causing serious pollution to the atmosphere and the environment. If the waste heat of the hot tail gas discharged from the boiler can be recovered and reused to provide hot water and heat source for production and life, it can not only improve the thermal efficiency of the whole system, save energy, but also treat the tail gas to reduce environmental pollution.

In the prior art, the Chinese invention patent with the authorized announcement number 101782274B discloses a heat recovery device for boiler exhaust gas, which consists of a tube box, a serpentine tube bundle, a serpentine tube bundle tube plate, a serpentine tube bundle threaded joint, and a hot water outlet header , cold water inlet header, long fins, positioning sleeve, screw rod, lifting screw, condensate discharge water seal, neutralization chamber and three-way valve. This kind of boiler waste heat recovery device is embedded between the boiler smoke outlet and the chimney pipe, and has obvious energy-saving effect. The idea of recovering and utilizing the waste heat of exhaust gas of this kind of boiler is: the heat exchange tube is filled with water, which exchanges heat with the hot exhaust gas in the flue, but the density of water is high and the quality is heavy. It is corrosive, easy to rust and cause equipment damage, and the structure of the whole waste heat device is relatively complicated and the cost is high.

Utility model content

In view of the above-mentioned deficiencies, the technical problem to be solved by this utility model is to provide a kind of recovery and utilization of the exhaust waste heat discharged from the boiler to provide hot water and heat source for production and life, which can not only improve the thermal efficiency of the boiler, achieve the purpose of saving energy, but also Reduce environmental pollution from boiler exhaust.

In order to solve the above problems, the utility model is realized through the following technical solutions:

A heat recovery device for boiler tail gas, comprising a water tank, the water tank is connected with a water inlet pipe and a water outlet pipe, and also includes a tail gas collection box, a tail gas discharge box and more than two hollow heat exchange tubes, and the tail gas collection box is installed in the water tank There is a filtering device on the outside and inside of one end, and the exhaust gas discharge box is installed outside the other end of the water tank. The tank is connected; the outlet pipe is divided into a first outlet pipe and a second outlet pipe, wherein the second outlet pipe is connected to the water inlet of the boiler through a water pump.

In the above scheme, since the exhaust gas discharged from the boiler is conveyed in the heat exchange tubes, in order to improve the heat exchange rate between the hot exhaust gas in the heat exchange tubes and the cold water in the water tank, the number of the heat exchange tubes should be reduced without increasing the cost. It can be 10 to 40, divided into n rows and m columns and evenly arranged in the water tank, wherein n and m are both positive integers.

In the above solution, the number of the heat exchange tubes is preferably 27, which are divided into 3 rows and 9 columns and evenly arranged in the water tank.

In the above solution, in order to further treat the soot particles or other pollutants contained in the boiler exhaust gas, a filter device is provided in the exhaust gas discharge box.

In the above solution, the filter device may be a filter screen, and the filter screen in the exhaust gas discharge box has a smaller aperture than the filter screen in the exhaust gas collection box.

In the above solution, in order to control the addition of cold water or the discharge of hot water in the water tank, a manual valve is provided on the water inlet pipe and the water outlet pipe.

In the above scheme, in order to improve the thermal conductivity and prevent the heat exchange tube from rusting and corroding due to long-term immersion in water, the heat exchange tube is preferably made of aluminum or iron coated with an anti-corrosion layer. material.

Compared with the prior art, the beneficial effects of the utility model are:

1. In the utility model, the heat exchange tube with the hot tail gas delivered inside is installed in the water tank with cold water inside, so as to realize the heat exchange between the hot tail gas and the cold water in the water tank. After the cold water in the water tank is heated into hot water, it can be Provide hot water for life, on the other hand, it can provide heat source for the boiler, which fully recovers and utilizes the waste heat of the boiler tail gas, improves the thermal efficiency of the boiler, and saves energy;

2. After the boiler exhaust gas in the heat exchange tube is treated by the filter device in the exhaust gas collection box and the exhaust gas discharge box, the pollutants such as SO2 and soot contained in the boiler exhaust gas are effectively reduced, and the pollution to the environment is reduced;

3. The boiler exhaust gas is transported in the heat exchange tube of the utility model, which is light in weight and can be installed at will according to the size of the water tank. The structure is simple, and the outer surface of the heat exchange tube is also coated with an anti-corrosion layer, which is not easy to be damaged.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the boiler exhaust heat recovery device.

The labels in the figure are: 1. Water tank; 2. Exhaust gas collection box; 3. Exhaust gas discharge box; 4. Heat exchange tube; 5. Water inlet pipe; 6. First water outlet pipe; 7. Second water outlet pipe; 8. Water pump; 9. Manual valve; 10. Filter screen.

detailed description

The utility model will be further explained below in conjunction with the accompanying drawings and specific embodiments, but it is not intended to limit the utility model.

