Normal-temperature water flow adjusting pipeline of air separation unit
By designing the room temperature water flow regulation pipeline of the air-subdivided unit and using an automated adjustment mechanism, different energy consumption problems caused by artificial adjustment in the existing technology are solved, and automatic adjustment of the room temperature water flow under different loads is achieved to reduce energy consumption.
Patent Information
- Application Number
- CN202421691740.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the prior art, the room temperature water flow rate of the pre-cooling system of the air-substation unit needs to be adjusted manually, resulting in a large impact on empirical factors, different energy consumption, and a lack of an automated adjustment mechanism.
A room temperature water flow regulation pipeline for air-subdivided units is designed, including air cooling towers, room temperature water pipes, refrigerated water pipes, water flow meters, air flow meters and solenoid valves. Through the assignment module, the room temperature water flow is automatically adjusted to achieve water supply on demand.
It realizes automatic adjustment of the room temperature water flow under different compressed air flow, reduces the power consumption of the room temperature water pump, solves different energy consumption problems caused by human adjustment, and improves the automation and efficiency of the system.
Smart Images
Figure CN222926066U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of the precooling system of an air separation unit, and particularly relates to a normal temperature water flow regulation pipeline for an air separation unit. Background Art
[0002] The precooling system of an air separation unit is supported by the public auxiliary system of a steel plant. The air separation unit uses air as raw material and adopts the deep freezing method to produce high-purity industrial gas media such as oxygen, nitrogen, argon, etc., which is an important process indispensable for iron-making and steel-making users in the steel plant. Among them, the precooling system of the air separation unit is the key link for the pretreatment of air raw materials. The compressed air at 0.5 MPa and 80 °C after being compressed by the air compressor first enters the air cooling tower in the precooling system for cooling and washing. The air cooling tower adopts the gas-water mixed heat exchange method, and the compressed air passes through the packing of the air cooling tower from bottom to top. Normal temperature water and chilled water respectively enter from the middle and upper sections of the air cooling tower and directly contact and exchange heat with the compressed air from top to bottom.
[0003] The normal temperature water flow in the air cooling tower of the precooling system of the air separation unit is controlled by a pneumatic diaphragm regulating stop valve. The premise of flow control is to ensure the cooling of the compressed air, that is, the outlet temperature of the compressed air at the upper part of the air cooling tower is in the range of 12 - 17 °C. Since the air separation output changes synchronously with the production rhythm of the steel plant users, the compressed air flow also changes accordingly.
[0004] At this time, it is necessary to manually adjust the set value of the normal temperature water flow control valve to achieve the purpose of balancing the water distribution and reasonably consuming the electric energy of the water pump. Manual adjustment is greatly affected by experience factors, and the energy consumption of the precooling system of the air separation unit is different. Different personnel have different adjustment times, adjustment frequencies, and adjustment flow magnitudes for the water volume adjustment.
[0005] Therefore, a normal temperature water flow regulation pipeline for an air separation unit is proposed. Content of the Utility Model
[0006] The purpose of the utility model is to provide a normal temperature water flow regulation pipeline for an air separation unit, which has the function of regulating the normal temperature water flow of the air separation unit and solves the problems of large influence of experience factors in the existing manual adjustment and different energy consumption of the precooling system of the air separation unit.
[0007] In order to achieve the above purpose, the technical scheme adopted by the utility model is that the utility model provides a normal temperature water flow regulation pipeline for an air separation unit, including an air cooling tower. An air outlet pipe is arranged at the top of the air cooling tower, a chilled water pipe is arranged on one side of the top of the air cooling tower, a normal temperature water pipe is arranged on one side of the middle of the air cooling tower, a normal temperature water valve is arranged on the normal temperature water pipe, a water flowmeter is arranged on the normal temperature water pipe, an air inlet pipe is arranged on one side of the bottom of the air cooling tower, and an air flowmeter is arranged on the air inlet pipe.
[0008] Preferably, the inside of the air cooling tower is filled with packing.
[0009] Preferably, a chilled water valve is provided on the chilled water pipe.
[0010] Preferably, a return water pipe is led out from the bottom of the air-cooled tower, and a return water valve is provided on the return water pipe.
[0011] Preferably, the end of the normal temperature water pipe is connected to a normal temperature water pump.
[0012] Preferably, the normal temperature water valve is a solenoid valve, and the normal temperature water valve is provided with an assignment module, which is communicatively connected to a water flow meter, an air flow meter, and the air-cooled tower.
