A steam boiler waste heat recovery system

Abstract

The application provides a steam boiler waste heat recovery system, relates to the technical field of waste heat recovery, and comprises a plurality of steam boiler bodies arranged in series. A plurality of porous partitions and heat-conducting partitions are sequentially and spacedly arranged in the steam boiler bodies from top to bottom. The steam boiler bodies are sequentially divided into a steaming chamber, a steam chamber and a heating chamber from top to bottom by the porous partitions and the heat-conducting partitions. In two adjacent steam boiler bodies, the heating chamber of the former steam boiler body is communicated with the heating chamber of the latter steam boiler body through a first tail gas pipe, the first tail gas pipe is provided with a first tail gas filter, the heating chamber of the last steam boiler body is connected with a second tail gas filter through a second tail gas pipe, and the gas outlet of the second tail gas filter is connected with an exhaust pipe. The series connection of the steam boiler bodies and the tail gas communication structure can utilize the tail gas waste heat of the heating chamber of the former boiler to improve the recovery of the tail gas waste heat and reduce the fuel consumption cost.

Description

Technical Field

[0001] This application relates to the field of waste heat recovery technology, and more specifically, to a waste heat recovery system for a steam boiler. Background Technology

[0002] In the production of tea-based beverages, core processing steps such as tea leaf fixation and extraction of active ingredients require a continuous and dynamically changing demand for steam. Steam consumption fluctuates frequently depending on production batches and adjustments to process parameters. To meet this dynamic steam demand, the boilers in the existing steam supply system need to be frequently started and stopped.

[0003] However, after each boiler shutdown, the temperature inside the furnace drops sharply due to heat loss. When it is restarted, a large amount of fuel must be consumed to reheat the furnace in order to bring it back to the steam generation temperature required for processes such as tea fixing and extraction, which increases fuel costs. Summary of the Invention

[0004] The purpose of this application is to provide a waste heat recovery system for a steam boiler, which can solve the technical problems mentioned in the background art.

[0005] This application provides a waste heat recovery system for a steam boiler, including multiple steam boiler bodies arranged in series. Perforated baffles and heat-conducting baffles are arranged sequentially from top to bottom inside the steam boiler bodies. The perforated baffles and the heat-conducting baffles divide the interior of the steam boiler bodies into a steaming chamber, a steam chamber and a heating chamber from top to bottom.

[0006] In two adjacent steam boiler bodies, the heating chamber of the first steam boiler body is connected to the heating chamber of the second steam boiler body through a first tail gas pipe. A first tail gas filter is provided on the first tail gas pipe. The heating chamber of the last steam boiler body is connected to a second tail gas filter through a second tail gas pipe. An exhaust pipe is connected to the outlet of the second tail gas filter.

[0007] Furthermore, each steam boiler body's steaming chamber is connected to a corresponding cooling box via a steam exhaust pipe. Each steam exhaust pipe is equipped with a steam extraction pump. The end of the steam exhaust pipe away from the corresponding steam boiler body extends into the lower part of the cooling box connected to it, and is fixedly equipped with an exhaust screen.

[0008] Furthermore, the cooling tank is provided with a first water inlet pipe and a first water outlet pipe, and both the first water inlet pipe and the first water outlet pipe are provided with a first valve.

[0009] Furthermore, in two adjacent steam boiler bodies, the outlet of the first water outlet pipe of the preceding cooling box is connected to the steam chamber of the following steam boiler body.

[0010] Furthermore, the exhaust pipe penetrates the interior of one of the cooling boxes, and the section of the exhaust pipe inside the cooling box is spirally coiled.

[0011] Furthermore, the steam boiler body is provided with a second water inlet pipe and a second water outlet pipe that communicate with the steam chamber, and a second valve is provided on both the second water inlet pipe and the second water outlet pipe.

[0012] Furthermore, a water level gauge is installed on the outer wall of the steam boiler body, and the detection end of the water level gauge is connected to the steam chamber to visually display and monitor the real-time water level in the steam chamber.

[0013] Furthermore, the steam boiler body is equipped with a combustion gun, the flame-spraying end of the combustion gun extends into the heating chamber, a baffle plate is fixed in the heating chamber, the baffle plate is located on the flame path of the flame-spraying end of the combustion gun, and a gap is reserved between the top of the baffle plate and the bottom of the heat-conducting partition to form a flue.

