CN201074869Y - Device for supplying heat using sulfuric acid production low temperature waste heat - Google Patents

Abstract

The utility model belongs to the field of devices for utilizing waste heat, which particularly relates to a temperature-regulated device which heats by utilizing sulfate to produce low-temperature residual heat. The utility model comprises an acid cooler which comprises a tube side and a shell side, wherein the shell side is connected with a sulfate inlet tube and a sulfate outlet tube, the tube side is connected with a circulating water inlet tube and a circulating water outlet tube which are evenly provided with valves. The utility model is characterized in that the tube side of the acid cooler is further connected with a heating device through a pipeline, which recovers and utilizes the low-temperature residual heat in producing sulfate, and saves the power source and cost which are needed in heating, and has he advantages of saving energy and reducing consumption, and convenient maintenance, and is convenient to improve the prior arts.

Description

A device that uses sulfuric acid to produce low-temperature waste heat for heating

technical field

The utility model belongs to the field of waste heat utilization equipment, in particular to a device for heating by using sulfuric acid to produce low-temperature waste heat.

Background technique

In China, sulfuric acid production includes sulfuric acid production, pyrite acid production, and smelting flue gas production of acid. Most of the above-mentioned acid production methods adopt relatively advanced two-turn and two-absorption acid production processes. During the acid production process, chemical reactions The heat generated is considerable, and fully recovering and utilizing this heat is an important task in the sulfuric acid manufacturing industry. In the two-rotation and two-suction acid production process, the waste heat at 800-1000°C during the roasting process is usually called high-temperature waste heat, about Accounting for 60% of the total waste heat, the waste heat around 500°C in the conversion process is called medium-temperature waste heat, accounting for about 15% of the total waste heat, and the waste heat around 100°C in the dry absorption process is called low-temperature waste heat, accounting for about 10% of the total waste heat. 25%, high-temperature waste heat and medium-temperature waste heat are relatively easy to recycle because of their high temperature, low-temperature waste heat has a low temperature, and the acid temperature is related to the concentration of acid, such as in pyrite acid production, the concentration of primary acid and secondary acid is 98%, the acid temperature is about 100°C, the concentration of dry acid is 93%, and the acid temperature is about 70°C; The temperature is around 100°C. Due to the difficulty of recovery, most sulfuric acid manufacturers do not recover low-temperature waste heat. Generally, the generated acid with low-temperature waste heat flows through the acid cooler to exchange heat with circulating cold water to cool down. This will not only prevent low-temperature waste heat from being obtained Utilize, and in order to reduce the temperature of acid, also need to use a large amount of cold water, both wasted energy, wasted water source again.

Contents of the invention

The purpose of the utility model is to provide an energy-saving and consumption-reducing device that utilizes sulfuric acid to produce low-temperature waste heat for heating.

The utility model is realized through the following technical solutions: namely, a device for heating by using sulfuric acid to produce low-temperature waste heat, including an acid cooler, the acid cooler is divided into a tube side and a shell side, and the shell side is connected with the acid inlet pipe and the acid outlet pipe. The pipe is connected with the circulating water inlet pipe and the circulating water outlet pipe, and the circulating water inlet pipe and the circulating water outlet pipe are equipped with valves. It is characterized in that the pipe side of the acid cooler is also connected to the heating device through the pipeline.

The acid cooler is an anode-protected shell-and-tube acid cooler, and the heating system includes a hot water tower, a cooling device, and a warm water tower; Tube side connection, the warm water tower is connected to the tube side of the anode protection shell-and-tube acid cooler through the heating water temperature pipe, the heating water hot water pipe and the heating water temperature water pipe are equipped with valves, and the hot water tower and the cooling device are connected through pipelines , a hot water pump is arranged on the pipeline, the cooling device and the warm water tower are connected through pipelines, a warm water pump is arranged on the heating water warm water pipe, and the warm water tower is connected with the heating circulating water replenishment tower through pipelines. If the heat supplied to the heating circulating water by low-temperature waste heat is equal to the heat lost by the heating circulating water, the above settings can be used for heating. When the heating circulating water is lost, an appropriate amount of heating can be added to the warm water tower through the heating circulating water replenishment tower Just circulate the water.

The hot water tower is connected with the heating circulating water warming device through pipelines, a connecting pipe is arranged between the hot water tower and the warm water tower, and a valve is arranged on the connecting pipe. When the heat supplied to the heating circulating water by low-temperature waste heat is less than the heat lost by the heating circulating water, or when the sulfuric acid production equipment is temporarily stopped, in order to ensure heating, the heating circulating water can be heated by the heating circulating water warming device for auxiliary heating. The heating circulating water heating device can be the steam boiler commonly used in the sulfuric acid manufacturing industry, or other equipment that can generate high-temperature steam.

