A steam and water chemical dosing system and an automatic control method

Abstract

The present invention provides a steam and water dosing system and an automatic control method, including the following steps: S1: Determine the working conditions; S2: Every 30 minutes, detect the specific conductivity of the feed water of the high-speed mixed bed and compare it with the set steam and water indexes; S3: According to the specific conductivity of the feed water of the high-speed mixed bed detected each time and the actual working conditions, adjust the frequency conversion of the condensate dosing pump; Only one adjustment is made within a time period, and comparison continues in the next time period until the steam and water indexes are qualified; S4: If the specific conductivity of the feed water of the high-speed mixed bed exceeds the normal range, the alarm module alarms to remind the operator to intervene. This application regularly monitors the steam and water index parameters, adjusts the frequency conversion of the steam and water dosing pump, keeps the steam and water indexes within the qualified range, and sets alarm information for the steam and water indexes. When the steam and water indexes are abnormal, it reminds the operator to intervene, so as to reduce the amount of operation of personnel and realize the automatic control of the steam and water dosing system.

Description

Technical Field

[0001] The present invention relates to the technical field of water and steam dosing in thermal power generation, and particularly to a water and steam dosing system and an automatic control method thereof. Background Art

[0002] The water and steam quality of a thermal power plant is an important parameter for operation control. For example, in order to increase the pH value of the boiler water in a thermal power plant, a certain amount of ammonia needs to be added to reduce the corrosion of the boiler equipment in the thermal power plant caused by the low pH value of the boiler water.

[0003] However, the current water and steam dosing control has the following defects:

[0004] 1) There are relatively many corresponding parameters for the water and steam indexes in a thermal power plant, each corresponding to the frequency conversion adjustment of its own dosing pump. However, after the frequency conversion adjustment of the dosing pump for the corresponding water and steam indexes, the change of the index parameters is seriously lagged. In practical applications, it will cause excessive frequency conversion adjustment of the dosing pump, and it is basically impossible to achieve automatic adjustment, and only manual adjustment and monitoring can be carried out according to operation experience.

[0005] 2) The above problems lead to the need for manual operation by staff to ensure the normal water and steam indexes during actual operation, and the water and steam indexes require personnel to monitor the parameters at any time, resulting in a large workload for personnel.

[0006] Therefore, an automatic control method for a water and steam dosing system is needed, which can monitor the water and steam index parameters, adjust the frequency conversion of the water and steam dosing pump, keep the water and steam indexes within the qualified range, and set alarm information for the water and steam indexes to remind the operating personnel to intervene when the water and steam indexes are abnormal, so as to reduce the operation amount of personnel. Summary of the Invention

[0007] To avoid the above problems existing in the prior art, the present invention designs a water and steam dosing system and an automatic control method to achieve ammonia addition to a high-speed mixed bed; monitor the water and steam index parameters, adjust the frequency conversion of the water and steam dosing pump, keep the water and steam indexes within the qualified range, and set alarm information for the water and steam indexes to remind the operating personnel to intervene when the water and steam indexes are abnormal, so as to reduce the operation amount of personnel.

[0008] To achieve the above object, the present invention provides the following technical solution: An automatic control method for a water and steam dosing system, used for adding ammonia to a high-speed mixed bed; the automatic control method for the water and steam dosing system includes the following steps:

[0009] S1: Determine the working condition;

[0010] S2: Every 30 minutes, detect the feed water specific conductivity of the high-speed mixed bed and compare it with the water and steam indexes;

[0011] S3: Adjust the frequency conversion of the condensate dosing pump according to the specific conductivity of the high-speed mixed-bed feed water detected each time and the actual working conditions. Only one adjustment is made within a time period, and comparison continues in the next time period until the water vapor index is qualified.

[0012] S4: If the specific conductivity of the high-speed mixed-bed feed water exceeds the normal range, the alarm module will give an alarm to remind the operator to intervene.

[0013] The present invention is further configured such that: the actual working conditions described in step S1 include the high-speed mixed bed not being put into operation, a single high-speed mixed-bed motorized valve being put into operation, and two high-speed mixed-bed motorized valves being put into operation; according to different working conditions, the frequency conversion of the condensate dosing pump is adjusted differently in step S3.

