Efficient waste heat recovery type calcining furnace steam water jacket heating unit

Abstract

The invention belongs to the technical field of industrial waste heat recovery and heating, and particularly relates to an efficient waste heat recovery type calcining furnace steam water jacket heating unit which comprises a base, the top face of the base is fixedly connected with a shell-and-tube heat exchanger, and a condensate water return pipe is installed at a steam condensate water side outlet of the shell-and-tube heat exchanger; a traditional independent heating boiler is replaced, energy conservation and emission reduction are achieved, standard coal consumption can be greatly reduced every year, carbon emission is reduced, the temperature fluctuation of heating circulating water of the whole device is controlled within + / -2 DEG C, energy conservation and emission reduction are achieved, energy conservation and emission reduction are achieved, and energy conservation and emission reduction are achieved. And meanwhile, the whole device does not need to additionally input fuel cost, heating can be achieved only through waste heat of the calcining furnace, compared with a traditional heating system, the operation cost is reduced by 80% or above, faults such as overpressure and water shortage are effectively prevented, and long-term stable operation of the system is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of industrial waste heat recovery and heating technology, and particularly relates to a high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnaces. Background Technology

[0002] Calcining furnaces generate a large amount of waste heat during production. In traditional processes, some of this heat is recovered through steam jackets to produce saturated steam. However, this low-quality steam is often used only for power generation and deaeration systems, or directly vented into the air, or used for heating baths in the plant area, resulting in low waste heat utilization. At the same time, existing plant heating relies heavily on independent heat sources such as coal-fired and gas-fired boilers, which not only increases energy consumption and carbon emissions but also leads to high operating costs and unstable heat supply.

[0003] Currently, the few technologies that combine the steam water jacket of the calcining furnace with the heating system generally suffer from defects such as low heat exchange efficiency between steam and circulating water, large fluctuations in heating water temperature, and a lack of effective pressure stabilization and safety protection mechanisms. Furthermore, they fail to achieve intelligent matching between steam supply and demand and heating load, resulting in poor system stability and difficulty in meeting the large-scale heating needs of the plant area. In view of this, we propose a high-efficiency waste heat recovery type calcining furnace steam water jacket heating unit. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnaces to solve the problems mentioned in the background art.

[0005] In view of this, the present invention provides a high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnaces, comprising: The base has a shell-and-tube heat exchanger fixedly connected to its top surface. The steam condensate side outlet of the shell-and-tube heat exchanger is equipped with a condensate return pipe and is connected to an external water tank through the condensate return pipe. The circulating water side outlet of the shell-and-tube heat exchanger is equipped with a first connecting pipe, and one end of the first connecting pipe is equipped with a plant heating water supply pipe. A steam water jacket is arranged around the outer wall of the calcining furnace. A water inlet valve and a drain valve are installed at the bottom of the steam water jacket. A second connecting pipe is fixedly connected to the steam outlet of the steam water jacket. One end of the second connecting pipe is connected to the steam side inlet pipe of the shell-and-tube heat exchanger.

[0006] This technical solution addresses the problems of waste heat and high energy consumption in traditional calcining furnaces, achieving energy recovery and reuse while meeting heating needs. It also reduces equipment corrosion and blockage, extends the service life of the steam water jacket, and ensures long-term stable operation of the system.

[0007] In the above technical solution, the shell-and-tube heat exchanger adopts a threaded tube heat exchange structure, and the first connecting pipe is equipped with a second steam regulating valve and two first steam regulating valves.

[0008] This technical solution improves waste heat transfer efficiency, enabling the heating circulating water to heat up quickly, shortening the heating start-up time, increasing heat utilization, and achieving flexible adaptation of heating temperature, thereby enhancing heating comfort.

[0009] Furthermore, the above technical solution also includes: The return water pipe is fixedly connected to the top surface of the base, and one end of the return water pipe is fixedly connected to the circulating water outlet of the shell-and-tube heat exchanger. Two circulating water pumps are installed on the return water pipe, and the outlet of the return water pipe is fixedly connected to the plant heating return water pipe.

[0010] This technical solution avoids localized heating dead zones, ensures uniform temperature across all areas of the plant, and improves system reliability.

