A boiler flue gas waste heat recovery system

Abstract

The present invention relates to the technical field of flue gas waste heat recovery. The present invention provides a boiler flue gas waste heat recovery system, comprising: a first waste heat recovery mechanism, a boiler body smoke outlet is connected to the first waste heat recovery mechanism through a flue gas pipeline, a water supply mechanism is arranged on the right side of the first waste heat recovery mechanism, a bracket is fixedly installed on the top of the bottom plate, a second waste heat recovery mechanism is fixedly arranged on the top of the bracket, the first waste heat recovery mechanism is fixedly connected to the second waste heat recovery mechanism, the water supply mechanism is connected to both the first waste heat recovery mechanism and the second waste heat recovery mechanism, and the output end of the second waste heat recovery mechanism is fixedly connected to a discharge device; the present invention improves the utilization rate of boiler flue gas waste heat recovery through multiple waste heat recovery and multi-stage waste heat recovery methods, solves the problem of much waste heat waste in single flue gas waste heat recovery, and classifies and recovers flue gas waste heat of different temperatures, thereby improving recovery efficiency and reducing pollution.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas waste heat recovery, and in particular to a boiler flue gas waste heat recovery system. Background Art

[0002] Boilers are commonly used in industrial production processes. They heat water by burning fuel to produce high-temperature media such as steam to meet the heat energy required for production. However, during the operation of the boiler, the high temperature of the flue gas when it is released leads to a large amount of heat energy waste, which reduces the thermal efficiency of the system.

[0003] Existing flue gas waste heat recovery technologies mainly include flue gas heat exchangers, direct flue gas evaporation, and flue gas condensation recovery methods;

[0004] However, these methods have their own limitations. Traditional methods of recovering flue gas waste heat mostly use a single method, and do not classify the waste heat of flue gases at different temperatures for recovery. The flue gas heat exchanger needs to increase the complexity of the equipment and is prone to scaling problems, which affects the flue gas waste heat recovery effect. Direct evaporation of flue gas will cause pollutants in the flue gas to be released into the atmosphere, causing environmental pollution. Summary of the invention

[0005] The present invention provides a boiler flue gas waste heat recovery system to solve any one of the technical problems raised by the above background technology.

[0006] In order to solve the above technical problems, the present invention provides a boiler flue gas waste heat recovery system, comprising: a first waste heat recovery mechanism, the smoke outlet of the boiler body is connected to the first waste heat recovery mechanism through a flue gas pipe 1, a water supply mechanism is arranged on the right side of the first waste heat recovery mechanism, a bracket 1 is fixedly installed on the top of the bottom plate, a second waste heat recovery mechanism is fixedly arranged on the top of the bracket 1, the first waste heat recovery mechanism is fixedly connected to the second waste heat recovery mechanism, the water supply mechanism is connected to both the first waste heat recovery mechanism and the second waste heat recovery mechanism, and the output end of the second waste heat recovery mechanism is fixedly connected to a discharge device;

[0007] Preferably, the first waste heat recovery mechanism includes: a tank body 1, a vertical tank body 1 is provided on the right side of the boiler body, the bottom end of the tank body 1 is fixedly connected to the bottom plate, the bottom side wall of the tank body 1 is fixedly connected to the outlet end of the flue gas duct 1, the top inner wall of the tank body 1 is fixedly connected to a horizontal filter screen 1, a horizontal spray pipe is provided above the filter screen 1, the spray pipe passes through the right side wall of the tank body 1, the bottom of the tank body 1 is fixedly connected to a drain valve, and the top interface of the tank body 1 is fixedly connected to a flue gas duct 2.

[0008] Preferably, the tank body is fixedly connected to a vertical steam tank at the inner center, a plurality of vertical heat conduction plates are distributed on the surface of the steam tank, the heat conduction plates are fixedly connected to the outer wall of the steam tank, a vertical pipe is fixedly provided at the bottom center of the steam tank, the bottom of the vertical pipe penetrates downward through the bottom wall of the steam tank, the vertical pipe is fixedly connected to a plurality of horizontal pipes, and a plurality of atomizing nozzles are fixedly installed on each horizontal pipe.

