Hydrophobic waste heat recycling heating device for zinc hydrometallurgy steam pipe network

Abstract

The utility model relates to the technical field of waste heat recycling, and discloses a zinc hydrometallurgy steam pipe network drainage waste heat recycling heating device which comprises a hot water circulating tank communicated with a steam pipe network drainage pipeline, and a water outlet pipeline is arranged at the bottom of the hot water circulating tank. The water outlet pipeline is communicated with the cooling fins of the heating points of all the areas through the circulating pump set, and water outlets of the cooling fins of the heating points of all the areas are communicated with the hot water circulating tank through the water return pipeline. On the basis of an original steam drainage device, the hot water circulating tank and the circulating pump set are additionally arranged, waste heat waste caused by the service life of a steam drainage valve and the like is effectively prevented, the winter heating problem existing along with production process adjustment and the like is solved, meanwhile, the production cost can be effectively reduced, and the production efficiency is improved. And the safety risk caused by steam leakage is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a heating device for recovering waste heat from the condensate drain of a wet zinc smelting steam pipeline network. Background Technology

[0002] In the traditional hydrometallurgical zinc smelting industry, the hydrometallurgical system mainly includes processes such as zinc roasting leaching, purification of the middle and supernatant, and electrowinning of the new solution. The reaction temperatures required for processes such as zinc roasting acid leaching, iron removal by alum precipitation, cobalt and nickel removal through purification, and comprehensive recovery of purified slag are all supplied by steam generated from waste heat boilers in the pyrometallurgical roasting and slag treatment system. To avoid problems such as unstable or discontinuous steam supply from a single waste heat boiler due to various factors, a steam pipeline network is typically configured throughout the hydrometallurgical zinc smelting system, connecting all steam usage points to ensure a continuous, uniform, and stable supply of steam for the production process. However, due to objective factors such as the characteristics of the plant site's topography and the connection between processes, the layout of the steam pipeline network in the hydrometallurgical zinc smelting system inevitably involves changes in pipeline routing and the existence of lowest points. Therefore, the use of steam pipeline condensate drains is indispensable. Furthermore, due to limitations in the lifespan of condensate drain valves and maintenance conditions, hydrometallurgical zinc smelting enterprises inevitably experience some degree of waste heat steam leakage due to condensate drain valve malfunctions. This not only wastes energy but also poses a safety risk of steam burns. On the other hand, the original design of the zinc smelting system was to supplement the steam shortage required for production and the steam for winter heating in the plant area by starting up coal-fired boilers. However, as old coal-fired boilers were listed as high-energy-consuming equipment to be phased out by the state, and measures such as building new gas-fired boilers could not be fully implemented due to geographical limitations, the problem of steam shortage in wet production became increasingly serious. At the same time, with the increasingly stringent national environmental protection policies and the development of wet zinc smelting technology, some enterprises have made up for the production steam shortage by improving the zinc smelting process and operating the pyrometallurgical zinc slag treatment system. Although this method can barely guarantee the steam required for normal production, the surplus heat steam is used for winter heating. Therefore, the heating problem for work and life in the plant area in winter still exists. If electricity-consuming heating is used, it will increase production costs and is no longer advisable. Summary of the Invention

[0003] The purpose of this invention is to provide a heating device for reusing the waste heat from the steam pipeline network in wet zinc smelting, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A heating device for utilizing waste heat from the steam pipeline network in wet zinc smelting includes a hot water circulation tank connected to the steam pipeline network's drainage pipe. The bottom of the hot water circulation tank is provided with an outlet pipe, which is connected to the radiators of each heating point in the area via a circulation pump set. The outlet of the radiator of each heating point in the area is connected to the hot water circulation tank via a return water pipe.

[0006] The bottom of the hot water circulation tank is also equipped with a sewage pipe, which is connected to the sewage treatment workshop. A sewage valve is installed on the sewage pipe.

[0007] The hot water circulation tank is connected to the steam network drainage pipe through an inlet pipe, and a drainage valve is installed on the steam network drainage pipe.

[0008] The end of the water inlet pipe extends into the bottom of the hot water circulation tank, and the end of the water inlet pipe is equipped with a "wolf's tooth" style multi-hole steam nozzle.

[0009] The water inlet pipe is made of DN25 steel pipe.

[0010] The hot water circulation tank is located in the air compressor room, near the steam pipe network drainage pipe.

[0011] The circulating pump set includes at least two hot water circulating pumps connected in parallel.

[0012] Valves are installed between the hot water circulation pump and the hot water circulation tank, and between the hot water circulation tank and the radiators of each area's heating point.

