Automatic variable-frequency control system for flow of chilling water of gasification furnace

Abstract

The utility model discloses a gasification furnace chilling water flow variable-frequency automatic control system which comprises a gasification furnace combustion chamber, the bottom of the gasification furnace combustion chamber is connected with a downcomer, a gasification furnace chilling water chamber is wrapped outside the downcomer, the bottom of the downcomer is communicated with the gasification furnace chilling water chamber, and the downcomer is connected with the gasification furnace combustion chamber. The upper portion of the gasification furnace chilling water chamber is sequentially connected with a cyclone separator and a water washing tower through pipelines, the outlet end of the water washing tower is connected to the upper end of a downcomer through a first pipeline, and the first pipeline is connected with a chilling water pump capable of converting frequency. And the operation stability is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of gasifier quenching water flow frequency automatic control system, more specifically, it is a kind of control system, belong to petroleum chemical industry field. BACKGROUND

[0002] Current coal gasification industry is divided into two main categories, coal water slurry gasification and pulverized coal gasification, and a main process of coal water slurry gasification is quenching process, which mainly washes and cools synthetic gas and liquid slag after combustion by quenching water. Quenching water directly protects the downcomer in the gasifier, which is a very important control index for coal water slurry gasification.

[0003] In the coal water slurry gasification industry, the quenching water flow of the gasifier is controlled by remote control through black water angle valves or eccentric ball valves. During the later stage of gasifier operation, the valve core of the flow regulating valve is prone to erosion and wear, and severe jamming occurs, which makes it difficult for the valve to operate and adjust the flow, and the flow cannot be adjusted in the case of start-up and shutdown. This problem is difficult to operate, and in severe cases, it can directly burn through the downcomer in the gasifier, causing equipment and pipeline damage, synthetic gas short circuit, and other safety production accidents. SUMMARY

[0004] To solve the above-mentioned problems of the prior art, the utility model provides a gasifier quenching water flow frequency automatic control system with the technical features of simple structure, stable operation, reduced maintenance cost, and convenient control.

[0005] To achieve the above-mentioned purpose, the utility model is implemented by the following technical solutions:

[0006] A gasifier quenching water flow frequency automatic control system, comprising a gasifier combustion chamber, a downcomer connected to the bottom of the gasifier combustion chamber, a gasifier quenching water chamber wrapped around the outside of the downcomer, and a communication between the bottom of the downcomer and the gasifier quenching water chamber, an upper portion of the gasifier quenching water chamber connected in sequence by pipeline to a cyclone separator and a water scrubber, an outlet end of the water scrubber connected to the upper end of the downcomer by a first pipeline, and a quenching water pump capable of frequency conversion connected to the first pipeline.

[0007] Preferably, a valve group is also connected to the first pipeline to control the quenching water flow of the first pipeline.

[0008] Preferably, the valve group includes a pressure regulating valve and a solenoid valve, the quenching water pump is provided on the first pipeline at the outlet end of the water scrubber, one solenoid valve is provided on the first pipeline at each end of the quenching water pump, a flow meter is also connected to the first pipeline, the flow meter is in communication with the quenching water pump, and the pressure regulating valve is provided near the outlet end of the first pipeline.

[0009] Preferably, a buffer tank is connected to the first pipeline between the pressure regulating valve and the downcomer, and an electromagnetic valve is connected to the outlet end of the buffer tank.

[0010] Preferably, the first pipeline at the upper end of the downcomer is arranged in the downcomer through a ring line spray head to form a water film on the inner side of the downcomer for protection.

[0011] Preferably, a discharge pipeline with a stop valve is arranged at the bottom of the quenching water chamber of the gasification furnace.

[0012] Preferably, the flow meter, the quenching water pump and the valves are connected to a DCS controller.

[0013] Beneficial effects: simple structure, strong practicability, reduced operation cost; the traditional quenching water flow regulating valve is cancelled, and the original valve maintenance cost is reduced; the quenching water pump is controlled by frequency conversion, the operation stability is greatly improved, and the operation instability caused by valve wear and jamming due to long-period operation is reduced; the flow can be automatically controlled by frequency conversion of the quenching water pump; the quenching water flow can be adjusted and incorporated into the DCS control system in the traditional industry, and the quenching water pump is automatically tracked and adjusted according to the flow change. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION

[0015] The utility model is further described below in combination with the drawings of the specification, but the utility model is not limited to the following examples.

[0016] As Figure 1The embodiment is a kind of gasifier quenching water flow frequency automatic control system, which includes gasifier combustion chamber 1, the bottom of the gasifier combustion chamber 1 is connected with downcomer 2, the downcomer 2 is wrapped with gasifier quenching water chamber 3, and the bottom of the downcomer 2 is communicated with the gasifier quenching water chamber 3, the upper part of the gasifier quenching water chamber 3 is sequentially connected with cyclone 4 (traditional structure, the conical part of cyclone, the tangential velocity increases with the reduction of rotating radius, and the spiral motion is downward), water scrubber 5 through pipeline, the outlet end of the water scrubber 5 is connected at the upper end of the downcomer 2, and the quenching water pump 8 capable of frequency conversion is connected on the pipeline. A valve group is also connected on the pipeline for controlling the quenching water flow of the pipeline. The valve group includes pressure regulating valve and solenoid valve, the quenching water pump 8 is arranged on the pipeline at the outlet end of the water scrubber 5, a solenoid valve is arranged on the pipeline at the two ends of the quenching water pump 8, a flow meter 7 is also connected on the pipeline, the flow meter 7 is in communication connection with the quenching water pump 8, and the pressure regulating valve is arranged close to the outlet end of the pipeline.

