Straight-flow type steam generation mechanism

Abstract

The utility model relates to a straight-flow type steam generating mechanism, which comprises a vaporization furnace body which comprises a pre-spraying section, a Venturi mixing section and an atomization spraying adjusting section which are sequentially arranged from front to back along the flowing direction of flue gas; the water inlet pipeline comprises three branches which are respectively connected with the pre-spraying section, the Venturi mixing section and the atomization spraying section, and is configured to respectively convey required raw material water to the pre-spraying section, the Venturi mixing section and the atomization spraying adjusting section; and the combustor is arranged at the front end of the gasification furnace body and is configured to generate high-temperature flue gas. Compared with the prior art, through the combined design of the pre-spraying section at the front end, the venturi mixing section in the middle and the atomization spraying adjusting section at the rear end, medium and low-quality steam required by a specific scene can be stably output with high heat efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of steam generator technology and relates to a direct-flow steam generating mechanism. Background Technology

[0002] A steam generator is a compact device that converts water into steam through a heating system, and it is widely used in industries such as industrial processing, food processing, and medical sterilization. Currently, the commonly used method for producing high-temperature steam is to use steam generators such as boilers with indirect heat exchange. This involves using heat exchangers to separate the high-temperature flue gas, which serves as the heat source, from the water source. The high-temperature flue gas exchanges heat with water / steam at the heat exchanger, achieving water vaporization and further heating to obtain high-temperature steam at the required temperature. This heating method can produce high-purity, stable-quality dry saturated steam or superheated steam. However, its heat exchange efficiency is relatively low due to factors such as the thermal resistance of the heat exchange tubes, scaling, and ash accumulation on the flue gas side. For example, the Chinese patent CN115451390A applied for by the utility model applicant provides a tube-type once-through condensing steam generator, which includes a steam furnace, a burner, and a feed water pump. This patent can improve the heating efficiency to a certain extent by adopting structures such as fins, fin plates, and finned tubes. However, due to the inherent limitations of indirect contact heating and flue gas heat loss, the overall thermal efficiency is low. Moreover, the entire heat exchange system has a complex structure and a large footprint, which also increases the initial investment and subsequent operating costs. The economic efficiency needs to be further improved.

[0003] It is evident that for specific scenarios where steam cleanliness requirements are not high and pressure sensitivity is not critical, the idea is to construct a device that directly contacts flue gas with water to generate the required medium-to-low quality steam. This would effectively avoid the defects of low thermal efficiency of the aforementioned indirect heat exchange steam generators while meeting the requirements. However, the process of generating steam by directly contacting high-temperature flue gas with water usually occurs in industries such as iron and steel metallurgy, chemical and petrochemical industries. The main purpose is to recover medium-to-low temperature waste heat. The high-temperature steam generated is generally output as a byproduct. Therefore, flue gas and water are mixed in a very rough manner to recover waste heat, which leads to the following problems: (1) Low thermal efficiency, with local water content and low steam content, and water not completely evaporated, forming a "wet wall" or "water curtain", increasing resistance. At the same time, it is difficult to obtain high-temperature steam; (2) The quality of the outlet steam is extremely unstable and is prone to damage to subsequent equipment (such as valves, pipes, heat exchangers, etc.) due to excessively high or uneven steam temperature.

[0004] Therefore, it is particularly important to improve the direct contact steam generation method to optimize steam quality and further improve thermal efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a direct-flow steam generator that can stably output medium-to-low quality steam required for specific scenarios with high thermal efficiency.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A direct-flow steam generator includes:

[0008] The gasification furnace body includes a pre-spray section, a Venturi mixing section and an atomizing spray regulating section arranged sequentially from front to back along the flue gas flow direction.

[0009] The water inlet pipe includes three branches, which are respectively connected to the pre-spray section, the Venturi mixing section and the atomizing spray section, and are configured to deliver the required raw water to the pre-spray section, the Venturi mixing section and the atomizing spray regulating section respectively.

[0010] And a burner, which is located at the front end (i.e., the inlet end) of the gasification furnace body and is configured to generate high-temperature flue gas.

[0011] Furthermore, the water inlet pipe includes a main pipe, which is in the shape of a serpentine coil and is arranged around the front end of the gasification furnace body and the pre-spray section. From the rear end of the main pipe, pre-spray branches, mixing branches, and atomizing spray branches are respectively led out to correspond to the pre-spray section, the Venturi mixing section, and the atomizing spray section. Each of the pre-spray branches, mixing branches, and atomizing spray branches is equipped with an independently controlled first regulating valve, a second regulating valve, and a third regulating valve.

