Gas-steam boiler

Abstract

The utility model discloses a gas-steam boiler, relates to the technical field of special equipment, and aims to solve the problem that heat energy waste is easily caused by direct emission of flue gas generated by combustion. According to the technical scheme, the boiler comprises a boiler body, the boiler body comprises a combustion chamber, a water inlet pipe, a water supply pipe and a smoke exhaust pipe, the combustion chamber is arranged in the center of the boiler body, a plurality of return smoke pipes are arranged between the combustion chamber and the smoke exhaust pipe, the water supply pipe is arranged in the return smoke pipes, and the water inlet pipe is connected with the water supply pipe; the side, away from the return smoke pipe, of the smoke exhaust pipe is fixedly connected with a tail gas treatment box. According to the utility model, the filtering device is arranged to carry out sedimentation treatment on discharged flue gas, so that the flue gas is prevented from polluting the external environment, and the heat energy of the flue gas can be recycled through the recycling device, so that the flue gas can be reused, the waste of residual heat energy in the flue gas is prevented, and the energy is saved.

Description

Technical Field

[0001] This utility model relates to the field of special equipment technology, and more specifically, to a gas-fired steam boiler. Background Technology

[0002] Gas-fired steam boilers are steam boilers that use gas combustion for heating. They are divided into vertical gas-fired steam boilers and horizontal gas-fired steam boilers. Vertical gas-fired steam boilers adopt a bottom-mounted burner and a two-pass structure, which ensures complete fuel combustion, stable boiler operation, and less space occupation. At the same time, baffles are inserted in the flue tubes to slow down the exhaust gas speed, increase heat exchange, and make the boiler thermal efficiency high.

[0003] Gas-fired steam boilers produce flue gas during the process of burning natural gas or coal gas to generate heat. This flue gas contains pollutants, and a filtration device is usually installed at the flue gas discharge point to treat the exhaust gas. The treated flue gas is then directly discharged into the air. The flue gas produced by combustion contains a large amount of heat energy, and direct discharge can easily lead to the waste of this heat energy. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a gas-fired steam boiler with the advantage of being able to reuse the residual heat energy in the flue gas.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a gas-fired steam boiler, including a boiler body, the boiler body including a combustion chamber, a water inlet pipe, a water supply pipe and a flue pipe, the combustion chamber being located at the center of the boiler body, a plurality of return flue pipes being provided between the combustion chamber and the flue pipe, the water supply pipe being located inside the return flue pipes, the water inlet pipe being connected to the water supply pipe, and a tail gas treatment box being fixedly connected to the side of the flue pipe away from the return flue pipes, the tail gas treatment box being provided with a filter device for filtering flue gas and a recovery device for recovering the heat energy of flue gas.

[0006] The present invention is further configured such that: the filtration device includes a first filter layer and a second filter layer, both of which are fixedly connected to the exhaust gas treatment box; the exhaust gas treatment box has an outlet; and a spray box is fixedly connected to the bottom of the exhaust gas treatment box, wherein a spray mechanism for settling flue gas is provided inside the spray box.

[0007] The present invention is further configured such that: both the first filter layer and the second filter layer have cavities, and activated carbon is fixedly connected in the cavities.

[0008] The present invention is further configured such that: the recycling device includes an extension tube and a through hole formed on the first filter layer and the second filter layer, the extension tube passes through the through hole, and the extension tube is connected to the water inlet pipe.

[0009] The present invention is further configured such that: the spraying mechanism includes a mesh plate and several nozzles; a water pump is fixedly connected to the outside of the spraying box; the nozzles are connected to the outlet of the water pump; an air inlet is provided on the top of the spraying box; and the mesh plate is fixedly connected to the air inlet.

[0010] The present invention is further configured such that: a plurality of baffles are fixedly connected inside the exhaust gas treatment box, and the plurality of baffles are arranged alternately.

[0011] The present invention is further configured such that an insulation layer is fixedly connected to the outside of the exhaust gas treatment box.

[0012] The present invention is further configured such that: the water supply pipe is spirally wound inside the return flue pipe, and the diameter of the water supply pipe is smaller than the diameter of the inlet pipe.

[0013] The present invention is further provided with a sealing ring at the connection between the extension pipe and the exhaust gas treatment box.