[0011] Furthermore, the above technical solution also includes: A water supply tank is fixedly connected to the top surface of the base. Two pumps are fixedly connected to the outlet of the water supply tank. A water pipe is fixedly connected between the outlets of the two pumps, and one end of the water pipe is fixedly connected to the return water pipe. The inner cavity of the water pipe is connected to the inner cavity of the return water pipe. A water pipe is fixedly connected to one side of the water supply tank. A water supply valve is installed on the water pipe, and one end of the water pipe is connected to an external water source.

[0012] This technical solution avoids the decrease in heat exchange efficiency or equipment damage due to water shortage, and ensures timely and rapid water replenishment, adapting to different water loss scenarios and enhancing system adaptability.

[0013] In the above technical solution, a level gauge is fixedly connected to one side of the water replenishment tank, and the inner cavity of the level gauge is connected to the inner cavity of the water replenishment tank. A temperature sensor is installed inside the return water pipe.

[0014] This technical solution ensures that the heating temperature meets the standard while avoiding energy waste and improving the economic efficiency of system operation.

[0015] Furthermore, the above technical solution also includes: Several pressure gauges and several temperature gauges are respectively installed at key nodes on the second connecting pipe, the first connecting pipe and the return water pipe.

[0016] This technical solution facilitates operators in quickly troubleshooting, ensures safe system operation, and further improves heat utilization and heating stability.

[0017] In the above technical solution, a steam pressure sensor is installed in the steam water jacket and the second connecting pipe, and a liquid level sensor is installed in the steam water jacket. The steam pressure sensor in the steam water jacket and the second connecting pipe, the liquid level sensor in the steam water jacket, the two first steam regulating valves, the second steam regulating valve, the two circulating water pumps, and the temperature sensor in the return water pipe are connected to an externally installed PLC controller by wires.

[0018] In this technical solution, the steam pressure sensor in the steam jacket and the second connecting pipe, and the liquid level sensor in the steam jacket can collect steam pressure and liquid level data in real time. Automatic monitoring can be achieved by connecting to the PLC controller by wires, eliminating the need for real-time manual supervision and reducing labor costs. The PLC controller is linked with two first steam regulating valves, two second steam regulating valves, two circulating water pumps, and a temperature sensor in the return water pipe. It can automatically adjust the operation of the equipment according to the monitored parameters. For example, it can close the regulating valve when the pressure is too high and increase the power of the circulating water pump when the temperature is too low, so as to realize the intelligent operation of the system, improve the regulation accuracy and response speed, and reduce human operation errors.

[0019] In the above technical solution, furthermore, the inlets of the two pumps are connected to the inner cavity of the water replenishment tank, and the inner cavities of the two circulating water pumps are connected to the inner cavity of the return water pipe.

[0020] In this technical solution, the inlets of the two pumps are connected to the inner cavity of the water supply tank to ensure unobstructed water supply channels, avoid reduced water supply efficiency due to poor connection, and ensure stable and reliable water supply function.

[0021] The inner cavities of the two circulating water pumps are connected to the inner cavity of the return water pipe, ensuring stable power transmission of water circulation, avoiding problems such as water flow blockage and pressure fluctuations, reducing pipeline resistance and leakage risks, and improving the operating efficiency of the entire heating unit.

[0022] The beneficial effects of this invention are: 1. This high-efficiency waste heat recovery type calcining furnace steam water jacket heating unit, through the installation of a base, shell and tube heat exchanger, steam water jacket, inlet valve, drain valve, condensate return pipe, first connecting pipe, plant heating water supply pipe, water valve, first steam regulating valve, second steam regulating valve, water supply tank, level gauge, water pipe, water supply valve, water supply pipe, return water pipe, pump, safety valve, plant heating return water pipe and second connecting pipe, allows the entire unit to fully utilize the saturated steam of the calcining furnace steam water jacket as a heating heat source, replacing the traditional independent heating boiler, saving energy and reducing emissions, and significantly reducing standard coal consumption and carbon emissions annually.

[0023] 2. This high-efficiency waste heat recovery type calcining furnace steam water jacket heating unit, through the installation of a PLC controller, a steam pressure sensor in the steam water jacket and the second connecting pipe, a liquid level sensor in the steam water jacket and a temperature sensor in the return water pipe, controls the temperature fluctuation of the overall heating circulating water within ±2℃, meeting the stable heating needs of the plant area.