[0014] The present invention is further configured such that: in the working condition where the high-speed mixed bed is not put into operation, step S3 is specifically as follows:

[0015] S311: Set the base value DD of the specific conductivity of the high-speed mixed-bed feed water to 6.5 μs / cm, and set the frequency conversion command of the condensate dosing pump to 25%.

[0016] S312: When the specific conductivity of the high-speed mixed-bed feed water is between 6.2 μs / cm and 6.8 μs / cm, keep the frequency conversion of the condensate dosing pump unchanged (25%).

[0017] S313: Whenever the specific conductivity of the high-speed mixed-bed feed water > 6.9 μs / cm; automatically reduce the frequency conversion of the condensate dosing pump by 5%, with a delay of 1800S.

[0018] S314: Whenever the specific conductivity of the high-speed mixed-bed feed water < 6.2 μs / cm, automatically increase the frequency conversion of the condensate dosing pump by 5% with a delay of 1800S.

[0019] The present invention is further configured such that: in the working condition where a single high-speed mixed-bed motorized valve is put into operation, step S3 is specifically as follows:

[0020] S321: Set the base value DD of the specific conductivity of the high-speed mixed-bed feed water to 6.5 μs / cm, and set the frequency conversion command of the condensate dosing pump to 35%.

[0021] S322: When the specific conductivity of the high-speed mixed-bed feed water is between 6.2 μs / cm and 6.8 μs / cm, keep the frequency conversion of the condensate dosing pump unchanged (35%).

[0022] S323: Whenever the specific conductivity of the high-speed mixed-bed feed water > 6.9 μs / cm; automatically reduce the frequency conversion of the condensate dosing pump by 8%, with a delay of 1800S.

[0023] S324: Whenever the specific conductivity of the high-speed mixed-bed feed water < 6.2 μs / cm, automatically increase the frequency conversion of the condensate dosing pump by 8% with a delay of 1800S.

[0024] The present invention is further configured such that, under the condition that two of the high-speed mixed bed motor-operated valves are in operation, step S3 is specifically as follows:

[0025] S331: Set the base value DD of the specific conductivity of the high-speed mixed bed feed water to 6.5 μs / cm, and set the frequency conversion command of the condensate dosing pump to 60%;

[0026] S332: When the specific conductivity of the high-speed mixed bed feed water is between 6.2 μs / cm and 6.8 μs / cm, keep the frequency conversion of the condensate dosing pump unchanged (60%);

[0027] S333: Whenever the specific conductivity of the high-speed mixed bed feed water > 6.9 μs / cm, automatically reduce the frequency conversion of the condensate dosing pump by 10%, with a delay of 1800 S;

[0028] S334: Whenever the specific conductivity of the high-speed mixed bed feed water < 6.2 μs / cm, automatically increase the frequency conversion of the condensate dosing pump by 10% with a delay of 1800 S.

[0029] The present invention is further configured such that the upper limit of the frequency conversion of the condensate dosing pump is 90% and the lower limit is 15%; otherwise, the condensate dosing pump is locked

[0030] The present invention is further configured such that step S4 is specifically as follows: When the specific conductivity of the high-speed mixed bed feed water exceeds 5.5 μs / cm - 7.5 μs / cm, it is determined that the water vapor index is abnormal, and the alarm module is activated for alarm.

[0031] A water vapor dosing system applicable to the above automatic control method of a water vapor dosing system, the water vapor dosing system includes a distributed control module, a timing module, a dosing module, a high-speed mixed bed detection module, and an alarm module;

[0032] The dosing module is used to control and adjust the frequency conversion of the condensate dosing pump;

[0033] The dosing module is used to control and adjust the frequency conversion of the condensate dosing pump to dose the high-speed mixed bed;

[0034] The high-speed mixed bed detection module is used to judge the working condition of the high-speed mixed bed and detect the water vapor index parameters, generate an operation status signal, and transmit it to the distributed control module;

[0035] The timing module is used for timing, so that the distributed control module periodically compares the water vapor index parameters;

[0036] The distributed control module is electrically connected to the timing module, the dosing module, and the high-speed mixed bed detection module. The working condition of the high-speed mixed bed is detected by the high-speed mixed bed detection module, and the distributed control module controls the dosing module to perform water vapor dosing on the high-speed mixed bed. The high-speed mixed bed includes the #1 machine mixed bed and the #2 machine mixed bed.

