CN-116164902-B - Water leakage monitoring method and device for copper smelting waste heat boiler

CN116164902BCN 116164902 BCN116164902 BCN 116164902BCN-116164902-B

Abstract

The invention provides a method and a device for monitoring water leakage of a copper smelting waste heat boiler, which comprise the steps of obtaining an average value of water supply in a plurality of time periods, obtaining an average value of evaporation capacity in a plurality of time periods, determining a monitoring value based on the average value of the water supply, the average value of the evaporation capacity, the average value of pollution discharge capacity and the average value of sampling capacity, determining whether the boiler leaks or not based on the monitoring value and an alarm threshold, if so, sending a water balance alarm signal, finding a leakage point of the waste heat boiler in the first time, improving the intrinsic safety level of equipment, and reducing the maintenance difficulty of maintenance operators.

Inventors

Wu Fawei
LI JIANCHUN
CHEN ENLIN
GAO RONG
LIU XINGWEN
WANG CHANGHUI
CHEN JIAN
LI FABIAO
WANG FUQIANG
LI RUYUN
ZHAO BI
ZOU YONG
ZHANG YUYUN
XI JUN
Yuan Binxiong

Assignees

凉山矿业股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230131

Claims (5)

1. The method for monitoring the water leakage of the copper smelting waste heat boiler is characterized by comprising the following steps of: the method for obtaining the average value of the water supply quantity in a plurality of time periods comprises the following steps of: Collecting a water supply signal; performing configuration and data integration processing on the water supply signal to obtain a current water supply flow accumulated value; acquiring historical water supply flow accumulated values before a plurality of set times, wherein the historical water supply flow accumulated values are obtained through a DT function block of a DCS operation system of the waste heat boiler; Dividing the difference between the current water supply flow accumulated value and the historical water supply flow accumulated value by the corresponding accumulated time to obtain the average value of the water supply quantity in the time period; obtaining an average value of evaporation amounts in a plurality of time periods, including: Collecting a steam evaporation capacity signal; The steam evaporation quantity signal is configured and subjected to temperature and pressure compensation to obtain a compensation steam quantity value, wherein the compensation steam quantity value is a value obtained by carrying out compensation calculation on the steam flow; Integrating the compensation steam flow value to obtain a current steam flow accumulated value; Acquiring historical steam flow accumulated values before a plurality of set times; obtaining an average value of evaporation capacity in a plurality of time periods based on the difference value between the current steam flow accumulated value and the historical steam flow accumulated value; Determining a monitoring value based on the average value of the water supply amount, the average value of the evaporation amount, the average value of the sewage discharge amount and the average value of the sampling amount, wherein the monitoring value is a difference value between the average value of the water supply amount and the sum of the average value of the evaporation amount, the average value of the sewage discharge amount and the average value of the sampling amount; Determining whether the boiler leaks or not based on the monitoring value and the alarm threshold value; If yes, a water balance alarm signal is sent out.
2. The method for monitoring water leakage of a copper smelting waste heat boiler according to claim 1, wherein determining whether the boiler leaks based on the monitoring value and an alarm threshold value comprises: and when the monitoring value of a certain time period is larger than the alarm threshold value, determining that the boiler leaks, and sending out an alarm signal, otherwise, determining that the boiler does not leak, and continuing to monitor.
3. The water leakage monitoring device of the copper smelting waste heat boiler is characterized by comprising a water supply flow monitoring module, a steam pressure acquisition module, a steam temperature acquisition module and a distributed control system; The water supply flow monitoring module is in communication connection with the decentralized control system and is used for acquiring the average value of water supply in a plurality of time periods; the input of the first integrator is a water supply signal, and the output of the first integrator is a current water supply flow accumulated value; The input of the first time delay unit is the current water supply flow accumulated value and a plurality of set times, and the output is a historical water supply flow accumulated value; the input of the first subtracter is the current water supply flow accumulated value and the historical water supply flow accumulated value; The input of the first divider is the output of the first subtractor and the plurality of set times, and the output is the average value of the water supply quantity in a plurality of time periods; The steam flow monitoring module, the steam pressure acquisition module and the steam temperature acquisition module are in communication connection with each other and are respectively in communication connection with the distributed control system and used for acquiring the average value of evaporation capacity in a plurality of time periods; The input of the temperature and pressure compensation unit comprises a steam evaporation capacity signal, a steam pressure signal and a steam temperature signal, and the output is a compensation steam flow value; the input of the second integrator is the compensation steam flow value, and the output is the current steam flow accumulated value; The input of the second time delay unit is the current steam flow accumulated value and a plurality of set times, and the output is a historical steam flow accumulated value; the input of the second subtracter is the current steam flow accumulated value and the historical steam flow accumulated value; the input of the second divider is the output of the second subtractor and the set times, and the output is the average value of evaporation capacity in a plurality of time periods; The distributed control system is used for determining a monitoring value based on the average value of the water supply quantity, the average value of the evaporation quantity, the average value of the sewage discharge quantity and the average value of the sampling quantity, determining whether a boiler leaks water or not based on the monitoring value and an alarm threshold value, and if so, sending out a water balance alarm signal, wherein the monitoring value is a difference value of the sum of the average value of the water supply quantity and the average value of the evaporation quantity, the average value of the sewage discharge quantity and the average value of the sampling quantity.
4. The copper smelting waste heat boiler water leakage monitoring device according to claim 3, wherein the decentralized control system comprises a water balance alarm module, and the water balance alarm module comprises an adder, a third subtracter and a comparison unit; the input of the adder comprises an average value of evaporation capacity, an average value of pollution discharge capacity and an average value of sampling capacity; The input of the third subtracter is the average value of the output of the adder and the water supply quantity, and the output is a monitoring value; the input of the comparison unit is the monitoring value and the alarm threshold value, and the output is a water balance alarm signal.
5. The water leakage monitoring device for the copper smelting waste heat boiler according to claim 4, wherein the step of sending out the water balance alarm signal is to determine that the boiler leaks when the monitoring value of a certain time period is greater than the alarm threshold value and send out the alarm signal, and otherwise, determine that the boiler does not leak water and continue monitoring.

