A device for controlling the flow rate of regeneration gas in a float glass production line

Abstract

This utility model discloses a regeneration gas flow control device for a float glass production line, aiming to solve the problem of unstable gas intake to the electric heating device during dryer switching, which affects subsequent gas supply. The device includes an air separation nitrogen generation system, with the dryer and an air separation nitrogen purifier connected in parallel at its output end. An electric heating device is connected upstream of the air separation nitrogen purifier. A vent flow controller is connected in parallel to the dryer pipeline, and a gas flow sensor linked to the vent flow controller is connected upstream of the electric heating device. A total flow controller is installed upstream of the dryer, communicating bidirectionally with the vent flow controller. This device stabilizes the gas intake flow to the electric heating device through closed-loop control, avoiding equipment failure and ensuring stable gas supply.

Description

Technical Field

[0001] This utility model relates to the field of float glass production technology, and in particular to a device for controlling the flow rate of regeneration gas in a float glass production line. Background Technology

[0002] In the large-scale production process of float glass, the air compressor station dryer and the air separation nitrogen generation system are key equipment to ensure the quality of the production gas. The air separation nitrogen generation system needs to remove impurities such as moisture and carbon dioxide from the raw material air through a purifier, which generates a large amount of surplus regeneration gas during regeneration. Meanwhile, the air compressor station dryer needs to continuously supply regeneration gas to regenerate the adsorbent in order to achieve dehydration and drying of compressed air. The supply and demand relationship of regeneration gas between the two provides a feasibility for energy recovery and utilization. At present, the industry generally adopts the utilization mode of "direct supply of surplus regeneration gas from air separation nitrogen generation to dryer", that is, the surplus regeneration gas discharged from the air separation nitrogen generation system is directly transported to the air compressor station dryer through pipelines, replacing the traditional independent regeneration gas source, so as to achieve the purpose of energy saving, consumption reduction and optimized resource allocation.

[0003] However, the existing direct supply model lacks an effective flow and pressure control mechanism, and has exposed significant systemic interference problems in actual operation. The core problem lies in the impact of the dryer switching process on the air separation nitrogen production system: the dryer adopts a dual-tower alternating working mode, and the adsorption tower and regeneration tower need to be switched at regular intervals. At the moment of switching, the dryer's demand for regeneration gas will change drastically - from low-flow regeneration of a single tower to instantaneous high-flow replenishment of the dual towers, which causes the pressure in the regeneration gas delivery pipeline to fluctuate violently, directly causing the regeneration gas pressure of the air separation nitrogen production system to drop rapidly.

[0004] This pressure fluctuation poses a serious threat to the operation of the electric heating system in the air separation nitrogen production system. The regeneration effect of the purifier depends on a stable regeneration gas flow rate and temperature. The electric heating device needs to continuously output heat according to the set temperature to ensure the regeneration gas reaches a regeneration temperature of 180-220℃. When the regeneration gas pressure drops, the flow rate of regeneration gas through the electric heating device decreases accordingly, causing heat to be unable to be carried away in time, resulting in a "localized overheating" phenomenon—the surface temperature of the electric heating tube may exceed the design limit. This not only accelerates the oxidation and aging of the electric heating tube, shortening its service life, but may also trigger the temperature protection device to trip, causing the purifier regeneration to be interrupted. Incomplete purifier regeneration leads to a decrease in the adsorbent's adsorption capacity, which in turn reduces the purity of the nitrogen produced. This affects the inert gas protection effect of key processes such as the float glass tin bath, potentially causing production quality problems such as glass surface defects and tin oxidation, and even leading to production line shutdowns for maintenance, resulting in significant economic losses. Utility Model Content

[0005] The technical problem to be solved by this utility model is that when the dryer switches working states, the air intake of the electric heating device becomes unstable, which affects the stable air supply of the subsequent production line.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a regeneration gas flow control device for float glass production line, including an air separation nitrogen generation system and a dryer and an air separation nitrogen purifier connected in parallel at the output end of the air separation nitrogen generation system. An electric heating device is connected upstream of the air separation nitrogen purifier, and a vent flow controller is connected in parallel on the connecting pipe of the dryer. A gas flow sensor that is linked to the signal of the vent flow controller is connected upstream of the electric heating device.

