Air pretreatment system for nitric acid production
By using air heat exchangers and filters in the air pretreatment system to regulate air temperature, the problem of damage to fans and air compressors under extreme temperatures has been solved, achieving stable equipment operation and increased production capacity.
Patent Information
- Application Number
- CN202520106175.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2035-01-16
AI Technical Summary
In the nitric acid production process, the blower is prone to overheating and damage in high-temperature environments, and the air compressor is prone to damage in low-temperature environments, resulting in shortened equipment life and unstable production capacity.
Design an air pretreatment system, including an air heat exchanger and an induced draft fan. The air temperature is regulated by connecting cold or hot water pipes to the air heat exchanger. The air is filtered by a filter cotton layer to prevent dust from entering. An insulation shell is used to protect the pipes and ensure a constant air temperature.
This enables the fan to operate stably under different temperature conditions, extends equipment life, improves production stability, and prevents equipment damage.
Smart Images
Figure CN223726899U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to nitric acid production equipment technical field, especially relate to a air pretreatment system for nitric acid production. BACKGROUND
[0002] The production process of industrial nitric acid mainly mixes ammonia gas and air according to certain proportion, then is passed into the hot platinum rhodium alloy net, under high temperature, ammonia is rapidly oxidized into nitrogen monoxide and water under the catalysis of alloy net, nitrogen monoxide is further oxidized to generate nitrogen dioxide, nitrogen dioxide is passed into water, and nitrogen dioxide reacts with water to generate nitric acid. In the production process, generally, the outside air is transported to the air filter by the fan, after filtration, is passed into the air compressor, and the air is mixed with ammonia gas after compression. But in the area with large temperature difference throughout the year, the temperature is higher in summer, the fan is long-time running, which is easy to make the fan overheating and damage, and the temperature is lower in winter, the cold air enters the air compressor, which is easy to make the air compressor damage. SUMMARY
[0003] The utility model discloses a kind of air pretreatment systems for nitric acid production, can when outside temperature is higher, air is cooled, when outside temperature is lower, air is heated, make air import temperature constant, fan long-period stable operation, increase capacity.
[0004] To achieve the above object, the utility model adopts the technical scheme of a kind of air pretreatment system for nitric acid production, including air heat exchanger and induced draft fan,
[0005] The air inlet of the induced draft fan is connected with the air outlet of the air heat exchanger;The air inlet of the air heat exchanger is fixed with filter cotton layer outside;
[0006] The water inlet of the air heat exchanger is connected with water inlet pipe, and the water outlet is connected with water outlet pipe;The water inlet pipe is connected with cold water pipe and hot water pipe respectively.
[0007] Preferably, it further includes air filter, and the air inlet of the air filter is connected with the air outlet of the induced draft fan.
[0008] Preferably, the water inlet main pipe and water outlet main pipe outside the air heat exchanger are provided with heat preservation shell;The water inlet pipe and water outlet pipe pass through heat preservation shell.
[0009] Preferably, valve is installed on the water inlet pipe, water outlet pipe, cold water pipe and hot water pipe.
[0010] The utility model discloses a kind of air pretreatment systems for nitric acid production, compared with prior art, has the following advantages:
[0011] (1) by connecting the air fan with the air heat exchanger, when the outside temperature is higher in summer, cold water is passed into the cold water pipe, the cold water enters the heat exchange pipe of the air heat exchanger, the cold water exchanges heat with the air, so that the temperature of the air entering the air fan is reduced, the air fan is prevented from being overheated and damaged, and the service life is prolonged, when the outside temperature is lower in winter, hot water or steam is passed into the hot water pipe, the hot water or steam enters the heat exchange pipe of the air heat exchanger and exchanges heat with the air, so that the temperature of the air entering the air fan is increased, and the relatively cold air is prevented from entering the air compressor of the nitric acid production system;
[0012] (2) the air is pre-filtered through the filter cotton layer, so that dust particles are prevented from entering the air heat exchanger and the air fan;
[0013] (3) simple design, easy to use. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a forward structure schematic view of the utility model;
[0015] Figure 2 It is a rear structure schematic view of the utility model;
[0016] Figure 3 It is a heat preservation shell structure schematic view. DETAILED DESCRIPTION
[0017] The utility model is further explained below in combination with the drawings and specific embodiments.