[0024] 3. This high-efficiency waste heat recovery type calciner steam water jacket heating unit, through the installation of shell and tube heat exchanger, steam water jacket, inlet valve, drain valve, condensate return pipe, first connecting pipe, plant heating water supply pipe, return pipe and plant heating return pipe, allows the whole unit to achieve heating without additional fuel costs, relying solely on the waste heat of the calciner. Compared with traditional heating systems, the operating cost is reduced by more than 80%.

[0025] 4. This high-efficiency waste heat recovery type calcining furnace steam water jacket heating unit is equipped with pressure gauges and temperature gauges, making the whole unit equipped with complete pressure and liquid level monitoring and safety protection devices, effectively preventing faults such as overpressure and water shortage, and ensuring long-term stable operation of the system. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure in this invention; Figure 3 This is a schematic diagram of the structure in this invention; Figure 4 This is a schematic diagram of the structure in this invention; Figure 5 This is a schematic diagram of the structure in this invention; Figure 6 This is a schematic diagram of the structure in this invention; Figure 7 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 8 This is a schematic diagram of the structure in this invention.

[0027] The markings in the diagram are as follows: 1. Base; 2. Shell and tube heat exchanger; 3. Steam jacket; 4. Inlet valve; 5. Drain valve; 6. Condensate return pipe; 7. First connecting pipe; 8. Plant heating water supply pipe; 9. Water valve; 10. First steam regulating valve; 11. Second steam regulating valve; 12. Makeup water tank; 13. Level gauge; 14. Water pipe; 15. Makeup water valve; 16. Water supply pipe; 17. Return water pipe; 18. Pump; 19. Safety valve; 20. Circulating water pump; 21. Plant heating return water pipe; 22. Pressure gauge; 23. Thermometer; 24. Second connecting pipe. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0029] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0030] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, without limiting the number of objects; for example, the first object can be one or several. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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 application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0032] It should be noted that, in this application, 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 that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0033] Example 1: Please see Figures 1-8 As shown, this embodiment provides a high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnaces, including: The base 1 has a shell-and-tube heat exchanger 2 fixedly connected to its top surface. The steam condensate side outlet of the shell-and-tube heat exchanger 2 is equipped with a condensate return pipe 6 and is connected to an external water tank through the condensate return pipe 6. The circulating water side outlet of the shell-and-tube heat exchanger 2 is equipped with a first connecting pipe 7 and a plant heating water supply pipe 8 is installed at one end of the first connecting pipe 7. A steam jacket 3 is arranged around the outer wall of the calcining furnace. A water inlet valve 4 and a drain valve 5 are installed at the bottom of the steam jacket 3. A second connecting pipe 24 is fixedly connected to the steam outlet of the steam jacket 3. One end of the second connecting pipe 24 is connected to the steam side inlet pipe of the shell-and-tube heat exchanger 2.

[0034] Among them, the steam water jacket 3 is arranged around the outer wall of the calcining furnace, which can directly capture the waste heat lost during the operation of the calcining furnace and convert it into steam. It is then transported to the shell-and-tube heat exchanger 2 through the second connecting pipe 24 to achieve efficient heat exchange between waste heat and heating circulating water, solve the problems of waste heat waste and high heating energy consumption in traditional calcining furnaces, and achieve energy recovery and reuse. The condensate return pipe 6 of the shell-and-tube heat exchanger 2 returns the condensate after heat exchange to the external water tank, avoiding water waste, reducing water replenishment costs, and improving the energy efficiency and environmental protection of the system; the first connecting pipe 7 is connected to the heating water supply pipe 8 in the plant area, which can quickly transport the hot water after heat exchange to the heating network in the plant area to meet the heating needs. The water inlet valve 4 at the bottom of the steam water jacket 3 can flexibly control the water supply flow to ensure a stable water level in the jacket; the drain valve 5 can promptly discharge impurities and scale deposited at the bottom, reducing equipment corrosion and blockage, extending the service life of the steam water jacket 3, and ensuring long-term stable operation of the system.

[0035] Example 2: This embodiment provides a high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnace. In addition to the technical solutions of the above embodiments, it also has the following technical features: the shell-and-tube heat exchanger 2 adopts a threaded tube heat exchange structure, and the first connecting pipe 7 is provided with a second steam regulating valve 11 and two first steam regulating valves 10.

