Device and method for detecting boiler pollution discharge
阅读说明：本技术 锅炉排污检测的装置和方法 (Device and method for detecting boiler pollution discharge ) 是由 刘兰斌 马金星 吴贝 杨斌 朱建锋 黄丽波 李庭江 唐文凭 陈定乐 于 2019-09-12 设计创作，主要内容包括：本发明涉及蒸汽锅炉设备在线检测技术领域,更具体地说,它涉及锅炉排污检测的装置和方法,其技术方案要点是：在排污二次阀阀体上装设一支热电阻,将热电阻测量的信号接入锅炉DCS系统的排污画面,在锅炉定期排污过程中通过监测排污二次阀阀体温度上升情况,判断排污管路是否存在堵塞。具有检测准确、及时、方便和可避免锅炉因水质恶化而引起爆管事故发生的优点。(The invention relates to the technical field of on-line detection of steam boiler equipment, in particular to a device and a method for detecting boiler pollution discharge, and the technical scheme is as follows: a thermal resistor is arranged on a valve body of the secondary blowdown valve, a signal measured by the thermal resistor is connected to a blowdown picture of a boiler DCS system, and whether a blowdown pipeline is blocked or not is judged by monitoring the temperature rise condition of the valve body of the secondary blowdown valve in the periodic blowdown process of the boiler. The method has the advantages of accurate, timely and convenient detection and capability of avoiding the occurrence of pipe explosion accidents caused by water quality deterioration of the boiler.)
1. The utility model provides a boiler blowdown detection device which characterized in that: the boiler water-cooling wall lower header comprises a boiler water-cooling wall, wherein a water-cooling wall lower header is arranged on the outer side of the boiler water-cooling wall; the bottom of each water-cooled wall lower header is provided with 1 blow-off pipe, and each blow-off pipe is connected with 1 blow-off primary valve and 1 blow-off secondary valve in series to form 1 blow-off pipeline; the drain pipes are connected in parallel to form a branch drain pipeline; the branch sewage discharge pipeline is connected to the main sewage discharge pipeline in parallel; 1 thermal resistor is arranged on each blowdown secondary valve body; the thermal resistor is connected to the DCS system.
2. The boiler blow-off detection apparatus according to claim 1, wherein: and a blowdown electric valve is connected in series on the branch blowdown pipeline.
3. The boiler blow-off detection apparatus according to claim 1, wherein: and a main blowdown valve is connected in series on the main blowdown pipeline.
4. The boiler blow-off detection apparatus according to claim 1, wherein: the sewage discharge pipe is a seamless steel pipe, wherein the steel pipe of the main sewage discharge pipeline is a phi 76mm seamless steel pipe, and the rest steel pipes are phi 28mm seamless steel pipes; the nominal diameter of the blowdown primary valve, the blowdown secondary valve and the blowdown electrically operated valve is 20mm, and the nominal diameter of the blowdown main valve is 50 mm.
5. The boiler blow-off detection apparatus according to claim 1, wherein: 16 lower water-cooled wall headers, 16 blowdown primary valves and 16 blowdown secondary valves respectively; 16 thermal resistors are arranged; the number of the blowdown electrically operated valves is 4; the blowdown main valve is 1.
6. A method of boiler blow-down detection, comprising:
when periodic pollution discharge is not carried out, the temperature of the valve body is maintained at 40-60 ℃;
when the boiler is used for periodic pollution discharge, the temperature of the valve body is gradually increased to 250-300 ℃;
monitoring the temperature rise condition of the valve body of the secondary blowdown valve through a thermal resistor, and transmitting a temperature signal into a DCS (distributed control system);
judging whether the sewage discharge pipeline is blocked or not through system logic reasoning;
and when the blockage occurs, treating the blocked boiler blow-off pipe in combination with the scheduled boiler shutdown for maintenance.
7. The method for detecting boiler blow-off according to claim 6, wherein the valve body temperature is maintained at 40-60 ℃ when periodic blow-off is not performed, and the method comprises:
when periodic blowdown is not carried out, the blowdown electric valves at the blowdown main valve and four corners are in a closed state, the blowdown primary valve of the water-cooled wall lower header is fully opened, and the blowdown secondary valve is opened for 1/3 strokes.
8. The method for detecting the boiler blow-off according to claim 6, wherein the temperature of the valve body is gradually increased to 250-300 ℃ when the boiler carries out periodic blow-off, and the method comprises the following steps:
and (3) manually opening a main blowdown valve, and remotely opening the four-corner blowdown electric valves one by one through a boiler DCS (distributed control System) to blowdown.
Technical Field
The invention relates to the technical field of on-line detection of steam boiler equipment, in particular to a device and a method for on-line detection of regular pollution discharge pipeline blockage of a boiler.
Background
The boiler periodical pollution discharge is also called intermittent pollution discharge or bottom pollution discharge, and has the functions of removing water slag accumulated at the lower part of the boiler and soft sediments formed after phosphate treatment, ensuring that the boiler water is qualified in quality and water system pipelines are not corroded and leaked, and the pollution discharge is an important link of boiler water quality management.
At present, a method for manually and regularly measuring the temperature of a boiler blow-off valve in operation is adopted to detect and judge whether a blow-off pipeline is blocked, so that the problem that the quality of boiler water is reduced due to untimely detection, and further the water wall pipeline is corroded to cause the explosion of a boiler water wall is easily caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a device and a method for detecting the blockage of a periodic blowdown pipeline of a boiler on line. The method has the advantages of accurate, timely and convenient detection and capability of avoiding the occurrence of pipe explosion accidents caused by water quality deterioration of the boiler.