[0012] Furthermore, a first temperature sensing element is provided at the inlet of the Venturi mixing section. During operation, the opening degree of the first regulating valve satisfies the condition that the temperature fed back by the first temperature sensing element is within a first preset temperature range.

[0013] Furthermore, a second temperature sensing element is provided at the outlet of the Venturi mixing section. During operation, the opening degree of the second regulating valve satisfies the condition that the temperature fed back by the second temperature sensing element is within a second preset temperature range.

[0014] Furthermore, a third temperature measuring element is provided at the rear end (i.e., the outlet end) of the vaporization furnace body. During operation, the temperature fed back by the third temperature measuring element is within a third preset temperature range.

[0015] Furthermore, the sidewall of the pre-spray section is provided with a plurality of first atomizing nozzles, which are arranged in a circle at equal intervals around the central axis of the pre-spray section, and the first atomizing nozzles are connected to a branch line branching off from the water inlet pipe.

[0016] Furthermore, the sidewall of the atomizing spray section is provided with a plurality of second atomizing nozzles, which are arranged in a circle at equal intervals around the central axis of the atomizing spray adjustment section, and the second atomizing nozzles are connected to a branch line branching off from the water inlet pipe.

[0017] Furthermore, the Venturi mixing section is a Venturi tube with an inlet at its throat, and the inlet is connected to a branch line branching off from the inlet pipe.

[0018] Compared with the prior art, this utility model constructs a combined pipeline consisting of a pre-spray section at the front end, a Venturi mixing section in the middle, and an atomizing spray regulating section at the rear end. The pre-spray section pre-cools the high-temperature flue gas to a relatively stable and suitable temperature range. Then, it is efficiently and strongly mixed with water in the Venturi mixing section. Finally, under the precise regulation of the atomizing spray regulating section, steam products at the required temperature are obtained. The entire steam production process is efficient and stable, with no flue gas heat loss and high thermal efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the steam generating mechanism;

[0020] Figure 2 This is a cross-sectional schematic diagram of the steam generating mechanism;

[0021] Explanation of markings in the diagram:

[0022] 1-Gasification furnace body, 11-Pre-spray section, 12-Venturi mixing section, 13-Atomizing spray adjustment section, 14-First atomizing nozzle, 15-Second atomizing nozzle, 16-First temperature measuring element, 17-Second temperature measuring element, 18-Third temperature measuring element;

[0023] 2-Inlet pipe, 21-Main pipe, 22-Pre-spray branch, 23-Mixing branch, 24-Atomizing spray branch, 25-First regulating valve, 26-Second regulating valve, 27-Third regulating valve;

[0024] 3-Burner. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0028] Unless otherwise specified, the functional components or structures in the following embodiments or examples are conventional components or structures used in the art to achieve the corresponding functions.

[0029] To provide a stable, high-efficiency output of medium-to-low quality steam for specific scenarios, this invention offers a direct-flow steam generator. Please refer to [link / reference]. Figure 1 and Figure 2 As shown, it includes:

[0030] The gasification furnace body 1 includes a pre-spray section 11, a Venturi mixing section 12 and an atomizing spray regulating section 13 arranged sequentially from front to back along the flue gas flow direction.

[0031] The water inlet pipe 2 includes three branches, which are respectively connected to the pre-spray section 11, the Venturi mixing section 12 and the atomizing spray section, and are configured to deliver the required raw water to the pre-spray section 11, the Venturi mixing section 12 and the atomizing spray regulating section 13 respectively.

[0032] And burner 3, which is located at the front end of the gasification furnace body 1 and is configured to generate high-temperature flue gas.

[0033] When the steam generating mechanism of this utility model is working, the high-temperature flue gas is pre-cooled to a stable and suitable temperature range by the pre-spray section 11, and then efficiently and intensifiedly mixed with water in the Venturi mixing section 12. Under the precise adjustment of the atomizing spray regulating section 13, the steam product at the required temperature is obtained, which can achieve a comprehensive balance between thermal efficiency, steam quality and production controllability.