[0014] In summary, this utility model has the following beneficial effects:

[0015] After the water is heated, the flue gas enters the exhaust gas treatment box through the exhaust pipe. By setting up a filtration device, the exhaust gas can be treated to settle, preventing the flue gas from polluting the external environment. The heat energy of the flue gas can be recovered through the recovery device, so that it can be reused, preventing the waste of residual heat energy in the flue gas and saving energy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention.

[0018] In the diagram: 1. Boiler body; 2. Combustion chamber; 3. Water inlet pipe; 4. Water supply pipe; 5. Return flue pipe; 6. Exhaust gas treatment box; 7. First filter layer; 8. Second filter layer; 9. Air outlet; 10. Spray box; 11. Mesh plate; 12. Spray nozzle; 13. Air inlet; 14. Extension pipe; 15. Through hole; 16. Baffle; 17. Insulation layer; 18. Sealing ring. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0020] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Gas-fired steam boilers, such as Figures 1-2 As shown, the boiler includes a boiler body 1, which comprises a combustion chamber 2, an inlet pipe 3, a feed pipe 4, and an exhaust pipe. The combustion chamber 2 is located at the center of the boiler body 1. Several return flue pipes 5 are provided between the combustion chamber 2 and the exhaust pipe. There are two return flue pipes 5, which are wrapped around the outside of the combustion chamber 2 and are used to transport hot flue gas. The feed pipe 4 is located inside the return flue pipes 5, and the inlet pipe 3 is connected to the feed pipe 4. A tail gas treatment box 6 is fixedly connected to the side of the exhaust pipe away from the return flue pipes 5. The tail gas treatment box 6 is equipped with a filter device for filtering the flue gas and a recovery device for recovering the heat energy of the flue gas. After the flue gas is generated, it heats the feed pipe 4. After heating, the flue gas enters the tail gas treatment box 6 through the exhaust pipe. The filter device can settle the discharged flue gas to prevent it from polluting the external environment. The recovery device can recover the heat energy of the flue gas, which can be reused to prevent the waste of residual heat energy in the flue gas and save energy.

[0023] In one embodiment, the filtration device includes a first filter layer 7 and a second filter layer 8, both of which are fixedly connected to the exhaust gas treatment box 6. The exhaust gas treatment box 6 has an outlet 9, and a spray box 10 is fixedly connected to the bottom of the exhaust gas treatment box 6. The spray box 10 is equipped with a spray mechanism for settling flue gas. Both the first filter layer 7 and the second filter layer 8 have cavities, and activated carbon is fixedly connected in the cavities. After multiple layers of filtration, the activated carbon in the first filter layer 7 and the second filter layer 8 can settle pollutants in the flue gas, thereby reducing the pollutant content in the flue gas and reducing the pollution of the flue gas to the environment.

[0024] Furthermore, the spraying mechanism includes a mesh plate 11 and several nozzles 12. A water pump (not shown in the figure) is fixedly connected to the outside of the spray box 10. The nozzles 12 are connected to the water outlet of the water pump. An air inlet 13 is opened on the top of the spray box 10. The mesh plate 11 is fixedly connected to the air inlet 13. After the flue gas comes into contact with the mesh plate 11, it can be dispersed by the mesh holes of the mesh plate 11, so that the flue gas can spread out and increase the contact area between the flue gas and the water sprayed by the nozzles 12, so that the flue gas can be fully settled and absorbed, and the flue gas can be harmlessly treated.

[0025] like Figure 2 As shown, the recovery device includes an extension pipe 14 and through holes 15 formed on the first filter layer 7 and the second filter layer 8. The extension pipe 14 passes through the through holes 15 and is connected to the water inlet pipe 3. Several baffles 16 are fixedly connected inside the exhaust gas treatment box 6. The baffles 16 are arranged alternately. When the flue gas is discharged into the exhaust gas treatment box 6, its movement speed is relatively fast. After the flue gas comes into contact with the baffles 16, its movement speed can be reduced, thereby slowing down the movement speed of the flue gas and ensuring that the flue gas settles sufficiently. An insulation layer 17 is fixedly connected to the outside of the exhaust gas treatment box 6. The insulation layer 17 can protect the outside of the exhaust gas treatment box 6. The side is insulated to slow down the reduction of heat in the flue gas. Sealing rings 18 are provided at the connection between the extension pipe 14 and the tail gas treatment box 6 to reduce the gap at the connection between the extension pipe 14 and the tail gas treatment box 6 and prevent the flue gas from escaping. One end of the extension pipe 14 is connected to the external water source and the other end is connected to the water inlet pipe 3. There is still a lot of heat in the flue gas. During the process of the flue gas moving into the tail gas treatment box 6, the extension pipe 14 is extended into the tail gas treatment box 6 so that the water can be preheated by the flue gas before entering the boiler body 1, which improves the heating efficiency of the boiler body 1 and also reduces the waste of heat energy in the flue gas.

