CN211345280U - A boiler heat deaerator system - Google Patents

Abstract

The utility model discloses a boiler heat oxygen-eliminating device system belongs to the boiler feedwater treatment field. A boiler heat deaerator system comprises a PLC (programmable logic controller) and a deaerator and further comprises a soft water tank, wherein a water outlet of the soft water tank is connected with a water inlet pipeline, one end, far away from the soft water tank, of the water inlet pipeline is connected with a water inlet end of the deaerator, a variable-frequency water feeding pump and a water inlet flow meter are arranged on the water inlet pipeline, and the variable-frequency water feeding pump and the water inlet flow meter are electrically connected with the PLC; the utility model discloses frequency conversion water-feeding pump changes the operating frequency according to the flowmeter of intaking, and frequency conversion water-feeding pump control water supply flow matches with the admission flow, avoids the inflow too big, and steam heating is insufficient to improve the deoxidization effect, the frequency conversion water-feeding pump starts and stops according to the liquid level height of level sensor monitoring, the frequency modulation of frequency conversion water-feeding pump, thereby improve deaerating plant's efficiency, the emission of having avoided a large amount of steam to make causes the energy extravagant.

Description

A boiler heat deaerator system

technical field

The utility model relates to the technical field of boiler feed water treatment, in particular to a boiler heat deaerator system.

Background technique

In the process of boiler feed water treatment, deoxidation is a very critical link; oxygen is the main corrosive substance in the feed water system and boiler, and oxygen in the feed water should be removed quickly, otherwise it will corrode the boiler feed water system and components, resulting in corrosion products Iron oxide will enter the boiler, deposit or adhere to the boiler tube wall and heating surface, forming iron scale with poor heat transfer, and corrosion will cause pits on the inner wall of the pipeline, and the resistance coefficient will increase; when the pipeline is seriously corroded, it will often occur Pipe burst accident; the deaerator came into being as the times require, and the deaerator is one of the indispensable equipment in the boiler feed water heating system; the dissolved oxygen in the water will cause serious corrosion of the boiler and related equipment, so it is necessary to remove the dissolved oxygen Possibly more to remove.

When the deaerator is deoxidizing, if the control of the steam intake and water intake is not accurate, a large amount of working steam will enter the atmosphere, and the deoxidization rate will be low; since the exhaust steam of the deaerator contains a lot of heat, if it is directly discharged, it will cause a large amount of heat. Waste of energy, consumption of more fuel, is not conducive to environmental protection.

Utility model content

The purpose of the utility model is to solve the problems in the prior art, and proposes a boiler heat deaerator system.

In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

A boiler heat deaerator system includes a PLC controller and a deaerator, and also includes a soft water tank, the water outlet of the soft water tank is connected with a water inlet pipeline, and one end of the water inlet pipeline away from the soft water tank is connected with the deaerator. The water inlet end of the oxygen device is connected, the water inlet pipeline is provided with a variable frequency feed pump and an inlet water flowmeter, and both the variable frequency feed pump and the water inlet flowmeter are electrically connected with the PLC controller;

The main steam inlet pipeline is arranged below the place where the deaerator is connected to the water inlet pipeline. The main steam inlet pipeline is provided with a main steam regulating valve and an inlet steam flowmeter. The main steam regulating valve and the inlet steam The flow meters are all electrically connected to the PLC controller;

The deaerator is provided with a liquid level sensor, a temperature sensor and a pressure sensor, and the liquid level sensor, temperature sensor and pressure sensor are all electrically connected with the PLC controller.

Preferably, an auxiliary heating coil is arranged inside the deaerator.

Preferably, an auxiliary heating steam pipeline is connected to the main steam inlet pipeline, an auxiliary steam regulating valve is arranged on the auxiliary heating steam pipeline, and the auxiliary steam regulating valve is electrically connected with the PLC controller, The auxiliary heating steam pipeline is connected to the inlet of the auxiliary heating coil.

Preferably, the soft water tank is provided with a soft water tank heating coil, and the inlet of the soft water tank heating coil is connected to the outlet of the auxiliary heating coil through a recovery steam pipeline.

Preferably, the soft water tank is provided with a soft water tank liquid level sensor, and the soft water tank liquid level sensor is electrically connected to the PLC controller.