As shown in Figure 1, a heat recovery device for boiler tail gas includes a water tank 1 connected to a water inlet pipe 5 and a water outlet pipe, and also includes an exhaust gas collection box 2, an exhaust gas discharge box 3 and more than two hollow air conditioners. The heat pipe 4, the exhaust gas collection box 2 is installed on the outside of one end of the water tank 1 and a filtering device is arranged inside it, so as to filter out pollutants such as soot, carbon particles, SO2 in the boiler exhaust gas. The exhaust gas discharge box 3 is installed outside the other end of the water tank 1, the heat exchange tube 4 is penetrated in the water tank 1, and one end of the heat exchange tube 5 is connected with the exhaust gas collection box 2, and the other end is connected with the exhaust gas discharge box 3; The water outlet pipe is divided into a first water outlet pipe 6 and a second water outlet pipe 7 , wherein the second water outlet pipe 7 is connected to the water inlet of the boiler through a water pump 8 . The first water outlet pipe 6 supplies hot water for domestic use, and the second water outlet pipe 7 delivers hot water to the boiler through a water pump 8 as a heating source for the steam generated by the boiler. Each is provided with a manual valve 9.

In the above solution, the heat exchange tube 4 is specifically made of aluminum or iron material coated with an anti-corrosion layer on the outer surface, and of course it can also be made of other metal materials capable of conducting heat. Wherein, the number of the heat exchange tubes 4 is 10-40, which are divided into n rows and m columns and evenly arranged in the water tank 1, wherein n and m are both positive integers. In this embodiment, the number of the heat exchange tubes 4 is specifically 27, which are divided into 3 rows and 9 columns and evenly arranged in the water tank. Of course, other values are also possible.

In order to play a double filtering role and make the exhausted boiler exhaust gas pollution-free, a filtering device is provided in the exhaust gas discharge box 3 . In this implementation, the filtering devices set in the exhaust gas collection box 2 and the exhaust gas discharge box 3 are filter screens 10, and the aperture of the filter screen 10 in the exhaust gas discharge box 3 is smaller than the aperture of the filter screen 10 in the exhaust gas collection box 2. Of course, the filtering device can also have other structures.

In order to improve the filtering effect of the filter device, an adsorption device can also be provided in the exhaust gas collection box 2 and the exhaust gas discharge box 3, so as to absorb harmful gases such as SO2 and NOX that are not easy to filter.

The above is only a preferred embodiment of the utility model, it should be pointed out that these examples are only used to illustrate the utility model without limiting the scope of the utility model, and, after reading the content of the utility model, this utility model Those skilled in the art can make various changes or modifications to the utility model, and these changes and improvements all fall within the scope defined by the claims of the utility model for protection.

Claims (7)

1. a heat energy recovering device for boiler tail gas, comprise water tank (1), described water tank (1) is connected with water inlet pipe (5) and outlet pipe, it is characterized in that: also comprise exhaust collection case (2), the hollow heat exchanger tube (4) of exhaust emissions case (3) and more than 2, described exhaust collection case (2) is installed on the outside of water tank (1) one end and inside is provided with a filter, exhaust emissions case (3) is installed on the outside of water tank (1) other end, described heat exchanger tube (4) is arranged in water tank (1), and one end of heat exchanger tube (4) is connected with exhaust collection case (2), its other end is connected with exhaust emissions case (3), described outlet pipe is divided into the first outlet pipe (6) and the second outlet pipe (7), and wherein the second outlet pipe (7) is connected with the water inlet of boiler by water pump (8).

2. heat energy recovering device for boiler tail gas according to claim 1, is characterized in that: the quantity of described heat exchanger tube (4) is 10 ~ 40, and be divided into the capable m row of n to be evenly located in water tank (1), wherein n and m is positive integer.

3. heat energy recovering device for boiler tail gas according to claim 1 and 2, is characterized in that: the quantity of described heat exchanger tube (4) is 27, and is divided into 3 row 9 to arrange evenly being located in water tank (1).

4. heat energy recovering device for boiler tail gas according to claim 1, is characterized in that: be provided with a filter in described exhaust emissions case (3).

5. the heat energy recovering device for boiler tail gas according to claim 1 or 4, it is characterized in that: described filter is screen pack (10), and the aperture of screen pack (10) in exhaust emissions case (3) is less than the aperture of the screen pack (10) in exhaust collection case (2).

6. heat energy recovering device for boiler tail gas according to claim 1, is characterized in that: described water inlet pipe (5) and outlet pipe are equipped with a hand-operated valve (9).

7. heat energy recovering device for boiler tail gas according to claim 1, is characterized in that: described heat exchanger tube (4) has the aluminium matter of anticorrosive coat or ferrous material to make by outer surface.