Boiler flue gas purification and waste heat recovery device

Abstract

The utility model relates to the technical field of lithium bromide production, and discloses a boiler flue gas purification and waste heat recovery device which comprises a boiler, the surface of the boiler is communicated with an exhaust pipe, a heat exchange shell is fixed to the surface of the exhaust pipe, one side of the surface of the heat exchange shell is communicated with an air inlet cylinder, the other side of the surface of the heat exchange shell is communicated with an exhaust cylinder, and the exhaust cylinder is communicated with an exhaust pipe. A heat exchange mechanism is arranged on the surface of the heat exchange shell, an exhaust mechanism is arranged on the surface of the exhaust barrel, and a temperature device used for assisting the heat exchange mechanism is arranged in an inner cavity of the exhaust barrel. In daily use of the boiler, heat in the exhaust pipe can be absorbed under the action of the heat exchange mechanism, and the heat is discharged through the exhaust mechanism, so that the heat can act on drying equipment in the next step, and the effects of secondary utilization of the heat, energy conservation and emission reduction are achieved; and in addition, under the structural arrangement of the heat exchange mechanism and the exhaust mechanism, air becomes clean hot air after indirect heat exchange, and product pollution is avoided.

Description

Technical Field

[0001] This utility model relates to the field of lithium bromide production technology, specifically to a boiler flue gas purification and waste heat recovery device. Background Technology

[0002] Lithium bromide is an inorganic compound, a white cubic crystalline or granular powder, extremely soluble in water, soluble in ethanol and ether, slightly soluble in pyridine, and soluble in organic solvents such as methanol, acetone, and ethylene glycol. It is a highly efficient water vapor absorber and air humidity regulator. It can be used as an absorption refrigerant, a hydrogen chloride remover in organic chemistry, a fiber bulking agent, a hypnotic and sedative in medicine, and also in the photosensitive industry, as an analytical chemical reagent, and as an electrolyte in some high-energy batteries.

[0003] The production of lithium bromide requires the use of heat generated by a boiler as a heat source for the concentration and evaporation of the solution and the drying of the product. The flue gas generated by the boiler burning fuel carries a large amount of waste heat, with a temperature usually around 150–250°C. Furthermore, the lithium bromide evaporation and concentration process requires a large amount of heat energy to evaporate the moisture. In addition, the crystals obtained after crystallization may need to be further dried to remove surface moisture, which may also require heat energy. Directly emitting the flue gas would result in energy waste, increase production costs, and reduce production energy efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a boiler flue gas purification and waste heat recovery device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a boiler flue gas purification and waste heat recovery device, comprising a boiler, an exhaust pipe connected to the surface of the boiler, a heat exchange shell fixed to the surface of the exhaust pipe, an air inlet connected to one side of the surface of the heat exchange shell, an exhaust pipe connected to the other side of the surface of the heat exchange shell, a heat exchange mechanism provided on the surface of the heat exchange shell, an exhaust mechanism provided on the surface of the exhaust pipe, and a temperature sensor for assisting the heat exchange mechanism provided in the inner cavity of the exhaust pipe.

[0006] Preferably, the heat exchange mechanism includes a water pump fixed to the surface of the heat exchange shell, one end of the working end of the water pump is connected to a first heat exchange tube, the first heat exchange tube is disposed in the inner cavity of the exhaust pipe, and the other end of the working end of the water pump is connected to a second heat exchange tube, the second heat exchange tube is disposed in the inner cavity of the heat exchange shell.

[0007] Preferably, the surface of the second heat exchange tube is connected to a water injection pipe, and the other end of the water injection pipe is connected to the outside of the heat exchange shell.

[0008] Preferably, the first heat exchange tube is arranged in a ring shape inside the exhaust pipe, and the second heat exchange tube is arranged in a ring shape inside the heat exchange shell.

[0009] Preferably, the exhaust mechanism includes a return pipe connected to the surface of the exhaust pipe, an air supply fan disposed in the inner cavity of the air intake pipe, and a third solenoid valve disposed on the surface of the exhaust pipe. The other end of the return pipe is connected to the inner cavity of the air intake pipe. A first solenoid valve is disposed on one side of the surface of the return pipe, and a second solenoid valve is disposed on the other side of the surface of the return pipe.