Compared with the prior art, the utility model provides a boiler heat deaerator system, which has the following beneficial effects:

1. The boiler heat deaerator system is connected to the soft water tank through the deaerator through the water inlet pipeline. The water inlet pipeline of the deaerator is provided with a variable frequency feed pump and an inflow flow meter, and the variable frequency feed pump extracts the soft water in the soft water tank for transportation. The deaerator and the variable frequency feed pump change the operating frequency according to the water inlet flowmeter, and the variable frequency feed pump controls the feed water flow to match the inlet steam flow to avoid excessive water intake and insufficient steam heating, thereby improving the deoxidation effect. The liquid level monitored by the liquid level sensor is started and stopped, the frequency of the variable frequency feed pump is adjusted, and the start-stop logic is collected by the PLC controller to collect the relevant flow and liquid level signals, and complete through internal calculation;

The main steam inlet pipeline is connected with the deaerator, and the main steam regulating valve is set on the main steam inlet pipeline, which is opened and closed according to the pressure signal monitored by the pressure sensor. The upper part meets the incoming soft water and heats the incoming soft water, so that the oxygen in the water is released. The main steam regulating valve adjusts the valve opening according to the flow monitored by the inlet steam flowmeter to maintain the deaerator pressure within a certain range; The efficiency of the oxygen plant avoids the waste of energy caused by the emission of a large amount of steam.

Description of drawings

Fig. 1 is a system schematic diagram of a boiler heat deaerator system proposed by the utility model.

In the figure: 1. PLC controller; 2. Liquid level sensor; 3. Temperature sensor; 4. Pressure sensor; 5. Frequency conversion feed pump; 6. Inlet water flowmeter; 7. Main steam regulating valve; Valve; 9. Inlet steam flowmeter; 10. Soft water tank level sensor; 11. Auxiliary heating coil; 12. Soft water tank heating coil; 13. Water inlet pipeline; 14. Main steam inlet pipeline; 15. Auxiliary Heating steam pipeline; 16. Recovery steam pipeline; 17. Deaerator; 18. Soft water tank.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation , are constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

1, a boiler heat deaerator system includes a PLC controller 1 and a deaerator 17, and also includes a soft water tank 18. The water outlet of the soft water tank 18 is connected with a water inlet pipe 13, and the water inlet pipe 13 is far away from the soft water tank 18. One end is connected with the water inlet end of the deaerator 17, the water inlet pipeline 13 is provided with a variable frequency feed pump 5 and an inlet water flow meter 6, and the variable frequency feed pump 5 and the water inlet flow meter 6 are electrically connected with the PLC controller 1;

Below the deaerator 17 is connected to the water inlet pipeline 13, a main steam inlet pipeline 14 is arranged, and the main steam inlet pipeline 14 is provided with a main steam regulating valve 7 and an inlet steam flowmeter 9. The main steam regulating valve 7 and The inlet steam flow meters 9 are all electrically connected with the PLC controller 1;

The deaerator 17 is provided with a liquid level sensor 2, a temperature sensor 3 and a pressure sensor 4, and the liquid level sensor 2, the temperature sensor 3 and the pressure sensor 4 are all electrically connected to the PLC controller 1;

The deaerator 17 is communicated with the soft water tank 18 through the water inlet pipeline 13. The water inlet pipeline 13 of the deaerator 17 is provided with a variable frequency feed pump 5 and an inlet water flow meter 6, and the variable frequency feed pump 5 extracts the soft water in the soft water tank 18 for transportation. The deaerator 17, the variable frequency feed pump 5 change the operating frequency according to the influent flow meter 6, and the variable frequency feed pump 5 controls the feed water flow to match the intake steam flow, so as to avoid excessive water intake and insufficient steam heating, thereby improving the deoxidizing effect. The variable frequency feed pump 5 starts and stops according to the liquid level monitored by the liquid level sensor 2, the frequency of the variable frequency feed pump 5 is adjusted, and the start and stop logic is collected by the PLC controller 1. The relevant flow and liquid level signals are completed by internal calculation;

The main steam inlet pipeline 14 is connected to the deaerator 17, and the main steam regulating valve 7 is set on the main steam inlet pipeline 14, which is opened and closed according to the pressure signal monitored by the pressure sensor 4, and the steam enters the deaerator from below the water inlet. The deaerator 17 meets the incoming soft water at the upper part of the deaerator 17, and heats the incoming soft water, so that the oxygen in the water is separated out. The main steam regulating valve 7 adjusts the valve opening according to the flow monitored by the inlet steam flowmeter 9 to maintain the deaerator The pressure is within a certain range; thus, the efficiency of the deaerator is improved, and the energy waste caused by the discharge of a large amount of steam is avoided.

