Heat Recovery and Controlled Steam Generation System for Industrial Furnaces.

Abstract

The invention is a system for generating steam from waste heat in gas-fired industrial or household ovens. Gases formed in the combustion and lower distribution chamber (4) pass through the burnt gas passage channels (3), heat the cooking air, and the burnt gas is collected in the upper collection chamber (2). The gases are conveyed through the burnt gas inlet line (10) to the inner tube of the compact steam generator (1), while water is fed to the outer tube via the water inlet line (5). Heat transfer fins (6) and heater (8) support evaporation. The generated steam is conveyed through the steam outlet line (9) to the cooking chamber, while the cooled gas is discharged through the waste gas outlet line (7).

Description

1 TARIFF Heat Recovery and Controlled Steam Generation System for Industrial Furnaces TECHNICAL AREA 5 The invention is for heating ovens to be used in industrial or home kitchens. It is related to recovery and steam generation systems. The invention specifically addresses 10 issues that arise during the cooking process in industrial food ovens. by enabling the recycling of high-temperature waste heat, the same system It contains both a cooking air heating system and a separate large water tank, and steam with a compact steam generator without the need for a separate second burner. an innovative heat recovery and controlled system that enables its production. It is related to the steam generation system. 15 STATE OF THE ART Today, industrial food ovens use steam to heat the cooking air. Generally, two separate burners are used to ensure its production. This 20 In these systems, the burnt gas obtained from the primary burner is used to heat the cooking air. It is in use, and the exhaust temperature of the burnt gas at the chimney outlet is approximately It reaches levels of 267 °C. This situation indicates the thermal activity generated within the system. a significant portion of the energy is released into the atmosphere without being recovered, therefore This shows that energy efficiency has decreased and emission levels have increased. This 25 In this respect, existing systems are important in terms of energy efficiency and system integrity. It includes shortcomings. Current practices for steam generation require approximately 6.5 liters of water. It has a tank, and all the water in the tank is pumped into a second 30 kW generator with a power of approximately 15 kW. It is heated by means of a burner. This structure produces only the required amount of steam. Instead of producing water, this necessitates keeping the entire volume of water constantly hot. Therefore, it leads to unnecessary energy consumption. Also, the cooking process... The presence of unused hot water or steam remaining in the tank after completion, 2 an efficient and controlled system suitable for the instantaneous and variable steam needs of the existing system. This reveals that it is unable to provide working characteristics. In addition, the secondary burner and water tank provide extra space within the furnace body. coating increases the system weight, negatively impacts manufacturing costs, and an additional 5 The fact that it generates energy consumption is another significant shortcoming of current practices. The use of a second burner also results in the generation of additional flue gases and emissions; The water tank, by occupying space within the oven's interior, results in a more compact, simple, and efficient design. This limits the implementation of their solutions. In conclusion, current industrial food oven systems utilize waste heat that is expelled through the chimney. energy loss due to high exhaust temperatures that cannot be utilized effectively This is because steam production requires a separate burner and a large-volume water tank. hearing, therefore in terms of energy consumption, volume, weight, cost and emissions These are systems that contain shortcomings. 15 Another application within the prior art is number TR2024 / 013504. It is a heat recovery steam generation system described in the patent application. The mentioned The application aims to reduce high energy losses in traditional furnaces by utilizing waste heat. redirected steam generation, thereby increasing the overall energy efficiency of the system, furnace 20 significant contributions to establishing internal thermal balance and reducing emissions This system provides; in this system, the heat exchanger structure used for steam production Water passes through the inner central section, while hot gas flows through the outer channels. This is achieved by generating mechanical vibrations during the process of conveying water into the cabin. An atomizer mechanism is used, and additional heat input is achieved via Peltier elements at 25°C. Heat is supplied through auxiliary heat sources. However, the system steam generation via a water tank / reservoir in which water is stored. is being carried out. While this system offers significant solutions compared to its predecessor, some 30 It has structural and operational limitations:  A flow design in which water passes through the inside and hot burnt gas passes through the outside, High temperature gas increases thermal losses to the environment and heat transfer 3 This leads to the surface area not being used efficiently enough on the gas side. It opens.  A device that produces mechanical vibrations, such as an atomizer, to transmit steam into the cooking chamber. Dependence on active and movable elements, the number of components in the system and This increases the risk of malfunctions due to limescale / blockages. 5  The inclusion of a water reservoir within the system provides more than just instant steam production. This requires maintaining the water level in the reservoir at a specific level; this is important both for... this leads to both the occupation of extra space and the wasted heat loss of unused water. This is the reason.  Heat generation involves complex processes such as Peltier elements, requiring additional control. Supporting it with components reduces both electrical and mechanical costs. It is raising the bar. Ultimately, the problems mentioned above, which cannot be solved with current technology, are related. This has made it necessary to make an innovation in the technical field. 15 A BRIEF DESCRIPTION OF THE INVENTION The present invention eliminates the aforementioned disadvantages and the related technical To bring new advantages to the field, heat recovery systems for industrial ovens and 20 It is related to a controlled steam generation system. The main purpose of the invention is to eliminate the substances that arise during the cooking process in industrial food ovens. by enabling the recycling of high-temperature waste heat, the same system It contains both the heating of the cooking air and the production of steam. to enable its realization. Another aim of the invention is to replace the separate steam burner commonly used in current technology, Eliminates the need for large-volume water tanks and associated auxiliary components. The goal is to transform the system into a simpler, more compact, and more efficient structure by removing 30 elements. Another aim of the invention is to maintain a constant volume of water thanks to the compact steam generator. Instead of maintaining a constant temperature, steam is produced on demand and in a controlled manner. 