The utility model uses the acid with a concentration of 98% generated in the two-turn and two-suction acid production process as a heat source to heat the circulating water for heating, which not only recycles the low-temperature waste heat in the production of sulfuric acid, but also saves the energy and cost required for heating. The utility model has the advantages of energy saving, consumption reduction, easy maintenance, and convenient modification of existing technologies. The acid cooler in the utility model can adopt an anode protection shell-and-tube type acid cooler, and also can adopt other types of acid coolers. When using an anodic protection shell-and-tube acid cooler, because the anode protection shell-and-tube acid cooler is generally made of 316L stainless steel, and the passivation effect of 316L stainless steel in concentrated sulfuric acid has an important relationship with the concentration and temperature of sulfuric acid, the concentration is The maximum operating temperature of 98% acid in the anode protection shell-and-tube acid cooler cannot be higher than 120°C, and it can work normally at about 100°C; the maximum use temperature of the acid with a concentration of 93% in the anode protection shell-and-tube acid cooler The temperature cannot be higher than 70°C, so acid with a concentration of 93% is not suitable as a heat source. Only acid with a concentration of 98% can be used for heating in winter, and intermediate water or desalinated water is used for heating circulating water, which is not easy to scale and is beneficial to prolong the service life of acid coolers and heating systems. The utility model does not destroy the original sulfuric acid production equipment, and is convenient for reforming the sulfuric acid production equipment in the prior art. In the seasons of spring, summer and autumn when heating is not needed, the valves on the circulating water inlet pipe and the circulating water outlet pipe can be opened by closing the valves on the heating water hot water pipe and the heating water temperature pipe. In winter when heating is required, close the valves on the circulating water inlet pipe and the circulating water outlet pipe, and open the valves on the heating water hot water pipe and the heating water warm water pipe to use. In normal use, it is only necessary to replenish the lost heating circulating water in time, which is convenient for maintenance. Through tests, the temperature of the heating circulating water heated by the utility model is stable between 65 DEG C and 80 DEG C, which can fully meet the needs of heating in winter. The utility model utilizes low-temperature waste heat in sulfuric acid production for heating, which not only effectively solves the difficult problem of low-temperature waste heat recovery, but also saves a lot of heating costs for enterprises, and can be widely used in sulfuric acid production enterprises.

Description of drawings

Fig. 1 is the schematic diagram of the utility model embodiment 1;

Fig. 2 is the schematic diagram of the utility model embodiment 2;

As shown in the picture: 1 circulating water outlet pipe, 2 valves, 3 valves, 4 heating water hot water pipes, 5 anode protection shell type acid cooler, 6 heating water temperature pipes, 7 valves, 8 valves, 9 circulating water inlet pipes , 10 hot water towers, 11 hot water pumps, 12 steam boilers, 13 valves, 14 connecting pipes, 15 warm water towers, 16 cooling devices, 17 heating circulating water replenishment towers, 18 warm water pumps.

Detailed ways

Example 1

As shown in Figure 1: the acid cooler is an anode-protected shell-and-tube acid cooler 5, and the tube side of the anode-protected shell-and-tube acid cooler 5 is connected to the circulating water inlet pipe 9 and the circulating water outlet pipe 1, and the anode protects the shell The shell side of the type acid cooler 5 is connected with the acid inlet pipe and the acid outlet pipe, the circulating water inlet pipe 9 and the circulating water outlet pipe 1 are respectively provided with a valve 8 and a valve 2, and the hot water tower 10 passes through the heating water hot water pipe 4 and the The tube side connection of the anode protection shell-and-tube acid cooler 5, the warm water tower 15 is connected to the tube side of the anode protection shell-and-tube acid cooler 5 through the heating water temperature pipe 6, the heating water and hot water pipe 4 is provided with a valve 3, and the heating water temperature The water pipe 6 is provided with a valve 7, a hot water pump 11 is provided on the pipeline between the hot water tower 10 and the cooling device 16, a warm water pump 18 is provided on the heating water warm water pipe 6, and the warm water tower 15 is connected with the heating circulating water supply tower 17 through the pipeline. connect.