[0007] Preferably, the vent flow controller includes an electrically adjustable butterfly valve, a flow acquisition module, and a local control chip. The gas flow sensor and the flow acquisition module are signal-connected to the local control chip. The flow acquisition module is located downstream of the electrically adjustable butterfly valve, and the local control chip is electrically connected to the electrically adjustable butterfly valve.

[0008] Preferably, the electrically adjustable butterfly valve is a high-temperature resistant angle regulating valve.

[0009] Preferably, the flow acquisition module is a differential pressure flow meter, and a filter screen is provided at the end of the pressure tapping tube of the differential pressure flow meter.

[0010] Preferably, the gas flow sensor is a vortex flow meter, the detection end surface of the gas flow sensor is coated with a silicon carbide wear-resistant layer, and the gas flow sensor is internally equipped with a temperature compensation module for correcting gas density.

[0011] Preferably, the dryer and the vent flow controller are connected upstream to a total flow controller for maintaining the gas demand of the dryer in different operating modes. The total flow controller communicates bidirectionally with the vent flow controller and can receive vent flow data and match corresponding thresholds according to the operating mode of the dryer.

[0012] Preferably, an impedance composite silencer is connected to the downstream pipe of the vent flow controller, and a condensate collection box is detachably installed at the bottom of the silencer.

[0013] This utility model provides a regeneration gas flow control device for float glass production lines, which has the following beneficial effects.

[0014] The device constructs a closed-loop control system through a linkage structure between a gas flow sensor and a vent flow controller. A vortex flow meter upstream of the electric heating unit collects in-situ gas flow data in real time. When the dryer switches, causing a flow drop, the signal is immediately transmitted to the local control chip of the vent flow controller. The chip, combined with the vent flow feedback from the flow acquisition module, precisely adjusts the opening of the high-temperature angle regulating valve, compensating for system flow gaps by controlling the vent volume. This process is rapid, stabilizing fluctuations in the inlet gas flow of the electric heating unit, solving the problem of localized overheating, preventing accelerated aging of the electric heating tube or tripping shutdowns, ensuring continuous and stable regeneration of the purifier, and eliminating the risk of gas supply interruption at its source. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the connection relationship in an embodiment of the present utility model.

[0017] In the diagram: 1. Air separation nitrogen generation system; 2. Total flow controller; 3. Dryer; 4. Vent flow controller; 5. Electric heating device; 6. Air separation nitrogen purifier. Detailed Implementation

[0018] like Figure 1 As shown, the main output pipeline of the air separation nitrogen generation system 1 is divided into two branches through a three-way connector, which are respectively connected to the dryer 3 and the air separation nitrogen purifier 6. Both branches are equipped with valves for independent on / off control. The upstream pipeline of the air separation nitrogen purifier 6 is connected in series with an electric heating device 5 to ensure that the regeneration gas meets the regeneration requirements of the purifier.

[0019] The total flow controller 2 is installed upstream of the tee joint of the main output pipeline of the air separation nitrogen production system 1. It consists of a sleeve-type electric regulating valve, a vortex main flow sensor and a PLC main control module. The main control module pre-stores the total flow thresholds for three levels: adsorption, regeneration and switching of the dryer 3.

[0020] A gas flow sensor, using a vortex flow meter, is installed on the upstream pipe of the electric heating device 5. The sensor end surface is coated with a wear-resistant layer, and an internal temperature compensation module is integrated. It is connected to the vent flow controller 4 via a signal line. The vent flow controller 4 is connected in parallel to the inlet pipe of the dryer 3 and consists of a high-temperature resistant angle-type electric regulating butterfly valve, a differential pressure flow acquisition module, and a local control chip. The flow acquisition module is installed downstream of the electric regulating butterfly valve, and the local control chip communicates bidirectionally with the main control module of the total flow controller 2 via a bus. The downstream pipe of the vent flow controller 4 is connected to an impedance composite silencer. A removable condensate collection box is threaded to the bottom of the silencer, and a liquid level observation window is provided on the side of the box for easy cleaning of accumulated liquid.

[0021] When dryer 3 switches from "regeneration mode" to "adsorption mode", the flow control process of the device is as follows: Before switching, dryer 3 is in single-tower regeneration mode. The main control module of total flow controller 2 receives the status signal of dryer 3, matches the corresponding total flow threshold, the main electric regulating valve maintains the corresponding opening, and the main flow sensor collects the actual flow. At this time, the electric regulating butterfly valve of vent flow controller 4 is in the closed state, the gas flow sensor detects that the upstream flow of electric heating device 5 meets the regeneration requirements of air separation nitrogen purifier 6, and the system operates stably.

