Heating device for boiler limestone desulfurization feeding

Abstract

The utility model provides a heating device for boiler limestone desulfurization feeding, which comprises an air blower and a heater connected with the air blower, the heater comprises a ventilator, an outer heating mechanism arranged on the outer side of the ventilator and an inner heating mechanism arranged in the ventilator, one end of the ventilator is provided with an air inlet pipe used for being connected with the air blower, and the other end of the ventilator is provided with an air outlet pipe used for being connected with the air blower. An air outlet pipe is arranged at the other end; the external heating mechanism comprises a heat preservation cover, the heat preservation cover is arranged on the outer side of the ventilation barrel in a sleeving mode, a circulation gap exists between the inner side wall of the heat preservation cover and the outer side wall of the ventilation barrel, a waste heat inlet pipe communicated with the circulation gap is arranged at one end of the heat preservation cover, and a discharge pipe communicated with the circulation gap is arranged at the other end of the heat preservation cover. The heating device for the limestone desulfurization feeding of the boiler has the advantages of being simple in structure, good in heating effect, high in reliability and easy to use and maintain, can be used for efficiently heating the limestone desulfurization feeding of the boiler, and is beneficial to improving the desulfurization effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler equipment, in particular to a heating device for boiler limestone desulfurization feeding. Background Art

[0002] With the fierce competition in the electricity market, the operating profit margins of power plants are shrinking. Power plants have gradually increased the use of inferior coal for blending. The sulfur content of coal entering the furnace has been increasing. When limestone is put into operation in the furnace and the wet method outside the furnace is put into operation at the same time, the environmental protection parameter emissions are no longer satisfactory to the requirements of the environmental protection department, and expansion and transformation are urgently needed.

[0003] An existing Chinese invention patent application with application number 201510791091.X discloses a lime powder flow measurement method and device suitable for lime powder dry desulfurization processes in power plants. The device heats the gas used to transport the lime powder, mixes the heated gas with the lime powder, and then exchanges heat between the two. The mass of lime powder per unit time is calculated using thermodynamic equilibrium formulas. The device comprises a Roots blower, a rotor flowmeter, an electric heater, a T-connector, a discharger, and a quartz tube. The quartz tube has several openings spaced along its length, each with a thermocouple inserted in it to measure the temperature of the air-powder mixture. However, this device relies on an electric heater to heat the airflow, resulting in limited heating efficiency, high power consumption, and high costs, which hinders energy conservation, environmental protection, and improved operating profits. Utility Model Content

[0004] In view of this, the utility model aims to provide a heating device for boiler limestone desulfurization feed, so as to solve the problems of poor heating effect and high power consumption of the existing boiler limestone desulfurization feed heating device.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A heating device for boiler limestone desulfurization feed includes a blower and a heater connected to the blower, the heater includes a ventilation tube, an external heating mechanism arranged on the outside of the ventilation tube, and an internal heating mechanism arranged in the ventilation tube, one end of the ventilation tube is provided with an air inlet pipe for connecting to the blower, and the other end is provided with an air outlet pipe; the external heating mechanism includes a thermal insulation cover, which is sleeved on the outside of the ventilation tube, and there is a circulation gap between the inner wall of the thermal insulation cover and the outer wall of the ventilation tube, one end of the thermal insulation cover is provided with a waste heat inlet pipe connected to the circulation gap, and the other end is provided with an exhaust pipe connected to the circulation gap; the waste heat inlet pipe is arranged on one side of the thermal insulation cover, and a heat-conducting fin is provided on the outside of the ventilation tube at a position corresponding to the circulation gap, and the heat-conducting fin is spirally arranged along the length direction of the ventilation tube.

[0007] Furthermore, a heat conductor is provided on the inner side of the ventilation duct, and a plurality of heat conductors are arranged at intervals along the circumference of the ventilation duct. The length direction of each heat conductor is the same as the length direction of the ventilation duct, and there is a ventilation gap between two adjacent heat conductors for connecting the air inlet pipe and the air outlet pipe.

[0008] Furthermore, at least three air inlet pipes are evenly arranged along the circumference of the ventilation tube, and each of the air inlet pipes is connected to the blower through an air separator.