[0036] Among them, the shell-and-tube heat exchanger 2 adopts a threaded tube heat exchange structure inside, which increases the heat exchange area and fluid turbulence compared with ordinary straight tubes, improves the waste heat transfer efficiency, enables the heating circulating water to heat up quickly, shortens the heating start-up time, and improves the heat utilization rate. The two first steam regulating valves 10 and one second steam regulating valve 11 on the first connecting pipe 7 can precisely adjust the steam flow and pressure according to different heating loads in the plant area, such as changes in ambient temperature and adjustments to the heating area, to avoid excess or insufficient heat, achieve flexible adaptation of heating temperature, and improve heating comfort.

[0037] Example 3: This embodiment provides a high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnaces. In addition to the technical solutions described in the above embodiments, it also has the following technical features: The return water pipe 17 is fixedly connected to the top surface of the base 1, and one end of the return water pipe 17 is fixedly connected to the circulating water outlet of the shell-and-tube heat exchanger 2. Two circulating water pumps 20 are installed on the return water pipe 17, and the outlet of the return water pipe 17 is fixedly connected to the plant heating return water pipe 21.

[0038] Among them, the return water pipe 17, the shell-and-tube heat exchanger 2, and the plant area heating return water pipe 21 form a closed-loop heating water circulation system, so that the heating water continuously circulates between the heat exchanger and the heating pipe network, avoiding local heating dead zones and ensuring that the temperature in all areas of the plant is uniform. The two circulating water pumps 20 on the return water pipe 17 provide sufficient power for water circulation, ensuring stable water flow speed and improving heat exchange efficiency; the dual-pump redundancy design ensures that if one pump fails, the other will continue to operate normally, avoiding heating interruption and improving system reliability.

[0039] Example 4: This embodiment provides a high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnaces. In addition to the technical solutions described in the above embodiments, it also has the following technical features: Water supply tank 12 is fixedly connected to the top surface of base 1. Two pumps 18 are fixedly connected to the outlet of water supply tank 12. A water pipe 16 is fixedly connected between the outlets of the two pumps 18, and one end of the water pipe 16 is fixedly connected to the return water pipe 17. The inner cavity of the water pipe 16 is connected to the inner cavity of the return water pipe 17. Water pipe 14 is fixedly connected to one side of water supply tank 12. Water supply valve 15 is installed on water pipe 14. One end of water pipe 14 is connected to an external water source.

[0040] The water supply tank 12 replenishes water to the return water pipe 17 through two pumps 18 and water pipe 16, which can promptly make up for the water loss caused by evaporation and leakage in the heating cycle, ensure the stability of the system water level, and avoid the decrease in heat exchange efficiency or equipment damage due to water shortage. The water pipe 14 on one side of the water tank 12 is connected to an external water source. With the help of the water supply valve 15, automatic or manual water supply can be achieved, which is convenient to operate. The dual pump design enhances the water supply power, ensures timely and rapid water supply, adapts to different water loss scenarios, and enhances the system's adaptability.

[0041] Example 5: This embodiment provides a high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnace. In addition to the technical solutions of the above embodiments, it also has the following technical features: a level gauge 13 is fixedly connected to one side of the water supply tank 12, and the inner cavity of the level gauge 13 is connected to the inner cavity of the water supply tank 12; a temperature sensor is installed in the return water pipe 17.

[0042] The level gauge 13 on one side of the water supply tank 12 is connected to the inner cavity of the water supply tank 12, which can display the water level in the tank in real time and intuitively. This allows operators to keep track of the water supply situation in a timely manner, avoid water shortage or overflow waste, and reduce the difficulty of manual inspection. The temperature sensor in the return water pipe 17 can monitor the return water temperature in real time, providing accurate data support for the adjustment of the steam regulating valve and the circulating water pump, ensuring that the heating temperature meets the standard, while avoiding energy waste and improving the economic efficiency of system operation.

[0043] Example 6: This embodiment provides a high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnaces. In addition to the technical solutions described in the above embodiments, it also has the following technical features: Several pressure gauges 22 and several temperature gauges 23 are respectively installed on key nodes of the second connecting pipe 24, the first connecting pipe 7 and the return water pipe 17.