[0034] For some specific implementation methods, please refer to [link / reference]. Figure 1 As shown, the water inlet pipe 2 includes a main pipe 21, which is coiled in a serpentine shape and arranged around the front end of the gasification furnace body 1 and the pre-spray section 11. From the rear end of the main pipe 21, it branches out into pre-spray branch 22, mixing branch 23, and atomizing spray branch 24, corresponding to the pre-spray section 11, the Venturi mixing section 12, and the atomizing spray section, respectively. Each of the pre-spray branch 22, mixing branch 23, and atomizing spray branch 24 is equipped with an independently controlled first regulating valve 25, a second regulating valve 26, and a third regulating valve 27. Here, the main pipe 21 is also connected to an external water supply device via a water inlet pipe. The three branches are controlled by three independent valves, thus achieving decoupling of control between the three sections. In addition, it should be noted that, in order to avoid the control influence between different branches, each of the three branches is equipped with an independent booster pump (optional setting), pressure stabilizing tank, etc. (not shown in the figure). These are all conventional settings in the field to eliminate the mutual influence between different parallel branches, and are not the innovative protection points of this utility model, so they will not be described in detail here.

[0035] In a more specific embodiment, a first temperature sensing element 16 is provided at the inlet of the Venturi mixing section 12. During operation, the opening of the first regulating valve 25 satisfies the following condition: the temperature fed back by the first temperature sensing element 16 is within a first preset temperature range. At this time, the temperature at the inlet is monitored in real time by the first temperature sensing element 16. When the temperature deviates from the first preset temperature range, the controller sends a corresponding execution signal to the first regulating valve 25 (which can be a solenoid valve) to control its valve opening, thereby controlling the amount of water sprayed in and thus regulating the temperature entering the Venturi mixing section 12. In addition, the first temperature sensing element 16 here can be a wear-resistant thermocouple commonly used in the art.

[0036] In a more specific embodiment, a second temperature sensing element 17 is also provided at the outlet of the Venturi mixing section 12. During operation, the opening degree of the second regulating valve 26 satisfies the condition that the temperature fed back by the second temperature sensing element 17 is within a second preset temperature range. At this time, the temperature at the outlet is monitored in real time by the second temperature sensing element 17. When the temperature deviates from the second preset temperature range, the controller sends a corresponding execution signal to the second regulating valve 26 (which can be a solenoid valve) to control its valve opening, thereby controlling the amount of water injected and thus regulating the airflow temperature at the outlet of the Venturi mixing section 12. Alternatively, the second temperature sensing element 17 can also be a thermocouple or a multi-point resistance temperature detector (RTD). Since the gas flow rate is high here, to improve the testing accuracy, multiple RTDs can be set in the vertical airflow direction, and the control can be performed by measuring the average temperature of the entire cross-section.

[0037] In a more specific embodiment, a third temperature sensing element 18 is also provided at the rear end of the vaporization furnace body 1. During operation, the temperature fed back by the third temperature sensing element 18 is within a third preset temperature range. At this time, the temperature at the rear end of the vaporization furnace body 1 is monitored in real time by the third temperature sensing element 18. When the temperature deviates from the third preset temperature range, the controller sends a corresponding execution signal to the third regulating valve 27 (which can be a solenoid valve) to control its valve opening, thereby controlling the amount of water injected and thus regulating the final output steam temperature. In addition, the third temperature sensing element 18 here is the same as the first temperature sensing element 16, and can be a wear-resistant thermocouple commonly used in the art.

[0038] In some specific embodiments, the sidewall of the pre-spray section 11 is provided with a plurality of first atomizing nozzles 14, which are arranged in a circle at equal intervals around the central axis of the pre-spray section 11, and the first atomizing nozzles 14 are connected to a branch line branching off from the water inlet pipe 2.

[0039] In some specific embodiments, the sidewall of the atomizing spray section is provided with a plurality of second atomizing nozzles 15, which are arranged in a circle at equal intervals around the central axis of the atomizing spray adjustment section 13, and the second atomizing nozzles 15 are connected to a branch line branching off from the water inlet pipe 2.

[0040] In some specific embodiments, the Venturi mixing section 12 is a Venturi tube with an inlet at its throat, and the inlet is connected to a branch line branching off from the inlet pipe 2.

[0041] Each of the above implementation methods can be implemented individually, or in any combination of two or more without violating logic.

[0042] The above implementation methods will be described in more detail below with reference to specific embodiments.

[0043] Example 1:

[0044] To provide a stable, high-efficiency output of medium-to-low quality steam for specific scenarios, this invention offers a direct-flow steam generator. Please refer to [link / reference]. Figure 1 As shown, including:

[0045] The gasification furnace body 1 includes a pre-spray section 11, a Venturi mixing section 12 and an atomizing spray regulating section 13 arranged sequentially from front to back along the flue gas flow direction.