[0009] Furthermore, the internal heating mechanism includes a heating liner arranged on the ventilation tube, and a heating element arranged in the heating liner. There is a accommodating gap between the outer wall of the heating liner and the inner wall of the ventilation tube, and the air inlet pipe and the air outlet pipe are connected through the accommodating gap.

[0010] Furthermore, the heating element is a U-shaped heating tube, and a junction box for installing the heating element is provided at one end of the heating liner facing the air inlet pipe, and the junction box is detachably mounted on the heating liner.

[0011] Furthermore, the blower adopts a Roots blower.

[0012] Furthermore, the waste heat inlet pipe is arranged on one end of the heat preservation cover facing the air inlet pipe, and the exhaust pipe is arranged on one end of the heat preservation cover facing the air outlet pipe.

[0013] Furthermore, the discharge pipe is arranged below the heat-insulating cover, and a recessed portion is provided on the heat-insulating cover at a position corresponding to the discharge pipe.

[0014] Furthermore, the heat-insulating cover can be detachably mounted on the ventilator.

[0015] Compared with the prior art, the heating device for boiler limestone desulfurization feed described in the present invention has the following advantages:

[0016] The utility model discloses a heating device for boiler limestone desulfurization feedstock, which has the advantages of simple structure, good heating effect, high reliability, and easy use and maintenance. It can be used for efficient heating of boiler limestone desulfurization feedstock, which is beneficial to improving the desulfurization effect. By arranging a heat preservation cover on the outside of the ventilation duct, the heat preservation cover can not only play a good heat preservation role for the ventilation duct, ensuring that the heat emitted by the internal heating mechanism can better heat the airflow, but also can connect the heat preservation cover to the waste heat source, and utilize the spiral flow of flue gas and other media in the heat preservation cover to achieve heating of the airflow in the ventilation duct, which is beneficial to reducing the operating power of the internal heating mechanism and increasing the temperature of the airflow passing through the ventilation duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 This is a structural schematic diagram of a heating device for boiler limestone desulfurization feed according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of a ventilation duct in a heating device for boiler limestone desulfurization feeding according to an embodiment of the present utility model.

[0020] Description of reference numerals:

[0021] 1. Blower; 2. Air distributor; 3. Air inlet pipe; 4. Ventilation duct; 5. Insulation cover; 6. Waste heat inlet pipe; 7. Heat transfer fins; 8. Recessed part; 9. Discharge pipe; 10. Heating tank; 11. Junction box; 12. Heating element; 13. Flow gap; 14. Heat transfer element; 15. Air outlet pipe. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0026] A heating device for boiler limestone desulfurization feed, such as Figure 1 and Figure 2 As shown, it includes a blower 1 and a heater connected to the blower 1, the heater includes a ventilation tube 4, an external heating mechanism arranged on the outside of the ventilation tube 4, and an internal heating mechanism arranged in the ventilation tube 4, one end of the ventilation tube 4 is provided with an air inlet pipe 3 for connecting to the blower 1, and the other end is provided with an air outlet pipe 15; the external heating mechanism includes a heat preservation cover 5, the heat preservation cover 5 is sleeved on the outside of the ventilation tube 4, and there is a circulation gap 13 between the inner wall of the heat preservation cover 5 and the outer wall of the ventilation tube 4, one end of the heat preservation cover 5 is provided with a waste heat inlet pipe 6 connected to the circulation gap 13, and the other end is provided with an exhaust pipe 9 connected to the circulation gap 13; the waste heat inlet pipe 6 is arranged on one side corresponding to the heat preservation cover 5, and a heat-conducting fin 7 is provided at a position corresponding to the circulation gap 13 on the outside of the ventilation tube 4, and the heat-conducting fin 7 is spirally arranged along the length direction of the ventilation tube 4.

[0027] For example, both the air inlet pipe 3 and the air outlet pipe 15 are fixed to the ventilation duct 4. In actual use, the air inlet pipe 3 can be connected to the air outlet end of the blower 1 via a flange, and the air outlet pipe 15 can be connected to a subsequent discharger. The waste heat inlet pipe 6 can be connected to the flue gas duct of the boiler or other waste heat source, and the exhaust pipe 9 can be connected to subsequent processing equipment to ensure the flow of flue gas or other media within the insulation cover 5. Those skilled in the art can adjust these settings according to actual needs, and will not be described in detail here.