[0044] Among them, several pressure gauges 22 are set at key nodes of the second connecting pipe 24, the first connecting pipe 7 and the return water pipe 17, which can monitor the steam pressure and pipeline water pressure in real time, detect abnormal pressure in time, such as excessive pressure causing pipeline leakage, and excessive pressure affecting heat exchange, so as to facilitate operators to quickly troubleshoot and ensure the safe operation of the system.

[0045] Several temperature gauges 23 monitor key parameters such as steam temperature, heating water supply temperature, and return water temperature to comprehensively understand the system's heat exchange status, provide a basis for parameter optimization and adjustment, and further improve heat utilization and heating stability.

[0046] Example 7: This embodiment provides a high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnace. In addition to the technical solutions of the above embodiments, it also has the following technical features: a steam pressure sensor is installed in the steam water jacket 3 and the second connecting pipe 24, a liquid level sensor is installed in the steam water jacket 3, and the steam pressure sensor, the liquid level sensor, the two first steam regulating valves 10, the second steam regulating valve 11, the two circulating water pumps 20 and the temperature sensor in the return water pipe 17 are connected to an externally installed PLC controller by wires.

[0047] Among them, the steam pressure sensor in the steam water jacket 3 and the liquid level sensor in the second connecting pipe 24 can collect steam pressure and water jacket liquid level data in real time. Automatic monitoring can be achieved by connecting to the PLC controller wires, eliminating the need for real-time manual supervision and reducing labor costs. The PLC controller is linked with the two first steam regulating valves 10, the second steam regulating valve 11, the two circulating water pumps 20, and the temperature sensor in the return water pipe 17. It can automatically adjust the operation of the equipment according to the monitored parameters. For example, it can close the regulating valve when the pressure is too high and increase the power of the circulating water pump when the temperature is too low, so as to realize the intelligent operation of the system, improve the regulation accuracy and response speed, and reduce human operation errors.

[0048] Example 8: This embodiment provides a high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnace. In addition to the technical solutions of the above embodiments, it also has the following technical features: the inlets of the two pumps 18 are connected to the inner cavity of the water supply tank 12, and the inner cavities of the two circulating water pumps 20 are connected to the inner cavity of the return water pipe 17.

[0049] The inlets of the two pumps 18 are connected to the inner cavity of the water supply tank 12 to ensure unobstructed water supply channels, avoid reduced water supply efficiency due to poor connection, and ensure stable and reliable water supply function.

[0050] The inner cavities of the two circulating water pumps 20 are connected to the inner cavity of the return water pipe 17, ensuring stable power transmission of water circulation, avoiding problems such as water flow blockage and pressure fluctuation, reducing pipeline resistance and leakage risk, and improving the operating efficiency of the entire heating unit.

[0051] Working principle: System Assembly The steam jacket 3 is fixed around the outer wall of the furnace chamber of the calcining furnace. Demineralized water is added into the steam jacket 3 through the water inlet valve 4. The second connecting pipe 24 is connected to the steam outlet at the top of the steam jacket 3. Then, one end of the second connecting pipe 24 is connected to the steam side inlet of the shell-and-tube heat exchanger 2. After that, the condensate side outlet of the shell-and-tube heat exchanger 2 is connected to the water tank through the condensate return pipe 6.

[0052] The circulating water inlet of the shell-and-tube heat exchanger 2 is connected to the first connecting pipe 7, and the first connecting pipe 7 is connected to the heating water supply pipe 8 of the plant area. Then, a return water pipe 17 is installed at the circulating water outlet of the shell-and-tube heat exchanger 2, and two circulating water pumps 20 and a temperature sensor are installed on the return water pipe 17. Then, the return water pipe 17 is connected to the heating return water pipe 21 of the plant area, so that the return water pipe 17 can be connected to the heating branch pipe network of each plant area.

[0053] Then, the externally configured PLC controller is electrically connected to the temperature sensor, pressure sensor, two circulating water pumps 20, two first steam regulating valves 10 and a second steam regulating valve 11 to complete the system integration.

[0054] System operation When the calcining furnace is running, the heat in the furnace chamber heats the demineralized water in the steam water jacket 3 to generate saturated steam at 0.8-1.2 MPa. After the steam is separated and impurities are removed from the steam drum, the steam enters the shell-and-tube heat exchanger 2 and exchanges heat with the low-temperature reflux circulating water from the plant area to heat the circulating water to 50-60℃.