In the spring, summer and autumn seasons when heating is not required in the utility model, the valve 3 and the valve 7 are in the closed state, the valve 2 and the valve 8 are in the open state, and the cooling circulating water flows through the circulating water inlet pipe 9 and the circulating water outlet pipe 1 Through the tube side of the anode-protected shell-and-tube acid cooler 5, the acid with a concentration of 98% flows through the shell side of the anode-protected shell-and-tube acid cooler 5 through the acid inlet pipe and the acid outlet pipe.

In the winter when heating is required, inject an appropriate amount of heating circulating water into the warm water tower 15 through the heating circulating water replenishment tower 17. The heating circulating water is selected from intermediate water. Under the action of the water pump 18, the heating circulating water in the warm water tower 15 flows into the tube side of the anode protection shell-and-tube acid cooler 5 through the heating water warm water pipe 6, and exchanges heat with the acid with a concentration of 98% flowing in the shell side. Heating The final heating circulating water flows into the hot water tower 10 from the heating water hot water pipe 4, and enters the cooling device 16 under the action of the hot water pump 11. The cooling device 16 can use cooling fins. After the heat dissipation of the cooling device 16, the temperature of the heating circulating water Descend, flow back to the warm water tower 15, and repeat the above process to realize continuous heating. If the heating circulating water is lost, inject an appropriate amount of heating circulating water into the warm water tower 15 through the heating circulating water replenishment tower 17 and get final product.

This embodiment is applicable to the situation when the heat supplied to the heating circulating water by the low-temperature waste heat is equal to the heat lost by the heating circulating water.

Example 2

As shown in Figure 2: the hot water tower 10 is provided with a heating circulating water warming device, the heating circulating water warming device is a steam boiler 12, and a connecting pipe 14 is arranged between the hot water tower 10 and the warm water tower 15, and the connecting pipe 14 Be provided with valve 13 on it, others are with Fig. 1.

In the seasons of spring, summer and autumn when heating is not needed, this embodiment is the same as embodiment 1.

In winter when heating is required, this embodiment is the same as Embodiment 1 during normal heating.

In the winter when heating is required, when the sulfuric acid dust production equipment temporarily stops, in order not to affect the heating, the warm water pump 18 can be shut down, and the valve 13 can be opened at the same time, so that the hot water tower 10 is connected with the warm water tower 15, and the hot water is supplied through the steam boiler 12. A small amount of high-temperature and low-pressure steam is transported in the tower 10 to maintain the temperature of the heating circulating water in the hot water tower 10. flow for auxiliary heating.

In the winter when heating is required, when the heat supplied by the low-temperature waste heat to the heating circulating water is less than the heat lost by the heating circulating water, the temperature of the heating circulating water will gradually decrease. A small amount of high-temperature and low-pressure steam is transported inside to maintain the temperature of the heating circulating water in the hot water tower 10 to ensure heating.

The utility model is not limited to the above embodiments. The heating circulating water can also use desalinated water or other water that is not easy to scale.

Claims (4)

1. A device for heating by using sulfuric acid to produce low-temperature waste heat, including an acid cooler, the acid cooler is divided into a tube side and a shell side, the shell side is connected with the acid inlet pipe and the acid outlet pipe, and the tube side is connected with the circulating water inlet pipe, The circulating water outlet pipe is connected, the circulating water inlet pipe and the circulating water outlet pipe are provided with valves, and the feature is that the tube side of the acid cooler is also connected to the heating device through the pipeline. 2. A kind of device utilizing sulfuric acid to produce low-temperature waste heat for heating according to claim 1, characterized in that said acid cooler is an anode protection shell-and-tube acid cooler, and said heating system comprises a hot water tower, Heat dissipation device, warm water tower; the hot water tower is connected to the tube side of the anode protection shell-and-tube acid cooler through the heating water hot water pipe, and the warm water tower is connected to the tube side of the anode protection shell-and-tube acid cooler through the heating water warm water pipe, and the heating water There are valves on the hot water pipe and heating water pipe, the hot water tower is connected with the cooling device through a pipeline, a hot water pump is installed on the pipeline, the cooling device and the warm water tower are connected through a pipeline, and the heating water temperature pipe is provided with The warm water pump and the warm water tower are connected with the heating circulating water supplementary tower through pipelines. 3. A device for heating by using sulfuric acid to produce low-temperature waste heat according to claim 2, characterized in that the hot water tower is connected to the heating circulating water warming device through a pipeline, and a connection is provided between the hot water tower and the warm water tower. The connecting pipe is provided with a valve. 4. A device for heating by utilizing sulfuric acid to produce low-temperature waste heat according to claim 3, characterized in that the device for increasing the temperature of the heating circulating water is a steam boiler.

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