[0018] As shown in the figure, an air pretreatment system for nitric acid production, comprising an air heat exchanger 1 and an air fan 2, Figures 1-2 The air inlet of the air fan 2 is connected with the air outlet of the air heat exchanger 1 through flanges, wherein one end of the air heat exchanger 1 is provided with an air inlet, and the other end is provided with an air outlet, the air heat exchanger 1 can be installed on the outside of the nitric acid production workshop and be higher than the ground by a certain distance, so that the dust on the ground is prevented from being sucked into the air heat exchanger 1, when the air fan 2 starts, the outside air enters the air heat exchanger 1 from the air inlet of the air heat exchanger 1 and then enters the air fan 2, the air heat exchanger 1 is fixed with heat exchange pipes arranged in a serpentine shape, the liquid or steam in the heat exchange pipes exchanges heat with the sucked air, and the heat exchanged air is sucked into the nitric acid production system through the air fan 2; the air inlet of the air heat exchanger 1 is fixed with a filter cotton layer 3 outside, the air about to enter the air heat exchanger 1 is filtered through the filter cotton layer 3, and solid particles such as dust, pollen and other small suspended matters in the air are filtered out, and the filter cotton layer 3 is fixed outside the air inlet, so that the filter cotton layer 3 can be replaced regularly;
[0019]
[0020] The water inlet pipe 11 is connected with a water inlet pipe 11, and the water outlet pipe 12 is connected with a water outlet pipe 12, wherein one side of the air heat exchanger 1 is provided with a water inlet main pipe 13 and a water outlet main pipe 14, the water inlet main pipe 13 and the water outlet main pipe 14 are connected with the heat exchange pipe through a plurality of water inlet branch pipes and water outlet branch pipes, and the water inlet pipe 11 and the water outlet pipe 12 are connected with the water inlet main pipe 13 and the water outlet main pipe 14 respectively; the water inlet pipe 11 is connected with a cold water pipe and a hot water pipe respectively, wherein valves are installed on the water inlet pipe 11, the water outlet pipe 12, the cold water pipe and the hot water pipe, and the liquid flow is controlled through the valves; when the external temperature is high in summer, cold water is introduced into the cold water pipe, the cold water enters the heat exchange pipe of the air heat exchanger 1 after passing through the water inlet pipe 11, the induced draft fan 2 is started, the cold water exchanges heat with air, so that the temperature of the air entering the induced draft fan 2 is reduced, the induced draft fan 2 is prevented from being overheated and damaged, and the service life is prolonged; when the external temperature is low in winter, hot water or steam is introduced into the hot water pipe, the hot water or steam enters the heat exchange pipe of the air heat exchanger 1 after passing through the water inlet pipe 11, and exchanges heat with air, so that the temperature of the air entering the induced draft fan 2 is increased, and cold air is prevented from entering the air compressor of the nitric acid production system; when the temperature is normal, cold water or hot water does not need to be introduced into the cold water pipe or the hot water pipe, and the induced draft fan 2 can be started.
[0021] In the embodiment, an air filter is further included, an air inlet of the air filter is connected with an air outlet 21 of the induced draft fan 2, and the air after heat exchange is further filtered through the air filter, so that small impurities in the air are prevented from entering the nitric acid production system.
[0022] As shown in the embodiment, Figure 3 As shown in the embodiment,
[0023] The use method of the utility model is: when the external temperature is high in summer, cold water is introduced into the cold water pipe, the cold water enters the heat exchange pipe of the air heat exchanger 1 after passing through the water inlet pipe 11, the motor of the induced draft fan 2 is started at the same time, the induced draft fan 2 sucks air, external air passes through the filter cotton layer 3, enters the air heat exchanger 1 from the air inlet of the air heat exchanger 1, the cold water exchanges heat with air, then the cold air enters the induced draft fan 2, so that the temperature of the air entering the induced draft fan 2 is reduced; when the external temperature is low in winter, hot water or steam is introduced into the hot water pipe, the hot water or steam enters the heat exchange pipe of the air heat exchanger 1 after passing through the water inlet pipe 11, exchanges heat with air, so that the temperature of the air entering the induced draft fan 2 is increased, the air discharged from the induced draft fan 2 enters the air filter, the air is further filtered, and then is introduced into the air compressor of the nitric acid production system.
Claims
1. An air pre-treatment system for nitric acid production, characterized by, It comprises an air heat exchanger (1) and an air blower (2), The air inlet of the air blower (2) is connected with the air outlet of the air heat exchanger (1); the outside of the air inlet of the air heat exchanger (1) is fixed with a filter cotton layer (3); The water inlet of the air heat exchanger (1) is connected with a water inlet pipe (11), and the water outlet is connected with a water outlet pipe (12); the water inlet pipe (11) is respectively connected with a cold water pipe and a hot water pipe.
2. The air pre-treatment system for nitric acid production according to claim 1, characterized in that, It further comprises an air filter, and the air inlet of the air filter is connected with the air outlet (21) of the air blower (2).
3. The air pre-treatment system for nitric acid production according to claim 1, characterized in that, The water inlet main pipe and the water outlet main pipe outside the air heat exchanger (1) are provided with a heat preservation shell (4); the water inlet pipe (11) and the water outlet pipe (12) pass through the heat preservation shell (4).
4. The air pre-treatment system for nitric acid production according to claim 1, characterized in that, Valves are installed on the water inlet pipe (11), the water outlet pipe (12), the cold water pipe and the hot water pipe.