[0013] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:
[0014] 1. The present utility model can effectively adjust the flow rate of normal temperature water under different compressed air flow rates, that is, under different loads of the air separation unit, to achieve on-demand supply. On the premise of achieving washing and cooling, the power consumption of the normal temperature water pump is reduced;
[0015] 2. The present utility model has the function of adjusting the flow rate of normal temperature water of the air separation unit, solving the problems of manual adjustment in the prior art, large influence of empirical factors, and different energy consumption of the pre-cooling system of the air separation unit. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0017] Figure 1 It is a schematic structural diagram of a pipeline for adjusting the flow rate of normal temperature water of an air separation unit;
[0018] In the above figures, 1, intake pipe; 2, air-cooled tower; 3, packing; 4, outlet pipe; 5, chilled water pipe; 6, normal temperature water pipe; 7, normal temperature water pump; 8, return water pipe; 9, water flow meter; 10, air flow meter. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] In order to be able to more clearly understand the above objects, features, and advantages of the present utility model, the following will further illustrate the present utility model with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.
[0020] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.
[0021] Example 1, as Figure 1 shown, a normal temperature water flow regulation pipeline for an air separation unit includes an air cooling tower 2. The air cooling tower 2 cools and washes compressed air through a gas-water mixed heat exchange method, effectively utilizing the principle of gas-water mixed heat exchange to ensure that the compressed air reaches the expected temperature and provides suitable conditions for subsequent cryogenic treatment. An air outlet pipe 4 is provided at the top of the air cooling tower 2, and the air outlet pipe 4 discharges the cooled compressed air from the top of the air cooling tower 2 to prepare for the subsequent cryogenic process.
[0022] On one side at the top of the air cooling tower 2, a chilled water pipe 5 is provided. The chilled water pipe 5 introduces chilled water into the air cooling tower 2 to exchange heat with the compressed air, reducing the temperature of the compressed air through the chilled water and improving the cooling effect. On one side in the middle of the air cooling tower 2, a normal temperature water pipe 6 is provided. The normal temperature water pipe 6 introduces normal temperature water into the middle of the air cooling tower 2 to wash and exchange heat with the compressed air. The introduction of normal temperature water provides an auxiliary cooling effect in the initial cooling stage and improves the overall efficiency of the system.
[0023] A normal temperature water valve is provided on the normal temperature water pipe 6 to control the opening and closing and the opening degree of the normal temperature water pipe 6. A water flow meter 9 is provided on the normal temperature water pipe 6 to monitor the flow rate of the normal temperature water, ensuring that it is within the set range, capable of precisely controlling the flow rate of the normal temperature water, optimizing the water consumption, and reducing energy consumption. On one side at the bottom of the air cooling tower 2, an air inlet pipe 1 is provided. The air inlet pipe 1 introduces compressed air into the air cooling tower 2 to ensure that the compressed air can smoothly enter the air cooling tower 2 for subsequent cooling and washing treatment. An air flow meter 10 is provided on the air inlet pipe 1 to monitor the flow rate of the compressed air in the air inlet pipe 1, providing real-time air flow data for facilitating the adjustment of the normal temperature water flow rate and realizing water supply on demand.
[0024] The following specifically describes the specific designs of the above key components:
[0025] The air cooling tower 2 is internally filled with packing 3. The packing 3 increases the gas-water contact area, improves the heat exchange and washing effects, and optimizes the gas-water contact effect through the setting of the packing 3, improving the cooling and washing efficiency of the air cooling tower 2.
[0026] A chilled water valve is provided on the chilled water pipe 5 to control the opening and closing and the opening degree of the chilled water pipe 5.
[0027] A return water pipe 8 is led out from the bottom of the air-cooled tower 2. The return water pipe 8 returns the accumulated water at the bottom of the air-cooled tower 2 to the circulating water system, reducing water resource waste and improving the utilization rate of water. A return water valve is arranged on the return water pipe 8, and the opening and closing and the opening degree of the return water pipe 8 are controlled through the return water valve.
[0028] The end of the normal temperature water pipe 6 is connected to a normal temperature water pump 7. The normal temperature water pump 7 provides the power for the normal temperature water, ensures its inflow into the air-cooled tower 2, maintains the stable supply of the normal temperature water, and ensures the normal operation of the air-cooled tower 2.
