Automatic variable-frequency control system for flow of chilling water of gasification furnace
By using black water circulation pumps for frequency conversion control in the water coal slurry gasification industry, the safety and cost problems of cold water flow control of gasifiers are solved, automatic adjustment and stable control are realized, equipment failure and operation risks are reduced, and the risks of equipment are improved. Operational stability.
Patent Information
- Application Number
- CN202420206127.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-01-29
AI Technical Summary
In the water-coal slurry gasification industry, valves controlled by gasifiers cannot be repaired or replaced online, resulting in cold water interruption in the event of a failure, which may lead to equipment damage and safety accidents, and long-term operation will lead to valve wear and unstable operation of the valve , increasing production costs.
The black water circulation pump is used for frequency conversion control, the traditional flow regulating valve is cancelled, and the automatic adjustment and stable control of the cold water flow is achieved through the DCS system to reduce valve failure and operation risks.
It effectively reduces safety risks and costs in production operation, extends the equipment operation cycle, improves operating stability and flow control accuracy, and reduces valve wear and maintenance needs.
Smart Images
Figure CN222182182U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an automatic control system, more specifically, to a gasification furnace quenching water flow frequency conversion automatic control system, belonging to the field of petrochemical industry. Background Art
[0002] At present, the coal gasification industry is divided into two main categories, water-coal slurry gasification and pulverized coal gasification. A major process of water-coal slurry gasification is the quenching process, which mainly uses quenching water to wash and cool the synthetic gas and liquid slag after combustion. The quenching water directly protects the downcomer in the gasifier and is a very important control indicator for water-coal slurry gasification.
[0003] In the water-coal slurry gasification industry, 95% of the chilled water flow control of the gasifier is remotely controlled through a black water angle valve or an eccentric ball valve. The operation cycle of a single burner in a water-coal slurry gasifier is 90-120 days. Generally, when there is no major operating risk in the operation of the gasifier, the burner will be replaced online after the burner life expires, and the gasifier will operate for the second cycle. However, the chilled water control valve cannot be repaired or replaced online. Therefore, when the chilled water flow control valve of the gasifier fails, the chilled water of the gasifier will be cut off, causing the gasifier to jump. In severe cases, it will directly burn through the downcomer in the gasifier, causing a short circuit in the synthesis gas, resulting in damage to equipment and pipelines, and production safety accidents such as high-to-low synthesis gas. Utility Model Content
[0004] In order to solve the above-mentioned existing technical problems, the utility model provides a gasifier chilling water flow variable frequency automatic control system which has the technical characteristics of being able to solve the unsafe factors brought about by the current operating status and reduce the production and operation costs.
[0005] In order to achieve the above purpose, the utility model is implemented by the following technical solutions:
[0006] A variable frequency automatic control system for quenching water flow in a gasifier comprises a gasifier with a process burner, wherein the gasifier is connected to the inlet end of a cyclone separator through a pipeline, the outlet end at the top of the cyclone separator is connected to the inlet end of a water washing tower through a pipeline, the outlet end of the water washing tower is connected to a quenching water flow meter through a pipeline, and the quenching water flow meter is connected to the gasifier through a pipeline.
[0007] Preferably, the outlet end of the water washing tower is connected to a black water circulation pump via a pipeline, and the black water circulation pump 5 is connected to a quenching water flow meter via a pipeline.
[0008] Preferably, the outlet end of the quenching water flow meter is connected to a black water filter via a pipeline, and the black water filter 7 is connected to the gasifier via a pipeline.
[0009] Preferably, the gasifier, the quenching water flow meter, and the black water circulation pump are communicatively connected.
[0010] Beneficial effects: It effectively solves the unsafe factors brought about by the current operating status and reduces the production and operation costs, which is specifically reflected in the following aspects:
[0011] 1. The black water circulation pump is reduced from the traditional 1000V to 380V, reducing the operating cost.
[0012] 2. Eliminate the chilled water flow regulating valve to reduce the maintenance cost of the original valve.
[0013] 3. The black water circulation pump is used to achieve frequency conversion control, and the operational stability is greatly improved, reducing the operational instability caused by valve wear and jamming due to long-term operation.
[0014] 4. The flow rate can be automatically controlled with the black water circulation pump, and the chilled water flow rate can be increased and automatically adjusted by the DCS setting. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION
[0016] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.
[0017] Chilled water (≈625m 3 / h, 235℃, 6.9Mpa) is the black water at the bottom of the water washing tower 4. The quenching water has a certain solid content (about 0.7%), so long-term operation has a great scouring effect on the pipelines and valves. The quenching water regulation of water-coal slurry gasification design uses a flow control valve. In the later stage of operation, the valve core is severely eroded and worn, and stuck. When adjusting the flow, the valve is difficult to move and the adjusted flow fluctuates greatly. When encountering start-up and shutdown conditions, the flow cannot be adjusted, and the operation is difficult.