[0009] Preferably, it also includes a power generation mechanism, which includes: bracket two, bracket two is provided on the right side of the tank body one, the top of the bracket two is fixedly connected to the generator and the drive box in sequence from bottom to top, the drive box is rotatably connected to the rotor, a number of power blades are distributed on the rotor, the generator input shaft is fixedly connected to the axial end of the rotor, the left end of the drive box is fixedly connected to a steam pipe one, the steam pipe one transversely penetrates the tank body one and is fixedly connected to the steam tank, an electric valve one is provided on the steam pipe one, the right end interface of the drive box is fixedly connected to the steam condenser through the steam pipe two, a pressure reducing valve is fixedly installed on the steam pipe two, and the bottom of the steam condenser is fixedly connected to a drain pipe.

[0010] Preferably, the second waste heat recovery mechanism includes: a heater box, a top end of the bracket is fixedly connected to the horizontal heater box, the bottom left side of the heater box is fixedly connected to the blower, the top right side of the heater box is fixedly connected to the heater duct, the outlet end of the heater duct is connected to the central air-conditioning duct, the inner center of the heater box is fixedly connected to the heat exchange box, the heat exchange box penetrates the heater box laterally, the air inlet at the right end of the heat exchange box is fixedly connected to two smoke outlets of the flue gas duct, the inner part of the heat exchange box is fixedly connected to the heat exchange pipe network, the right end of the heat exchange pipe network is connected to a water inlet pipe, the water inlet pipe penetrates the heat exchange box and the bottom wall of the heater box downward in sequence, the left end of the heat exchange pipe network is connected to the water outlet pipe, the water outlet pipe penetrates the heat exchange box and the top wall of the heater box upward in sequence and then is connected to the hot water storage tank.

[0011] Preferably, the water supply mechanism comprises: a water tank, a water tank is fixedly provided on the right side of the tank body, a water supply pump 1 and a water supply pump 2 are fixedly installed on the left and right sides of the top of the water tank respectively, the water supply pump 1 and the water supply pump 2 are fixedly connected with the water tank respectively, the water outlet of the water supply pump 1 is connected with the water inlet of a water supply pipe 1, the water supply pipe 1 transversely penetrates the left side wall of the tank body, the water outlet of the water supply pipe 1 is fixedly connected with the water inlet of a vertical pipe 1, the water supply pipe 1 is fixedly connected with the vertical pipe 2, the vertical pipe 2 is fixedly installed with an electromagnetic valve 1, the top of the vertical pipe 2 is fixedly connected with the spray pipe, and the water outlet of the water supply pump 2 is fixedly connected with the water inlet pipe through the water supply pipe 2.

[0012] Preferably, the emission device includes: a flue gas duct three and a flue gas filter, the flue gas outlet at the left end of the heat exchange box is fixedly connected to the flue gas duct three, the output end of the flue gas duct three is fixedly connected to the flue gas filter, and the flue gas filter is fixedly connected to the emission chimney through the flue gas duct four.

[0013] Preferably, an intelligent smoke control system is also provided, and the intelligent smoke control system includes:

[0014] Temperature detection module, used to detect the temperature of the heat conduction plate on the surface of the steam tank in real time;

[0015] A smoke temperature detection module, wherein a plurality of smoke detection units are distributed on the inner wall of the tank body, each smoke temperature detection module corresponds to a heat transfer plate, and the smoke detection unit is used to detect the smoke temperature of the contact area between the smoke in the tank body and the heat transfer plate of the steam tank in real time;

[0016] A smoke detection module is used to detect smoke characteristics at a smoke inlet of the tank, the smoke characteristics including smoke concentration and smoke flow rate;

[0017] The steam detection module is used to detect the water vapor parameters in the steam tank, and the water vapor parameters include: water vapor temperature and water vapor partial pressure value;

[0018] The smoke conveying unit is used to control the actual operating power value of the blower of the smoke duct 1 and change the flow rate of the smoke input into the tank 1;

[0019] The control system is electrically connected to the temperature detection module, the smoke temperature detection module, the smoke detection module, the steam detection module and the smoke delivery unit.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: a boiler flue gas waste heat recovery system provided by the present invention recovers and utilizes the boiler flue gas for multiple times through a first waste heat recovery mechanism, a second waste heat recovery mechanism, and a power generation mechanism, and improves the utilization rate of boiler flue gas waste heat recovery through a multi-stage waste heat recovery method, solves the problem of high waste heat waste in single flue gas waste heat recovery, and classifies the flue gas waste heat of different temperatures through the first waste heat recovery mechanism and the second waste heat recovery mechanism for recovery, thereby improving the recovery efficiency and reducing the pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a front view schematic diagram of a flue gas waste heat recovery system of the present invention;

[0023] Figure 2 is a front cross-sectional view of the first waste heat recovery mechanism of the present invention;

[0024] Figure 3 is a front cross-sectional view of the second waste heat recovery mechanism of the present invention;

[0025] Figure 4It is a front view of the power generation mechanism and water supply mechanism of the present invention.