[0022] After the dryer 3 issues a switching warning signal, the main control module of the total flow controller 2 quickly adjusts the total flow threshold, controls the main electric regulating valve to increase its opening, and the flow rate displayed by the main flow sensor increases accordingly. At the moment of switching, the demand for regeneration gas in the dryer 3 increases sharply, causing a brief drop in the flow rate upstream of the electric heating device 5. The gas flow sensor immediately transmits the signal to the local control chip of the vent flow controller 4. The local control chip, combined with the vent flow data fed back by the flow acquisition module, calculates the required vent flow rate and then sends a command to the electric regulating butterfly valve to adjust its opening. Within a short time, the gas flow sensor detects that the flow rate upstream of the electric heating device 5 has rebounded, and the flow fluctuation range is controlled within a reasonable range. The electric heating device 5 does not trigger an overheating alarm.

[0023] After the dryer 3 enters the adsorption mode, the main control module of the total flow controller 2 lowers the total flow threshold and the main electric regulating valve reduces its opening. Based on the stable flow feedback from the gas flow sensor, the local control chip controls the electric regulating butterfly valve of the vent flow controller 4 to gradually close, eventually returning to the initial closed state, and the system returns to stable operation.

[0024] In actual operation, the device can achieve stable control of the upstream flow of the electric heating device 5 during the switching process of dryer 3, and the surface temperature of the electric heating tube remains stable without overheating tripping. The total flow controller 2 and the vent flow controller 4 respond quickly and adapt to the switching cycle of dryer 3. After long-term continuous operation, the detection accuracy of the vortex flow meter has not significantly decreased, the sealing performance of the electric regulating butterfly valve of the vent flow controller 4 is intact, and the condensate collection box of the silencer can be cleaned regularly to avoid pipeline corrosion problems, ensuring the stable and coordinated operation of the air separation nitrogen generation system 1 and the air separation nitrogen purifier 6.

Claims

1. A regeneration gas flow control device for a float glass production line, comprising an air separation nitrogen generation system (1) and a dryer (3) and an air separation nitrogen purifier (6) connected in parallel at the output end of the air separation nitrogen generation system (1), wherein an electric heating device (5) is connected upstream of the air separation nitrogen purifier (6), characterized in that: A vent flow controller (4) is connected in parallel to the connecting pipe of the dryer (3), and a gas flow sensor that is linked to the signal of the vent flow controller (4) is connected upstream of the electric heating device (5).

2. A device for controlling the flow of regenerative gas in a float glass production line as claimed in claim 1, characterized in that: The vent flow controller (4) includes an electric regulating butterfly valve, a flow acquisition module and a local control chip. The gas flow sensor and the flow acquisition module are connected to the local control chip. The flow acquisition module is located downstream of the electric regulating butterfly valve, and the local control chip is electrically connected to the electric regulating butterfly valve.

3. A device for controlling the flow of regenerative gas in a float glass production line as claimed in claim 2, characterized in that: The electric regulating butterfly valve is a high-temperature resistant angle regulating valve.

4. A device for controlling the flow of regenerative gas in a float glass production line as claimed in claim 2, characterized in that: The flow acquisition module is a differential pressure flow meter, and a filter screen is provided at the end of the pressure tapping tube of the differential pressure flow meter.

5. The regeneration gas flow control device for a float glass production line as described in claim 1, characterized in that: The gas flow sensor is a vortex flow meter. The surface of the detection end of the gas flow sensor is coated with a silicon carbide wear-resistant layer. The gas flow sensor is equipped with a temperature compensation module for correcting gas density.

6. A device for controlling the flow of regenerative gas in a float glass production line as claimed in claim 1, characterized in that: The dryer (3) and the vent flow controller (4) are connected upstream to a total flow controller (2) for maintaining the gas demand of the dryer (3) in different working modes. The total flow controller (2) communicates bidirectionally with the vent flow controller (4) and can receive vent flow data and match the corresponding threshold according to the working mode of the dryer (3).

7. A device for controlling the flow of regenerative gas in a float glass production line as claimed in claim 1, characterized in that: The downstream pipe of the vent flow controller (4) is connected to an impedance composite silencer, and a condensate collection box is detachably installed at the bottom of the silencer.

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