Casting waste heat utilization system

Abstract

The utility model discloses a casting waste heat utilization system which comprises a casting heat removal area, a water collector, a heat exchanger and a water segregator, a heat removal pipeline is arranged in the casting heat removal area, and one end of the heat removal pipeline is connected with a water inlet of the water collector; a water outlet of the water collector is connected with a heat exchanger in the waste heat utilization area through a water outlet pipeline, high-temperature water in the water outlet pipeline is changed into low-temperature water after heat exchange is carried out on the high-temperature water in the water outlet pipeline and air in the waste heat exchange area through the heat exchanger, and the low-temperature water enters the water segregator through a water return pipeline and a first circulating pump; and a water outlet of the water segregator is connected with the other end of the heat removal pipeline. The iron casting waste heat is recycled and then led into the iron casting paint drying room to be utilized, original natural gas is replaced, natural gas energy is saved, energy is saved, and carbon is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of casting waste heat recovery, in particular to a casting waste heat utilization system. Background Art

[0002] The original foundry produced iron castings using the V-method casting process in an open-air workshop. After pouring, the temperature of the castings remained around 650°C after unpacking. These castings naturally cooled to room temperature, leaving no heat dissipation and wasting the waste heat. The iron castings were transported manually using forklifts, creating a poor working environment. The high temperatures and dusty atmosphere inside the cooling shed created a high workload, endangering employee health. This also resulted in environmental pollution and smoke and dust pollution from the cooling process and worker handling. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the present invention provides a casting waste heat utilization system. The technical problems to be solved by the present invention are achieved through the following technical solutions:

[0004] A casting waste heat utilization system includes a casting heat extraction area, a water collector, a heat exchanger and a water distributor. A heat extraction pipe is provided in the casting heat extraction area, and one end of the heat extraction pipe is connected to the water inlet of the water collector; the water outlet of the water collector is connected to the heat exchanger in the waste heat utilization area through the water outlet pipe. The heat exchanger is used to exchange heat between the high-temperature water in the water outlet pipe and the air in the waste heat exchange area, so that the high-temperature water in the water outlet pipe is converted into low-temperature water and enters the water distributor through the return pipe and the first circulation pump; the water outlet of the water distributor is connected to the other end of the heat extraction pipe.

[0005] Furthermore, the casting heat extraction zone includes a conveying device and a heat insulation cover that encloses the conveying device. The castings to be transferred are located on the conveying device. The heat extraction pipe is located in the heat insulation cover and absorbs the heat radiated by the castings.

[0006] Preferably, the conveying device has a length of 50-60 m, the heat shield has a length of 50-60 m, a width of 1.5-2.5 m, and a height of 1.5-2.5 m.

[0007] Furthermore, one end of the heat extraction pipe is connected to the water inlet of the water collector through a first pipe, and the other end is connected to the water outlet of the water distributor through a second pipe. A first valve is provided on the first pipe; a second valve is provided on the second pipe; and a third pipe and a third valve are provided between the first pipe and the second pipe.

[0008] Furthermore, a second circulating pump is connected in parallel to the first circulating pump, and fourth valves are provided on the return pipes at both ends of the first circulating pump and the second circulating pump.

[0009] Beneficial effects of the utility model:

[0010] 1. This utility model recovers the waste heat from iron castings and leads it to the iron casting paint drying room for utilization, replacing the original natural gas, saving natural gas energy and reducing energy and carbon emissions;

[0011] 2. The utility model uses a conveying device to transport iron castings and automates mechanical operations, thereby improving the working environment of workers and protecting their health. At the same time, by arranging a heat insulation cover on the conveying device, the smoke and dust generated during the cooling process of the iron castings and the operation process of the workers can be isolated, reducing atmospheric smoke pollution and improving the factory's atmospheric environment.

[0012] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the present utility model.

[0014] Description of reference numerals:

[0015] 1- small iron casting heating area; 2- medium iron casting heating area; 3- water collector; 4- heat exchanger; 5- water distributor; 6- heat extraction pipe; 7- first pipe; 8- outlet pipe; 9- return pipe; 10- first circulation pump; 11- second pipe; 12- conveying device; 13- third pipe; 14- third valve; 15- first valve; 16- second valve; 17- second circulation pump; 18- fourth valve. DETAILED DESCRIPTION

[0016] The present invention will be described in further detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0017] See Figure 1The present invention provides a waste heat recovery system for solid iron castings produced using a V-casting process. The waste heat generated by these solid iron castings, including small and medium-sized castings, is used to dry paint on the castings within a paint drying room. The original heat source for the drying room, which heated air by burning natural gas, is now replaced by heat generated by recovered waste heat from the castings. The casting waste heat utilization system specifically includes a small iron casting heat extraction zone 1, a medium iron casting heat extraction zone 2, a water collector 3, a heat exchanger 4 and a water distributor 5. The small iron casting heat extraction zone 1 and the medium iron casting heat extraction zone 2 are both provided with a heat extraction pipe 6. One end of the two heat extraction pipes 6 is connected to the water inlet of the water collector 3 through their respective first pipes 7. The water in the heat extraction pipe 6 absorbs heat from the small iron casting heat extraction zone 1 and the medium iron casting heat extraction zone 2 and becomes high-temperature water. It enters the water collector 3 from one end of the corresponding heat extraction pipe 6 and merges; the water outlet of the water collector 3 is connected to the heat exchanger 4 in the casting paint drying room through the outlet pipe 8. The high-temperature water The water enters the heat exchanger 4 through the outlet pipe 8. The heat exchanger 4 exchanges heat between the high-temperature water in the outlet pipe 8 and the air in the paint drying room for castings, so that the original room-temperature air in the paint drying room for castings becomes hot air, which dries the paint on the surface of the castings. The high-temperature water in the original outlet pipe 8 becomes low-temperature water and enters the water distributor 5 through the return pipe 9 and the first circulation pump 10. The water outlet of the water distributor 5 is connected to the other end of the two heat extraction pipes 6 through two second pipes 11 respectively. The low-temperature water in the water distributor 5 enters the respective heat extraction pipes 6 again through their respective second pipes 11 for another heat absorption cycle.