[0026] Reference numerals:

[0027] 1. Boiler body; 2. Flue gas pipe 1; 3. First waste heat recovery mechanism; 4. Water supply mechanism; 5. Bracket 1; 6. Second waste heat recovery mechanism; 7. Discharge device; 8. Bottom plate; 9. Tank body 1; 10. Filter screen 1; 11. Spray pipe; 12. Drain valve; 13. Flue gas pipe 2; 14. Steam tank; 15. Heat conduction plate; 16. Vertical pipe 1; 17. Horizontal pipe; 18. Atomizing nozzle; 19. Bracket 2; 20. Generator; 21. Drive box; 22. Rotor; 23. Power blades; 24. Steam pipe 1; 25. Electric valve 1; 26 1. Steam pipe 2; 27. Pressure reducing valve; 28. Steam condenser; 2801. Drain pipe; 29. ​​Warm air box; 30. Blower; 31. Warm air duct; 32. Central air conditioner; 33. Heat exchange box; 34. Heat exchange pipe network; 35. Water inlet pipe; 36. Water outlet pipe; 37. Hot water storage tank; 38. Water storage tank; 39. Water supply pump 1; 40. Water supply pump 2; 41. Water supply pipe 1; 42. Vertical pipe 2; 43. Solenoid valve 1; 44. Water supply pipe 2; 45. Flue gas filter; 46. Flue gas duct 3; 47. Flue gas duct 4; 48. Emission chimney. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides the following embodiments

[0032] Example 1

[0033] The embodiment of the present invention provides a boiler flue gas waste heat recovery system, such as Figure 1 As shown, it includes: a boiler body 1, a boiler body 1 is fixedly provided on the left side of the top of the bottom plate 8, the smoke outlet of the boiler body 1 is connected to the first waste heat recovery mechanism 3 through a flue gas pipe 2, a water supply mechanism 4 is provided on the right side of the first waste heat recovery mechanism 3, a bracket 5 is fixedly installed on the top of the bottom plate 8, a second waste heat recovery mechanism 6 is fixedly provided on the top of the bracket 5, the first waste heat recovery mechanism 3 is fixedly connected to the second waste heat recovery mechanism 6, the water supply mechanism 4 is connected to both the first waste heat recovery mechanism 3 and the second waste heat recovery mechanism 6, the output end of the second waste heat recovery mechanism 6 is fixedly connected to the discharge device 7, and the flue gas pipe 2 is provided with an insulation layer.

[0034] The working principle and beneficial effects of the above technical solution are as follows: the present invention uniformly transports the high-temperature flue gas of the boiler body 1 to the first waste heat recovery mechanism 3 through the flue gas pipeline 1, and the water supply mechanism 4 supplies water to the first waste heat recovery mechanism 3. The interior of the first waste heat recovery mechanism 3 is heated by the high-temperature flue gas to vaporize the clean water to form high-pressure steam. The high-pressure steam converts thermal energy into kinetic energy. The high-pressure steam provides kinetic energy for the generator 20 to generate electricity. The flue gas temperature after passing through the first waste heat recovery mechanism 3 decreases and is transported to the second waste heat recovery mechanism 6. The second waste heat recovery mechanism 6 heats the circulating water provided by the water supply mechanism 4 through the heat exchange pipe network 34, and finally transports it to the hot water storage tank 37 for the residence. The residents take a shower and the heating network delivers warm air in the next step. At the same time, the second waste heat recovery mechanism 6 will use the blower 30 to perform a third waste heat recovery, forming warm air connected to the central air-conditioning 32 ventilation duct to provide heating for the residents. The present invention recovers the boiler flue gas for multiple times through the first waste heat recovery mechanism 3, the second waste heat recovery mechanism 6, and the generator 20. The utilization rate of boiler flue gas waste heat recovery is improved through the multi-stage waste heat recovery method, which solves the problem of much waste heat waste in single flue gas waste heat recovery. The flue gas waste heat of different temperatures is classified and recovered through the first waste heat recovery mechanism 3 and the second waste heat recovery mechanism 6, which improves the recovery efficiency and reduces pollution.

