CN219063436U - Deaerator temperature control system for boiler - Google Patents

Abstract

The utility model relates to the technical field of boiler equipment, and discloses a deaerator temperature control system for a boiler, which comprises a softened water tank, a deaeration water tank for deaerating softened water and a PLC (programmable logic controller) for controlling the deaerator; the bottom of the softening water tank is provided with a drainage pipeline, the top of the deoxidizing water tank is provided with a deoxidizing tower head, the free end of the drainage pipeline is communicated with the deoxidizing tower head, the bottom of the deoxidizing water tank is provided with a water supply pipeline, the free end of the water supply pipeline is communicated with a boiler, the water supply pipeline is provided with a water supply pump, the boiler is provided with an exhaust pipeline, and the exhaust pipeline is communicated with the deoxidizing tower head. The utility model has simple structure, the temperature and the liquid level of the deoxidizing water tank are automatically controlled by the PLC, and the temperature of the deoxidizing water tank is controlled by the heat of the boiler, so that the deoxidizing effect is improved, the stable water supplementing of the deoxidizing tower head is realized, and the liquid level of the water tank always keeps high-liquid-level operation.

Description

Deaerator temperature control system for boiler

Technical Field

The utility model relates to the technical field of boiler equipment, in particular to a deaerator temperature control system for a boiler.

Background

The deaerator is one of the key equipment of the boiler and the heating system, such as poor deaeration capability of the deaerator, and serious corrosion is caused to a boiler water supply pipeline, an economizer and other auxiliary equipment, the economic loss caused by the deaerator is tens or hundreds of times of the manufacturing cost of the deaerator, so that the national electric department puts forward a partial standard for the oxygen content of the deaerator, namely the oxygen content of the water supply of the atmospheric deaerator should be less than 15 mu U/L, and the oxygen content of the water supply of the pressure deaerator should be less than 7 mu U/L. The deaerator is used for removing non-condensed gases such as oxygen, carbon dioxide and the like in the condensed water, heating the condensed water to a saturation temperature under the operating pressure of the deaerator, and storing the saturated water reaching the standard oxygen content in a water tank of the deaerator to meet the requirements of a boiler at any time, so that the safe operation of the boiler is ensured; in the boiler use process, the use condition of the deaerator is very harsh, and the requirements on the water inlet mixing temperature, the working temperature and the steam pressure are strict, and in addition, the stability of the deaerating tower head is greatly influenced by the liquid level change in the deaerating water tank.

In the prior art, when the deaerator is put into use, soft water needs to be timely supplied to the deaerating water tank, so that the liquid level in the deaerating tower head frequently fluctuates; when the water temperature in the existing deoxidizing water tank is lower than a required value, soft water cannot be heated in time, so that pipelines and equipment are easy to corrode; when the liquid level of the deoxidizing water tank is too high, the volume of the deoxidizing water tank is reduced, the steam inlet amount is unchanged, and the pressure is increased; the steam entering the deoxidizing water tank is less, so that the water temperature in the deoxidizing water tank is too low, the deoxidizing effect is influenced, and the deoxidizing water tank is easy to vibrate due to the too high liquid level of the deoxidizing water tank; when the liquid level of the deoxidizing water tank is too low, more steam enters the deoxidizing water tank, so that the internal steam pressure of the deoxidizing water tank is too high and is larger than the saturation pressure corresponding to the water temperature in the deoxidizer, and the deoxidizing effect is also affected.

Disclosure of Invention

The utility model aims to provide a deaerator temperature control system for a boiler, which aims to solve the technical problem of poor deaeration effect of deaerators.

In order to solve the problems, the basic scheme provided by the utility model is as follows: the deaerator temperature control system for the boiler comprises a softened water tank, a deaerator water tank for deaerating the softened water and a PLC controller; the water softening tank bottom is equipped with the drain line, deoxidization water tank top is equipped with deoxidization tower head, the free end and the deoxidization tower head intercommunication of drain line, deoxidization water tank bottom is equipped with the water supply line, the free end and the boiler intercommunication of water supply line, be equipped with the feed pump on the water supply line, the gas outlet of boiler is connected with branch cylinder, the intercommunication has the exhaust line between the gas outlet of branch cylinder and the deoxidization tower head.

