CN210505824U - Demineralized water flow stabilizer for condensate fine treatment system - Google Patents
Demineralized water flow stabilizer for condensate fine treatment system Download PDFInfo
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- CN210505824U CN210505824U CN201920668350.3U CN201920668350U CN210505824U CN 210505824 U CN210505824 U CN 210505824U CN 201920668350 U CN201920668350 U CN 201920668350U CN 210505824 U CN210505824 U CN 210505824U
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Abstract
The utility model relates to a demineralized water constant current stabilizer for a condensate polishing system, a level meter is arranged on a buffer tank, a water outlet of the demineralized water tank is connected with a pipeline, a demineralized water pump is arranged on the pipeline, the conveying end of the pipeline is branched into two branches, one branch is led to the condensate polishing system, and an automatic valve and the buffer tank are arranged on the branch; the other branch is communicated with a condenser hot well; a fine treatment flushing and backwashing water pump is arranged on a pipeline between the buffer tank and the condensate fine treatment system; the fine treatment washing and backwashing water pump, the automatic valve, the first liquid level meter and the desalting water pump are all in communication connection. The buffer tank of setting has avoided the precision processing to wash and the inlet pressure fluctuation of backwash water pump, reduces leading filter backwash stage among the condensate precision processing system and mixes bed regeneration stage manual intervention at a high speed, effectively improves leading filter backwash and mixes bed regeneration's stability and continuity at a high speed, has practiced thrift the human cost.
Description
Technical Field
The utility model relates to a coal-fired unit condensate water processing technology field, specifically say, relate to a demineralized water current stabilizer for condensate water fine treatment system, be particularly useful for among the large-scale coal-fired unit of no condensate water moisturizing case.
Background
The condensed water is generally water condensed by cooling the steam generated by the boiler with circulating cooling water after the steam turbine applies work. At present, supercritical coal-fired units are all required to be provided with a condensate polishing system, the condensate polishing system generally comprises a front filter, a high-speed mixed bed, a regeneration system and an auxiliary system, and the working principle is as follows:
1) when the pressure difference of the inlet and the outlet of the front filter reaches a set value, starting a backwashing water pump to carry out automatic backwashing for about 15-20 minutes;
2) when the water production conductance of the high-speed mixing bed reaches a set value, the high-speed mixing bed needs to be switched off for regeneration; the regeneration step mainly comprises: switching off the operation, conveying the resin, separating and sending out the resin, replacing and regenerating the positive and negative resin, mixing the resin, conveying the resin and the like; the entire regeneration is a continuous process, requiring hundreds of steps over about 8 hours.
But in the actual operation process, the pressure of a backwashing water pump and a washing water pump in the condensate fine treatment system is unstable,usually, human intervention is needed to perform backwashing of a pre-filter and regeneration of a high-speed mixed bed in a condensate polishing system, in order to solve the problem, a condensate water replenishing tank is added in a coal-fired unit, and the volume of the condensate water replenishing tank is different according to the volume of the unit, for example: the volume of the condensed water replenishing tank required by the 300 MW-level unit is not less than 100m3The volume of the condensed water replenishing tank required by the 600 MW-level unit is not smaller than 300m3The volume of the condensed water replenishing tank required by the 1000 MW-level unit is not less than 500m3The brief control flow of backwashing and regeneration water in the condensate fine treatment system of the unit provided with the condensate water replenishing tank is as follows (see fig. 1):
1) the desalting water pump is linked with the desalting water tank and the condensate water replenishing tank in liquid level, wherein the desalting water pump is power frequency;
2) the fine treatment flushing and backwashing water pump is linked with the liquid level of the condensate water replenishing tank, when the pressure difference of the pre-filter reaches a set value, the fine treatment flushing and backwashing water pump is started to backwash the pre-filter, and the backwashing period of the pre-filter is about 15 minutes;
3) the fine treatment flushing and backwashing water pump is linked with the liquid level of the condensed water replenishing tank, and the flushing and backwashing water pump is started to convey desalted water to a regeneration system for replacement and the like in the regeneration stage of the high-speed mixed bed;
4) the fine treatment flushing and backwashing water pump is linked with the liquid level of the condensate water replenishing tank and is used for flushing, resin layering, resin conveying and the like in the high-speed mixed bed regeneration stage;
5) a high-speed mixed bed regeneration stage for about 8 hours;
6) the condensate water replenishing pump is linked with the condensate water replenishing tank and the liquid level of the condenser hot well, the condensate water replenishing pump is started to replenish desalted water for a thermodynamic system when the liquid level of the condenser hot well is lower than a set value, and the pump is stopped when the liquid level of the condenser hot well is high or the liquid level of the condensate water replenishing tank is low.