[0018] The difference between this application and the traditional valve flow control is that the chilling water control is controlled by the chilling water pump inverter, the valve flow regulation is cancelled, and the chilling water flow is stably regulated through frequency conversion and flow cascade control. The flow fluctuation of valve control is reduced, and the constraints of valve failure and service life cycle are reduced, the operation cycle of the gasifier is extended, and the risk of gasifier interruption of chilling water is reduced.
[0019] like Figure 1The figure shows a specific embodiment of a gasifier quenching water flow variable frequency automatic control system, which is a gasifier quenching water flow variable frequency automatic control system, including a gasifier 2 with a process burner 1, the gasifier 2 is connected to the inlet end of the cyclone separator 3 through a pipeline, the outlet end of the top of the cyclone separator 3 is connected to the inlet end of the water washing tower 4 through a pipeline, the outlet end of the water washing tower 4 is connected to a black water circulation pump 5 through a pipeline, the black water circulation pump 5 is connected to the quenching water flow meter 6 through a pipeline, the outlet end of the quenching water flow meter 6 is connected to a black water filter 7 through a pipeline, the black water filter 7 is connected to the gasifier 2 through a pipeline, the gasifier 2, the quenching water flow meter 6, and the black water circulation pump 5 are communicatively connected, and further, the gasifier 2, the quenching water flow meter 6, and the black water circulation pump 5 in the present application can be connected to a DCS system to achieve more intelligent control.
[0020] The black water circulation pump 5 is frequency-controlled, the voltage of the black water circulation pump 5 is 380V, and the chilled water flow regulating valve is eliminated. When adjusting the flow, the black water circulation pump 5 (chilled water pump) frequency conversion can be adjusted through the DCS system for control. The operation is simple and stable, and the flow control can be realized by flow and frequency self-adjustment control, and the operation stability is greatly improved.
[0021] In the present application, the gasifier 2 is a reactor for water-coal slurry gasification, the internal reaction temperature is 1400-1550°C, the pressure is about 6.5MPa(G), and the chemical reaction rate is relatively fast under this high temperature and high pressure condition. The water-coal slurry gasification process uses pure oxygen and petroleum coke slurry as raw materials, adopts an entrained bed reactor, and performs partial oxidation reaction under pressurized non-catalytic conditions to generate a crude synthesis gas with carbon monoxide and hydrogen as effective components, which is used as the raw material gas for downstream chemical products.
[0022] In the present application, the main function of the quenching water is to wash and moisten the liquid slag and synthesis gas produced after the combustion of the gasifier 2. If the quenching water is cut off, the high-temperature synthesis gas produced by the combustion of the gasifier 2 will burn through the downcomer of the gasifier 2. The high-temperature synthesis gas passing through the outlet of the gasifier 2 will cause damage to the outlet pipeline and equipment. Therefore, the quenching water flow rate is included in the gasifier SIS trip interlock during the design. When the flow rate is low, the gasifier 2 will trip. The quenching water is drawn from the bottom of the water washing tower 4 by the black water circulation pump 5, and is pressurized by the black water circulation pump 5 and passed through the black water filter 7. After filtering out the larger particles, it is sent to the gasifier 2, and flows downward along the washing and cooling pipe together with the synthesis gas generated after combustion in the gasifier 2. After being cooled, the crude synthesis gas is washed and further cooled in the form of bubbles below the liquid level of the washing and cooling chamber, and leaves the gasifier 2 from the upper space of the washing and cooling chamber. The slag in the water bath of the washing and cooling chamber can be entrained into the lock bucket (3172-V-21001) after passing through the static slag breaker, and is regularly discharged to the slag pool (3172-T-21002). Fine ash and incompletely reacted carbon are suspended in the black water and are further processed with the black water to the slag water treatment process.
[0023] Finally, it should be noted that the present invention is not limited to the above embodiments, and there are many variations. All variations that can be directly derived or associated with the content disclosed by ordinary technicians in this field should be considered as the protection scope of the present invention.
Claims
1. A gasifier chilling water flow frequency conversion automatic control system, characterized in that: The invention comprises a gasifier (2) with a process burner (1), wherein the gasifier (2) is connected to the inlet end of a cyclone separator (3) through a pipeline, the outlet end at the top of the cyclone separator (3) is connected to the inlet end of a water washing tower (4) through a pipeline, the outlet end of the water washing tower (4) is connected to a quenching water flow meter (6) through a pipeline, and the quenching water flow meter (6) is connected to the gasifier (2) through a pipeline.
2. A gasification furnace quenching water flow frequency conversion automatic control system according to claim 1, characterized in that: The outlet end of the water washing tower (4) is connected to a black water circulation pump (5) via a pipeline, and the black water circulation pump (5) is connected to a quenching water flow meter (6) via a pipeline.
3. A gasification furnace quenching water flow frequency conversion automatic control system according to claim 1 or 2, characterized in that: The outlet end of the quenching water flow meter (6) is connected to a black water filter (7) via a pipeline, and the black water filter (7) is connected to the gasifier (2) via a pipeline.
4. The gasification furnace quenching water flow frequency conversion automatic control system according to claim 1 is characterized in that: The gasification furnace (2), the quenching water flow meter (6), and the black water circulation pump (5) are communicatively connected.