Ultrahigh-temperature flue gas waste heat recycling pipeline structure
By designing the ultra-high temperature flue gas waste heat recovery and utilization pipeline structure in the tunnel kiln and using the structural arrangement of the waste heat channel inside the insulation layer, the problem of low waste heat utilization efficiency in the prior art is solved, and efficient waste heat utilization and energy conservation are achieved.
Patent Information
- Application Number
- CN202422171942.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-05
AI Technical Summary
In the prior art, the flue gas waste heat utilization efficiency of the continuous tunnel kiln is low, and the pipelines are long and there is a lot of heat dissipation, resulting in energy waste and environmental impact.
A super high temperature flue gas waste heat recovery and utilization pipeline structure is designed. By setting a forced cooling zone, waste heat channel and preheating zone in the tunnel kiln, the waste heat channel is used to arrange the structure inside the insulation layer, so that it is both a waste heat channel and a thermal insulation layer in the firing zone.
It improves the utilization efficiency of waste heat of flue gas, saves energy, and reduces environmental impact. It also has a compact structure, small footprint and convenient maintenance and use.
Smart Images
Figure CN223005344U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a continuous tunnel kiln, in particular to a pipeline structure for recovering and utilizing ultra-high temperature flue gas waste heat of a continuous tunnel kiln. Background Art
[0002] When firing materials in a tunnel kiln, it generally goes through three stages: preheating stage, firing stage, and forced cooling stage. Therefore, for a continuous feeding tunnel kiln, it can be divided into three zones: preheating zone, firing zone, and forced cooling zone. When the materials are fired in the kiln, they will contain a large amount of heat. If this heat is allowed to dissipate into the environment without being utilized, it will not only cause waste of energy but also have an adverse impact on the surrounding environment. For the existing waste heat utilization after firing products, it is generally led out by pipelines, or enters a heat accumulator or a heat exchanger, or directly enters the preheating zone for preheating. However, the leading-out pipelines are generally long and distributed outside the furnace, and heat insulation needs to be done. There is a lot of heat dissipation during the process, and the waste heat utilization efficiency is low. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is: aiming at the defects of the prior art, to provide a pipeline structure for recovering and utilizing ultra-high temperature flue gas waste heat of a continuous tunnel kiln.
[0004] The utility model adopts the following technical solutions to solve the above technical problems:
[0005] A pipeline structure for recovering and utilizing ultra-high temperature flue gas waste heat, which is composed of a forced cooling zone, a waste heat channel, and a preheating zone arranged in the tunnel kiln, wherein:
[0006] The waste heat channel is arranged between the outer insulation layer and the inner insulation layer on both sides of the firing zone, and its air inlet is arranged on both sides of the entrance of the forced cooling zone, and the air outlet is arranged on both sides of the exit of the preheating zone.
[0007] Preferably, the inner cavity of the tunnel kiln is sequentially divided into the preheating zone, the firing zone, and the forced cooling zone along the material flow direction, and sealing soft curtains are arranged at both ends and at the joints of each zone.
[0008] Preferably, the waste heat channel is composed of a straight section and a bent section, wherein:
[0009] The straight section is located between the outer insulation layer and the inner insulation layer and is arranged parallel to the firing zone;
[0010] There are two bent sections, the inner ends of which are respectively connected to both ends of the straight section, and the other ends are respectively inclined and communicated with the entrance of the forced cooling zone and the exit of the preheating zone.
[0011] More preferably, a plurality of layers of hollow refractory bricks are laid along the length direction of the straight-through section and are spliced front and back in sequence. Each layer of the hollow refractory bricks is penetrated front and back to form an independent waste heat diversion channel.
[0012] Even more preferably, an annular protrusion is provided on the front end face of the hollow refractory brick, and an annular groove is provided on the rear end face. The front and rear hollow refractory bricks are spliced and connected through the annular protrusion and the annular groove.
[0013] More preferably, the inclination angle of the bent section relative to the material flow direction is 30-60°, and the bent part has a smooth transition.