[0035] Example 2

[0036] On the basis of Example 1, Figure 1-Figure 3 As shown, the first waste heat recovery mechanism 3 includes: a tank body 9, a vertical tank body 9 is provided on the right side of the boiler body 1, the bottom end of the tank body 9 is fixedly connected to the bottom plate 8, the bottom side wall of the tank body 9 is fixedly connected to the outlet end of the flue gas pipe 2, the top inner wall of the tank body 9 is fixedly connected to the horizontal filter screen 10, a horizontal spray pipe 11 is provided above the filter screen 10, the spray pipe 11 passes through the right side wall of the tank body 9, the bottom of the tank body 9 is fixedly connected to the drain valve 12, and the top interface of the tank body 9 is fixedly connected to the flue gas pipe 2 13.

[0037] A vertical steam tank 14 is fixedly connected to the center of the tank body 9, and a plurality of vertical heat conducting plates 15 are distributed on the surface of the steam tank 14. The heat conducting plates 15 are fixedly connected to the outer wall of the steam tank 14. A vertical pipe 16 is fixedly provided at the center of the bottom of the steam tank 14. The bottom of the vertical pipe 16 penetrates downward through the bottom wall of the steam tank 14. The vertical pipe 16 is fixedly connected to a plurality of horizontal pipes 17, and a plurality of atomizing nozzles 18 are fixedly installed on each horizontal pipe 17.

[0038] The structure of the generator 20 includes: a bracket 19, a bracket 19 is arranged on the right side of the tank body 9, the top of the bracket 19 is fixedly connected to the generator 20 and the drive box 21 from bottom to top in sequence, the drive box 21 is rotatably connected to the rotor 22, a plurality of power blades 23 are distributed on the rotor 22, the input shaft of the generator 20 is fixedly connected to the axial end of the rotor 22, the left end of the drive box 21 is fixedly connected to the steam pipe 24, the steam pipe 24 horizontally penetrates the tank body 9 and is fixedly connected to the steam tank 14, an electric valve 25 is arranged on the steam pipe 24, the right end interface of the drive box 21 is fixedly connected to the steam condenser 28 through the steam pipe 26, a pressure reducing valve 27 is fixedly installed on the steam pipe 26, and the bottom of the steam condenser 28 is fixedly connected to the drain pipe 2801.

[0039] The working principle and beneficial effects of the above technical solution are as follows: when the first waste heat recovery mechanism 3 is working, the high-temperature flue gas is input into the tank body 9 through the flue gas pipe 2, and the flue gas moves upward from the bottom inside the tank body 9 and contacts a large number of heat conduction plates 15 on the surface of the steam tank 14. The heat conduction plates 15 are beneficial to expanding the contact area between the steam tank 14 and the high-temperature flue gas, increasing the increase and maintenance of the temperature of the steam tank 14, and accelerating the vaporization reaction of clean water. The clean water is transported to the inside of the vertical pipe 16 through the water supply mechanism 4, and then sprayed into the inside of the steam tank 14 through a number of horizontal pipes 17 and atomizing nozzles 18. Since the steam tank 14 is heated to a higher temperature by the high-temperature flue gas, the atomized clean water is instantly vaporized, and the steam causes the internal pressure of the steam tank 14 to increase. Then the electric valve 25 is opened, and the high-pressure steam flows through the driving box 21 through the steam pipe 24, and the high-pressure steam impacts the power blades 23 and the rotor 2 2 and the input shaft of the generator 20 rotate synchronously, the generator 20 then generates electricity, the high-pressure steam is reduced in pressure through the steam pipe 26 and the pressure reducing valve 27, and finally enters the steam condenser 28 to be cooled into secondary water, and the secondary water is re-transported to the water storage tank through the drain pipe 2801. The first waste heat recovery mechanism 3 also has a self-cleaning function. The solenoid valve 1 43 is opened, and the water in the vertical pipe 2 42 passes through the spray pipe 11 and is sprayed onto the surface of the filter and steam tank 14 to clean the dust left by the flue gas, and finally the sewage is discharged by opening the drain valve 12; the filter net of the first waste heat recovery mechanism 3 filters the flue gas to reduce the probability of dirt clogging the second waste heat recovery mechanism 6. The present invention efficiently utilizes the initial high temperature of the high-temperature flue gas, converts thermal energy into kinetic energy through the steam tank 14, and the kinetic energy is converted into electrical energy, and the steam condensate is effectively recovered for reuse, thereby reducing the cost.