[0014] The beneficial effects of this utility model are:

[0015] This invention utilizes a series-connected steam boiler body and exhaust gas communication structure to allow the waste heat from the exhaust gas of the heating chamber of the preceding steam boiler body to be utilized by the heating chamber of the following steam boiler body. When the following steam boiler is in standby mode, the waste heat from the exhaust gas of the heating chamber of the preceding steam boiler body enters the heating chamber of the following steam boiler body through the first exhaust gas pipe and the first exhaust gas filter to preheat the heating chamber of the following steam boiler body, thereby improving the recovery of waste heat from the exhaust gas and reducing fuel consumption costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the system structure in some embodiments of this application;

[0018] The reference numerals in the attached figures are as follows:

[0019] 1. Steam boiler body; 2. Perforated baffle; 3. Heat-conducting baffle; 4. Steaming chamber; 5. Steam chamber; 6. Heating chamber; 7. First tail gas pipe; 8. First tail gas filter; 9. Second tail gas pipe; 10. Second tail gas filter; 11. Exhaust pipe; 12. Steam exhaust pipe; 13. Cooling box; 14. Steam extraction pump; 15. Exhaust screen; 16. First water inlet pipe; 17. First water outlet pipe; 18. First valve; 19. Second water inlet pipe; 20. Second water outlet pipe; 21. Second valve; 22. Water level gauge; 23. Combustion gun; 24. Fire baffle. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific implementation examples:

[0027] like Figure 1 As shown, this application provides a steam boiler waste heat recovery system, including multiple steam boiler bodies 1 arranged in series. Perforated baffles 2 and heat-conducting baffles 3 are sequentially spaced from top to bottom inside each steam boiler body 1. The perforated baffles 2 and heat-conducting baffles 3 divide the interior of the steam boiler body 1 into a steaming chamber 4, a steam chamber 5, and a heating chamber 6 from top to bottom. The steaming chamber 4 is used for processing tea leaves. A sealed door communicating with the steaming chamber 4 is provided on one side of each steam boiler body 1, used to close or open the steaming chamber 4. In two adjacent steam boiler bodies 1, the heating chamber 6 of the preceding steam boiler body 1 is connected to the heating chamber 6 of the following steam boiler body 1 through a first exhaust pipe 7. A first exhaust filter 8 is provided on the first exhaust pipe 7. The heating chamber 6 of the last steam boiler body 1 is connected to a second exhaust filter 10 through a second exhaust pipe 9. The exhaust port of the exhaust filter 10 is connected to an exhaust pipe 11. Specifically, both the first exhaust filter 8 and the second exhaust filter 10 are existing technologies, and users can select the appropriate model according to their actual needs. The exhaust pipe 11 is used to connect to the exhaust gas treatment equipment, which treats the exhaust gas to meet emission standards before it is discharged. Through the series-arranged steam boiler bodies 1 and the exhaust gas connection structure, the waste heat of the exhaust gas in the heating chamber 6 of the previous steam boiler body 1 can be utilized by the heating chamber 6 of the next steam boiler body 1. When the next steam boiler is in standby mode, the waste heat of the exhaust gas in the heating chamber 6 of the previous steam boiler body 1 enters the heating chamber 6 of the next steam boiler body 1 through the first exhaust pipe 7 and the first exhaust filter 8 to preheat the heating chamber 6 of the next steam boiler body 1, thereby improving the recovery of waste heat from the exhaust gas and reducing fuel consumption costs.

[0028] like Figure 1As shown, each steam boiler body 1 has a steaming chamber 4 connected to a corresponding cooling box 13 via a steam exhaust pipe 12. Each steam exhaust pipe 12 is equipped with a steam extraction pump 14. The end of the steam exhaust pipe 12 away from the corresponding steam boiler body 1 extends into the lower part of the cooling box 13 connected to it, and is fixedly installed with an exhaust screen 15. Each steam boiler body 1's steaming chamber 4 forms a closed loop with the corresponding cooling box 13 through an independent steam exhaust pipe 12. The steam extraction pump 14 is connected to an external power source and started, so that the high-temperature steam in the steaming chamber 4 is transported to the lower part of the cooling box 13 through the steam exhaust pipe 12. The exhaust screen 15 disperses the concentrated exhaust gas into a fine airflow, so that the gas can fully contact the cooling medium in the cooling box 13, realizing steam condensation and recovery. Among them, the exhaust screen 15 enhances the heat exchange efficiency between the high-temperature steam and the cooling medium and improves the condensate recovery rate.