[0014] Preferably, an upper heat insulation layer is provided at the top of the outer heat insulation layer and the inner heat insulation layer, and lower heat insulation layers are respectively provided at the bottoms on both sides.
[0015] Preferably, a blower communicated therewith is provided at the outlet of the forced cooling zone, and / or an induced draft fan communicated therewith is provided at the inlet of the preheating zone.
[0016] Preferably, a walking track is arranged at the bottom of the tunnel kiln and penetrates through the preheating zone, the firing zone and the forced cooling zone.
[0017] More preferably, a plurality of loading trolleys running back and forth are arranged on the walking track, and a material carrier is placed on the loading trolley.
[0018] The present utility model adopts the above technical solutions, and compared with the prior art, has the following technical effects:
[0019] The ultra-high temperature flue gas waste heat recovery and utilization pipeline structure provided by the present utility model is composed of a forced cooling zone, a waste heat channel and a preheating zone arranged in a tunnel kiln. A waste heat channel is formed between the outer heat insulation layer and the inner heat insulation layer on both sides of the firing zone. By using the structural arrangement of the waste heat channel inside the heat insulation layer, the channel is both a waste heat channel and a heat insulation layer of the firing zone, with high waste heat utilization efficiency and good overall energy-saving effect; and the pipeline structure is structurally compact, occupies a small area, and is convenient for maintenance and use. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a schematic plan sectional structure view of an ultra-high temperature flue gas waste heat recovery and utilization pipeline structure of the present utility model;
[0021] Figure 2 is a schematic enlarged partial structure view of part A in an ultra-high temperature flue gas waste heat recovery and utilization pipeline structure of the present utility model;
[0022] Figure 3 is a schematic elevation sectional structure view of an ultra-high temperature flue gas waste heat recovery and utilization pipeline structure of the present utility model;
[0023] Figure 4 This is a schematic diagram of the structure of the hollow refractory bricks that form the straight-through section waste heat channel in a waste heat recovery and utilization pipeline structure of a super-high temperature flue gas for the present utility model. Specific embodiments
[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.
[0025] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.
[0026] In some embodiments, as Figure 1 and Figure 3 shown, a waste heat recovery and utilization pipeline structure for a continuous tunnel kiln is provided. The inner cavity of the tunnel kiln 100 is sequentially divided into a preheating zone 101, a firing zone 102, and a forced cooling zone 103 along the material flow direction. The waste heat recovery and utilization pipeline structure mainly consists of a forced cooling zone 103, a waste heat channel 130, and a preheating zone 101 provided in the tunnel kiln 100. The preheating zone 101 and the forced cooling zone 103 are connected through the waste heat channel 130, and the waste heat gas flow direction is from the forced cooling zone 103 through the waste heat channel 130 to the preheating zone 101.
[0027] To ensure that the waste heat gas flow is from the forced cooling zone 103 to the preheating zone 101, it is necessary to separately isolate and seal the preheating zone 101, the firing zone 102, and the forced cooling zone 103, which can be achieved by using a sealing soft curtain 140. Specifically, sealing soft curtains 140 are respectively provided at the entrance of the preheating zone 101, the exit of the forced cooling zone 103, and the entrance and exit of the firing zone 102. The sealing soft curtain 140 closely adheres to the two side walls and the top of the material carrier 400 running back and forth to achieve the purpose of sealing.
[0028] Specifically, the waste heat channel 130 is provided between the outer insulation layer 110 and the inner insulation layer 120 on both sides of the firing zone 102. The air inlet of the waste heat channel 130 is provided on both sides of the entrance of the forced cooling zone 103, and the air outlet of the waste heat channel 130 is provided on both sides of the exit of the preheating zone 101. This makes the waste heat channel 130 form a connected air flow channel with the forced cooling zone 103 and the preheating zone 101 at both ends.