[0010] Preferably, a support frame is fixed to one side of the surface of the air supply fan, and the other end of the support frame is fixed to the inner cavity of the air inlet cylinder.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] In the daily use of boilers, this utility model can absorb heat from the exhaust pipe through the heat exchange mechanism and discharge the heat through the exhaust mechanism, so that the heat can be used in the next drying equipment, achieving the effects of heat reuse, energy saving and emission reduction. Furthermore, the structure of the heat exchange mechanism and the exhaust mechanism can make the air clean hot air after indirect heat exchange, avoiding product contamination. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a three-dimensional structural diagram from another perspective of the present invention;

[0015] Figure 3 This is a partial three-dimensional structural diagram of the present invention;

[0016] Figure 4 This is a partial three-dimensional structural diagram of the present invention.

[0017] In the diagram: 1. Boiler; 2. Exhaust pipe; 3. Heat exchange shell; 4. Inlet cylinder; 5. Exhaust cylinder; 6. Heat exchange mechanism; 61. Water pump; 62. First heat exchange tube; 63. Second heat exchange tube; 7. Exhaust mechanism; 71. Return gas pipe; 72. First solenoid valve; 73. Air supply fan; 74. Second solenoid valve; 75. Third solenoid valve; 8. Temperature sensor; 9. Support frame; 10. Water injection pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 As shown, a boiler flue gas purification and waste heat recovery device includes a boiler 1, an exhaust pipe 2 connected to the surface of the boiler 1, the exhaust pipe 2 can discharge waste gas, a heat exchange shell 3 is fixed to the surface of the exhaust pipe 2, an air inlet 4 is connected to one side of the surface of the heat exchange shell 3, an exhaust pipe 5 is connected to the other side of the surface of the heat exchange shell 3, and a heat exchange mechanism 6 is provided on the surface of the heat exchange shell 3.

[0020] The heat exchange mechanism 6 includes a water pump 61 fixed to the surface of the heat exchange shell 3. One end of the water pump 61 is connected to a first heat exchange tube 62, which is located inside the exhaust pipe 2. The other end of the water pump 61 is connected to a second heat exchange tube 63, which is located inside the heat exchange shell 3. Under the action of the water pump 61, water flows in the first heat exchange tube 62 and the second heat exchange tube 63. When the water passes through the inner cavity of the exhaust pipe 2, it can absorb the heat of the flue gas inside the exhaust pipe 2. When the water passes through the second heat exchange tube 63, it can heat the air passing through the inner cavity of the heat exchange shell 3, thus achieving the effect of heat exchange.

[0021] An exhaust mechanism 7 is provided on the surface of the exhaust pipe 5. The exhaust mechanism 7 includes a return pipe 71 connected to the surface of the exhaust pipe 5, an air supply fan 73 disposed in the inner cavity of the air inlet 4, and a third solenoid valve 75 disposed on the surface of the exhaust pipe 5. The other end of the return pipe 71 is connected to the inner cavity of the air inlet 4. A first solenoid valve 72 is disposed on one side of the surface of the return pipe 71, and a second solenoid valve 74 is disposed on the other side of the surface of the return pipe 71. In this embodiment, through the arrangement of the return pipe 71, the first solenoid valve 72, the air supply fan 73, and the second solenoid valve 74, the exhaust pipe 5 and the air inlet 4 are connected under the action of the return pipe 71. Under the action of the first solenoid valve 72, the second solenoid valve 74, and the third solenoid valve 75, the air can be guided to operate in a specified direction. Under the action of the air supply fan 73, outside air can be sent into the heat exchange shell 3 through the air inlet 4.

[0022] The inner cavity of the exhaust stack 5 is equipped with a temperature sensor 8 for auxiliary heat exchange mechanism 6, and the operating threshold of the temperature sensor 8 is between 70° and 80°.

[0023] The surface of the second heat exchange tube 63 is connected to a water injection pipe 10, and the other end of the water injection pipe 10 is connected to the outside of the heat exchange shell 3. In this embodiment, the water injection pipe 10 facilitates the replacement or addition of water in the second heat exchange tube 63 and the first heat exchange tube 62 by the staff, thereby improving the practicality of the device.

[0024] The first heat exchange tube 62 is arranged in a ring shape inside the exhaust pipe 2, and the second heat exchange tube 63 is arranged in a ring shape inside the heat exchange shell 3. In this embodiment, this arrangement improves the heat absorption capacity of the first heat exchange tube 62 inside the exhaust pipe 2 and improves the heat release capacity of the second heat exchange tube 63 in the heat exchange shell 3.