[0055] Two circulating water pumps 20 distribute the heated high-temperature circulating water to each heating branch; the steam after heat exchange condenses into liquid water, which flows through the condensate return pipe 6 to the water tank, realizing the recycling of water resources.

[0056] The PLC controller adjusts the speed of the two circulating water pumps 20 and the opening of the two first steam regulating valves 10 and the second steam regulating valve 11 in real time based on the temperature feedback of the heating network: when the circulating water temperature is lower than the set value, the steam flow and the speed of the two circulating water pumps 20 are increased; when the temperature is higher than the set value, the steam flow and the speed of the two circulating water pumps 20 are decreased; when the circulating heating is short of water, the heating circulating water is automatically replenished according to the system pressure.

[0057] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnaces, characterized in that, include: The base (1) is fixedly connected to the top surface of the base (1) and the shell-and-tube heat exchanger (2) is installed with a condensate return pipe (6) at the steam condensate side outlet of the shell-and-tube heat exchanger (2) and connected to an external water tank through the condensate return pipe (6). The circulating water side outlet of the shell-and-tube heat exchanger (2) is installed with a first connecting pipe (7) and a plant heating water supply pipe (8) is installed at one end of the first connecting pipe (7). A steam water jacket (3) is arranged around the outer wall of the calcining furnace. A water inlet valve (4) and a drain valve (5) are installed at the bottom of the steam water jacket (3). A second connecting pipe (24) is fixedly connected to the steam outlet of the steam water jacket (3). One end of the second connecting pipe (24) is connected to the steam side inlet pipe of the shell-and-tube heat exchanger (2).

2. The high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnace according to claim 1, characterized in that, The shell-and-tube heat exchanger (2) has a threaded tube heat exchange structure inside, and the first connecting pipe (7) is equipped with a second steam regulating valve (11) and two first steam regulating valves (10).

3. The high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnace according to claim 1, characterized in that, Also includes: The return water pipe (17) is fixedly connected to the top surface of the base (1), and one end of the return water pipe (17) is fixedly connected to the circulating water outlet of the shell-and-tube heat exchanger (2). Two circulating water pumps (20) are installed on the return water pipe (17), and the outlet of the return water pipe (17) is fixedly connected to the plant heating return water pipe (21).

4. The high-efficiency waste heat recovery type steam water jacket heating unit for calcining furnace according to claim 1, characterized in that, Also includes: Water supply tank (12), the water supply tank (12) is fixedly connected to the top surface of the base (1), two pumps (18) are fixedly connected to the outlet of the water supply tank (12), a water pipe (16) is fixedly connected between the outlets of the two pumps (18), and one end of the water pipe (16) is fixedly connected to the return water pipe (17), and the inner cavity of the water pipe (16) is connected to the inner cavity of the return water pipe (17); Water pipe (14) is fixedly connected to one side of water supply tank (12). Water supply valve (15) is installed on water pipe (14). One end of water pipe (14) is connected to an external water source.

5. The high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnace according to claim 4, characterized in that, A level gauge (13) is fixedly connected to one side of the water supply tank (12), and the inner cavity of the level gauge (13) is connected to the inner cavity of the water supply tank (12). A temperature sensor is installed inside the return water pipe (17).

6. A high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnaces according to claims 1-5, characterized in that, Also includes: Several pressure gauges (22) and several temperature gauges (23) are respectively installed on key nodes of the second connecting pipe (24), the first connecting pipe (7) and the return water pipe (17).

7. A high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnaces according to claims 1-3, characterized in that, A steam pressure sensor is installed in the steam jacket (3) and the second connecting pipe (24), and a liquid level sensor is installed in the steam jacket (3). The steam pressure sensor in the steam jacket (3) and the second connecting pipe (24), the liquid level sensor in the steam jacket (3), the two first steam regulating valves (10), the second steam regulating valve (11), the two circulating water pumps (20), and the temperature sensor in the return water pipe (17) are connected to the PLC controller installed externally by wires.

8. A high-efficiency waste heat recovery type steam-water jacket heating unit for calcining furnace according to claims 3 and 4, characterized in that, The inlets of the two pumps (18) are connected to the inner cavity of the water supply tank (12), and the inner cavities of the two circulating water pumps (20) are connected to the inner cavity of the return water pipe (17).

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