[0018] Furthermore, the small iron casting heat extraction zone 1 and the medium iron casting heat extraction zone 2 each include a conveyor 12 and a heat shield (not shown) enclosing the conveyor 12. The heat shield is open at both ends, and the casting to be transferred is located on the conveyor 12. The heat extraction pipe 6 is located within the heat shield and absorbs the heat radiated from the casting. The conveyor 12 can be a device commonly used for transferring parts in a factory, such as a conveyor belt, or other conveyor devices with similar functions to a conveyor belt. The conveyor belt can automatically transfer castings, improve the workers' working environment, and protect their health. At the same time, the heat shield can isolate the smoke and dust generated by the cooling process of the castings and the workers' operation process, thereby improving the factory's atmospheric environment.

[0019] Furthermore, to ensure the cooling rate of the iron castings and prevent cracking caused by excessive cooling, while also meeting the temperature requirements of the paint drying room for the castings, the conveyor 12 is designed to be 55 meters long. The corresponding heat shield is also 55 meters long, 2 meters wide, and 2 meters high. In actual production, the temperature of small and medium castings after demolding is approximately 600°C. After absorbing heat through the 55-meter-long conveyor 12, the temperature drops to approximately 240°C, a temperature difference of 360°C. The initial cold water absorbs heat multiple times, bringing the temperature before and after passing through the heat exchanger 4 to 70°C. After heat exchange in the heat exchanger 4, the heat generated is used to dry the paint on the casting surface. After heat exchange, the 70°C high-temperature water is reduced to 50°C and returned to the water distributor 5 for recycling. Excess hot water can also be used for other production and living purposes.

[0020] Furthermore, in order to adjust the temperature of the water flowing out of the water collector 3 and ensure that the water temperature before entering the heat exchanger 4 can reach the set 70°C, so that the temperature will not be too high and the paint on the casting will dry too quickly, causing the paint surface to crack, a third pipe 13 and a third valve 14 are arranged between the first pipe 7 and the second pipe 11; when the temperature of the water entering the water collector 3 is too high, the third valve 14 is opened, so that the low-temperature water flowing out of the water distributor 5 flows out from the third pipe 13 and mixes with the high-temperature water flowing out of the heat extraction pipe 6, thereby reducing the water temperature of the water entering the water collector 3.

[0021] In addition, in order to facilitate maintenance, a first valve 15 is provided on the first pipe 7; a second valve 16 is provided on the second pipe 11. When a water leakage accident occurs in the heat extraction pipe 6, the first valve 15 and the second valve 16 are closed to stop the operation, thereby facilitating maintenance.

[0022] Furthermore, a second circulating pump 17 is connected in parallel to the first circulating pump 10, and a fourth valve 18 is provided on the return pipe 9 at both ends of the first circulating pump 10 and the second circulating pump 17. When a problem occurs with either circulating pump, it is only necessary to close the fourth valve 18, repair it, and open the valve of one circulating pump to enable the other circulating pump to operate normally.

[0023] After calculation, the benefits of using the solution of this utility model are: 2691MJ of heat can be recovered per hour, and about 4.82 million cubic meters of natural gas can be saved annually. 3 Calculated based on the price, it can save 1.52 million yuan, save 550tce of carbon consumption annually, and reduce carbon dioxide emissions by 91t annually.

[0024] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A casting waste heat utilization system, characterized in that: It includes a casting heat extraction area, a water collector, a heat exchanger and a water distributor. A heat extraction pipe is provided in the casting heat extraction area, and one end of the heat extraction pipe is connected to the water inlet of the water collector; the water outlet of the water collector is connected to the heat exchanger in the waste heat utilization area through the water outlet pipe. The heat exchanger is used to exchange heat between the high-temperature water in the water outlet pipe and the air in the waste heat exchange area, so that the high-temperature water in the water outlet pipe is converted into low-temperature water and enters the water distributor through the return pipe and the first circulation pump; the water outlet of the water distributor is connected to the other end of the heat extraction pipe.

2. The casting waste heat utilization system according to claim 1, characterized in that: The casting heat extraction zone includes a conveying device and a heat insulation cover that encloses the conveying device. The casting to be transported is located on the conveying device. The heat extraction pipeline is located in the heat insulation cover and absorbs the heat radiated by the casting.

3. The casting waste heat utilization system according to claim 2, characterized in that: The conveying device has a length of 50-60 m, the heat insulation cover has a length of 50-60 m, a width of 1.5-2.5 m, and a height of 1.5-2.5 m.

4. The casting waste heat utilization system according to claim 1, characterized in that: One end of the heat extraction pipe is connected to the water inlet of the water collector through a first pipe, and the other end is connected to the water outlet of the water distributor through a second pipe. A first valve is provided on the first pipe; a second valve is provided on the second pipe; a third pipe and a third valve are provided between the first pipe and the second pipe.

5. The casting waste heat utilization system according to claim 1, characterized in that: The first circulating pump is connected in parallel with a second circulating pump, and return pipes at both ends of the first circulating pump and the second circulating pump are both provided with fourth valves.

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