[0025] The first heat exchange tube 62 and the second heat exchange tube 63 are both made of metals with good thermal conductivity.

[0026] A support frame 9 is fixed to one side of the surface of the air blower 73, and the other end of the support frame 9 is fixed to the inner cavity of the air inlet cylinder 4. In this embodiment, the support frame 9 provides support for the operation of the air blower 73 and improves the stability of the air blower 73 during operation.

[0027] Working Principle: During lithium bromide production, boiler 1 can burn fuel to generate steam or hot water, which serves as a heat source for solution concentration and evaporation and product drying. During boiler 1 operation, the exhaust gas contains a certain amount of heat. At this time, the operator can use water pump 61 to circulate water between the first heat exchange tube 62 and the second heat exchange tube 63. The first heat exchange tube 62 absorbs heat from the flue gas in the exhaust pipe 2 and transfers the heat to the heat exchange shell 3. Simultaneously, the air supply fan 73 operates, drawing outside air into the heat exchange shell 3 through the air inlet 4, and then through the second heat exchange tube 62. 3. The air is heated and, after passing through the temperature sensor 8, is discharged into the next drying equipment through the exhaust pipe 5. When the temperature sensor 8 detects an air temperature of 70°C, the third solenoid valve 75 is closed and the second solenoid valve 74 and the first solenoid valve 72 are opened under the control of the PLC control system. This causes the air to circulate in the return air pipe 71, thereby achieving the purpose of secondary heating of the air. After the air meets the standard, it is discharged to the outside through the exhaust pipe 5 to participate in the operation of the drying equipment for drying wet lithium bromide crystals. Furthermore, the structure of the heat exchange mechanism 6 and the exhaust mechanism 7 allows the air to become clean hot air after indirect heat exchange, avoiding product contamination.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A boiler flue gas purification and waste heat recovery device, comprising a boiler (1), characterized in that: The surface of the boiler (1) is connected to an exhaust pipe (2), and a heat exchange shell (3) is fixed on the surface of the exhaust pipe (2). An air inlet (4) is connected to one side of the surface of the heat exchange shell (3), and an exhaust pipe (5) is connected to the other side of the surface of the heat exchange shell (3). A heat exchange mechanism (6) is provided on the surface of the heat exchange shell (3), and an exhaust mechanism (7) is provided on the surface of the exhaust pipe (5). A thermometer (8) for assisting the heat exchange mechanism (6) is provided in the inner cavity of the exhaust pipe (5).

2. The boiler flue gas purification and waste heat recovery device according to claim 1, characterized in that: The heat exchange mechanism (6) includes a water pump (61) fixed to the surface of the heat exchange shell (3). One end of the working end of the water pump (61) is connected to a first heat exchange tube (62), which is located in the inner cavity of the exhaust pipe (2). The other end of the working end of the water pump (61) is connected to a second heat exchange tube (63), which is located in the inner cavity of the heat exchange shell (3).

3. The boiler flue gas purification and waste heat recovery device according to claim 2, characterized in that: The surface of the second heat exchange tube (63) is connected to a water injection pipe (10), and the other end of the water injection pipe (10) is connected to the outside of the heat exchange shell (3).

4. The boiler flue gas purification and waste heat recovery device according to claim 2, characterized in that: The first heat exchange tube (62) is arranged in a ring shape in the inner cavity of the exhaust pipe (2), and the second heat exchange tube (63) is arranged in a ring shape in the inner cavity of the heat exchange shell (3).

5. The boiler flue gas purification and waste heat recovery device according to claim 1, characterized in that: The exhaust mechanism (7) includes a return pipe (71) connected to the surface of the exhaust cylinder (5), an air supply fan (73) disposed in the inner cavity of the air inlet cylinder (4), and a third solenoid valve (75) disposed on the surface of the exhaust cylinder (5). The other end of the return pipe (71) is connected to the inner cavity of the air inlet cylinder (4). A first solenoid valve (72) is disposed on one side of the surface of the return pipe (71), and a second solenoid valve (74) is disposed on the other side of the surface of the return pipe (71).

6. The boiler flue gas purification and waste heat recovery device according to claim 5, characterized in that: A support frame (9) is fixed on one side of the surface of the air supply fan (73), and the other end of the support frame (9) is fixed to the inner cavity of the air inlet cylinder (4).

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