However, in recent years, in order to save land occupation, reduce investment and reduce system flow, many large coal-fired units are not provided with a condensate water replenishing tank, and the control flow of backwashing and regeneration water in a condensate fine treatment system of a condensate water replenishing tank-free unit is as follows (see fig. 2): the desalting water pump is variable frequency and is in linkage control with the desalting water tank, the condenser hot well and the condensate fine treatment system, when backwashing water of the prefilter and high-speed mixed bed regeneration water in the condensate fine treatment system are used, the condenser needs to replenish water, and when each main water point in a main plant needs to replenish water, the desalting water pump starts to supply water.
The condensate water supplementing tank is not arranged, so that investment can be effectively saved, the discharged land of a main workshop is saved, and the system flow is simplified, but when backwash water of a pre-filter and high-speed mixed bed regeneration water conflict with the water supplementing time of a condenser in a condensate fine treatment system, the inlet flow of a fine treatment flushing and backwashing water pump can be suddenly reduced under the action of the vacuum negative pressure of the common demineralized water main pipe and the condenser, and backwashing interruption of the pre-filter or high-speed mixed bed regeneration interruption is caused.
Taking a certain extension project in Jiangxi as an example, an old unit is provided with a condensed water supplementing tank, a newly-built unit is not provided with the condensed water supplementing tank, and in the debugging stage of a condensed water fine treatment system of the newly-built unit, the debugging node of the condensed water fine treatment system is delayed for about 1 month due to unstable pressure of backwashing and washing water pumps for fine treatment of condensed water. After the project is built, the regeneration stage in the condensate polishing system needs manual intervention, and backwashing and regeneration need to avoid the water replenishing period of the condenser as much as possible. Because the liquid level change regularity of the condenser hot well is small, a full-time monitoring disc is needed in the regeneration period of the condensate fine treatment system, the automation level of the system is greatly reduced, and human resources are wasted.
Therefore, it is necessary to design a demineralized water flow stabilizer for a condensate polishing system, which is used for a large coal-fired unit without a condensate water replenishing tank, so as to avoid the pressure fluctuation of inlets of backwashing and flushing water pumps in the condensate polishing system and reduce the human intervention of a backwashing stage and a high-speed mixed bed regeneration stage of a pre-filter in the condensate polishing system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design is reasonable, the perfect demineralized water current stabilizer who is arranged in condensate polishing system of system to give its working method, be particularly useful for among the large-scale coal-fired unit of no condensate moisturizing case.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a demineralized water current stabilizer for condensate polishing system, includes demineralized water case and demineralized water pump, its characterized in that: the automatic liquid level meter is mounted on the buffer tank and used for detecting the liquid level in the buffer tank; the water outlet of the desalting water tank is connected with a first pipeline, the desalting water pump is installed on the first pipeline, the conveying tail end of the first pipeline is branched into two branches, one branch is communicated to a condensate fine treatment system, and the automatic valve and the buffer tank are sequentially installed on the branch according to the water flow direction; the other branch is communicated with a condenser hot well, and a condensed water replenishing pump is arranged on the branch; a fine treatment flushing and backwashing water pump for conveying water in the buffer tank to the condensate fine treatment system is arranged on a pipeline between the buffer tank and the condensate fine treatment system; the fine treatment washing and backwashing water pump, the automatic valve, the first liquid level meter and the desalting water pump are all in communication connection.
Preferably, condenser hot well department is provided with No. two level gauges, No. two level gauges and condensate water make-up pump communication connection, condensate water make-up pump and demineralized water pump communication connection.
Preferably, the desalting water pump is provided with a bypass, and the bypass is also provided with the desalting water pump.
In order to solve the technical problem, the utility model discloses still provide another technical scheme: a working method of a demineralized water flow stabilizer for a condensate polishing system comprises the following steps: setting the flow rate of the fine treatment washing and backwashing water pump as Q, and selecting a buffer tank with the volume of (1/5-1/4) Q; the condensate fine treatment system comprises a pre-filter backwashing part and a regeneration system;
the working method comprises the following steps:
(1) through logic control, a regeneration step sequence waiting function is added in a condensate fine treatment system;
(2) when the backwashing part of the front filter and the regeneration system need water, the fine treatment flushing and backwashing water pump is started, the automatic valve is opened, the demineralized water pump is started to convey water, when the water does not need to be conveyed, the fine treatment flushing and backwashing water pump stops working, the demineralized water pump continues working until the liquid level in the buffer tank reaches the upper limit, then the demineralized water pump stops working, and the automatic valve is closed;
(3) the regeneration system communicates with a liquid level meter II arranged at the position of the condenser hot well, when the condenser hot well needs water supplement, the regeneration system enters a waiting mode after completing the step sequence being executed, the fine treatment flushing and backwashing water pump stops working, the desalting water pump continues working until the liquid level in the buffer tank reaches the upper limit, then the automatic valve is closed, and then the condensed water supplementing pump is started for supplying water to the condenser hot well.
