Still kettle condensate water recovery waste heat heating system adopting fan coil assembly

Abstract

The utility model provides an autoclave condensate water recovery waste heat heating system adopting a fan coil assembly, and belongs to the technical field of autoclaved aerated concrete manufacturing and heat energy recovery. In the heating system, the primary side of a heat exchanger is connected with an autoclaved condensed water recycling storage tank, a heating connector arranged on the secondary side of the heat exchanger is connected with two branch main pipes, the first branch main pipe is used for supplying high-temperature condensed water to a marshalling area, and the second branch main pipe is used for supplying high-temperature condensed water to a curing area; a plurality of first hot water branches arranged in a grouping area are connected with a first branch main pipe, a plurality of second hot water branches arranged in a maintenance area are connected with a second branch main pipe, and the first hot water branches and the second hot water branches are both connected with a plurality of fan coil assemblies. Under the action of a fan of the fan coil assembly, forced convection heating is conducted on the area where the fan coil assembly is located. According to the utility model, the energy consumption of the aerated block and plate production process is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of autoclaved aerated concrete manufacturing and heat recovery technology, specifically relating to an autoclave condensate recovery waste heat heating system using fan coil unit assembly, which is used to heat the autoclaving curing area and marshalling area by recovering waste heat from autoclave condensate through fan coil unit assembly. Background Technology

[0002] Autoclaved aerated concrete (such as aerated bricks, panels, etc.) is a lightweight porous silicate product made from siliceous and calcareous materials as the main raw materials, with the addition of a foaming agent, through processes such as batching, mixing, pouring, pre-curing, cutting, autoclaving, and curing. It has advantages such as light weight, high thermal insulation performance, and good sound absorption.

[0003] In the autoclave industry, heating (drying) of the curing and marshalling areas (where the ambient temperature requirement is 60℃) generally adopts a steam heating mode. This involves using steel radiators with steam pipes for heating. The steam required for heating is typically boiler-produced steam or autoclave exhaust steam. Boiler-produced fresh steam consumes a large amount of fuel, while using autoclave exhaust steam for heating is limited by the production process, resulting in poor timing and spatial coordination between autoclave exhaust steam and heating. Furthermore, if autoclave exhaust steam is used for heating, regardless of whether the curing and marshalling areas require heating (drying), the autoclave will discharge exhaust steam into the heating system, causing significant energy waste. Utility Model Content

[0004] The purpose of this invention is to provide a heating system for the autoclaved curing area and the grouping area using fan coil units, so as to improve the heat energy utilization rate in the autoclaved aerated concrete manufacturing process.

[0005] According to an embodiment of this utility model, a heating system for a steam-pressurized curing area and a marshalling yard is provided. The heating system includes: a heat exchanger, the primary side of which is connected to a steam-pressurized condensate recovery storage tank, and a heating interface on the secondary side; a first branch main pipe and a second branch main pipe respectively connected to the heating interface, the first branch main pipe being used to supply high-temperature hot water to the marshalling yard, and the second branch main pipe being used to supply high-temperature hot water to the curing area; multiple first condensate branches set in the marshalling yard, each connected to the first branch main pipe; and multiple second hot water branches set in the curing area, each connected to the second branch main pipe. Multiple fan coil units are connected to both the first and second hot water branches. When high-temperature hot water flows through the heat exchanger of the fan coil unit, forced convection heating is provided to the area under the action of the fan in the fan coil unit.

[0006] In other examples, multiple second hot water branches are connected in parallel at predetermined intervals on the second branch main pipe, and multiple fan coil units are connected in parallel at predetermined intervals on each second hot water branch.

[0007] In other examples, the first branch main pipe is connected to two first hot water branches at predetermined intervals, and each first hot water branch is connected in parallel to multiple fan coil units at predetermined intervals.

[0008] In other examples, each fan coil unit assembly includes two fan coil units connected to the corresponding hot water branch via connecting pipes.

[0009] In other examples, the connection lines include input connection lines and output connection lines.

[0010] In other examples, control valves are installed on both the input and output connection lines.

[0011] In other examples, the heating interface is connected to a high-temperature water storage tank for condensate recovery.

[0012] This invention utilizes the high-temperature condensate stored in the high-temperature water storage tank of the closed-loop condensate recovery scheme, and sends it to the heat exchanger through the high-temperature hot water output pipe to heat the curing area and the marshalling area. This realizes the condensate waste heat heating mode in the curing area and the marshalling area, which greatly reduces the energy consumption of the aerated concrete block and board production process. Attached Figure Description

[0013] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0014] Figure 1 This is a schematic diagram of the heating system structure of the autoclaved curing area (maintenance area) according to an embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the autoclaved marshalling yard heating system according to an embodiment of the present utility model;

[0016] Figure 3 Here is an example of a fan coil unit assembly. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0018] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] During the autoclaving stage, aerated concrete blocks or panels are fed into the autoclave for slow pressurization. High-pressure steam is introduced, and the autoclave is slowly pressurized, a process that lasts approximately 3 hours. When the pressure reaches 1.25 MPa, a pressure stabilization process begins, lasting approximately 8 hours until the autoclaving stage is complete. Afterward, a depressurization stage, also known as the steam venting stage, begins, lasting approximately 3 hours.