[0040] Example 3

[0041] On the basis of Example 1, Figure 1-Figure 4As shown, the second waste heat recovery mechanism 6 includes: a warm air box 29, the top of the bracket 5 is fixedly connected to the horizontal warm air box 29, the bottom of the left side of the warm air box 29 is fixedly connected to the blower 30, the top of the right side of the warm air box 29 is fixedly connected to the warm air pipe 31, the outlet end of the warm air pipe 31 is connected to the central air conditioning 32 pipeline, the center of the warm air box 29 is fixedly connected to the heat exchange box 33, the heat exchange box 33 runs through the warm air box 29 horizontally, and the air inlet at the right end of the heat exchange box 33 is fixed. The smoke outlet of the flue gas duct 13 is connected, and the heat exchange pipe network 34 is fixedly connected inside the heat exchange box 33. The right end of the heat exchange pipe network 34 is connected to the water inlet pipe 35. The water inlet pipe 35 penetrates downward through the bottom wall of the heat exchange box 33 and the heater box 29 in sequence. The left end of the heat exchange pipe network 34 is connected to the water outlet pipe 36. The water outlet pipe 36 penetrates upward through the top wall of the heat exchange box 33 and the heater box 29 in sequence and then connects to the hot water storage tank 37. The heat exchange pipe network 34 is connected by finned tubes, which increases the contact area with the smoke.

[0042] The water supply mechanism 4 includes: a water tank 38, a water tank 38 is fixedly provided on the right side of the tank body 9, a water supply pump 1 39 and a water supply pump 2 40 are fixedly installed on the left and right sides of the top of the water tank 38, respectively, the water supply pump 1 39 and the water supply pump 2 40 are fixedly connected with the water tank 38 respectively, the water outlet of the water supply pump 1 39 is connected with the water inlet of a water supply pipe 1 41, the water supply pipe 1 41 runs horizontally through the left side wall of the tank body 9, the water outlet of the water supply pipe 1 41 is fixedly connected with the water inlet of a vertical pipe 16, the water supply pipe 1 41 is fixedly connected with a vertical pipe 2 42, the vertical pipe 2 42 is fixedly installed with an electromagnetic valve 1 43, the top of the vertical pipe 2 42 is fixedly connected with the spray pipe 11, and the water outlet of the water supply pump 2 40 is fixedly connected with the water inlet pipe 35 through the water supply pipe 2 44.

[0043] The emission device 7 includes: a flue gas pipe three 46 and a flue gas filter 45. The flue gas outlet at the left end of the heat exchange box 33 is fixedly connected to the flue gas pipe three 46. The output end of the flue gas pipe three 46 is fixedly connected to the flue gas filter 45. The flue gas filter 45 is fixedly connected to the emission chimney 48 through the flue gas pipe four 47.

[0044] The working principle and beneficial effects of the above technical solution are as follows: the water supply mechanism 4 works, the water supply pump 1 39 operates to deliver clean water to the vertical pipe 16 through the water supply pipe 1 41, and supplies water to the spray pipe 11 through the vertical pipe 2 42; the water supply pump 2 40 operates to deliver clean water to the water inlet pipe 35 of the heat exchange box 33 through the water supply pipe 2 44 and flows through the heat exchange pipe network 34;

[0045] When the second waste heat recovery mechanism 6 is working, the flue gas enters the heat exchange box 33 through the flue gas pipe 2 13, and the waste heat of the flue gas contacts the heat exchange pipe network 34. The heat exchange pipe network 34 is formed by connecting finned tubes, which increases the contact area with the flue gas and improves the heating rate of the clean water in the heat exchange pipe network 34. After the clean water flows through the heat exchange pipe network 34, it finally flows into the hot water storage tank 37 through the outlet pipe 36 for residents to bathe and heat. After passing through the heat exchange box 33, the flue gas is transported to the flue gas filter 45 through the flue gas pipe 3 46 for purification and filtration. After reaching the emission standard, it is finally discharged from the emission chimney 48;

[0046] At the same time, the blower 30 works to blow cold air into the warm air box 29. The cold air is heated by the waste heat on the surface of the heat exchange box 33 to form warm air. The warm air is transported to the central air-conditioning 32 pipeline through the warm air pipe 31 for indoor heating. The second waste heat mechanism utilizes the temperature of the flue gas waste heat in two stages by heating water and heating air, thereby improving the waste heat recovery rate of the flue gas.