[0029] like Figure 1 As shown, the cooling tank 13 is provided with a first inlet pipe 16 and a first outlet pipe 17, and a first valve 18 is provided on both the first inlet pipe 16 and the first outlet pipe 17. The cooling tank 13 introduces the cooling medium through the first inlet pipe 16 and discharges the heat-exchanged medium through the first outlet pipe 17. The first valves 18 on the first inlet pipe 16 and the first outlet pipe 17 independently control the opening and closing of the corresponding pipes and the flow rate of the medium.

[0030] like Figure 1 As shown, in two adjacent steam boiler bodies 1, the outlet of the first water outlet pipe 17 of the first cooling box 13 is connected to the steam chamber 5 of the second steam boiler body 1. In the two adjacent steam boiler bodies 1, the medium with residual heat (such as condensate) discharged from the first cooling box 13 through the first water outlet pipe 17 can be directly transported to the steam chamber 5 of the second steam boiler body 1 through the pipeline according to actual needs. This residual heat medium is used as makeup water for the second steam chamber 5 to participate in the steam generation process, realizing the transfer of heat from the cooling box 13 to the subsequent steam boiler, reducing the energy consumption required for the second steam chamber 5 to heat cold water, and improving the overall heat utilization rate of the system.

[0031] like Figure 1 As shown, the exhaust pipe 11 passes through the interior of one of the cooling boxes 13, and the section of the exhaust pipe 11 located in the cooling box 13 is spirally coiled, so that when the high-temperature exhaust gas flows through this section of the exhaust pipe 11, it can fully contact the cooling medium in the cooling box 13 and exchange heat through the pipe wall, thereby realizing the recovery of the exhaust gas waste heat in the exhaust pipe 11.

[0032] like Figure 1As shown, the steam boiler body 1 is provided with a second water inlet pipe 19 and a second water outlet pipe 20 that are connected to the steam chamber 5. Both the second water inlet pipe 19 and the second water outlet pipe 20 are provided with a second valve 21. The steam boiler body 1 replenishes water to the steam chamber 5 through the second water inlet pipe 19 and discharges the water in the steam chamber 5 through the second water outlet pipe 20. The second valves 21 on the second water inlet pipe 19 and the second water outlet pipe 20 respectively control the opening and closing of the corresponding pipes and the flow rate.

[0033] like Figure 1 As shown, a water level gauge 22 is installed on the outer wall of the steam boiler body 1. The detection end of the water level gauge 22 is connected to the steam chamber 5 and is used to visually display and monitor the real-time water level in the steam chamber 5. The water level gauge 22 can visually display the real-time water level in the steam chamber 5, which makes it easy for operators to keep track of the water level. The water level can be adjusted according to the water level through the second valve 21 of the second inlet pipe 19 and the second valve 21 of the second outlet pipe 20 to avoid affecting the steam generation efficiency due to excessively high or low water levels.

[0034] like Figure 1 As shown, the steam boiler body 1 is equipped with a burner 23, the flame-spraying end of the burner 23 extends into the heating chamber 6, and a baffle plate 24 is fixedly installed in the heating chamber 6. The baffle plate 24 is located on the flame path of the flame-spraying end of the burner 23, and a gap is reserved between the top of the baffle plate 24 and the bottom of the heat-conducting baffle 3 to form a flue. The burner 23 has the function of mixing gas and air and has its own ignition device. Users can select the appropriate model of burner 23 according to actual needs. This is existing technology and will not be described in detail here. The burner 23 on the steam boiler body 1 sprays flames into the heating chamber 6 through the flame-spraying end to heat the heating chamber 6, and at the same time, the heat is transferred to the steam chamber 5 above through the heat-conducting baffle 3.

