Steam type circulating drying system for solid materials

Abstract

The utility model relates to the technical field of solid material drying, and discloses a steam type circulating drying system for solid materials, which comprises a steam type dryer, a flash evaporator, a washing tower and a storage tank, the storage tank is connected with the feeding end of the steam dryer, the flash evaporator is communicated with the head end of a heat exchange pipe of the steam dryer, the tail end of the heat exchange pipe is connected with the bottom of the flash evaporator through a primary steam discharging pipe, and a heating pump is arranged on a primary steam conveying pipe. The steam dryer is communicated with the washing tower, and the washing tower is connected with the flash evaporator. According to the circulating drying system, electric energy is used for heating to generate steam for drying, existing coal or coal gas heating drying is replaced, meanwhile, the washing tower is arranged, secondary steam containing particles generated by wetting materials in the drying process is purified, and the whole drying system is free of pollution to the environment; and secondary steam in the drying process is recycled, so that the heat exchange efficiency is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of solid material drying, in particular to a steam type circulating drying system for solid materials. Background Art

[0002] Many industries such as chemical industry, metallurgy, and pharmaceutical industry need to dry various solid materials. Whether it is flue gas contact drying or steam heat exchange drying, it is necessary to burn coal or gas to obtain heat. These processes require coal-fired boilers. Such small boilers are generally not equipped with desulfurization and denitrification facilities, which will cause serious environmental pollution. In addition, the heat exchange efficiency of small boilers is low, and it is a high-energy consumption and high-pollution equipment. Utility Model Content

[0003] The utility model provides a steam type circulating drying system for solid materials, which solves the problem of low working efficiency of existing drying equipment.

[0004] A steam-type circulating drying system for solid materials, comprising: a steam dryer, a flash evaporator, a washing tower and a storage tank for storing wet materials;

[0005] The storage tank is connected to the feed end of the steam dryer through a feed pipeline, and the discharge end of the steam dryer is connected to a dry material collection container;

[0006] The flash evaporator is connected to the head end of the heat exchange tube of the steam dryer through a primary steam delivery pipe, and the tail end of the heat exchange tube is connected to the bottom of the flash evaporator through a primary steam discharge pipe. A heating pump for increasing steam pressure and temperature is provided on the primary steam delivery pipe.

[0007] The chamber of the steam dryer for drying wet materials is connected to the washing tower through a secondary steam delivery pipe, and the washing tower is also connected to the bottom of the flash evaporator through a secondary steam discharge pipe.

[0008] Furthermore, condensate water accumulates at the bottom of the flash evaporator, and part of the condensate water is pumped into the washing tower through a condensate pump.

[0009] Furthermore, an electric heater is provided at the bottom of the flash evaporator, and the condensed water is heated by the electric heater to generate high-temperature steam.

[0010] Furthermore, the washing tower is connected to a waste pump.

[0011] Furthermore, the storage tank is connected to a vacuum pump, and a feeding valve is provided on the feeding pipeline.

[0012] Furthermore, the flash evaporator is connected to a make-up water pipe.

[0013] The utility model has the following beneficial effects:

[0014] (1) The circulating drying system of the utility model utilizes electric energy to heat and generate steam for drying, replacing the existing coal or gas heating and drying. At the same time, a washing tower is provided to purify the secondary steam containing particles generated by the wet material during the drying process, making the entire drying system pollution-free to the environment.

[0015] (2) The circulating drying system of the utility model recycles the secondary steam in the drying process, which not only improves the heat exchange efficiency but also reduces energy consumption.

[0016] (3) The circulating drying system of the utility model implements internal circulation after startup. It only needs to add a small amount of water to the system. It does not rely on the introduction of external steam, and there is almost no loss of steam in the system.

[0017] (4) The circulating drying system of the utility model can realize the repeated reuse of the waste materials enriched in the washing tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the principle of the drying system of the utility model.

[0019] In the figure: 1-steam dryer; 2-flash evaporator; 3-electric heater; 4-condensate pump; 5-washing tower; 6-waste pump; 7-heating pump; 8-storage tank; 9-vacuum pump; 10-feeding valve. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0021] Embodiment 1

[0022] refer to Figure 1 The utility model provides a steam-type circulating drying system for solid materials, comprising: a steam dryer 1, a flash evaporator 2, a washing tower 5 and a storage tank 8 for storing wet materials.

[0023] The storage tank 8 is connected to the feed end of the steam dryer 1 through a feed pipe, and the discharge end of the steam dryer 1 is connected to a dry material collection container. The wet material becomes dry material after being heated and dried by the steam dryer 1. The steam dryer 1 is a device that uses high-temperature and high-pressure steam to dry materials with high humidity. It mainly transfers heat to the wet material through the high-temperature steam in the heat exchange tube, so that the water in the wet material evaporates, thereby drying the material.

[0024] The storage tank 8 is connected to a vacuum pump 9. When the storage tank 8 is filled with wet solid materials, the air in the storage tank 8 is sucked out by the vacuum pump 9 to make the internal air pressure lower than the external air pressure, so as to facilitate the transportation of the wet solid materials to the steam dryer 1. A feeding valve 10 is provided on the feeding pipeline, and the feeding valve 10 is controlled to open and close to control the transportation amount and transportation time period of the wet solid materials into the steam dryer 1.