[0037] The present invention is further configured such that: the high-speed mixed bed module includes a detection circuit for the motorized valve of the #1 machine mixed bed, a detection circuit for the motorized valve of the #2 machine mixed bed, a conductivity detection device for the #1 machine mixed bed, and a conductivity detection device for the #2 machine mixed bed;

[0038] The conductivity detection device for the #1 machine mixed bed and the conductivity detection device for the #2 machine mixed bed are respectively used to detect the feed water specific conductivity of the #1 machine mixed bed and the #2 machine mixed bed, and generate conductivity signals;

[0039] The #1 machine mixed bed and the #2 machine mixed bed each include two motorized valves for the high mixed bed effluent. The detection circuit for the motorized valve of the #1 machine mixed bed and the detection circuit for the motorized valve of the #2 machine mixed bed are used to detect the on / off states of the two motorized valves for the high mixed bed effluent of the #1 machine mixed bed and the #2 machine mixed bed, and generate motorized valve on / off signals.

[0040] The present invention is further configured such that: the chemical dosing module includes a chemical dosing device, a first condensate chemical dosing pump, a second condensate chemical dosing pump, and a third condensate chemical dosing pump; the chemical inlet ports of the first condensate chemical dosing pump, the second condensate chemical dosing pump, and the third condensate chemical dosing pump are respectively connected to the chemical dosing device; the first condensate chemical dosing pump and the third condensate chemical dosing pump are respectively electrically connected to the distributed control unit; the first condensate chemical dosing pump, the second condensate chemical dosing pump, and the third condensate chemical dosing pump are variable frequency pumps; the chemical outlet port of the first condensate chemical dosing pump is connected to the #1 machine mixed bed, and the chemical outlet port of the third condensate chemical dosing pump is connected to the #2 machine mixed bed.

[0041] That is, the first condensate chemical dosing pump controls the chemical dosing of the #1 machine mixed bed, and the third condensate chemical dosing pump controls the chemical dosing of the #2 machine mixed bed. If the first condensate chemical dosing pump and the third condensate chemical dosing pump fail, the second condensate chemical dosing pump is used for manual adjustment.

[0042] In summary, the beneficial effects of the above technical solutions of the present invention are as follows:

[0043] 1. By collecting the data of the conductivity detection device and performing variable frequency adjustment on the chemical dosing pump, automatic and precise control of the water vapor index of the chemical dosing pump in the water vapor chemical dosing system of a thermal power plant is achieved: using the timekeeping and statistical method, the water vapor index parameters are compared regularly. When there is a deviation between the actual value of the water vapor index and the normal value, the frequency of the chemical dosing pump is automatically adjusted to control the water vapor index within the normal value range.

[0044] 2. Solve the problem of lag in the change of water vapor index parameters in a thermal power plant: When the variable frequency of the water vapor chemical dosing pump changes, the water vapor index cannot change in a timely manner. Combining with daily adjustment experience, the water vapor index is compared regularly according to time statistics. The comparison of the steam-water index cannot be carried out all the time, otherwise the inverter will be adjusted excessively; only one adjustment is carried out within a time period, and the comparison continues in the next time period until the water vapor index is qualified.

[0045] 3. Abnormal alarm for steam-water index parameters is set: After putting it into automatic operation, the operators do not need to constantly monitor the steam-water parameters. Only when an abnormal alarm for the steam-water parameters occurs, manual intervention is required.

[0046] 4. Combined with the actual operating conditions of the unit: The adjustment of the steam-water index is divided into three operating conditions, and the adjustment of the steam-water index is different under each operating condition, making the automatic control of water and steam chemical dosing more accurate. Brief Description of the Drawings

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is the overall flowchart of the method described in the present invention;

[0049] Figure 2 It is the overall structural schematic diagram of Embodiment 2 of the present invention;

[0050] Figure 3 It is the schematic diagram of the connection relationship of each device in the chemical dosing module.

[0051] In the drawings, the list of components represented by each reference numeral is as follows:

[0052] 100 - Distributed control module, 200 - Timing module, 300 - Chemical dosing module, 400 - High-speed mixed bed detection module, 500 - Alarm module;

[0053] 301 - Chemical dosing device, 302 - First condensate chemical dosing pump, 303 - Second condensate chemical dosing pump, 304 - Third condensate chemical dosing pump. Detailed Embodiments

[0054] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application. In addition, the directional terms mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only references to the directions in the drawings. Therefore, the directional terms used are for illustration rather than limitation of the present invention.