[0046] The water inlet pipe 2 includes three branches, which are respectively connected to the pre-spray section 11, the Venturi mixing section 12 and the atomizing spray section, and are configured to deliver the required raw water to the pre-spray section 11, the Venturi mixing section 12 and the atomizing spray regulating section 13 respectively.

[0047] And burner 3, which is located at the front end of the gasification furnace body 1 and is configured to generate high-temperature flue gas.

[0048] Please see again. Figure 1 As shown, the water inlet pipe 2 includes a main pipe 21, which is coiled in a serpentine shape and arranged around the front end of the gasification furnace body 1 and the pre-spray section 11. From the rear end of the main pipe 21, it branches out into pre-spray branch 22, mixing branch 23, and atomizing spray branch 24, corresponding to the pre-spray section 11, the Venturi mixing section 12, and the atomizing spray section, respectively. Each of the pre-spray branch 22, mixing branch 23, and atomizing spray branch 24 is equipped with an independently controlled first regulating valve 25, a second regulating valve 26, and a third regulating valve 27. Here, the main pipe 21 is also connected to an external water supply device via a water inlet pipe. The three branches are controlled by three independent valves, thus achieving decoupling of control between the three sections. In addition, it should be noted that, in order to avoid the control influence between different branches, each of the three branches is equipped with an independent booster pump, pressure stabilizing tank, etc. (not shown in the figure). These are all conventional settings in the field to eliminate the mutual influence between different parallel branches, and are not innovative protection points of this utility model, so they will not be described in detail here.

[0049] A first temperature sensing element 16 is provided at the inlet of the Venturi mixing section 12. During operation, the opening degree of the first regulating valve 25 satisfies the condition that the temperature fed back by the first temperature sensing element 16 is within a first preset temperature range. At this time, the temperature at the inlet is monitored in real time by the first temperature sensing element 16. When the temperature deviates from the first preset temperature range, the controller sends a corresponding execution signal to the first regulating valve 25 (which can be a solenoid valve) to control its valve opening degree, thereby controlling the amount of water sprayed in and thus regulating the temperature entering the Venturi mixing section 12. In addition, the first temperature sensing element 16 here can be a wear-resistant thermocouple commonly used in the art.

[0050] A second temperature sensing element 17 is also provided at the outlet of the Venturi mixing section 12. During operation, the opening degree of the second regulating valve 26 satisfies the condition that the temperature fed back by the second temperature sensing element 17 is within a second preset temperature range. At this time, the temperature at the outlet is monitored in real time by the second temperature sensing element 17. When the temperature deviates from the second preset temperature range, the controller sends a corresponding execution signal to the second regulating valve 26 (which can be a solenoid valve) to control its valve opening, thereby controlling the amount of water injected and thus regulating the airflow temperature at the outlet of the Venturi mixing section 12. Alternatively, the second temperature sensing element 17 can also be a thermocouple or a multi-point resistance temperature detector (RTD). Due to the high gas velocity here, to improve testing accuracy, multiple RTDs can be set in the vertical airflow direction, and the control can be performed by measuring the average temperature of the entire cross-section.

[0051] A third temperature sensing element 18 is also provided at the rear end of the vaporization furnace body 1. During operation, the temperature fed back by the third temperature sensing element 18 is within a third preset temperature range. At this time, the temperature at the rear end of the vaporization furnace body 1 is monitored in real time by the third temperature sensing element 18. When the temperature deviates from the third preset temperature range, the controller sends a corresponding execution signal to the third regulating valve 27 (which can be a solenoid valve) to control its valve opening, thereby controlling the amount of water injected and thus regulating the final output steam temperature. In addition, the third temperature sensing element 18 here is the same as the first temperature sensing element 16, and can be a wear-resistant thermocouple commonly used in the art.

[0052] Please see again. Figure 1 As shown, the pre-spray section 11 has a plurality of first atomizing nozzles 14 on its sidewall, which are arranged in a circle at equal intervals around the central axis of the pre-spray section 11. The first atomizing nozzles 14 are connected to a branch line branching off from the water inlet pipe 2. The atomizing spray section has a plurality of second atomizing nozzles 15 on its sidewall, which are arranged in a circle at equal intervals around the central axis of the atomizing spray adjustment section 13. The second atomizing nozzles 15 are connected to a branch line branching off from the water inlet pipe 2. The Venturi mixing section 12 is a section of Venturi tube, with a water inlet at its throat, which is connected to a branch line branching off from the water inlet pipe 2.