[0047] Example 4

[0048] On the basis of embodiments 1-3, an intelligent flue gas control system is also provided, and the intelligent flue gas control system includes:

[0049] A temperature detection module, used for real-time detection of the temperature of the heat conducting plate 15 on the surface of the steam tank 14;

[0050] A smoke temperature detection module, wherein a plurality of smoke detection units are distributed on the inner wall of the tank body 1, each smoke temperature detection module corresponds to a heat conducting plate 15, and the smoke detection unit is used to detect the smoke temperature of the contact area between the smoke in the tank body 19 and the heat conducting plate 15 of the steam tank 14 in real time;

[0051] A smoke detection module is used to detect smoke characteristics at the smoke inlet of the tank body 9, and the smoke characteristics include smoke concentration and smoke flow rate;

[0052] The steam detection module is used to detect the water vapor parameters in the steam tank 14, and the water vapor parameters include: water vapor temperature and water vapor partial pressure value;

[0053] The smoke delivery unit is used to control the actual operating power value of the blower of the smoke duct 2 and change the flow rate of the smoke input into the tank 9;

[0054] A control system, wherein the control system is electrically connected to the temperature detection module, the smoke temperature detection module, the smoke detection module, the steam detection module and the smoke delivery unit respectively;

[0055] The intelligent flue gas control system also includes: a first evaluation module, which includes: a numbering sampling unit, a first calculation unit, and an early warning unit. The numbering unit is used to number the heat transfer plates 15 on the surface of the steam tank 14; the first calculation unit is used to calculate the flue gas heat conversion rate coefficient of each heat transfer plate 15 on the surface of the steam tank 14; the first early warning unit is used to issue an early warning when the heat conversion rate coefficient of any heat transfer plate 15 of the steam tank 14 is less than a first preset value, and the first early warning unit issues an early warning to remind the corresponding heat transfer plate 15 on the surface of the steam tank 14 to be repaired, cleaned or replaced;

[0056] ;

[0057] in: is the conversion rate coefficient of the jth heat conducting plate 15 between the heat of the flue gas in the tank 9 and the heat of the steam in the steam tank 14, N is the total number of the flue gas detection units of the flue gas temperature detection module, is the average value of the smoke temperature detected by the j-th smoke temperature detection module near the tank body 9 inlet during the detection period, is the average value of the smoke temperature detected by the j smoke temperature detection modules near the tank body 9 outlet during the detection period; is the average temperature value of the temperature detection module corresponding to the heat conducting plate 15 during the detection period; is the correction coefficient of the i-th feature of smoke detected by the smoke detection module within the detection time period (according to The value of is positive or negative), K is the number of smoke characteristics, is the actual average value of the i-th smoke feature detected by the smoke detection module during the detection time period, is the theoretical value of the i-th smoke feature detected by the smoke detection module within the detection time period.

[0058] The second calculation unit is used to calculate the water vapor diffusion coefficient in the steam tank 14 based on the first calculation unit when the first warning unit does not warn and the ratio of the average smoke temperature detected by the smoke temperature detection module near the outlet of the tank body 9 during the detection time period to the average smoke temperature detected by the smoke temperature detection module near the inlet of the tank body 9 during the detection time period is greater than or equal to the first preset value;

[0059] ;

[0060] in is the water vapor diffusion coefficient in the steam tank 14 during the detection period; is the gas molar mass of water vapor in the steam tank 14; is the correction coefficient of water vapor flow friction resistance; is the diameter of the droplets atomized by the atomizing nozzle 18; The steam detection module detects the partial pressure of water vapor near the inner wall of the steam tank 14, The steam detection module detects the water vapor partial pressure on the droplet surface; is the universal gas constant; is the water vapor flow inertia correction coefficient, is the mass change coefficient of the atomized droplet per unit time, is the temperature of the inner wall of the steam tank 14 away from the droplet surface; ln is the natural logarithm, e is the natural constant, is the circumference of a circle, is the flow resistance error adjustment coefficient, is the total number of heat conducting plates 15;

