CN204944243U - Replaceable coiled electrolysis flue gas waste heat recovery heat-exchanger rig - Google Patents

Abstract

The utility model belongs to the technical field of waste heat recycling of colored high-temperature electrolytic flue gas, in particular to a replaceable coil type electrolytic flue gas waste heat recovery heat exchange device. The heat exchange device is composed of a heat exchange shell, a replaceable heat exchange coil, a hosting bracket, a horizontal water inlet pipe, a horizontal water outlet pipe, a water inlet main pipe, a water outlet main pipe, a safety valve, a movable upper cover, and flange components. The replaceable heat exchange coils can be set in multiple groups, and the hosting bracket is set in the heat exchange shell, and is fixed on the hosting bracket in parallel, and the water inlet and outlet horizontal pipes are connected with the water inlet and outlet main pipes. The advantages are: the waste heat of the electrolysis flue gas is fully recycled, the annual natural gas cost is saved by more than 1.84 million yuan, the purchase and maintenance costs are reduced, the structure is simple, the production and use are convenient, the cost is low, and the replaceable heat exchange coil can be disassembled , Maintenance and overhaul are convenient, save equipment maintenance costs, and have little impact on normal production.

Description

Replaceable coil type electrolytic flue gas waste heat recovery heat exchange device

Technical field :

The utility model belongs to the technical field of waste heat recovery and utilization of colored high-temperature electrolytic flue gas, in particular to a replaceable coil type electrolytic flue gas waste heat recovery heat exchange device.

Background technology :

In the electrolytic aluminum industry, several known companies have used rectangular preheat exchangers. By welding multiple sets of parallel heat exchange tubes to the rectangular preheat exchangers, and making them on the outer surface of the heat exchange tubes Multiple fins are used to increase the heat transfer area of the heat exchange tube, and the high temperature flue gas is used to heat the cold water for waste heat recovery and utilization. The disadvantage of this rectangular heat exchanger is: the welding of the heat exchange tube and the rectangular container device is fixed, so the production can only be stopped for a long time when the heat exchange tube is replaced each time, the cost of one replacement is relatively large, and it will bring a negative impact on production. If the installation of a bypass flue can ensure normal production, it will require a large additional input cost; the manufacturing process of the heat exchange tube is complicated, and the cost of special materials is high, and the heat transfer area of the fins is also large. It is not ideal. At the same time, the current finned tube has a short water stroke and poor heat transfer effect. In addition, the fins also form a large resistance to the flow of flue gas during the heat exchange process of flue gas, resulting in more dust hanging and accumulation. , In addition to the erosion and erosion of high-temperature corrosion flue gas, the corrosion and damage of finned heat exchange tubes are further aggravated.

Invention content :

The purpose of this utility model is to aim at the above-mentioned shortcomings existing in the prior art, and to develop a replaceable coil type electrolytic flue gas waste heat recovery heat exchange device with simple structure, convenient operation and replacement, advanced science, economical and practical, the heat exchange device The above disadvantages brought by the prior art can be effectively overcome, the waste heat recovery effect of the flue gas is greatly improved, and the economic and social benefits are very obvious.

The technical solution is: the replaceable coil type electrolytic flue gas waste heat recovery heat exchange device is characterized in that it consists of a heat exchange shell, a replaceable heat exchange coil, a hosting bracket, a horizontal water inlet pipe, a horizontal water outlet pipe, a water inlet Main pipeline, water outlet main pipeline, safety valve, movable upper cover, and flange components. The outer surface of the replaceable heat exchange coil is smooth without fins. The replaceable heat exchange coil can be set in multiple groups, which can Replaceable heat exchange coils are evenly distributed in the heat exchange shell, and the hosting bracket is set in the heat exchange shell. The replaceable heat exchange coils are fixed on the hosting bracket in parallel, and the replaceable heat The water inlet of the heat exchange coil is connected to the horizontal water inlet pipe through flange sealing, and the water outlet of the replaceable heat exchange coil is connected to the horizontal water outlet pipe through flange sealing. The pipes are connected, and the horizontal water outlet pipe is connected with the main water outlet pipe. In order to ensure the safe use of the device, a safety valve can be provided on the main water inlet pipe and the main water outlet pipe. The heat exchange shell is the main body of the heat exchange device of the present invention. It is an object for installing and fixing the various parts. The upper part of the heat exchange shell is provided with a movable upper cover. In order to prevent the waste heat and smoke from overflowing, the movable upper cover must be well sealed. . When replacing the replaceable heat exchange coil in the heat exchange shell, the movable upper cover can be opened. If the replaceable heat exchange coil is replaced, remove the flange of the fixed replaceable heat exchange coil, and pass through the upper The lifting device is used to lift out the replaceable heat exchange coils that need to be replaced, and then replace them, so the heat exchange shell is an item that is permanently used and does not need to be replaced. However, the heat exchange shell and the heat exchange pipe of the heat exchange device in the existing industry are integrated, so they must be replaced together, and the cost of equipment replacement is relatively high. The replaceable heat exchange coil is a part of the heat exchange medium water channel. Its outer surface is smooth without fins, which is easy to manufacture and reduces the erosion of airflow resistance, thus prolonging its service life. The replaceable heat exchange coil is fixed on the hosting bracket in parallel. The water inlet of the replaceable heat exchange coil is connected to the horizontal water inlet pipe through flange sealing. The water outlet of the replaceable heat exchange coil It is connected to the horizontal outlet pipe through flange sealing. Since the water outlet and water inlet of the replaceable heat exchange coil are connected through flange sealing, it can be disassembled and replaced as needed. The time is very short, so the impact on production is minimal. The hosting bracket is the part that fixes the replaceable heat exchange coil. The horizontal water inlet pipe is the connection between the main water inlet pipe and the water inlet of the replaceable heat exchange coil. It is fixed on the heat exchange shell. The connecting piece, which is fixed on the heat exchange shell. The water inlet main is the main pipe for cold water input. The main water outlet pipe is the main pipe for the output of hot water after heating. When the replaceable coil type electrolytic flue gas waste heat recovery heat exchange device is in use, the replaceable heat exchange coil is filled with heat transfer medium water, and the outside of the replaceable heat exchange coil is electrolyzed with high temperature waste heat flue gas, water and electrolyzed high temperature waste heat smoke The gas exchanges heat in the flow to achieve the purpose of recycling waste heat.