Description

Water leakage monitoring method and device for copper smelting waste heat boiler Technical Field The invention relates to the technical field of waste heat boiler water leakage monitoring, in particular to a copper smelting waste heat boiler water leakage monitoring method and device. Background Slight internal leakage occurs in the waste heat boiler, because the leakage point is smaller and occurs in the boiler flue, under the working condition of complex flue gas on site, an operator cannot detect the problem by means of the existing detection means, a small amount of leaked steam-water mixture in the process reacts with flue gas and dust in the boiler flue, a boiler pipeline near the leakage point is thinned due to reactants, the influence area is gradually enlarged along with delay of the discovery time and gradual increase of the leakage point, and the operator can perform emergency treatment through sensory discovery accidents until a large amount of steam-water mixture leakage occurs. But the time of internal leakage is a few hours or even a few days, and with the delay of the discovery time, a small leakage accident is expanded to a large-area thinning accident of the boiler pipe wall, so that a large-area boiler pipe is scrapped. In view of the above, the invention provides a method and a device for monitoring water leakage of a copper smelting waste heat boiler, which are used for finding out leakage points of the waste heat boiler at the first time, improving the intrinsic safety level of equipment and reducing the maintenance difficulty of maintenance operators. Disclosure of Invention The invention aims to provide a water leakage monitoring method for a copper smelting waste heat boiler, which comprises the steps of obtaining an average value of water supply in a plurality of time periods, obtaining an average value of evaporation capacity in a plurality of time periods, determining a monitoring value based on the average value of the water supply, the average value of the evaporation capacity, the average value of sewage discharge capacity and the average value of sampling capacity, determining whether the boiler leaks or not based on the monitoring value and an alarm threshold, and if so, sending out a water balance alarm signal. Further, the method for obtaining the average value of the water supply quantity in a plurality of time periods comprises the steps of collecting water supply quantity signals, carrying out configuration and data integration processing on the water supply quantity signals to obtain current water supply flow rate accumulated values, obtaining historical water supply flow rate accumulated values before a plurality of set time periods, and obtaining the average value of the water supply quantity in a plurality of time periods based on the difference value between the current water supply flow rate accumulated values and the historical water supply flow rate accumulated values. Further, the method comprises the steps of acquiring steam evaporation quantity signals, performing configuration and temperature and pressure compensation on the steam evaporation quantity signals to obtain compensation steam flow values, performing integral processing on the compensation steam flow values to obtain current steam flow accumulated values, acquiring historical steam flow accumulated values before a plurality of set times, and obtaining the average value of the evaporation quantity in a plurality of time periods based on the difference value between the current steam flow accumulated values and the historical steam flow accumulated values. Further, the monitoring value is a difference value between the average value of the water supply amount and the sum of the average value of the evaporation amount, the average value of the sewage discharge amount and the average value of the sampling amount. Further, the method for determining whether the boiler leaks water based on the monitoring value and the alarm threshold value comprises the steps of determining that the boiler leaks water when the monitoring value of a certain time period is larger than the alarm threshold value and sending out an alarm signal, and otherwise, determining that the boiler does not leak water and continuing monitoring. The invention aims to provide a water leakage monitoring device of a copper smelting waste heat boiler, which comprises a water supply flow monitoring module, a steam pressure acquisition module, a steam temperature acquisition module and a distributed control system, wherein the water supply flow monitoring module is in communication connection with the distributed control system and is used for acquiring the average value of water supply quantity in a plurality of time periods, the steam flow monitoring module, the steam pressure acquisition module and the steam temperature acquisition module are in communication connection with each other and are respectively in communication connection with