The technical purpose of the device is realized by the following technical scheme: the boiler water-cooling wall lower header comprises a boiler water-cooling wall, wherein a water-cooling wall lower header is arranged on the outer side of the boiler water-cooling wall; the bottom of each water-cooled wall lower header is provided with 1 blow-off pipe, and each blow-off pipe is connected with 1 blow-off primary valve and 1 blow-off secondary valve in series to form 1 blow-off pipeline; the drain pipes are connected in parallel to form a branch drain pipeline; the branch sewage discharge pipeline is connected to the main sewage discharge pipeline in parallel; each secondary blowdown valve assembly is provided with 1 thermal resistor; the thermal resistor is connected to the DCS system.
In one embodiment: and a blowdown electric valve is connected in series on the branch blowdown pipeline.
In one embodiment: and a main blowdown valve is connected in series on the main blowdown pipeline.
In one embodiment: the steel pipe is a seamless steel pipe, wherein the steel pipe of the main sewage draining pipeline is a phi 76mm seamless steel pipe, and the rest steel pipes are phi 28mm seamless steel pipes; the nominal diameter of the blowdown primary valve, the blowdown secondary valve and the blowdown electrically operated valve is 20mm, and the nominal diameter of the blowdown main valve is 50 mm.
In one embodiment: 16 lower water-cooled wall headers, 16 blowdown primary valves and 16 blowdown secondary valves respectively; 16 thermal resistors are arranged; the number of the blowdown electrically operated valves is 4; the blowdown main valve is 1.
A method of boiler blow-down detection, comprising:
when periodic pollution discharge is not carried out, the temperature of the valve body is maintained at 40-60 ℃;
when the boiler is used for periodic pollution discharge, the temperature of the valve body is gradually increased to 250-300 ℃;
monitoring the temperature rise condition of the valve body of the secondary blowdown valve through a thermal resistor, and transmitting a temperature signal into a DCS (distributed control system);
judging whether the sewage discharge pipeline is blocked or not through system logic reasoning;
and when the blockage occurs, treating the blocked boiler blow-off pipe in combination with the scheduled boiler shutdown for maintenance.
In one embodiment, the valve body temperature is maintained at 40-60 ℃ when the periodic blowdown is not performed, and the method includes:
when periodic blowdown is not carried out, the blowdown electric valves at the blowdown main valve and four corners are in a closed state, the blowdown primary valve of the water-cooled wall lower header is fully opened, and the blowdown secondary valve is opened for 1/3 strokes.
In one embodiment, when the boiler carries out periodic pollution discharge, the temperature of the valve body gradually rises to 250-300 ℃, and the method comprises the following steps:
and (3) manually opening a main blowdown valve, and remotely opening the four-corner blowdown electric valves one by one through a boiler DCS (distributed control System) to blowdown.
In conclusion, the invention has the following beneficial effects:
firstly, the detection is accurate;
secondly, detection is carried out in time;
thirdly, the detection is convenient;
fourthly, the occurrence of pipe explosion accidents caused by water quality deterioration of the boiler can be avoided.
Drawings
Fig. 1 is a system diagram of a boiler blow-down detecting apparatus according to the present invention.
In the figure: 1. a blowdown primary valve; 2. a secondary valve for sewage disposal; 3. a blowdown electric valve; 4. a main blowdown valve; 5. a water wall lower header; 6. a phi 28mm seamless steel tube; 7. a phi 76mm seamless steel pipe; 8. a thermal resistor; 9. and (4) water-cooled walls of the boiler.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, the boiler blow-off detection device system comprises a boiler water-cooling wall 9, a blow-off primary valve 1, a blow-off secondary valve 2, a blow-off electric valve 3, a blow-off main valve 4, a water-cooling wall
Specifically, the steel pipe is a seamless steel pipe, wherein the steel pipe of the main sewage draining pipeline is a phi 76mm seamless steel pipe 7, and the rest steel pipes are phi 28mm seamless steel pipes 6; the nominal diameter of the blowdown primary valve, the blowdown secondary valve and the blowdown electrically operated valve is 20mm, and the nominal diameter of the blowdown main valve is 50 mm. After the technical scheme is adopted, the sewage steel pipe has the advantages of corrosion resistance, acid, alkali, salt and atmospheric environment resistance and no need of regular maintenance, and the diameter of the sewage main trunk is larger and is more favorable for drainage.
Specifically, the number of the water wall
The using method of the invention is as follows:
in the normal operation process of the boiler, a main blowdown valve 4 with the nominal diameter of 50mm and electric blowdown valves 3 at four corners are in a closed state, a primary blowdown valve 1 of a lower
A thermal resistor 8 is arranged on each valve body of a blowdown secondary valve 2 with a nominal diameter of 20mm, a signal measured by the thermal resistor 8 is connected to a blowdown operation interface in a boiler DCS system, when the boiler normally operates and does not carry out periodical blowdown, furnace water in a blowdown pipeline is basically in a static state, the temperature of the valve bodies of the blowdown primary valve 1 and the blowdown secondary valve 2 is basically maintained at 40-60 ℃, when the boiler carries out periodical blowdown (lasting 10-15S), after the valve bodies of the blowdown primary valve 1 and the blowdown secondary valve 2 are continuously flushed by furnace water in a boiler water cooling wall 9, the temperature of the valve bodies is gradually increased to 250-300 ℃ (saturated water temperature under rated pressure), according to the characteristics, whether the blowdown pipeline is blocked or not can be judged by system logic reasoning during the periodical blowdown process, if the blockage occurs, a DCS picture is prompted, and (4) processing the boiler in combination with the scheduled boiler shutdown for maintenance.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
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