[0020] The autoclaving process produces a large amount of condensate. For example, in a complete autoclaving process, approximately 15 tons of condensate are produced, with a maximum discharge temperature of 190℃. Currently, condensate recovery systems are all open-loop systems, meaning a small condensate tank is built in front of the autoclave. Discharging such a large amount of high-temperature condensate into this small tank inevitably causes the condensate water temperature to rise (above 100℃), leading to secondary vaporization, which seriously impacts the environment and causes significant heat loss. Furthermore, to prevent secondary vaporization, cold water is usually continuously added, resulting in low condensate recovery temperatures in open-loop systems. Therefore, the current condensate utilization methods in the autoclave industry are mostly for winter heating and boiler feedwater preheating. Overall, the energy utilization rate of autoclave condensate is low, falling into the category of inefficient utilization.

[0021] To address the aforementioned drawbacks, a closed-loop condensate recovery system can be adopted. This system involves installing three drainage pipes in the condensate drain tank beneath the autoclave: one high-pressure condensate drain pipe, one low-pressure condensate drain pipe, and one open condensate drain pipe. The high-pressure condensate pipe from the drain tank merges into the high-pressure condensate main pipe, the low-pressure condensate pipe merges into the low-pressure condensate main pipe, and the atmospheric pressure (open) condensate pipe merges into the atmospheric pressure condensate main pipe. The high-pressure condensate main pipe delivers the high-temperature, high-pressure condensate from the autoclave to the high-temperature condensate recovery tank. The low-pressure and atmospheric pressure condensate main pipes deliver the low-temperature, low-pressure condensate from the autoclave to the low-temperature condensate recovery tank (which is unpressurized). In addition to collecting condensate, both the high-temperature and low-temperature condensate recovery tanks receive steam discharged from the autoclave via corresponding residual steam inlet pipes.

[0022] This invention utilizes the high-temperature condensate stored in the high-temperature water storage tank of the closed-loop condensate recovery scheme, and sends it to the heat exchanger through the high-temperature hot water output pipe to heat the curing area and the marshalling area. This realizes the condensate waste heat heating mode in the curing area and the marshalling area, which greatly reduces the energy consumption of the aerated concrete block and board production process.

[0023] Figure 1 This is a schematic diagram of the heating system structure for the autoclaved curing area (maintenance area) according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the autoclaved marshalling yard heating system according to an embodiment of the present invention. Figure 1 , 2As shown, the heating system includes: a heat exchanger (not shown), whose primary side is connected to a condensate recovery storage tank, and a heating interface 10 is provided on the secondary side. Preferably, the primary side of the heat exchanger is connected to a condensate recovery high-temperature water storage tank; a first branch main pipe 11 and a second branch main pipe 12 are respectively connected to the heating interface 10. The first branch main pipe 11 is used to supply high-temperature hot water to the marshalling area, and the second branch main pipe 12 is used to supply high-temperature hot water to the maintenance area; multiple first hot water branches 111 are provided in the marshalling area and multiple second hot water branches 121 are provided in the maintenance area. The first hot water branches 111 are respectively connected to the first branch main pipe 11, and the second hot water branches 121 are respectively connected to the second branch main pipe 12. Multiple fan coil units 13 are connected to each hot water branch. When the high-temperature hot water flows through the heat exchanger of the fan coil unit 13, forced convection heating is provided to the area under the action of the fan of the fan coil unit 13.

[0024] A fan coil unit is a type of heat exchanger with densely wound fins on the outside of pipes. It is widely used in civil buildings as a terminal heat dissipation device for heating and air conditioning systems, but rarely in industrial applications. Cold or hot water flows inside the pipes, and a fan at the rear of the coil pressurizes the air, allowing it to flow through the densely wound finned heat exchanger for heat exchange. When hot water flows inside the pipes, the fan blows out hot air; when cold water flows inside, the fan blows out cold air. For example, in one exemplary fan coil unit, a drive motor introduces gas through a fan impeller, and the gas is then introduced into the fan coil unit through an intake pipe. After the gas is converted to the required temperature by the heat exchanger, it is finally discharged from the fan coil unit through an exhaust mechanism.

[0025] Figure 3 This is a schematic diagram of a fan coil unit 13 connected to the hot water branch line. Figure 3 As shown, each fan coil unit assembly 13 includes two fan coil units 132 and 133 connected to the corresponding hot water branch via connecting pipe 131.