[0028] By arranging a thermal insulation cover 5 on the outside of the ventilation duct 4, the thermal insulation cover 5 can not only play a good thermal insulation role for the ventilation duct 4, ensuring that the heat emitted by the internal heating mechanism can better heat the airflow, but also the thermal insulation cover 5 can be connected to the waste heat source, and the flue gas and other media can be used to spirally flow in the thermal insulation cover 5 to achieve heating of the airflow in the ventilation duct 4, which is beneficial to reduce the operating power of the internal heating mechanism and increase the temperature of the airflow passing through the ventilation duct 4, ensuring the subsequent desulfurization effect.

[0029] In actual application, the heat-conducting fins 7 are fixed to the ventilation duct 4. By setting the waste heat inlet pipe 6 on one side of the heat-insulating cover 5 and adopting spiral heat-conducting fins 7, the flue gas and other media entering through the waste heat inlet pipe 6 can flow in a spiral along the heat-conducting fins 7, increasing the flow length and flow time of the flue gas and other media, which is conducive to improving the utilization efficiency and utilization effect of the waste heat. At the same time, by adopting spiral heat-conducting fins 7, the contact area between the ventilation duct 4 and the flue gas and other media can be increased, and the conduction efficiency of the waste heat can be improved, so that the heat in the flue gas and other media can be quickly conducted to the ventilation duct 4, which is conducive to improving the heating speed and heating effect of the airflow in the ventilation duct 4. In addition, the internal heating mechanism and the external heating mechanism can also work together to achieve all-round heating of the airflow in the ventilation duct 4, which is conducive to further improving the heating effect of the airflow.

[0030] Preferably, a heat conducting member 14 is provided inside the ventilator 4. A plurality of heat conducting members 14 are spaced apart along the circumference of the ventilator 4. The length of each heat conducting member 14 is aligned with the length of the ventilator 4. A ventilation gap exists between two adjacent heat conducting members 14 for connecting the air inlet duct 3 and the air outlet duct 15. For example, three, four, or more heat conducting members 14 may be evenly arranged, and each heat conducting member 14 is fixed to the ventilator 4.

[0031] In actual use, the provision of heat conducting members 14 can also increase the contact area between the airflow in ventilator 4 and ventilator 4, thereby improving the efficiency of heat transfer from ventilator 4 to the airflow. Furthermore, by aligning the length of heat conducting members 14 with the length of ventilator 4 and providing a ventilation gap between adjacent heat conducting members 14, the deceleration effect of ventilator 4 on the airflow from blower 1 can be reduced, ensuring that the airflow can continue to flow rapidly and stably.

[0032] Preferably, at least three air inlet pipes 3 are evenly spaced along the circumference of the ventilation duct 4, each of which is connected to the blower 1 via an air splitter 2. For example, the air inlet pipe 3 and the air splitter 2 may also be connected via a flange. By providing multiple air inlet pipes 3 and connecting the blower 1 and the air inlet pipes 3 via the air splitter 2, the airflow blown by the blower 1 can be dispersed throughout the ventilation duct 4, facilitating efficient heating of the airflow by the internal and external heating mechanisms of the ventilation duct 4, further improving the heating effect and efficiency of the heating device.

[0033] Preferably, the internal heating mechanism includes a heating liner 10 disposed on the ventilator 4, and a heating element 12 disposed within the heating liner 10. A gap exists between the outer wall of the heating liner 10 and the inner wall of the ventilator 4 for accommodating the heat-conducting element 14, and the air inlet duct 3 and the air outlet duct 15 are connected via the gap. Exemplarily, the heating liner 10 is fixed to the ventilator 4, and the heating element 12 can be a U-shaped heating tube. A junction box 11 for mounting the heating element 12 is provided at one end of the heating liner 10 facing the air inlet duct 3, and the junction box 11 is detachably mounted on the heating liner 10.