[0029] In some of these embodiments, as Figure 1 and Figure 2As shown, the waste heat channel 130 is composed of a straight section 131 and bent sections 132 located at both ends of the straight section 131. The straight section 131 and the bent sections 132 at both ends can be a hollow area surrounded by an outer thermal insulation layer 110 and an inner thermal insulation layer 120, or can be composed of hollow support bricks such as pipes laid in this hollow area.
[0030] Specifically, the straight section 131 is a straight line segment, located between the outer thermal insulation layer 110 and the inner thermal insulation layer 120, and is arranged in parallel with the firing zone 102. The bent sections 132 are two sections, and their inner ends are respectively connected to both ends of the straight section 131, and the other ends are respectively inclined to communicate with the inlet of the forced cooling zone 103 and the outlet of the preheating zone 101.
[0031] In some of the embodiments, to improve the structural strength and heat insulation effect of the waste heat channel 130, hollow refractory bricks are laid along the length direction in the straight section 131, and each layer of the hollow refractory bricks penetrates through from front to back to form independent waste heat diversion channels. According to the ventilation volume and process requirements, the hollow refractory bricks can be laid into several layers and several columns, and the multiple waste heat diversion channels formed up and down are communicated with the bent sections 132 at both ends. Of course, according to needs, the bent sections 132 at both ends of the waste heat channel 130 also adopt a porous structure made of stacked hollow refractory bricks, and this porous structure is correspondingly communicated with each waste heat diversion channel on the straight section 131.
[0032] To facilitate the laying of the straight section 131 and ensure the sealing performance, an annular protrusion 1311 is provided on the front end face of the hollow refractory brick, and an annular groove 1312 is provided on the rear end face of the hollow refractory brick. When laying the straight section 131, the annular protrusion 1311 at the front end of the hollow refractory brick is embedded into the annular groove 1312 on the rear end face of the previous hollow refractory brick, and each hollow refractory brick is spliced end to end in sequence, and multiple layers are laid to form multiple independent waste heat diversion channels.
[0033] In addition, to increase the flow rate of the waste heat gas flow in the gas flow channel of the forced cooling zone 103 - waste heat channel 130 - preheating zone 101 and avoid being affected by the corner resistance. The inclination angle of the bent section 132 relative to the material flow direction is 30 - 60°, and its bending part is a smooth transition. And the inlet where the bent section 132 is connected to the forced cooling zone 103 adopts a smooth transition to facilitate the gas flow to enter the waste heat channel 130 from the forced cooling zone 103; and the outlet where the other bent section 132 is connected to the air outlet and the preheating zone 101 also adopts a smooth transition to facilitate the gas flow to enter the preheating zone 101 from the waste heat channel 130.
[0034] In addition, in some of the embodiments, such as Figure 3As shown in the figure, to improve the overall heat insulation effect of the tunnel kiln 100, along the length direction of the tunnel kiln 100, an upper heat insulation layer 150 is provided at the top of the outer heat insulation layer 110 and the inner heat insulation layer 120, and lower heat insulation layers 160 are respectively provided at the bottoms on both sides. The upper heat insulation layer 150 is arranged across the outer heat insulation layers 110 on both left and right sides, and there are two lower heat insulation layers 160, which are respectively provided at the bottom positions of the outer heat insulation layers 110 and the inner heat insulation layer 120 on both sides.
[0035] In some of these embodiments, as Figure 1 shown in the figure, to realize the flow reuse of the waste heat gas flow in the entire high-temperature kiln 100, an external device is used to provide the flow power of the fluid. Exhaust fans 300 and blowers 200 can be provided at both ends of the high-temperature kiln 100. The exhaust fans 300 and the blowers 200 can be arranged simultaneously, or they may not be configured simultaneously according to needs.
[0036] For example, according to needs, an exhaust fan 300 communicated with it is provided at the entrance of the preheating zone 101. The exhaust fan 300 is communicated with the ventilation outlets opened on the heat insulation bodies on both sides of the entrance of the preheating zone 101 through pipelines, and the exhaust fan 200 uses a vacuum fan. And / or a blower 200 communicated with it is provided at the exit of the forced cooling zone 103. The blower 200 is communicated with the ventilation inlets opened on the heat insulation bodies on both sides of the exit of the forced cooling zone 103 through pipelines.