[0026] Unlike traditional autoclave manufacturing where steam heating (drying) in the resting and marshalling areas uses bare steel radiators, this invention uses fan coil unit terminal heat dissipation equipment. Because the fan coil unit has a fan inside, the traditional natural convection heating is changed to forced convection heating under the action of the fan, which enhances the heat dissipation capacity of the terminal (fan coil unit) equipment. This not only makes it possible to use hot water at a lower temperature to meet the higher ambient temperature requirements, but also makes the ambient temperature field in the resting and marshalling areas more uniform, which is better for the production process.

[0027] This invention replaces the traditional steam heating (drying) system for the curing and marshalling areas with high-temperature waste heat hot water heating (drying), fully embodying the principles of high-energy utilization and low-energy utilization, and significantly saving energy consumption in the heating (drying) of the autoclave curing and marshalling areas. Simultaneously, the hot water circulation system utilizes the high-temperature condensate generated during the autoclave's autoclaving process as its heat source, achieving a closed-loop energy system for the autoclave industry through a heat exchanger.

[0028] Continue to refer to Figure 1 As shown, in the heating system of the maintenance area, multiple second hot water branches 121 are connected in parallel at predetermined intervals on the second branch main pipe 12, and multiple fan coil units 13 are connected in parallel at predetermined intervals on each second hot water branch 121. The number of second hot water branches 121 and the number of fan coil units 13 connected to each second hot water branch 121 can be designed according to the area of ​​the maintenance area.

[0029] Continue to refer to Figure 2 As shown, in the heating system of the marshalling yard, two first hot water branches 111 are connected to the first branch main pipe 11 at predetermined intervals, and multiple fan coil units 13 are connected in parallel at predetermined intervals on each first hot water branch 111. The number of fan coil units 13 connected to each first hot water branch 111 can be designed according to the area of ​​the marshalling yard.

[0030] During operation, high-temperature condensate from the waste heat platform (e.g., a high-temperature condensate recovery tank) is controlled to enter each fan coil unit 13 in the marshalling yard via the first branch main pipe 11. Under the action of the fans in the fan coil units 13, forced convection heating is provided to the area. High-temperature condensate from the waste heat platform (e.g., a high-temperature condensate recovery tank) is controlled to enter each fan coil unit 13 in the maintenance area via the second branch main pipe 12. Under the action of the fans in the fan coil units 13, forced convection heating is provided to the area.

[0031] Each of the aforementioned pipelines includes both inlet and outlet pipelines, forming a closed-loop flow path for the entire system. Simultaneously, a closed-loop condensate recovery system is implemented using a heat exchanger.

[0032] It is understood that, although not explicitly stated, control valves may be installed on each pipeline of this invention as needed to control the flow or on / off state of the main branch, hot water branch, or connecting pipeline.

[0033] Although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Modifications or equivalent substitutions to the technical solutions of the embodiments of the present invention without departing from the inventive concept of the present invention shall not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste heat recovery heating system for autoclave condensate using fan coil unit assemblies, characterized in that, The heating system includes: a heat exchanger, the primary side of which is connected to a condensate recovery tank, and a heating interface (10) on the secondary side; a first branch main pipe (11) and a second branch main pipe (12) respectively connected to the heating interface (10), the first branch main pipe (11) being used to supply high-temperature hot water to the marshalling area, and the second branch main pipe (12) being used to supply high-temperature hot water to the maintenance area; multiple first hot water branches (111) set in the marshalling area, the first hot water branches (111) being connected to the first branch main pipe (11); and multiple second hot water branches (121) set in the maintenance area, the second hot water branches (121) being connected to the second branch main pipe (12), and multiple fan coil units (13) connected to the first hot water branches (111) and the second hot water branches (121). When the high-temperature hot water flows through the heat exchanger of the fan coil unit (13), forced convection heating is carried out on the area under the action of the fan of the fan coil unit (13).

2. The autoclave condensate recovery waste heat heating system according to claim 1, characterized in that, Multiple second hot water branches (121) are connected in parallel at predetermined intervals on the second branch main pipe (12), and multiple fan coil units (13) are connected in parallel at predetermined intervals on each second hot water branch (121).

3. The autoclave condensate recovery waste heat heating system according to claim 1, characterized in that, The first branch main pipe (11) is connected to two first hot water branches (111) at a predetermined distance, and each first hot water branch (111) is connected in parallel to multiple fan coil units (13) at a predetermined distance.

4. The autoclave condensate recovery waste heat heating system according to claim 2 or 3, characterized in that, Each fan coil unit assembly (13) includes two fan coil units (132, 133) connected to the corresponding hot water branch via connecting pipes (131).

5. The autoclave condensate recovery waste heat heating system according to claim 4, characterized in that, The connecting pipe (131) includes an input connecting pipe and an output connecting pipe.

6. The autoclave condensate recovery waste heat heating system according to claim 5, characterized in that, Control valves are installed on both the input and output connection lines.

7. The autoclave condensate recovery waste heat heating system according to claim 1, characterized in that, The heating interface (10) is connected to the high-temperature water storage tank for the autoclaved condensate recovery.

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