Energy-saving system for feed heating furnace of propane dehydrogenation device

Abstract

The utility model relates to industrial energy -conserving technical field, concretely relates to a kind of energy -conserving system of feed heating furnace applied to propane dehydrogenation device, the system includes heating furnace main body, air blower, induced draft fan and heat exchanger;The outlet of air blower is communicated with the air inlet of heat exchanger by first pipeline, the air outlet of heat exchanger is communicated with the air inlet of heating furnace main body by second pipeline;The inlet of induced draft fan is communicated with the first preset position of flue outlet of heating furnace main body by third pipeline, the outlet of induced draft fan is communicated with the flue gas inlet of heat exchanger by fourth pipeline, the flue gas outlet of heat exchanger is communicated with the second preset position of flue outlet of heating furnace main body by fifth pipeline;Wherein, first preset position and second preset position are provided with grid or valve between it.Such, by forced ventilation optimization combustion efficiency, and in combination with flue gas waste heat recovery realizes propane dehydrogenation device feed heating furnace thermal efficiency promotion, energy consumption reduction and pollutant emission reduction.

Description

Technical Field

[0001] This utility model relates to the field of industrial energy-saving technology, specifically to an energy-saving system for a feed heating furnace applied to a propane dehydrogenation unit. Background Technology

[0002] Existing propane dehydrogenation units mostly use natural ventilation for their feed heating furnaces. On the one hand, this has disadvantages such as low air supply efficiency, incomplete fuel combustion, and low thermal efficiency. On the other hand, the exhaust gas temperature is generally high, which leads to energy waste. Moreover, the generation of nitrogen oxides is high under natural ventilation mode, which makes it difficult to meet environmental protection requirements. Therefore, for existing propane dehydrogenation units, there is an urgent need for a solution that integrates improved air supply efficiency while saving energy. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide an energy-saving system for the feed heating furnace of a propane dehydrogenation unit, so as to overcome the problems of low air supply efficiency and emissions that are difficult to meet environmental protection requirements in the current propane dehydrogenation unit.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This application provides an energy-saving system for a feed heating furnace in a propane dehydrogenation unit, comprising: a furnace body, a blower, an induced draft fan, and a heat exchanger;

[0006] The outlet of the blower is connected to the air inlet of the heat exchanger through a first pipe, and the air outlet of the heat exchanger is connected to the air inlet of the heating furnace body through a second pipe.

[0007] The inlet of the induced draft fan is connected to the first preset position of the flue outlet of the main body of the heating furnace through a third pipe, the outlet of the induced draft fan is connected to the flue gas inlet of the heat exchanger through a fourth pipe, and the flue gas outlet of the heat exchanger is connected to the second preset position of the flue outlet of the main body of the heating furnace through a fifth pipe; wherein, a baffle or valve is provided between the first preset position and the second preset position, and the flue gas finally enters the main body of the heating furnace after passing through the second preset position.

[0008] Furthermore, in some embodiments of this application, the heat exchanger is a non-metallic tube sheet flue gas heat exchanger.

[0009] Furthermore, in some embodiments of this application, the outlet of the blower is also connected to the air inlet of the heating furnace body via a sixth pipe.

[0010] Furthermore, in some embodiments of this application, valves are provided on the first pipe, the third pipe, the fourth pipe, and the fifth pipe.

[0011] Furthermore, in some embodiments of this application, the heat exchanger is also connected to a wastewater treatment system via a condensate recovery pipeline.

[0012] Furthermore, in some embodiments of this application, both the blower and the induced draft fan are variable frequency fans.

[0013] Furthermore, in some embodiments of this application, it also includes: a DCS system;

[0014] The DCS system is also used to control the state of the valve.