[0029] After the air separation unit is started, first pour the compressed air at about 80 °C discharged from the air compressor into the air-cooled tower 2, so that the exhaust pressure of the air compressor synchronously rises to 0.45 - 0.5 Mpa with the air-cooled tower 2. Then start the normal temperature water pump 7 and the chilled water pump respectively, and adjust the flow rates of the normal temperature water and the chilled water entering the air-cooled tower 2 to be 280 m 3 / h and 90 m 3 / h. When the water level at the bottom of the air-cooled tower 2 gradually rises to 600 mm, adjust and open the return water valve larger. The accumulated water at the bottom of the air-cooled tower 2 returns to the circulating water under the action of the compressed air pressure.
[0030] The normal temperature water valve is an electromagnetic valve, and an assignment module is arranged inside the normal temperature water valve. The assignment module is communicatively connected to the water flowmeter 9, the air flowmeter 10, and the air-cooled tower 2. Establish the optimal corresponding values of the processed air and the normal temperature water flow rates under different loads of the air separation unit.
[0031] The basis for data analysis is to keep the temperature of the compressed air at the outlet of the air-cooled tower 2 within the specified range of 14 - 17 °C. The optimal control values of the normal temperature water flow rates under different loads and different compressed air flow rates of the air separation unit at 75 - 110%. Finally, a data correspondence table is formed, as shown in Table 1.
[0032] Table 1 Automatic control parameters of normal temperature water flow rate
[0033] Air separation load (%) <![CDATA[Compressed air flow rate (m 3 / h)]]> <![CDATA[Normal temperature water control flow rate (m 3 / h)]]> 75 120000 220 80 130000 230 90 140000 240 100 150000 260 110 160000 280
[0034] On the DCS control system, develop the assignment module of the normal temperature water valve. The assignment module is provided with an input button and a release button. When the release button is selected, the function module exits.
[0035] The target value of the assignment module is set by manual input. When the input button is selected, the target value cannot be modified manually. At this time, in the assignment module, use the IF statement to judge the data collected by the air flowmeter 10. If the value measured by the air flowmeter 10 is the same as a certain data in the compressed air flow rate column in the corresponding table, then automatically assign the normal temperature water flow rate value corresponding to the air volume in the table to the target value of the normal temperature water valve.
[0036] For example, when the current load is 80%, the processed compressed air volume is 132000 m3 / h. If the load of the air separation unit increases to 90% of the load, and if the compressed air flow rate increases to 140,000 m 3 / h, then the assignment module automatically assigns the value 240 to the target value of the normal temperature water valve. Then, the PID of the normal temperature water valve automatically compares the measured value of the water flow meter 9 with 240, judges the difference between the measured value and the target value, and outputs the valve opening degree, which is executed by the normal temperature water valve, and finally automatically controls the normal temperature water flow rate to 240 m 3 / h.
[0037] All the standard parts used in the present utility model can be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt the mature conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.
[0038] The above are only the preferred embodiments of the present utility model, and do not limit the present utility model in other forms. Any person skilled in the art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still belong to the protection scope of the technical solution of the present utility model.
Claims
1. A normal temperature water flow regulating pipeline for an air separation unit, characterized in that: It includes an air cooling tower, wherein an air outlet pipe is arranged at the top of the air cooling tower, a chilled water pipe is arranged at one side of the top of the air cooling tower, a normal temperature water pipe is arranged at one side of the middle of the air cooling tower, a normal temperature water valve is arranged on the normal temperature water pipe, a water flow meter is arranged on the normal temperature water pipe, an air inlet pipe is arranged at one side of the bottom of the air cooling tower, and an air flow meter is arranged on the air inlet pipe.
2. The normal temperature water flow regulating pipeline of an air separation unit according to claim 1, characterized in that: The air cooling tower is filled with fillers.
3. The normal temperature water flow regulating pipeline of an air separation unit according to claim 1, characterized in that: The chilled water pipe is provided with a chilled water valve.
4. The normal temperature water flow regulating pipeline of an air separation unit according to claim 1, characterized in that: A return water pipe is led out from the bottom of the air cooling tower, and a return water valve is arranged on the return water pipe.
5. The normal temperature water flow regulating pipeline of an air separation unit according to claim 1, characterized in that: The end of the normal temperature water pipe is connected to a normal temperature water pump.
6. The normal temperature water flow regulating pipeline of an air separation unit according to claim 1, characterized in that: The normal temperature water valve is a solenoid valve, and a value assignment module is provided on the normal temperature water valve. The value assignment module is communicatively connected with a water flow meter, an air flow meter and an air cooling tower.