[0034] In actual use, the junction box 11 can be fixed to the heating liner 10 by bolts. Multiple U-shaped heating tubes can be installed on the junction box 11. The installation and power supply methods of the U-shaped heating tubes are existing technologies and will not be described in detail here. By using the U-shaped heating tubes in conjunction with the heating liner 10, the airflow passing through the ventilator 4 can be heated from within the ventilator 4, which has the advantages of good heating effect and high heating efficiency.

[0035] Preferably, the blower 1 is a Roots blower. A Roots blower is a positive displacement blower with an impeller end face and front and rear end covers. It is a rotary compressor that utilizes two bladed rotors in relative motion within a cylinder to compress and transport gas. Compared to other types of blowers 1, this blower 1 has a simpler structure and is easier to manufacture, which helps improve the stability and reliability of the heating device during continuous operation.

[0036] Preferably, the waste heat inlet pipe 6 is arranged on the end of the thermal insulation cover 5 facing the air inlet pipe 3, and the exhaust pipe 9 is arranged on the end of the thermal insulation cover 5 facing the air outlet pipe 15. Exemplarily, the waste heat inlet pipe 6 and the exhaust pipe 9 are both fixed to the thermal insulation cover 5. By arranging the waste heat inlet pipe 6 on the end of the thermal insulation cover 5 facing the air inlet pipe 3 and the exhaust pipe 9 on the end of the thermal insulation cover 5 facing the air outlet pipe 15, the flow length of the flue gas or other medium can be increased, so that the flue gas or other medium entering the thermal insulation cover 5 through the waste heat inlet pipe 6 can better heat the airflow in the ventilation duct 4.

[0037] Optionally, a discharge pipe 9 is disposed below the heat-insulating cover 5, and a recessed portion 8 is provided on the heat-insulating cover 5 at a position corresponding to the discharge pipe 9. By disposing the discharge pipe 9 below the heat-insulating cover 5 and providing the recessed portion 8, it is easier for operators to subsequently clean the discharge pipe 9 and the interior of the heat-insulating cover 5. During cleaning, operators can clean the heat-insulating cover 5 and heat-conducting fins 7 by blowing a high-speed airflow or injecting a cleaning agent into the waste heat inlet pipe 6. The recessed portion 8 effectively collects smoke, dust, and sewage, thereby improving the cleaning effect of the heat-insulating cover 5 and heat-conducting fins 7.

[0038] Optionally, the thermal insulation cover 5 can be detachably mounted on the ventilation duct 4. For example, one end of the thermal insulation cover 5 can be connected to the ventilation duct 4 via a flange, and the other end is provided with a flange for connecting to the air outlet pipe 15, wherein the flange is fixed to the thermal insulation cover 5, and the flange and the air outlet pipe 15 can be connected by bolts, and an air hole is provided on the flange at a position corresponding to the air outlet pipe 15. By adopting a detachable thermal insulation cover 5, the operator can also effectively clean the thermal insulation cover 5 and the heat-conducting fins 7 by disassembling the thermal insulation cover 5, thereby reducing the difficulty of use and maintenance of the heating device. In addition, those skilled in the art can also choose other ways to install the thermal insulation cover 5 according to actual needs, so as to realize the detachable assembly of the thermal insulation cover 5 on the ventilation duct 4, which will not be repeated here.

[0039] In actual application, by cleaning the heat-insulating cover 5 and the heat-conducting fins 7 inside it, the heat-conducting performance of the heat-conducting fins 7 can be ensured, which is beneficial to improving the heating performance of the heating device during operation and reducing the difficulty of using and maintaining the heating device.

[0040] Because waste heat is energy that is not utilized in energy utilization equipment under certain economic and technical conditions, that is, redundant and discarded energy, waste heat recovery and utilization is an important way to improve economic efficiency and save fuel. During boiler operation, a large amount of high-temperature flue gas is generated. This heating device effectively utilizes the waste heat in the high-temperature flue gas, which helps reduce reliance on the internal heating mechanism. This allows the heating device to appropriately reduce the power of the internal heating mechanism during operation, achieving energy conservation, environmental protection, and reduced operating costs.