[0061] The comparison unit compares the water vapor diffusion coefficient in the steam tank 14 calculated by the second calculation unit with its threshold value. When the water vapor diffusion coefficient is greater than its threshold value, the control system controls the smoke conveying unit to reduce the power of the blower, reduce the flow rate of the smoke entering the tank body 9, and reduce the rate at which the waste heat of the smoke is converted into the thermal energy of water vapor. When the water vapor diffusion coefficient is less than its threshold value, the control system controls the smoke conveying unit to increase the power of the blower, and increase the rate at which the waste heat of the smoke is converted into the thermal energy of water vapor.

[0062] The working principle and beneficial effects of the above technical solution are as follows: the intelligent flue gas control system calculates the flue gas heat conversion rate coefficient of each steam tank 14 detection section through the first calculation unit of the first evaluation module, and uses it for judgment according to the first preset value. The early warning unit promptly issues an early warning to remind the corresponding steam tank 14 detection section heat transfer plate to be repaired, cleaned or replaced to avoid the occurrence of failures in the conversion of flue gas waste heat into steam thermal energy. The second calculation unit reflects the state of the conversion of flue gas waste heat into steam by calculating the water vapor diffusion coefficient in the steam tank 14. When the water vapor diffusion coefficient is less than its threshold value, the flue gas flow rate entering the tank body 9 is increased. When the water vapor diffusion coefficient is greater than its threshold value, the flue gas flow rate entering the tank body 9 is reduced, which is beneficial to controlling the stability of the flue gas waste heat conversion, reducing the waste of flue gas waste heat, and improving the heat conversion efficiency.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A boiler flue gas waste heat recovery system, characterized in that: include: A first waste heat recovery mechanism (3), a smoke outlet of the boiler body (1) is connected to the first waste heat recovery mechanism (3) through a smoke pipe (2), a water supply mechanism (4) is provided on the right side of the first waste heat recovery mechanism (3), a bracket (5) is fixedly installed on the top of the bottom plate (8), a second waste heat recovery mechanism (6) is fixedly provided on the top of the bracket (5), the first waste heat recovery mechanism (3) is fixedly connected to the second waste heat recovery mechanism (6), the water supply mechanism (4) is connected to both the first waste heat recovery mechanism (3) and the second waste heat recovery mechanism (6), and the output end of the second waste heat recovery mechanism (6) is fixedly connected to the discharge device (7); The first waste heat recovery mechanism (3) comprises: a tank body (9), a vertical tank body (9) is arranged on the right side of the boiler body (1), the bottom end of the tank body (9) is fixedly connected to the bottom plate (8), the bottom side wall of the tank body (9) is fixedly connected to the outlet end of the flue gas pipeline (2), the top inner wall of the tank body (9) is fixedly connected to a horizontal filter screen (10), a horizontal spray pipe (11) is arranged above the filter screen (10), the spray pipe (11) passes through the right side wall of the tank body (9), the bottom of the tank body (9) is fixedly connected to a drain valve (12), and the top interface of the tank body (9) is fixedly connected to a flue gas pipeline (13); The center of the tank body (9) is fixedly connected to a vertical steam tank (14), a plurality of vertical heat conduction plates (15) are distributed on the surface of the steam tank (14), the heat conduction plates (15) are fixedly connected to the outer wall of the steam tank (14), a vertical pipe (16) is fixedly provided at the center of the bottom of the steam tank (14), the bottom of the vertical pipe (16) penetrates downward through the bottom wall of the steam tank (14), the vertical pipe (16) is fixedly connected to a plurality of horizontal pipes (17), and a plurality of atomizing nozzles (18) are fixedly installed on each horizontal pipe (17).

2. A boiler flue gas waste heat recovery system according to claim 1, characterized in that: A power generation mechanism is also provided, which comprises: a bracket (19) 2, a bracket (19) 2 is provided on the right side of the tank body (9), the top of the bracket (19) 2 is fixedly connected to a generator (20) and a drive box (21) in sequence from bottom to top, the drive box (21) is rotatably connected to a rotor (22), a plurality of power blades (23) are distributed on the rotor (22), an input shaft of the generator (20) is fixedly connected to the axial end of the rotor (22), the left end of the drive box (21) is fixedly connected to a steam pipe (24), the steam pipe (24) horizontally penetrates the tank body (9) and is fixedly connected to the steam tank (14), an electric valve (25) is provided on the steam pipe (24), the right end interface of the drive box (21) is fixedly connected to a steam condenser (28) through a steam pipe (26), a pressure reducing valve (27) is fixedly installed on the steam pipe (26), and the bottom of the steam condenser (28) is fixedly connected to a drainage pipe (2801).