Compared with the prior art, the utility model, have following advantage and effect: the buffer tank is arranged at the inlet of the fine treatment washing and backwashing water pump, and the volume of the buffer tank is far smaller than that of a condensate water replenishing tank required in the prior art, so that the investment is saved, and the waste land of a main factory building is saved; the buffer tank of setting has avoided the precision processing to wash and the entry pressure fluctuation of backwash water pump, reduces the leading filter backwash stage among the condensate precision processing system and mixes the artificial intervention in bed regeneration stage at a high speed, has effectively improved leading filter backwash and has mixed the stability and the continuity of bed regeneration at a high speed, has practiced thrift the human cost greatly.
Drawings
FIG. 1 is a schematic control flow diagram of backwash and regeneration water in a condensate polishing system of a unit provided with a condensate replenishing tank.
FIG. 2 is a schematic control flow diagram of backwashing and regeneration water in a condensate polishing system of a condensate-free water replenishing tank unit.
Fig. 3 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals: the system comprises a demineralized water tank 1, a demineralized water pump 2, a buffer tank 3, an automatic valve 4, a liquid level meter 5, a pipeline 6, a bypass 61, a condensate fine treatment system 7, a condenser hot well 8, a fine treatment flushing and backwashing water pump 9 and a condensate water replenishing pump 10.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 3, the present embodiment is a demineralized water flow stabilizer for a condensate polishing system, which comprises a demineralized water tank 1, a demineralized water pump 2, a buffer tank 3, an automatic valve 4 and a level meter 5. A level gauge 5 is installed on buffer tank 3 for detect the liquid level in buffer tank 3.
In this embodiment, the first pipeline 6 is connected to the water outlet of the demineralized water tank 1, the demineralized water pump 2 is installed on the first pipeline 6, the bypass 61 is further arranged at the demineralized water pump 2, and the demineralized water pump is also arranged on the bypass 61. The delivery end of the first pipeline 6 is branched into two branches, wherein one branch leads to a condensate fine treatment system 7, and an automatic valve 4 and a buffer tank 3 are sequentially arranged on the branch according to the water flow direction; the other branch is communicated with a condenser hot well 8, and a condensed water replenishing pump 10 is arranged on the branch; a second liquid level meter is arranged at the position of the condenser hot well 8 and is in communication connection with a condensed water replenishing pump 10, and the condensed water replenishing pump 10 is in communication connection with the demineralized water pump 2.
In this embodiment, a fine treatment flushing and backwashing water pump 9 for conveying water in the buffer tank 3 to the condensate fine treatment system 7 is installed on a pipeline between the buffer tank 3 and the condensate fine treatment system 7; the fine treatment flushing and backwashing water pump 9, the automatic valve 4, the first liquid level meter 5 and the desalting water pump 2 are in communication connection.
In this embodiment, the condensate polishing system 7 includes a pre-filter backwashing section and a regeneration system; according to a step sequence table of the regeneration system, the maximum water consumption of one step sequence of the regeneration system is a resin separation step sequence, the time consumption is different from 10 minutes to 15 minutes, and if the flow of a fine treatment washing and backwashing water pump 9 is Q, a buffer tank 3 with the volume of (1/5-1/4) Q is selected, and the water stored in the buffer tank can meet the end of the step sequence with the maximum water consumption. Taking a 600 MW-grade unit as an example, the fine treatment is performed by washing andthe flow rate of the backwashing water pump is about 100m3H, if a condensed water replenishing tank is arranged, the volume of the condensed water replenishing tank is not less than 300m3(ii) a According to the embodiment of the utility model, the volume of the buffer box is only 20-25m3And (4) finishing.