An auxiliary heating coil 11 is arranged inside the deaerator 17, an auxiliary heating steam pipeline 15 is connected to the main steam inlet pipeline 14, an auxiliary steam regulating valve 8 is arranged on the auxiliary heating steam pipeline 15, and the auxiliary steam regulating valve 8 It is electrically connected to the PLC controller 1, the auxiliary heating steam pipeline 15 is connected to the inlet of the auxiliary heating coil 11, the soft water tank 18 is provided with a soft water tank heating coil 12, and the inlet of the soft water tank heating coil 12 passes through the recovery steam pipeline 16 Connected to the outlet of the auxiliary heating coil 11, and the auxiliary heating steam pipeline 15 is connected to the auxiliary heating coil 11 inside the deaerator 17;

An auxiliary steam regulating valve 8 is arranged on the auxiliary heating steam pipeline 15 , and the steam enters the auxiliary heating coil 11 to reheat the soft water inside the deaerator 17 . When heated to 104°C, the oxygen in the water is separated out, so as to achieve the effect of deoxidation. The auxiliary steam regulating valve 8 monitors the water temperature of the deaerator 17 according to the temperature sensor 3 at the lower part of the deaerator 17, adjusts the opening size, and reduces the waste of steam. Improve oxygen removal efficiency;

The soft water tank heating coil 12 is arranged inside the soft water tank 18, which is connected to the auxiliary heating coil 11 through the recovery steam pipeline 16. The steam discharged by the auxiliary heating of the deaerator 17 enters the auxiliary heating in the soft water tank 18 through the recovery steam pipeline 16. Coil 11, the steam discharged from the auxiliary heating of the deaerator is used to heat the soft water in the soft water tank to improve the utilization rate of steam.

The soft water tank 18 is provided with a soft water tank liquid level sensor 10, and the soft water tank liquid level sensor 10 is electrically connected with the PLC controller 1, and can monitor the liquid level height of the soft water tank 18 in real time.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Equivalent replacement or modification of the new technical solution and its utility model concept shall be included within the protection scope of the present utility model.

Claims (5)

1. The boiler heat deaerator system comprises a PLC (programmable logic controller) 1 and a deaerator 17, and is characterized by further comprising a soft water tank 18, wherein a water outlet of the soft water tank 18 is connected with a water inlet pipeline 13, one end, far away from the soft water tank 18, of the water inlet pipeline 13 is connected with a water inlet end of the deaerator 17, a variable-frequency water feed pump 5 and a water inlet flow meter 6 are arranged on the water inlet pipeline 13, and the variable-frequency water feed pump 5 and the water inlet flow meter 6 are electrically connected with the PLC 1;

a main steam inlet pipeline (14) is arranged below the position where the deaerator (17) is connected with the water inlet pipeline (13), a main steam regulating valve (7) and a steam inlet flowmeter (9) are arranged on the main steam inlet pipeline (14), and the main steam regulating valve (7) and the steam inlet flowmeter (9) are electrically connected with the PLC (1);

be provided with level sensor (2), temperature sensor (3) and pressure sensor (4) in oxygen-eliminating device (17), level sensor (2), temperature sensor (3) and pressure sensor (4) all with PLC controller (1) electric property link to each other.

2. The boiler heat deaerator system of claim 1 characterized in that said deaerator (17) is internally provided with an auxiliary heating coil (11).

3. The boiler heat deaerator system of claim 2, characterized in that an auxiliary heating steam pipeline (15) is connected to the main steam inlet pipeline (14), an auxiliary steam regulating valve (8) is arranged on the auxiliary heating steam pipeline (15), the auxiliary steam regulating valve (8) is electrically connected to the PLC controller (1), and the auxiliary heating steam pipeline (15) is connected to the inlet of the auxiliary heating coil (11).

4. A boiler heat deaerator system according to claim 3, characterized in that a soft water tank heating coil (12) is provided in the soft water tank (18), and the inlet of the soft water tank heating coil (12) is connected to the outlet of the auxiliary heating coil (11) through a recovery steam line (16).

5. The boiler heat deaerator system of any one of claims 1 to 4, characterized in that a soft water tank level sensor (10) is provided in the soft water tank (18), and the soft water tank level sensor (10) is electrically connected with the PLC controller (1).

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