[0013] The water outlet pipe uses a DN65 PPR insulated pipe.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0015] Based on the original steam trap device, this utility model effectively prevents the waste of residual heat caused by the service life of the steam trap valve by adding a hot water circulation tank and circulation pump group. It also solves the winter heating problem caused by the adjustment of production process, while effectively reducing production costs, effectively avoiding the safety risks of steam leakage, and realizing the reuse of steam trap energy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, this utility model provides a heating device for utilizing the waste heat from the steam condensate drain of a wet zinc smelting steam pipeline, comprising the following: After the drain valve in the steam condensate drain pipe of the wet zinc smelting steam pipeline, a DN25 flange is used to connect and transport the steam condensate to an effective volume of 8m³. 3 In a cylindrical hot water circulation tank, a DN25 steel pipe is inserted as the inlet pipe into the bottom of the hot water circulation tank below the liquid level. A multi-hole steam nozzle in the shape of a "wolf's tooth" is installed at the end of the inlet pipe to fully mix with the circulating water by utilizing the pressure of the steam condensate.

[0020] The hot water circulation tank is placed in the air compressor room, near the steam condensate pipes. In winter, the higher indoor temperature of the air compressor room is utilized to reduce heat loss. The outer wall of the hot water circulation tank is insulated to further reduce heat loss and maintain the circulating water temperature as high as possible. The connected steam network continuously heats the circulating water in the tank. The heated circulating water is pumped through a pump connected to the bottom of the tank with a head of 30m and a flow rate of 2.5m³ / h. 3 The circulating pump delivers water to the radiators in each heating area at a rate of / h.

[0021] The bottom of the hot water circulation tank is equipped with a circulation pump set consisting of at least two hot water circulation pumps connected in parallel, with one pump operating and one on standby (or multiple on standby), enabling automatic control and ensuring continuous operation during winter heating. The radiators are connected in series. Circulating water passes through each heating point sequentially and then enters the hot water circulation tank through a return pipe. The return pipe extends below the circulating water surface in the tank. The pressure of the circulation pump further mixes the steam condensate, circulating water, and the circulating water flowing through the heating points, ensuring a stable and uniform circulating water temperature. The inlet pipe and the connection to the radiators at each heating point use DN25 steel pipes. Both the outlet and return pipes can be made of DN65 PPR insulated pipes, which can significantly reduce heat loss during the circulating hot water transportation process and achieve the heating goal.

[0022] Because the steam condensate is softened water from the waste heat boiler, it effectively prevents scaling in pipes and radiators, ensuring long-term operation. A drain pipe with a drain valve is installed at the bottom of the hot water circulation tank. By periodically discharging rust and other debris deposited at the bottom of the tank, and removing excess circulating water after the steam condensate is added, the water level in the hot water circulation tank can be kept stable. The drain pipe connects to a wastewater collection pipe, and the collected wastewater is then treated in the wastewater treatment plant.

[0023] After our company connected the steam pipeline network to this steam condensate waste heat recovery device, it was able to utilize the steam condensate waste heat in 40 office rooms, covering approximately 600 square meters. 2 The office's winter heating system maintains the office temperature at around 20°C, saving approximately 57,600 kWh of electricity and about 23,000 yuan in electric heating costs. It also effectively eliminates the safety risk of steam overflow in the event of a steam trap malfunction, and enables the reuse of steam trap energy.

Claims

1. A wet zinc hydrometallurgy steam pipe network drain heat reutilization heating device, characterized in that: It includes a hot water circulation tank connected to the steam network drainage pipe. The bottom of the hot water circulation tank is provided with a water outlet pipe. The water outlet pipe is connected to the radiator of each heating point in the area through a circulation pump set. The water outlet of the radiator of each heating point in the area is connected to the hot water circulation tank through a return water pipe.

2. The wet zinc hydrometallurgy steam pipe network drain heat reutilization heating device according to claim 1, characterized in that: The bottom of the hot water circulation tank is also equipped with a sewage pipe, which is connected to the sewage treatment workshop. A sewage valve is installed on the sewage pipe.

3. The wet zinc hydrometallurgy steam pipe network drain heat reutilization heating device according to claim 1, characterized in that: The hot water circulation tank is connected to the steam network drainage pipe through an inlet pipe, and a drainage valve is installed on the steam network drainage pipe.

4. The wet zinc hydrometallurgy steam pipe network drain heat reutilization heating device according to claim 3, characterized in that: The end of the water inlet pipe extends into the bottom of the hot water circulation tank, and the end of the water inlet pipe is equipped with a "malle club" type of multi-hole steam nozzle.

5. The wet zinc hydrometallurgy steam pipe network drain heat reutilization heating device according to claim 4, characterized in that: The water inlet pipe is made of DN25 steel pipe.

6. The wet zinc process steam pipe network drain heat recovery heating device according to claim 1, characterized in that: The hot water circulation tank is located in the air compressor room, near the steam pipe network drainage pipe.

7. The wet zinc hydrometallurgy steam pipe network drain heat reutilization heating device according to claim 1, characterized in that: The circulating pump set includes at least two hot water circulating pumps connected in parallel.

8. The wet zinc hydrometallurgy steam pipe network drain heat reutilization heating device according to claim 7, characterized in that: Valves are installed between the hot water circulation pump and the hot water circulation tank, and between the hot water circulation tank and the radiators of each area's heating point.

9. The wet zinc hydrometallurgy steam pipe network drain heat reutilization heating device according to claim 1, characterized in that: The water outlet pipe uses a DN65 PPR insulated pipe.

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