The utility model can replace the coil-type electrolytic flue gas waste heat recovery heat exchange device. Each group of heat exchange tubes adopts a disc-shaped heat exchange tube. The head end is a water inlet pipe, and the tail end is a water outlet pipe. The pipe wall is a smooth stainless steel round pipe, which reduces the flow resistance and dust accumulation of the electrolytic flue gas. The flange connection not only guarantees the airtightness, but also is easy to replace. It is economical and practical to replace a damaged set with a set, which greatly reduces the replacement cost and ensures normal production. Multiple sets of replaceable heat exchange coils are connected end-to-end through two sets of water inlet and outlet pipes welded on both sides of the heat exchange shell, and each set of replaceable heat exchange coil water inlet pipes is set as one. It is connected to the main water inlet pipe on one side of the heat exchange shell, and the water outlet pipe of each group of replaceable heat exchange coils is set as one, which is connected to the main water outlet pipe on the other side of the heat exchange shell, so as to achieve a good heat exchange effect and meet the Company's entire shower, heating and hot water needs.

The utility model has the advantages of fully recycling the waste heat of the flue gas in the production process of electrolytic aluminum. According to the actual application and measurement of the company, according to the analysis of the previous gas statistical data, the annual saving of natural gas costs is more than 1.84 million yuan. Due to the use of this device, our company canceled two gas-fired boilers at the same time, which reduced the purchase and maintenance costs of the equipment; in addition, due to the simple structure of the device, it is easy to manufacture and use, and the cost is low; It can be disassembled, maintained, and overhauled at any time as needed. When replacing, the heat exchange shell does not need to be replaced, and the replaceable heat exchange coil that needs to be replaced can be replaced directly. It can be retained, which saves equipment maintenance costs, and the replacement time is greatly shortened, with little impact on normal production.

Description of drawings:

Fig. 1 is a structural schematic diagram of a replaceable coil type electrolytic flue gas waste heat recovery heat exchange device of the present invention.

In Fig. 1: 1. Heat exchange shell; 2. Replaceable heat exchange coil; 3. Hosting support; 4. Horizontal water inlet pipe; 5. Horizontal water outlet pipe; 6. Water inlet main pipe; 7. Water outlet main pipe ; 8. Safety valve; 9. Activity cover; 10. Flange. A detailed description will be given below in conjunction with the embodiments.

Specific implementation methods :

Embodiment 1: Fig. 1 is a structural schematic diagram of an embodiment of a replaceable coil type electrolytic flue gas waste heat recovery heat exchange device of the present invention. The replaceable coil type electrolytic flue gas waste heat recovery heat exchange device consists of a heat exchange shell (1), a replaceable heat exchange coil (2), a hosting bracket (3), a horizontal water inlet pipe (4), and a horizontal water outlet pipe ( 5), the main water inlet pipe (6), the main water outlet pipe (7), the safety valve (8), the movable upper cover (9), and the flange (10) are composed of components, and the replaceable heat exchange coil (2) The outer surface is smooth without fins, replaceable heat exchange coils (2) in this embodiment can be set to 10 groups, replaceable heat exchange coils (2) are evenly distributed in the heat exchange shell (1), hosting The bracket (3) is set in the heat exchange shell (1), the replaceable heat exchange coil (2) is fixed on the hosting bracket (3) in parallel, and the replaceable heat exchange coil (2) fixed on the hosting bracket (3) The water inlet of the heat exchange coil (2) is connected to the horizontal water inlet pipe (4) through the flange (10), and the water outlet of the replaceable heat exchange coil (2) is sealed through the flange (10). The method is connected with the horizontal water outlet pipeline (5), the horizontal water inlet pipeline (4) is connected with the water inlet main pipeline (6), and the horizontal water outlet pipeline (5) is connected with the water outlet main pipeline (7). In order to ensure the safe use of the device, a safety valve (8) can be provided on the main water inlet pipe (6) and the main water outlet pipe (7). A movable upper cover (9) is arranged on the upper part of the heat exchange shell (1).

Claims (2)

1. A replaceable coil type electrolytic flue gas waste heat recovery heat exchange device, which is characterized in that it consists of a heat exchange shell, a replaceable heat exchange coil, a hosting bracket, a horizontal water inlet pipe, a horizontal water outlet pipe, a water inlet main The outer surface of the replaceable heat exchange coil is smooth without fins. The replaceable heat exchange coil can be set in multiple groups, and the replaceable heat exchange coil is evenly distributed in the heat exchange area. In the shell, the hosting bracket is set in the heat exchange shell, and the replaceable heat exchange coil is fixed on the hosting bracket in parallel, and the water inlet of the replaceable heat exchange coil fixed on the hosting bracket is sealed by a flange The water outlet of the replaceable heat exchange coil is connected to the horizontal water outlet pipe by way of flange sealing, the horizontal water inlet pipe is connected to the main water inlet pipe, and the horizontal water outlet pipe is connected to the main water outlet pipe . 2. The replaceable coil type electrolytic flue gas waste heat recovery heat exchange device according to claim 1, characterized in that safety valves are provided on the main water inlet pipe and the main water outlet pipe.