In this embodiment, the working method of the demineralized water flow stabilizer for the condensate polishing system includes the following steps: through logic control, a regeneration step sequence waiting function is added in a condensate fine treatment system; when the backwashing part of the front filter and the regeneration system need water, the fine treatment flushing and backwashing water pump 9 is started, the automatic valve 4 is opened, the desalting water pump 2 is started to convey water, when the water conveyance is not needed, the fine treatment flushing and backwashing water pump 9 stops working, the desalting water pump 2 continues working until the liquid level in the buffer tank 3 reaches the upper limit, then the desalting water pump 2 stops working, and the automatic valve 4 is closed; the regeneration system communicates with a liquid level meter II arranged at the position of the condenser hot well 8, when the condenser hot well 8 needs water supplement, the regeneration system enters a waiting mode after completing the step sequence being executed, the fine processing flushing and backwashing water pump 9 stops working, the desalting water pump 2 continues working until the liquid level in the buffer tank 3 reaches the upper limit, then the automatic valve 4 is closed, and then the condensed water supplementing pump 10 is started for supplying water to the condenser hot well 8.
Practical application case 1.
In the expansion project of a certain thermal power plant in the west of the river, an old unit is provided with a condensed water supplementing tank, a newly-built unit is not provided with the condensed water supplementing tank, and in the debugging stage of a condensed water fine treatment system of the newly-built unit, the debugging node of the condensed water fine treatment system is delayed for about 1 month due to unstable pressure of a backwashing pump and a flushing water pump for the fine treatment of the condensed water. After the project is built, manual intervention is needed for regeneration of the condensate polishing system, and backwashing and regeneration are conducted to the greatest extent so as to avoid the water replenishing time period of the condenser. Because the liquid level change regularity of the condenser hot well is small, a full-time monitoring disc is needed in the regeneration period of the condensate fine treatment system, the automation level of the system is greatly reduced, and human resources are wasted.
Adopt the embodiment of the utility model provides an in after the technological transformation that provides, wherein the volume of baffle-box is 25m3Effectively avoiding backwashing and retreatment of a condensate polishing systemThe problem of interruption is solved, manual nursing is needed only in the acid-base replacement stage, the regeneration automation level is greatly improved, and the labor cost is reduced.
Practical application case 2.
In a certain built unit in Hubei, a condensate water replenishing tank is not arranged in the unit, so that the pressure fluctuation of the inlet of a condensate water fine treatment backwashing and flushing water pump is large, the regeneration of a condensate water fine treatment system is often interrupted due to the conflict between the regeneration and the water replenishing time period of a condenser, and the liquid level change regularity of a hot well of the condenser is small, so that the full-time monitoring is needed in the regeneration time period of the condensate water fine treatment system, the automation level of the system is greatly reduced, and the manpower resource is wasted.
Adopt the embodiment of the utility model provides an in after the technological transformation that provides, wherein the volume of baffle-box is 30m3The problem of regeneration interruption caused by water replenishing time interval conflict is effectively solved, the regeneration automation level is greatly improved, and the labor cost is reduced.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (3)
1. The utility model provides a demineralized water current stabilizer for condensate polishing system, includes demineralized water case (1) and demineralized water pump (2), its characterized in that: the automatic liquid level detection device is characterized by further comprising a buffer tank (3), an automatic valve (4) and a first liquid level meter (5), wherein the first liquid level meter (5) is mounted on the buffer tank (3) and used for detecting the liquid level in the buffer tank (3); a first pipeline (6) is connected to a water outlet of the desalting water tank (1), the desalting water pump (2) is installed on the first pipeline (6), the conveying tail end of the first pipeline (6) is branched into two branches, one branch is communicated to a condensate polishing system (7), and an automatic valve (4) and a buffer tank (3) are sequentially installed on the branch according to the water flow direction; the other branch is led to a condenser hot well (8), and a condensed water replenishing pump (10) is arranged on the branch; a fine treatment flushing and backwashing water pump (9) for conveying water in the buffer tank (3) to the condensate fine treatment system (7) is arranged on a pipeline between the buffer tank (3) and the condensate fine treatment system (7); the fine treatment washing and backwashing water pump (9), the automatic valve (4), the first liquid level meter (5) and the demineralized water pump (2) are in communication connection.
2. The demineralized water flow stabilizer for condensate polishing system of claim 1 wherein: the condenser hot well (8) is provided with a second liquid level meter, the second liquid level meter is in communication connection with a condensed water replenishing pump (10), and the condensed water replenishing pump (10) is in communication connection with a demineralized water pump (2).
3. The demineralized water flow stabilizer for condensate polishing system of claim 1 wherein: a bypass (61) is arranged at the desalting water pump (2), and the desalting water pump is also arranged on the bypass (61).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110182990A (en) * | 2019-05-10 | 2019-08-30 | 华电电力科学研究院有限公司 | A kind of demineralized water constant-current stabilizer and its working method for condensed water precision processing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110182990A (en) * | 2019-05-10 | 2019-08-30 | 华电电力科学研究院有限公司 | A kind of demineralized water constant-current stabilizer and its working method for condensed water precision processing system |
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