[0053] The working principle of the steam generating mechanism of this utility model is as follows:

[0054] During operation, burner 3 generates high-temperature flue gas at approximately 800-1000℃, which is fed into the front end of the vaporizer body 1. Simultaneously, raw water is supplied from an external water supply device through corresponding pipelines to the main pipe 21 of the inlet pipe 2. Due to the serpentine coil structure, the water in the main pipe 21 can absorb some of the heat from the high-temperature flue gas and simultaneously protect the front end of the vaporizer body 1 (to prevent excessive temperature rise). When the high-temperature flue gas reaches the pre-spray section 11, a portion of the raw water (generally controlled to be about 10-20% of the total evaporated water) is sprayed in atomized form through the pre-spray branch 22, mixing with the high-temperature flue gas and rapidly vaporizing, pre-cooling the high-temperature flue gas to approximately 500-700℃ (i.e., the first preset temperature). Subsequently, the pre-cooled flue gas / water vapor mixture enters the Venturi mixing section 12, utilizing... The generated extremely strong turbulence completes the evaporation and homogenization of the water supplied from its throat section (the water volume in this section is generally controlled to be about 70-80% of the total evaporated water volume), rapidly advancing the gas flow material state to a state close to the target state of the final steam product (which can be 20-30℃ higher than the final steam temperature, i.e., the second preset temperature, which can be adjusted according to different situations). Finally, the flue gas / steam mixed gas flow from the Venturi mixing section 12 is then sprayed with atomized water (the water volume in this section is generally controlled to be about 5-10% of the total evaporated water volume) through the atomizing spray regulating section 13 to make relatively precise adjustments to the final output steam temperature (i.e., the third preset temperature, the specific value can be adjusted as needed, and can be set to about 150-180℃). In this way, the entire steam production process can achieve a comprehensive balance of thermal efficiency, steam quality and production controllability.

[0055] Additionally, it should be noted that equipment such as fans that provide power for the transport of high-temperature flue gas are conventional technologies in this field and do not involve the innovative protection points of this utility model, and will not be elaborated here.

[0056] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A direct-flow steam generator, characterized in that, include: The gasification furnace body includes a pre-spray section, a Venturi mixing section and an atomizing spray regulating section arranged sequentially from front to back along the flue gas flow direction; The water inlet pipe includes three branches, which are respectively connected to the pre-spray section, the Venturi mixing section and the atomizing spray section, and are configured to deliver the required raw water to the pre-spray section, the Venturi mixing section and the atomizing spray regulating section respectively. And a burner, which is located at the front end of the gasification furnace body and is configured to generate high-temperature flue gas.

2. The direct-flow steam generator according to claim 1, characterized in that, The water inlet pipe includes a main pipe, which is coiled in a serpentine shape and arranged around the front end of the gasification furnace body and the pre-spray section. The main pipe branches off from the rear end to form a pre-spray branch, a mixing branch, and an atomizing spray branch, respectively corresponding to the pre-spray section, the Venturi mixing section, and the atomizing spray section. Each of the pre-spray branch, the mixing branch, and the atomizing spray branch is equipped with an independently controlled first regulating valve, a second regulating valve, and a third regulating valve.

3. A direct-flow steam generator according to claim 2, characterized in that, A first temperature sensing element is provided at the inlet of the Venturi mixing section. During operation, the opening degree of the first regulating valve satisfies the condition that the temperature fed back by the first temperature sensing element is within a first preset temperature range.

4. A direct-flow steam generator according to claim 2, characterized in that, The outlet of the Venturi mixing section is also provided with a second temperature sensing element. During operation, the opening degree of the second regulating valve satisfies the condition that the temperature fed back by the second temperature sensing element is within a second preset temperature range.

5. A direct-flow steam generator according to claim 2, characterized in that, The rear end of the vaporization furnace body is also provided with a third temperature measuring element. During operation, the temperature fed back by the third temperature measuring element is within a third preset temperature range.

6. A direct-flow steam generator according to claim 1, characterized in that, The sidewall of the pre-spray section is provided with a plurality of first atomizing nozzles, which are arranged in a circle at equal intervals around the central axis of the pre-spray section. The first atomizing nozzles are connected to a branch line branching off from the water inlet pipe.

7. A direct-flow steam generator according to claim 1, characterized in that, The side wall of the atomizing spray section is provided with several second atomizing nozzles, which are arranged in a circle at equal intervals around the central axis of the atomizing spray adjustment section. The second atomizing nozzles are connected to a branch line branching off from the water inlet pipe.

8. A direct-flow steam generator according to claim 1, characterized in that, The Venturi mixing section is a Venturi tube with an inlet at its throat, and the inlet is connected to a branch line branching off from the inlet pipe.

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