4 to ensure its implementation; thus preventing unnecessary energy consumption, wasted heat loss, and The goal is to reduce the volume occupied within the system. Another purpose of the invention is to utilize low-power auxiliary heat located within the generator. Through this source, water is converted to vapor phase more quickly with heat recovery. 5 to support its passage and controlled operating conditions responsive to instantaneous steam demand. to present. The best way to utilize the advantages of the existing invention, together with its structure and additional elements. For it to be understood, it should be evaluated together with the figures explained below. 10 is necessary. BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows the furnace 15 of the heat recovery and controlled steam generation system, which is the subject of the invention. It is a perspective view showing the overall layout within the body. Figure 2 shows the combustion volume, heat exchanger structure, and steam generator of the system subject to the invention. This is a side view showing the oven's internal integration. Figure 3 shows how the hot gas passes through the burnt gas passages and goes not through the chimney but through an additional passage. This is the perspective view of how it enters the steam generator. Figure 4 shows the gas flow directions and fins inside the compact steam generator. It is a transparent perspective view showing its structure. 25 Figure 5 shows the internal design of the compact steam generator to enhance heat transfer within its wall thickness. It is a cross-sectional view showing the fins and concentric lines. REFERENCE NUMBERS 30 1 Compact Steam Generator 2. Upper Collection Volume of Burnt Gases 3. Burnt Gas Passage Channels 4 Combustion and Subdivision Volume Water Inlet Line 6 Internal Fins for Enhancing Heat Transfer 7 Waste Gas Outlet Lines 8 Heaters 9 Steam Outlet Line 5 Burnt Gas Inlet Line DETAILED DESCRIPTION OF THE INVENTION This detailed explanation of the invention's innovation not only helps to better understand the subject matter, but also... This is explained with examples that will not create any limiting effect. The system described in this invention is suitable for both industrial-type gas-powered food ovens and household-type ovens. It is suitable for use in ovens. The system basically heats the cooking air. with combustion line components providing and the high-temperature gas exiting through this line 15 from the design of a compact steam generator (1) that produces instant steam by using its heat It consists of. On the combustion side of the system; the air-gas mixture coming from the burner (burner unit) a combustion and sub-distribution volume (4) where the hot gas produced is burned and distributed 20 It receives high-temperature burnt material rising from the combustion and lower distribution volume (4). The gases move along the burnt gas passage channels (3) that extend vertically, cooking It transfers heat to the air. Hot gases leaving the transition channels (3), The burnt gas located in the upper region is collected in the upper collection volume (2). The gases collected in the upper collection volume of the burnt gas (2) are discharged directly. instead of being converted to a compact steam generator via a burnt gas inlet line (10) (1) is directed. The compact steam generator (1) combines the burnt gas with water. It is designed with a concentric tubular structure in which it moves from its center. This concentric structure... In the piping system, high-temperature burnt gas travels 30 kilometers from the center along the inner line. While the gas is being passed through, water flow is provided via an external line. High-temperature gas This reversed radial arrangement, where the water to be evaporated passes through from the inside and from the outside; transferring the high thermal energy in the center directly to the water in the outer perimeter It provides heat by preventing the hot gas from losing heat uncontrollably to the outside environment. 6 maximizing transfer efficiency and preventing stagnant water from remaining in the reservoir. It accelerates the evaporation of water upon contact without the need for a generator. (1) within its premises; water is taken from the network or a supply line at a controlled flow rate a water inlet line (5), burnt gas inlet line (10) to meet the burnt gas flow, its heat a waste gas outlet line (7) that allows the discharge of the released gas and the steam produced 5 a steam outlet line through which steam is freely and directly conveyed to the cooking chamber (9) It is located. As shown in Figure 4, the heat transfer from the combustion gas to the water is maximized. In order to extract and rapidly convert water into steam phase, generator (1) 10 by disrupting the flow regime within the body and creating turbulence, it increases the transfer surface area. Internal fins (6) are positioned to increase heat transfer. compact steam In the concentric tube structure of the generator (1), from the inner tube to the outer tube, the outer tube of the inner tube It extends between the surface and the inner surface of the outer pipe, increasing heat transfer from the burnt gas to the water. A small heat transfer fin (6) is structured. In this way, 15 in the concentric tube structure by creating an expanded contact surface and a homogeneous heat transfer bridge from the inside The heat of the flowing hot gas is transferred to the external water line with a high conductivity coefficient. This information is also transmitted in cases where the instantaneous need for steam increases, sudden peak demands occur, or compact steam to support heat recovery in the furnace's initial operating conditions The generator (1) contains a low-power auxiliary heater (8). 20 Based on the information given above, the working principle of the invention is as follows: The furnace The burnt gases formed in the combustion and lower distribution volume (4) with the operation of the burnt gases The gas passes through the passage channels (3) and heats the oven baking air. Through the channels (3) The gases released are collected in the burnt gas upper collection volume (2) and sent to the burnt gas inlet line 25 It enters the inner channel of the compact steam generator (1) via (10). Simultaneously Water is supplied from the water inlet line (5) to the generator's (1) external channel at a controlled flow rate. Gas concentric tube structure with water flowing from the inside and from the outside, and interior designed to enhance heat transfer. Thanks to the fins (6), the heat of the hot gas is transferred directly and quickly to the water; the water, It instantly reaches the vapor phase without requiring any fixed storage volume. The process is completed with the low-power heater (8) which comes into play when additional steam is needed. is supported. The resulting vapor does not require mechanical vibrators such as atomizers. While its heat is transferred directly from the steam outlet line (9) to the cooking chamber by free flow The waste gas released is discharged through the waste gas outlet line (7).