3. A boiler flue gas waste heat recovery system according to claim 1, characterized in that: The second waste heat recovery mechanism (6) comprises: a warm air box (29), the top of the bracket (5) is fixedly connected to the horizontal warm air box (29), the bottom of the left side of the warm air box (29) is fixedly connected to the blower (30), the top of the right side of the warm air box (29) is fixedly connected to the warm air pipe (31), the air outlet end of the warm air pipe (31) is connected to the central air conditioning (32) pipeline, the center of the inner part of the warm air box (29) is fixedly connected to the heat exchange box (33), the heat exchange box (33) passes through the warm air box (29) horizontally, The air inlet at the right end of the heat exchange box (33) is fixedly connected to the smoke outlet of the second smoke pipe (13); the interior of the heat exchange box (33) is fixedly connected to the heat exchange pipe network (34); the right end of the heat exchange pipe network (34) is connected to the water inlet pipe (35); the water inlet pipe (35) penetrates the bottom wall of the heat exchange box (33) and the warm air box (29) in sequence downwards; the left end of the heat exchange pipe network (34) is connected to the water outlet pipe (36); the water outlet pipe (36) penetrates the top wall of the heat exchange box (33) and the warm air box (29) in sequence upwards and is then connected to the hot water storage tank (37).

4. A boiler flue gas waste heat recovery system according to claim 1, characterized in that: The water supply mechanism (4) comprises: a water storage tank (38), the water storage tank (38) is fixedly provided on the right side of the tank body (9), a water supply pump (39) and a water supply pump (40) are respectively fixedly installed on the left and right sides of the top of the water storage tank (38), the water supply pump (39) and the water supply pump (40) are respectively fixedly connected to the water storage tank (38), the water outlet of the water supply pump (39) at the left end is connected to the water inlet of the water supply pipe (41), and the water supply pipe (41) is connected to the water supply pipe (41). (41) runs horizontally through the left side wall of the tank body (9), the water outlet of the water supply pipe (41) is fixedly connected to the water inlet of the vertical pipe (16), the water supply pipe (41) is fixedly connected to the vertical pipe (42), the vertical pipe (42) is fixedly installed with an electromagnetic valve (43), the top of the vertical pipe (42) is fixedly connected to the spray pipe (11), and the water outlet of the water supply pump (40) is fixedly connected to the water inlet pipe (35) through the water supply pipe (44).

5. The boiler flue gas waste heat recovery system according to claim 3, characterized in that: The emission device (7) comprises: a smoke pipe three (46) and a smoke filter (45); the smoke outlet at the left end of the heat exchange box (33) is fixedly connected to the smoke pipe three (46); the output end of the smoke pipe three (46) is fixedly connected to the smoke filter (45); and the smoke filter (45) is fixedly connected to the emission chimney (48) through the smoke pipe four (47).

6. The boiler flue gas waste heat recovery system according to claim 1, characterized in that: There is also an intelligent flue gas control system, which includes: A temperature detection module, used for detecting the temperature of a heat conducting plate (15) on the surface of a steam tank (14) in real time; A smoke temperature detection module, wherein a plurality of smoke detection units are distributed on the inner wall of the tank body, each smoke temperature detection module corresponds to a heat transfer plate (15), and the smoke detection unit is used to detect in real time the smoke temperature in the contact area between the smoke in the tank body (9) and the heat transfer plate (15) of the steam tank (14); A smoke detection module, used to detect smoke characteristics at a smoke inlet of the tank body (9), the smoke characteristics including smoke concentration and smoke flow rate; A steam detection module, used for detecting water vapor parameters in the steam tank (14), the water vapor parameters including: water vapor temperature and water vapor partial pressure value; A smoke conveying unit, used to control the actual operating power value of the blower of the smoke duct one (2) and change the flow rate of the smoke input into the tank one (9); The control system is electrically connected to the temperature detection module, the smoke temperature detection module, the smoke detection module, the steam detection module and the smoke delivery unit.

Images