[0041] The utility model discloses a heating device for boiler limestone desulfurization feedstock, which has the advantages of simple structure, good heating effect, high reliability, and easy use and maintenance. It can be used for efficient heating of boiler limestone desulfurization feedstock, which is beneficial to improving the desulfurization effect. By arranging a heat preservation cover on the outside of the ventilation duct, the heat preservation cover can not only play a good heat preservation role for the ventilation duct, ensuring that the heat emitted by the internal heating mechanism can better heat the airflow, but also can connect the heat preservation cover to the waste heat source, and utilize the spiral flow of flue gas and other media in the heat preservation cover to achieve heating of the airflow in the ventilation duct, which is beneficial to reducing the operating power of the internal heating mechanism and increasing the temperature of the airflow passing through the ventilation duct.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heating device for boiler limestone desulfurization feed, characterized by: The invention comprises a blower (1) and a heater connected to the blower (1), wherein the heater comprises a ventilator (4), an external heating mechanism arranged outside the ventilator (4), and an internal heating mechanism arranged inside the ventilator (4); one end of the ventilator (4) is provided with an air inlet pipe (3) for connecting to the blower (1), and the other end is provided with an air outlet pipe (15); the external heating mechanism comprises a heat preservation cover (5), the heat preservation cover (5) is sleeved on the outside of the ventilator (4), and the inner side wall of the heat preservation cover (5) is in contact with the inner side wall of the heat preservation cover (5). There is a circulation gap (13) between the outer walls of the ventilation tube (4); one end of the heat-insulating cover (5) is provided with a waste heat inlet pipe (6) connected to the circulation gap (13); the other end is provided with a discharge pipe (9) connected to the circulation gap (13); the waste heat inlet pipe (6) is provided on one side of the heat-insulating cover (5); a heat-conducting fin (7) is provided on the outer side of the ventilation tube (4) at a position corresponding to the circulation gap (13); and the heat-conducting fin (7) is provided in a spiral shape along the length direction of the ventilation tube (4).

2. A heating device for boiler limestone desulfurization feed according to claim 1, characterized in that: A heat conducting member (14) is provided on the inner side of the ventilation tube (4), and a plurality of the heat conducting members (14) are arranged at intervals along the circumference of the ventilation tube (4). The length direction of each heat conducting member (14) is the same as the length direction of the ventilation tube (4), and a ventilation gap for connecting the air inlet pipe (3) and the air outlet pipe (15) exists between two adjacent heat conducting members (14).

3. A heating device for boiler limestone desulfurization feed according to claim 1 or 2, characterized in that: At least three air inlet pipes (3) are evenly arranged along the circumference of the ventilation cylinder (4), and each air inlet pipe (3) is connected to the blower (1) through an air distributor (2).

4. The heating device for boiler limestone desulfurization feed according to claim 1, characterized in that: The internal heating mechanism comprises a heating liner (10) provided on the ventilation tube (4), and a heating element (12) provided in the heating liner (10); an accommodation gap exists between the outer wall of the heating liner (10) and the inner wall of the ventilation tube (4); and the air inlet pipe (3) and the air outlet pipe (15) are connected via the accommodation gap.

5. A heating device for boiler limestone desulfurization feed according to claim 4, characterized in that: The heating element (12) is a U-shaped heating tube, and a junction box (11) for mounting the heating element (12) is provided at one end of the heating liner (10) facing the air inlet pipe (3), and the junction box (11) is detachably mounted on the heating liner (10).

6. The heating device for boiler limestone desulfurization feed according to claim 1, characterized in that: The blower (1) adopts a Roots blower.

7. The heating device for boiler limestone desulfurization feed according to claim 1, characterized in that: The waste heat inlet pipe (6) is arranged on one end of the heat preservation cover (5) facing the air inlet pipe (3), and the discharge pipe (9) is arranged on one end of the heat preservation cover (5) facing the air outlet pipe (15).

8. A heating device for boiler limestone desulfurization feed according to claim 1 or 7, characterized in that: The discharge pipe (9) is arranged below the heat-insulating cover (5), and a recessed portion (8) is provided on the heat-insulating cover (5) at a position corresponding to the discharge pipe (9).

9. A heating device for boiler limestone desulfurization feed according to claim 1 or 7, characterized in that: The heat-insulating cover (5) is detachably mounted on the ventilation tube (4).

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