Claims

7 REQUESTS 1. A steam generation system for gas-powered industrial or household cooking ovens. and its feature is; 5  A system where hot gases produced by burning air from a burner are dispersed. combustion and lower distribution volume (4),  Cooking gases rising from the mentioned combustion and lower distribution volume (4) through which the burnt gas passes by heating the air (3),  A 10 where the gases rising from the aforementioned burnt gas passage channels (3) are collected. burnt gas upper collection volume (2),  The internal line of the burnt gas coming out of the mentioned burnt gas upper collection volume (2) the water to be evaporated is passed through the center along the entire length, while the water to be evaporated is passed through the external line. at least one compact steam generator in the form of a concentric tube to which it is fed (1) and 15  The steam produced in the compact steam generator (1) is directed directly into the cooking chamber. a steam outlet line (9) It includes.

2. A steam generation system according to claim 1, characterized by having a compact steam generator of 20 (1) In the concentric pipe structure, from the inner pipe to the outer pipe, the outer surface of the inner pipe It extends between the inner surface of the outer pipe and the outer surface, increasing heat transfer from the burnt gas to the water. It must contain at least one heat transfer fin (6).

3. A steam generation system according to claim 1 or 2, characterized by: burnt gas top 25 The gas collected in the collection volume (2) is transferred to the inner channel of the compact steam generator (1) It includes a directing burnt gas inlet line (10).

4. A steam generation system according to any of claims 1 to 3, characterized by its compactness. A waste gas 30 that allows the discharge of the waste gas that releases its heat in the steam generator (1). It includes the output line (7). 8 5. A steam generation system according to any of claims 1 to 4, the characteristic of which is; water feeding the external channel of the compact steam generator (1) with controlled flow It includes a water inlet line (5) that provides.

6. It is a steam generation system according to claim 5, and its characteristic is that the water inlet line mentioned is (5) 5 to provide water supply at a controlled flow rate via the network or a supply line It is about being connected.

7. A steam generation system according to any of claims 1 to 6, characterized by its compactness. steam generator (1) located within and instantaneous steam production 10 It must contain at least one additional heater (8) to support it.

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