The utility model has the working principle and beneficial effects that: when the device is used, firstly, the flow from the boiler to the deoxidizing tower head is opened, the boiler is put into use, then, the flow from the softening water tank to the deoxidizing tower head is opened, the water feeding pump is started, the soft water in the softening water tank is sent into the deoxidizing tower head through the drainage pipeline, the soft water enters the membrane rotating device water chamber of the deoxidizing tower head, and is obliquely and rotatably sprayed to the inner hole from the small hole of the membrane pipe under a certain liquid level difference to form jet flow, and as the inner hole is filled with rising heating steam, a large amount of heating steam is sucked and rolled in by water in the jet flow movement, and falls onto a liquid-vapor net arranged below the water tank in a uniform rain shape, and then, the soft water flows into the deoxidizing water tank after deep deoxidizing; according to the liquid level and temperature of the deoxidizing water tank, the temperature of the deoxidizing tower head is controlled by the PLC according to the process requirements and the heat of the boiler, and meanwhile, oxygen in soft water is removed, so that the deoxidizing efficiency is improved; the water in the deoxidizing tower head flows into the deoxidizing water tank, deoxidizing is further carried out by the deoxidizing water tank, and the deoxidized soft water is conveyed to the boiler by the water supply pipe, so that the deoxidizing efficiency of the water supply of the boiler is ensured.

And in the scheme II, the scheme is the optimization of the basic scheme, the exhaust pipe line is provided with a regulating valve, the deoxygenation water tank is provided with a temperature sensor, and the regulating valve and the temperature sensor are respectively and electrically connected with the PLC. When the temperature sensor monitors that the temperature of softened water in the deoxidizing water tank is lower than a set value, the temperature sensor sends an electric signal to the PLC controller, and the opening of the regulating valve is controlled by the PLC controller, so that steam enters the deoxidizing tower head through the heating pipeline to heat the softened water, the temperature of the softened water entering the deoxidizing tower head is conveniently and timely improved, and the deoxidizing efficiency is guaranteed.

The third scheme is the optimization of the second scheme, a soft water pump is arranged on the drain pipe, a frequency converter is arranged on the soft water pump, and the frequency converter is electrically connected with the PLC. The frequency converter is used for changing the rotating speed of the water pump to regulate the flow and pressure of the water pump, so that the softened water of the deoxidizing tower head is supplied.

The scheme IV is the optimization of the scheme III, a liquid level meter is arranged on the deoxidizing water tank, and the liquid level meter is electrically connected with the PLC. When the liquid level of the deoxidizing tower head is lower than the set value of the liquid level meter, an electric signal is sent by the liquid level meter and is transmitted to the PLC controller, the PLC controller transmits the signal to the frequency converter, the frequency converter sends a signal for starting the soft water pump, and the starting pump ensures the normal water supply of the water tank, so that the stable water supplementing of the deoxidizing tower head can be realized, and the liquid level of the water tank always keeps high liquid level operation; meanwhile, the liquid level of the water tank is not too low, so that a large amount of water is fed, the water temperature is affected to be reduced, the deoxidization effect is ensured, and the heat conduction efficiency of the boiler is improved.

The fifth scheme is the optimization of the fourth scheme, and a pressure relief valve is arranged at the top of the deoxidizing tower head. When the pressure in the deoxidizing tower head exceeds the set pressure of the pressure relief valve, the pressure relief valve can be automatically opened, so that the effect of protecting equipment is achieved.

Drawings

The utility model is further illustrated by the following figures and examples.

FIG. 1 is a schematic diagram of a deaerator temperature control system for a boiler in accordance with the present utility model;

FIG. 2 is a control flow chart of a deaerator temperature control system for a boiler according to the present utility model.

In the figure: a softening water tank 101; a drain line 102; a soft water pump 103; a deaeration water tank 201; an oxygen removal tower head 202; a water supply line 203; a feed water pump 204; a temperature sensor 205; a level gauge 206; a pressure relief valve 207; a boiler 301; a split cylinder 302; an exhaust line 303; and a regulating valve 304.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Please refer to fig. 1-2: the deaerator temperature control system for the boiler comprises a softened water tank 101, a deaerated water tank 201 and a PLC controller; the model of the PLC is S7-400, the bottom of the softened water tank 101 is provided with a drain line 102, the drain line 102 is provided with a soft water pump 103, the soft water pump 103 is provided with a frequency converter, the model of the frequency converter is AS170, and the frequency converter is electrically connected with the PLC; the top of the deoxidization water tank 201 is fixedly connected with a deoxidization tower head 202, a pressure release valve 207 is arranged at the top of the deoxidization tower head 202, the free end of the drainage pipeline 102 is communicated with the deoxidization tower head 202, a liquid level meter 206 is arranged in the deoxidization water tank 201, and the liquid level meter 206 is electrically connected with a PLC.