[0035] Working principle:

[0036] This steam boiler waste heat recovery system utilizes multiple steam boiler bodies 1 arranged in series to recover and utilize waste heat. Each boiler body is divided into a steaming chamber 4, a steam chamber 5, and a heating chamber 6 by a porous baffle 2 and a heat-conducting baffle 3. A burner 23 injects flames into the heating chamber 6 to generate heat, which is transferred to the steam chamber 5 through the heat-conducting baffle 3 to generate steam. The steam then passes through the porous baffle 2 into the steaming chamber 4 to process the tea. The exhaust gas from the heating chamber 6 of the previous boiler enters the heating chamber 6 of the next boiler through the first exhaust pipe 7 and the first exhaust filter 8, thus utilizing the waste heat. Finally, the exhaust gas passes through the second exhaust pipe 9 and the second exhaust filter 10, and is discharged through the exhaust pipe 11 to the exhaust gas treatment equipment for treatment, so that the exhaust gas meets the emission standards. After the exhaust gas is properly discharged, the exhaust pipe 11 passes through the cooling box 13 to recover the waste heat of the exhaust gas. The high-temperature steam from each steaming chamber 4 enters the corresponding cooling box 13 for condensation through the exhaust pipe 12, the extraction pump 14, and the exhaust screen 15. The cooling box 13 regulates the medium through the first water inlet pipe 16, the first water outlet pipe 17, and the first valve 18. The waste heat medium of the previous cooling box 13 is transported to the steam chamber 5 of the next boiler through the first water outlet pipe 17. The steam chamber 5 regulates the water volume through the second water inlet pipe 19, the second water outlet pipe 20, and the second valve 21. The water level gauge 22 monitors the water level in real time to assist in the regulation. The whole system forms a closed loop system of exhaust gas waste heat recovery, steam condensation and reuse, and heat transfer, realizing efficient and energy-saving operation.

[0037] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A waste heat recovery system for a steam boiler, characterized in that: The steam boiler body includes multiple steam boiler bodies arranged in series. The steam boiler body is provided with perforated baffles and heat-conducting baffles at intervals from top to bottom. The perforated baffles and the heat-conducting baffles divide the interior of the steam boiler body into a steaming chamber, a steam chamber and a heating chamber from top to bottom. In two adjacent steam boiler bodies, the heating chamber of the first steam boiler body is connected to the heating chamber of the second steam boiler body through a first tail gas pipe. A first tail gas filter is provided on the first tail gas pipe. The heating chamber of the last steam boiler body is connected to a second tail gas filter through a second tail gas pipe. An exhaust pipe is connected to the outlet of the second tail gas filter.

2. The waste heat recovery system for a steam boiler according to claim 1, characterized in that: Each steam boiler body has a steaming chamber connected to a cooling box via a steam exhaust pipe. Each steam exhaust pipe is equipped with a steam extraction pump. The end of the steam exhaust pipe away from the corresponding steam boiler body extends into the lower part of the cooling box connected to it and is fixedly equipped with an exhaust screen.

3. The waste heat recovery system for a steam boiler according to claim 2, characterized in that: The cooling tank is equipped with a first inlet pipe and a first outlet pipe, and each of the first inlet pipe and the first outlet pipe is equipped with a first valve.

4. The waste heat recovery system for a steam boiler according to claim 3, characterized in that: In two adjacent steam boiler bodies, the outlet of the first water outlet pipe of the preceding cooling box is connected to the steam chamber of the following steam boiler body.

5. A steam boiler waste heat recovery system according to claim 2, characterized in that: The exhaust pipe passes through the interior of one of the cooling boxes, and the section of the exhaust pipe inside the cooling box is spirally coiled.

6. The waste heat recovery system for a steam boiler according to claim 1, characterized in that: The steam boiler body is provided with a second water inlet pipe and a second water outlet pipe that are connected to the steam chamber. Both the second water inlet pipe and the second water outlet pipe are provided with a second valve.

7. A steam boiler waste heat recovery system according to claim 6, characterized in that: A water level gauge is installed on the outer wall of the steam boiler body. The detection end of the water level gauge is connected to the steam chamber and is used to visually display and monitor the real-time water level in the steam chamber.

8. A steam boiler waste heat recovery system according to claim 1, characterized in that: The steam boiler body is equipped with a combustion gun, the flame-spraying end of the combustion gun extends into the heating chamber, a baffle plate is fixed in the heating chamber, the baffle plate is located on the flame path of the flame-spraying end of the combustion gun, and a gap is reserved between the top of the baffle plate and the bottom of the heat-conducting baffle to form a flue.

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