[0015] This utility model relates to the field of industrial energy-saving technology, specifically to an energy-saving system for a feed heater in a propane dehydrogenation unit. The system includes a heater body, a blower, an induced draft fan, and a heat exchanger. The blower outlet is connected to the air inlet of the heat exchanger via a first pipe, and the heat exchanger air outlet is connected to the air inlet of the heater body via a second pipe. The induced draft fan inlet is connected to a first preset position of the flue gas outlet of the heater body via a third pipe, the induced draft fan outlet is connected to the flue gas inlet of the heat exchanger via a fourth pipe, and the flue gas outlet of the heat exchanger is connected to a second preset position of the flue gas outlet of the heater body via a fifth pipe. A baffle or valve is installed between the first and second preset positions, and the flue gas ultimately enters the heater body after passing through the second preset position. Thus, by implementing forced ventilation, the system optimizes combustion efficiency, and combined with flue gas waste heat recovery technology, it achieves improved thermal efficiency, reduced energy consumption, and reduced pollutant emissions in the feed heater of the propane dehydrogenation unit. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structural principle of the energy-saving system for the feed heating furnace of a propane dehydrogenation unit provided in this embodiment of the utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Figure 1 This is a schematic diagram illustrating the structural principle of the energy-saving system for the feed heating furnace in a propane dehydrogenation unit, as provided in this embodiment of the invention. Please refer to [link / reference]. Figure 1 This embodiment may include: a heating furnace body (including the feeding heating furnace shown in the figure), a blower, an induced draft fan, and a heat exchanger.

[0020] The blower outlet is connected to the air inlet of the heat exchanger via a first pipe, and the air outlet of the heat exchanger is connected to the air inlet of the heating furnace body via a second pipe; the induced draft fan inlet is connected to the first preset position of the flue outlet of the heating furnace body via a third pipe, the induced draft fan outlet is connected to the flue gas inlet of the heat exchanger via a fourth pipe, and the flue gas outlet of the heat exchanger is connected to the second preset position of the flue gas outlet of the heating furnace body via a fifth pipe.

[0021] It should be noted that, among them, the first preset position (i.e. Figure 1 The top of the feed heating furnace is connected to the pipe) and the second preset position (i.e. Figure 1 A baffle or valve is installed between the top of the feed heating furnace and the section connected to the pipeline below the first preset position, and the flue gas finally enters the main body of the heating furnace after passing through the second preset position. That is to say, in actual application, the flue gas enters the heat exchanger through the first preset position and the corresponding pipeline under the operation of the induced draft fan, then reaches the second preset position through the corresponding pipeline, and finally enters the heating furnace (it can be discharged through the heating furnace according to the actual application scenario).

[0022] The energy-saving system for the feed heating furnace in a propane dehydrogenation unit provided in this application, by adding a blower and an induced draft fan, is used to supply combustion air to the furnace and exhaust flue gas, respectively, forming a closed-loop ventilation circuit. This allows for dynamic control of furnace pressure and oxygen content. In actual testing, the coordinated operation of the blower and induced draft fan can create a stable negative pressure environment, improving combustion efficiency to over 92%. Furthermore, a dedicated burner adapted for forced ventilation can be installed to optimize the fuel-air mixing ratio. Simultaneously, by adding a non-metallic tube sheet flue gas heat exchanger, high-temperature flue gas and combustion air exchange heat, preheating the air to a target temperature (e.g., above 120°C) and reducing the exhaust gas temperature to below a target temperature (e.g., below 150°C), thereby preventing sulfide condensate corrosion.

[0023] The operation of the feed heating furnace, such as fuel, feed heating, and boiler water waste heat, are all conventional technical means in this field. They can be understood by referring to the working principle of the propane dehydrogenation unit in the prior art, and will not be elaborated here.

[0024] Furthermore, in some embodiments of this application, the heat exchanger is a non-metallic tube sheet flue gas heat exchanger.

[0025] It should be noted that, in Figure 1 In the diagram, the red line with arrows indicates the direction of flue gas flow, and the green line indicates the direction of air flow, corresponding to the actual installed pipes. Furthermore, in some embodiments of this application, the outlet of the blower is also connected to the air inlet of the heating furnace body through a sixth pipe, so that when the air supplied to the heating furnace through the heat exchanger is insufficient, air is directly supplied to the heating furnace through the blower to ensure that the heating furnace maintains normal operation.

[0026] Based on this, the energy-saving system for the feed heating furnace of the propane dehydrogenation unit provided in this application can also be equipped with multiple valves on the pipelines to control the flow rate of the aforementioned gases, including valves on the first, third, fourth, fifth, and sixth pipelines mentioned above. Relevant personnel can manually adjust one or more valves to adjust and control the system's operating status.