[0017] The utility model uses the mode / process:

[0018] Pure oxygen and petroleum coke slurry are used as raw materials, partial oxidation reaction is carried out under pressurized non-catalytic conditions in the gasifier combustion chamber 1, and crude synthesis gas with carbon monoxide and hydrogen as effective components is generated, the gas temperature is as high as 1200-1450 DEG C, the gas is guided to the gasifier quenching water chamber 3 through the downcomer 2 for cooling and washing, and after being cooled and washed again through the cyclone 4 and the water scrubber 5, the qualified crude synthesis gas is finally sent to the downstream section. In order to avoid that the high-temperature gas with a temperature as high as 1450 DEG C directly contacts the downcomer 2 and damages the equipment, a layer of water film is formed on the inner side of the downcomer 2 by the quenching water for protection, the quenching water is extracted from the bottom of the washing tower 5 by the quenching water pump 8, is sent to the gasifier downcomer 2 after being pressurized, and is stabilized in flow by the control of the frequency conversion of the quenching water pump 8, the coordination of the flow meter 7 and the quenching water pump 8, the cancellation of the traditional flow regulating valve control, the solution of the problems of the valve core scouring and abrasion, serious jamming of the flow regulating valve in the later stage of the operation of the gasifier, the difficult valve action and the large flow fluctuation during flow regulation, the inability to regulate the flow during start-up and shutdown, and the difficult operation. The traditional black water circulating pump is replaced by the quenching water pump 8 capable of frequency conversion, the voltage required by the pump can be changed from 10000 V to 380 V before and after the transformation, the average power consumption of each quenching water pump 8 is reduced by 60 KW, further, the flow meter and the quenching water pump 8 are controlled by frequency conversion, are coordinated with the DCS controller, are easy to operate, are stable, the flow control can be realized by flow and frequency self-regulation control, and the operation stability is greatly improved.

[0019] Preferably, a buffer tank 6 is connected to the pipeline between the pressure regulating valve and the downcomer 2, and an electromagnetic valve is connected to the outlet end of the buffer tank 6, so that stable quenching water can be provided.

[0020] Preferably, the pipeline at the upper end of the downcomer 2 is arranged in the downcomer 2 through a ring line spray head to form a water film on the inner side of the downcomer 2 for protection, which is simple in structure and strong in practicability.

[0021] Preferably, the gasifier quenching water chamber 3 is provided with a discharge pipeline with a stop valve at the bottom, which is easy to discharge and has strong practicability.

[0022] Preferably, the flow meter 7, the quenching water pump 8 and each valve are connected to a DCS controller. The DCS controller is a mature existing technology, and the application utilizes several controls of the DCS controller. The following is an introduction to the DCS controller:

[0023] The DCS (Distributed Control System) controller is a traditional but still widely used industrial automation control technology. The principle of the DCS controller is based on the idea of decentralized control, centralized management and network communication. Each control station is connected through a communication network to realize centralized management of data and sharing of information. In the control process, the DCS controller adopts the closed-loop control principle, that is, according to the deviation between the set value and the process variable, the control amount is calculated through the control algorithm, and is output to the actuator, so that the process variable tends to approach the set value. Common control algorithms include PID control, fuzzy control, neural network control, etc. The application does not involve program scheme protection, and the application only utilizes the functions of the traditional DCS controller, and focuses on the layout of the structure, and does not require program control.

[0024] Finally, it should be noted that the present application is not limited to the above embodiments, but can have many variations. All variations that can be directly derived or inferred from the disclosed content by those of ordinary skill in the art should be considered within the scope of the present application.

Claims

1. A variable frequency automatic control system for quench water flow rate in a gasifier, characterized in that: The application relates to a gasifier combustion chamber (1) which is connected with a downcomer (2) at the bottom, the downcomer (2) is wrapped with a gasifier quenching water chamber (3), the downcomer (2) is communicated with the gasifier quenching water chamber (3) at the bottom, the upper part of the gasifier quenching water chamber (3) is sequentially connected with a cyclone separator (4) and a water washing tower (5) through pipelines, the outlet end of the water washing tower (5) is connected with the upper end of the downcomer (2) through a first pipeline, a variable-frequency quenching water pump (8) is connected with the first pipeline.

2. The variable frequency automatic control system for quench water flow of a gasifier according to claim 1, characterized in that: A valve group is further connected with the first pipeline for controlling the quenching water flow of the first pipeline.

3. The variable frequency automatic control system for quench water flow of a gasifier according to claim 2, characterized in that: The valve group comprises a pressure regulating valve and an electromagnetic valve, the quenching water pump (8) is arranged on the first pipeline at the outlet end of the water washing tower (5), an electromagnetic valve is arranged on the first pipeline at the two ends of the quenching water pump (8), a flowmeter (7) is further connected with the first pipeline, the flowmeter (7) is in communication connection with the quenching water pump (8), and the pressure regulating valve is arranged close to the outlet end of the first pipeline.

4. The variable frequency automatic control system for quench water flow of a gasifier according to claim 3, characterized in that: A buffer tank (6) is connected with the first pipeline between the pressure regulating valve and the downcomer (2), and an electromagnetic valve is connected with the outlet end of the buffer tank (6).

5. The variable frequency automatic control system for quench water flow of a gasifier according to any one of claims 1-4, characterized in that: The first pipeline at the upper end of the downcomer (2) is arranged in the downcomer (2) through a ring line spray head to form a water film on the inner side of the downcomer (2) for protection.

6. The variable frequency automatic control system for quench water flow of a gasifier according to claim 1, characterized in that: A discharge pipeline with a stop valve is arranged at the bottom of the gasifier quenching water chamber (3).

7. The variable frequency automatic control system for the quench water flow of a gasifier according to claim 4, characterized in that: The flowmeter (7), the quenching water pump (8) and the valves are all connected with a DCS controller.

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