The bottom of the deoxidizing water tank 201 is provided with a water supply pipeline 203, the water supply pipeline 203 is provided with a water supply pump 204, the free end of the water supply pipeline 203 is communicated with a boiler 301, the air outlet of the boiler 301 is connected with a branch air cylinder 302, an exhaust pipeline 303 is communicated between the air outlet of the branch air cylinder 302 and the deoxidizing tower head 202, the exhaust pipeline 303 is provided with a regulating valve 304, the model of the regulating valve 304 is DZW-16C-25, and the regulating valve 304 is electrically connected with a PLC; the deaeration water tank 201 is provided with a temperature sensor 205, the model DS18B20 of the temperature sensor 205, and the temperature sensor 205 is electrically connected with the PLC.

The implementation manner of this example is as follows: when the boiler is used, the boiler 301 is firstly put into use, and the exhaust pipeline 303 of the boiler 301 discharges steam into the deoxidizing tower head 202 through the air dividing cylinder 302, so that the steam heats softened water in the deoxidizing tower head 202 and the deoxidizing water tank 201; then, starting the soft water pump 103, conveying soft water in the soft water tank 101 into the deoxidizing tower head 202 through the drain pipeline 102 by the soft water pump 103, heating and deoxidizing the deoxidizing tower head 202 by steam after the soft water enters the deoxidizing tower head 202, and starting the soft water pump 103 through a frequency converter by a PLC (programmable logic controller) when the liquid level of the deoxidizing water tank 201 is lower than a set value, so that the soft water pump 103 is controlled by the PLC to supply water to the deoxidizing water tank 201 through the frequency converter, and stopping supplying water to the deoxidizing water tank 201 by the soft water pump 103 through the frequency converter when the liquid level of the deoxidizing water tank 201 reaches the set value; when the temperature sensor 205 monitors that the temperature of the softened water in the deoxidizing water tank 201 is lower than a set value, the opening of the regulating valve 304 is controlled by the temperature sensor 205 through the PLC controller, so that the feeding amount of steam entering the deoxidizing tower head 202 is ensured, the temperature of the deoxidizing water tank 201 and the temperature of the softened water in the deoxidizing tower head 202 are ensured, and the deoxidizing efficiency is ensured.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top", "end", "one side", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Meanwhile, unless explicitly specified and limited otherwise, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and may be either fixedly connected, adjustably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

It will be apparent that the foregoing is only one embodiment, and not all embodiments, of the present utility model. Other modifications and equivalents of the present utility model, based on the embodiments of the present utility model, will be apparent to those of ordinary skill in the art without departing from the spirit and scope of the present utility model, and are intended to be encompassed in the scope of the appended claims.

Claims (5)

1. The utility model provides a deaerator temperature control system for boiler which characterized in that: comprises a softened water tank (101), a deoxidization water tank (201) for deoxidizing softened water and a PLC controller; the novel deaeration water tank is characterized in that a drainage pipeline (102) is arranged at the bottom of the softening water tank (101), a deaeration tower head (202) is arranged at the top of the deaeration water tank (201), the free end of the drainage pipeline (102) is communicated with the deaeration tower head (202), a water supply pipeline (203) is arranged at the bottom of the deaeration water tank (201), the free end of the water supply pipeline (203) is communicated with a boiler (301), a water supply pump (204) is arranged on the water supply pipeline (203), a gas outlet of the boiler (301) is connected with a gas separation cylinder (302), and a gas exhaust pipeline (303) is communicated between the gas outlet of the gas separation cylinder (302) and the deaeration tower head (202).

2. The deaerator temperature control system for a boiler according to claim 1, wherein: the deaeration water tank (201) is provided with a temperature sensor (205), and the air exhaust pipeline (303) is provided with a regulating valve (304), and the regulating valve (304) and the temperature sensor (205) are respectively and electrically connected with a PLC controller.

3. The deaerator temperature control system for a boiler according to claim 2, wherein: the water draining pipeline (102) is provided with a soft water pump (103), the soft water pump (103) is provided with a frequency converter, and the frequency converter is electrically connected with the PLC.

4. A deaerator temperature control system for a boiler according to claim 3, wherein: the deoxidizing water tank (201) is provided with a liquid level meter (206), and the liquid level meter (206) is electrically connected with the PLC.

5. The deaerator temperature control system for a boiler of claim 4, wherein: the top of the deoxidizing tower head (202) is provided with a pressure relief valve (207).

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