[0025] The flash evaporator 2 is connected to the head end of the heat exchange tube of the steam dryer 1 through a primary steam delivery pipe, and the tail end of the heat exchange tube is connected to the bottom of the flash evaporator 2 through a primary steam discharge pipe. A heating pump 7 for increasing the steam pressure and temperature is provided on the primary steam delivery pipe. When the high-temperature steam generated by the flash evaporator 2 is pressurized and heated by the heating pump 7 and then delivered to the heat exchange tube, the heat exchange tube contacts the wet solid material inside the steam dryer 1, and transfers heat to the wet solid material to evaporate water. The low-temperature steam with reduced heat in the rear section of the heat exchange tube and the condensed water return to the bottom of the flash evaporator 2, completing a heat exchange cycle.

[0026] A large amount of condensed water is accumulated at the bottom of the flash evaporator 2. An electric heater 3 is provided at the bottom of the flash evaporator 2 to heat the condensed water and generate high-temperature steam again.

[0027] The chamber of the steam dryer 1 for drying the wet solid material is connected to the washing tower 5 through a secondary steam delivery pipe, and the washing tower 5 is also connected to the bottom of the flash evaporator 2 through a secondary steam discharge pipe. The secondary steam of particulate matter / harmful gas generated after the wet solid material is dried enters the washing tower 5 from the drying chamber of the steam dryer 1. There is a purification pool inside the washing tower 5 for dust removal and dissolving harmful gases. The secondary steam containing particulate matter and harmful gas is purified and discharged from the secondary steam discharge pipe at the top of the washing tower 5 to the flash evaporator 2 for the next steam cycle.

[0028] A portion of the condensate accumulated at the bottom of the flash evaporator 2 is pumped to the inside of the scrubbing tower 5 by the condensate pump 4 to purify the secondary steam containing particulate matter and harmful gases.

[0029] The washing tower 5 is connected to a waste pump 6 for extracting a mixed liquid containing dissolved harmful gases and particulate matter for chemical treatment or recycling to a production line for reuse.

[0030] The flash evaporator 2 is connected with a make-up water pipe for adding water to the entire system.

[0031] When the circulating drying system of this embodiment is started, the electric heater 3 on the flash evaporator 2 heats and softens the condensed water to generate primary steam. When the steam of the entire drying system reaches equilibrium, the electric heater 3 stops working; when the steam loss of the drying system reaches a certain amount, the electric heater 3 is turned on to supplement the steam.

[0032] The steam dryer 1 and flash evaporator 2 in this embodiment can be selected from existing equipment on the market, and the models of the condensate pump 4, waste pump 6, heating pump 7, vacuum pump 9 and feed valve 10 are configured according to the type and scale of the drying material.

[0033] Embodiment 2

[0034] In this embodiment, the drying system in the first embodiment is used to dry the water-containing calcium powder. The moisture content of the wet calcium powder is 30%-40%, and the temperature is 25°C. After the first drying, the moisture content of the dried material is 0.8%, and the temperature of the dried material is 60-70°C. The primary steam used for drying is 0.8MPa, the temperature is 170°C, the air intake is 2.3t / h, and the low-temperature steam temperature after heat exchange is 133°C and the air pressure is 0.3MPa; the secondary steam generated by the drying of the wet calcium powder has a temperature of 105°C, an air pressure of 0.1MPa, and an air output of 1.92t / h. After washing in the washing tower, it enters the flash evaporator at 1.86t / h; the primary steam discharged from the flash evaporator has a pressure of 0.1MPa, a temperature of 105°C, and a flow rate of 2.3t / h, and is compressed and pressurized by a heating pump and heated to 170°C and 0.8MPa for heat exchange.

[0035] The whole drying system processes wet calcium powder at a rate of 6t / h. The flash evaporator consumes 270KW of power and the heating pump consumes 300KW of power, for a total of 570KW.

[0036] The above is only a preferred embodiment of the utility model, which does not represent all possible forms of the utility model, and the protection scope of the utility model is not limited to such special statements and embodiments. According to the technical inspirations disclosed by the utility model, various other modifications and improvements that do not deviate from the essence of the utility model are made, and these modifications and improvements are still within the protection scope of the utility model.

Claims

1. A steam circulation drying system for solid materials, characterized in that: include: A steam dryer (1), a flash evaporator (2), a washing tower (5) and a storage tank (8) for storing wet materials; The storage tank (8) is connected to the feed end of the steam dryer (1) via a feed pipe, and the discharge end of the steam dryer (1) is connected to a dry material collection container; The flash evaporator (2) is connected to the head end of the heat exchange tube of the steam dryer (1) through a primary steam delivery pipe, and the tail end of the heat exchange tube is connected to the bottom of the flash evaporator (2) through a primary steam discharge pipe. A heating pump (7) for increasing steam pressure and temperature is provided on the primary steam delivery pipe; The chamber of the steam dryer (1) for drying wet materials is connected to a washing tower (5) through a secondary steam delivery pipe, and the washing tower (5) is simultaneously connected to the bottom of the flash evaporator (2) through a secondary steam discharge pipe.

2. The steam circulation drying system for solid materials according to claim 1, characterized in that: Condensate water accumulates at the bottom of the flash evaporator (2), and part of the condensate water is pumped into the washing tower (5) through a condensate pump (4).

3. The steam circulation drying system for solid materials according to claim 2, characterized in that: An electric heater (3) is provided at the bottom of the flash evaporator (2), and the condensed water is heated by the electric heater (3) to generate high-temperature steam.

4. The steam circulation drying system for solid materials according to claim 1, characterized in that: The washing tower (5) is connected to a waste pump (6).

5. The steam circulation drying system for solid materials according to claim 1, characterized in that: The material storage tank (8) is connected to a vacuum pump (9), and a feeding valve (10) is provided on the material delivery pipeline.

6. The steam circulation drying system for solid materials according to any one of claims 1 to 5, characterized in that: The flash evaporator (2) is connected to a make-up water pipe.

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