[0027] In addition, such as Figure 1 As shown, in some embodiments of this application, a connecting pipeline can be provided at the inlet and outlet of the heat exchanger flue gas, and a valve can be installed on it to facilitate the adjustment and control of the heat exchanger's operating status.

[0028] Furthermore, in some embodiments of this application, the heat exchanger is also connected to a wastewater treatment system via a condensate recovery pipeline, thereby discharging the condensate generated by the heat exchanger into the wastewater system.

[0029] Based on this, in some other embodiments of this application, both the blower and the induced draft fan can be variable frequency fans. The energy-saving system for the feed heating furnace of the propane dehydrogenation unit also includes: a DCS system; the DCS system is used to control the operating parameters of the blower and the induced draft fan based on the oxygen content in the furnace and the flue gas temperature in the main body of the heating furnace, and the DCS system can also be used to control the state of the valves.

[0030] Specifically, it can monitor the oxygen content in the furnace and the flue gas temperature in real time, and dynamically adjust the operating parameters of the blower and induced draft fan.

[0031] Furthermore, the valves of the blower bypass and flue gas heat exchanger bypass (i.e., the first to sixth pipes mentioned above) can be automatically adjusted through the DCS system. The waste heat recovery efficiency and combustion conditions can be controlled in conjunction with the DCS system to achieve precise control of the combustion air temperature, flue gas temperature, and furnace oxygen content, thereby replacing traditional manual adjustment. This can achieve fully automatic control, reduce labor costs, and improve operational stability (of course, it can also be adjusted manually as mentioned above).

[0032] The energy-saving system for the feed heater of a propane dehydrogenation unit provided in this application involves installing a blower on the inlet side of the heater and an induced draft fan at the flue outlet, connected by a non-metallic tube sheet flue gas heat exchanger to form a closed-loop ventilation circuit. The flue gas heat exchanger is made of corrosion-resistant non-metallic materials, and a condensate recovery pipeline is installed to the wastewater treatment system. Based on this, after starting the blower and induced draft fan, the bypass valve can be adjusted via the DCS system to maintain the furnace negative pressure at -20 to -30 Pa and the oxygen content stable at 3% to 5%.

[0033] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0034] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0035] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of the present invention pertain.

[0036] It should be understood that the various parts of this utility model can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0037] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0038] Furthermore, the functional units in the various embodiments of this utility model can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0039] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An energy-saving system for a feed heating furnace applied in a propane dehydrogenation unit, characterized in that, include: The main body of the heating furnace, blower, induced draft fan, and heat exchanger; The outlet of the blower is connected to the air inlet of the heat exchanger through a first pipe, and the air outlet of the heat exchanger is connected to the air inlet of the heating furnace body through a second pipe. The inlet of the induced draft fan is connected to the first preset position of the flue outlet of the main body of the heating furnace through a third pipe, the outlet of the induced draft fan is connected to the flue gas inlet of the heat exchanger through a fourth pipe, and the flue gas outlet of the heat exchanger is connected to the second preset position of the flue outlet of the main body of the heating furnace through a fifth pipe; wherein, a baffle or valve is provided between the first preset position and the second preset position, and the flue gas finally enters the main body of the heating furnace after passing through the second preset position.

2. The energy-saving system for the feed heating furnace of a propane dehydrogenation unit according to claim 1, characterized in that, The heat exchanger is a non-metallic tube sheet flue gas heat exchanger.

3. The energy-saving system for the feed heating furnace of a propane dehydrogenation unit according to claim 2, characterized in that, The outlet of the blower is also connected to the air inlet of the main body of the heating furnace via a sixth pipe.

4. The energy-saving system for the feed heating furnace of a propane dehydrogenation unit according to claim 3, characterized in that, Valves are installed on the first pipe, the third pipe, the fourth pipe, the fifth pipe, and the sixth pipe.

5. The energy-saving system for the feed heating furnace of a propane dehydrogenation unit according to claim 4, characterized in that, The heat exchanger is also connected to the wastewater treatment system via a condensate recovery pipeline.

6. The energy-saving system for the feed heating furnace of a propane dehydrogenation unit according to claim 5, characterized in that, Both the blower and the induced draft fan are variable frequency fans.

7. The energy-saving system for the feed heating furnace of a propane dehydrogenation unit according to claim 6, characterized in that, It also includes a DCS system, which is used to control the state of the valve.

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