[0037] During the production of the kiln, the blower 200 and the exhaust fan 300 operate, and the waste heat gas flow is made to flow from the forced cooling zone 103 into the preheating zone 101 through the waste heat channel 130, efficiently utilizing the waste heat of the product without diversion; at the same time, since a sealing soft curtain 140 is provided at the entrance and exit of the firing zone 102, the reused waste heat gas flow will not interfere with the firing zone 102 either.
[0038] In addition, as Figure 1 and Figure 3 shown in the figure, a walking track 600 is provided at the bottom of the tunnel kiln 100, which runs through the preheating zone 101, the firing zone 102, and the forced cooling zone 103. And a number of loading trolleys 500 running back and forth are provided on the walking track 600, and a material carrier 400 is placed on the loading trolley 500.
[0039] During operation, the loading trolleys 500 synchronously carry the loading trolleys 500 and shuttle on the walking track 600, passing through the preheating zone 101, the firing zone 102, and the forced cooling zone 103 in sequence, and the materials in the material carrier 400 are sequentially preheated, high-temperature calcined, and forced cooled.
[0040] The following points should be noted: First, in the description of this application, it should be noted that unless otherwise specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense, which can be a mechanical connection or an electrical connection, or the communication inside two components, and can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;
[0041] Second, in the drawings of the disclosed embodiments of the present utility model, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;
[0042] Finally, the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A super-high temperature flue gas waste heat recovery pipeline structure, characterized in that: The waste heat recovery pipeline structure is composed of a forced cooling zone, a waste heat channel and a preheating zone arranged in the tunnel kiln, wherein: the waste heat channel is arranged between the outer insulation layer and the inner insulation layer on both sides of the firing zone, and its air inlet is arranged on both sides of the entrance of the forced cooling zone, and the air outlet is arranged on both sides of the outlet of the preheating zone.
2. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 1 is characterized in that: The inner cavity of the tunnel kiln is divided into the preheating zone, the firing zone and the forced cooling zone in sequence along the direction of logistics operation, and sealed soft curtains are provided at the ports at both ends and at the connections between the zones.
3. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 1 is characterized in that: The waste heat channel is composed of a straight section and a bent section, wherein: The straight-through section is located between the outer insulation layer and the inner insulation layer, and is arranged parallel to the sintering zone; There are two bending sections, the inner ends of which are respectively connected to the two ends of the straight section, and the other ends are respectively connected at an angle to the inlet of the forced cooling zone and the outlet of the preheating zone.
4. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 3 is characterized in that: Several layers of hollow refractory bricks are laid in the straight section along its length direction. The hollow refractory bricks in each layer are connected front to back to form an independent waste heat diversion channel.
5. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 4 is characterized in that: The front end surface of the hollow refractory brick is provided with an annular protrusion, and the rear end surface is provided with an annular groove. The front and rear hollow refractory bricks are spliced and connected through the annular protrusion and the annular groove.
6. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 3 is characterized in that: The inclination angle of the bending section relative to the logistics running direction is 30-60°, and the bending portion thereof is a smooth transition.
7. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 1 is characterized in that: An upper insulation layer is arranged on the top of the outer insulation layer and the inner insulation layer, and lower insulation layers are arranged on the bottom of both sides respectively.
8. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 1 is characterized in that: The outlet of the forced cooling zone is provided with a blower in communication therewith, and / or the inlet of the preheating zone is provided with an exhaust fan in communication therewith.
9. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 1 is characterized in that: The bottom of the tunnel kiln is provided with a walking track which runs through the preheating zone, the firing zone and the forced cooling zone.
10. The ultra-high temperature flue gas waste heat recovery pipeline structure according to claim 9 is characterized in that: A plurality of shuttle-running material-carrying trolleys are arranged on the travel track, and material carriers are placed on the material-carrying trolleys.