[0026] like Figure 2 As shown, the water supply pipe 4 is spirally wound inside the return flue pipe 5, and the diameter of the water supply pipe 4 is smaller than that of the water inlet pipe 3. This reduces the diameter of the water supply pipe 4, allowing the water in the water supply pipe 4 to heat up faster. At the same time, the water supply pipe 4 is spirally wound inside the return flue pipe 5, which lengthens the movement path of the water in the water supply pipe 4 and ensures the total amount of heated water in the water supply pipe 4.

[0027] Working principle:

[0028] When the flue gas needs to be discharged after the water has been heated, it can enter the exhaust gas treatment box 6 and be adsorbed and settled by the first filter layer 7 and the second filter layer 8. The extension pipe 14 passes through the middle of the first filter layer 7 and the second filter layer 8, so that the flue gas can come into contact with the extension pipe 14 during the settling process. This allows the residual heat in the flue gas to preheat the water in the extension pipe 14, saving the water heating time inside the boiler body 1. By reducing the diameter of the water supply pipe 4, the water in the water supply pipe 4 is heated faster. At the same time, the water supply pipe 4 is spirally wound in the return flue pipe 5, which lengthens the movement path of the water in the water supply pipe 4 and allows the water supply pipe 4 to come into full contact with the flue gas, thereby improving the heating efficiency of the boiler body 1.

[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A gas-fired steam boiler, comprising a boiler body (1), the boiler body (1) comprising a combustion chamber (2), a water inlet pipe (3), a water supply pipe (4), and a flue pipe, wherein the combustion chamber (2) is located at the center of the boiler body (1), characterized in that: A plurality of return flue pipes (5) are provided between the combustion chamber (2) and the exhaust pipe. The water supply pipe (4) is located inside the return flue pipe (5). The water inlet pipe (3) is connected to the water supply pipe (4). A tail gas treatment box (6) is fixedly connected to the side of the exhaust pipe away from the return flue pipe (5). The tail gas treatment box (6) is equipped with a filter device for filtering the flue gas and a recovery device for recovering the heat energy of the flue gas.

2. The gas-fired steam boiler according to claim 1, characterized in that: The filtration device includes a first filter layer (7) and a second filter layer (8). The first filter layer (7) and the second filter layer (8) are both fixedly connected inside the exhaust gas treatment box (6). An exhaust gas treatment box (6) is provided with an exhaust port (9). A spray box (10) is fixedly connected to the bottom of the exhaust gas treatment box (6). A spray mechanism for settling flue gas is provided inside the spray box (10).

3. The gas-fired steam boiler according to claim 2, characterized in that: Both the first filter layer (7) and the second filter layer (8) have cavities, and activated carbon is fixedly connected in the cavities.

4. The gas-fired steam boiler according to claim 2, characterized in that: The recycling device includes an extension tube (14) and a through hole (15) formed on the first filter layer (7) and the second filter layer (8). The extension tube (14) passes through the through hole (15) and is connected to the water inlet pipe (3).

5. The gas-fired steam boiler according to claim 2, characterized in that: The spraying mechanism includes a mesh plate (11) and several nozzles (12). A water pump is fixedly connected to the outside of the spray box (10). The nozzles (12) are connected to the outlet of the water pump. An air inlet (13) is opened on the top of the spray box (10). The mesh plate (11) is fixedly connected to the air inlet (13).

6. The gas-fired steam boiler according to claim 3, characterized in that: The exhaust gas treatment box (6) is fixedly connected with several baffles (16), and the baffles (16) are arranged alternately.

7. The gas-fired steam boiler according to claim 4, characterized in that: An insulation layer (17) is fixedly connected to the outside of the exhaust gas treatment box (6).

8. The gas-fired steam boiler according to claim 1, characterized in that: The water supply pipe (4) is spirally wound inside the return flue pipe (5), and the diameter of the water supply pipe (4) is smaller than the diameter of the inlet pipe (3).

9. The gas-fired steam boiler according to claim 4, characterized in that: A sealing ring (18) is provided at the connection between the extension pipe (14) and the exhaust gas treatment box (6).

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