[0055] The present invention will be further described below in conjunction with the drawings and preferred embodiments.

[0056] Embodiment 1:

[0057] Figure 1 The figure shows a flowchart of a preferred embodiment of the present invention, which is an automatic control method for a water vapor dosing system used to add ammonia to a high-speed mixed bed, including the following steps:

[0058] S1: Determine the working condition;

[0059] S2: Every 30 minutes, detect the specific conductivity of the feed water of the high-speed mixed bed and compare it with the set water vapor index;

[0060] S3: Adjust the frequency conversion of the condensate dosing pump according to the specific conductivity of the feed water of the high-speed mixed bed detected each time and the actual working condition; only one adjustment is made within a time period, and comparison continues in the next time period until the water vapor index is qualified;

[0061] S4: If the specific conductivity of the feed water of the high-speed mixed bed exceeds the normal range, the alarm module gives an alarm to remind the operator to intervene. When the specific conductivity of the feed water of the high-speed mixed bed exceeds the range value of 5.5 μs / cm - 7.5 μs / cm, it is determined that the water vapor index is abnormal, and the alarm module is started for alarm.

[0062] The actual working conditions described in step S1 include the high-speed mixed bed not being put into operation, a single high-speed mixed bed motorized valve being put into operation, and two high-speed mixed bed motorized valves being put into operation; according to different working conditions, the frequency conversion of the condensate dosing pump is adjusted differently in step S3.

[0063] In the case where the high-speed mixed bed is not put into operation, step S3 is specifically as follows:

[0064] S311: Set the base value DD of the specific conductivity of the feed water of the high-speed mixed bed to 6.5 μs / cm, and set the frequency conversion command of the condensate dosing pump to 25%;

[0065] S312: When the specific conductivity of the feed water of the high-speed mixed bed is between 6.2 μs / cm and 6.8 μs / cm, keep the frequency conversion of the condensate dosing pump unchanged;

[0066] S313: Whenever the specific conductivity of the feed water of the high-speed mixed bed > 6.9 μs / cm; automatically reduce the frequency conversion of the condensate dosing pump by 5%, with a delay of 1800S;

[0067] S314: Whenever the specific conductivity of the feed water of the high-speed mixed bed < 6.2 μs / cm, automatically increase the frequency conversion of the condensate dosing pump by 5% with a delay of 1800S.

[0068] In the case where a single high-speed mixed bed motorized valve is put into operation, step S3 is specifically as follows:

[0069] S321: Set the base value DD of the specific conductivity of the feed water of the high-speed mixed bed to 6.5 μs / cm, and set the frequency conversion command of the condensate dosing pump to 35%;

[0070] S322: When the specific conductivity of the feed water of the high-speed mixed bed is between 6.2 μs / cm and 6.8 μs / cm, keep the frequency conversion of the condensate dosing pump unchanged;

[0071] S323: Whenever the specific conductivity of the feed water of the high-speed mixed bed > 6.9 μs / cm; automatically reduce the frequency conversion of the condensate dosing pump by 8%, with a delay of 1800S;

[0072] S324: Whenever the specific conductivity of the feed water of the high-speed mixed bed < 6.2 μs / cm, automatically increase the frequency conversion of the condensate dosing pump by 8% with a delay of 1800S.

[0073] Under the condition that two of the electric valves of the high-speed mixed bed are in operation, step S3 is specifically as follows:

[0074] S331: Set the base value DD of the specific conductivity of the feed water of the high-speed mixed bed to 6.5 μs / cm, and set the frequency conversion command of the condensate dosing pump to 60%;

[0075] S332: When the specific conductivity of the feed water of the high-speed mixed bed is between 6.2 μs / cm and 6.8 μs / cm, keep the frequency conversion of the condensate dosing pump unchanged;

[0076] S333: Whenever the specific conductivity of the feed water of the high-speed mixed bed > 6.9 μs / cm; automatically reduce the frequency conversion of the condensate dosing pump by 10%, with a delay of 1800S;

[0077] S334: Whenever the specific conductivity of the feed water of the high-speed mixed bed < 6.2 μs / cm, automatically increase the frequency conversion of the condensate dosing pump by 10% with a delay of 1800S.

[0078] The upper limit of the frequency conversion of the condensate dosing pump is 90% and the lower limit is 15%, otherwise the condensate dosing pump is locked.

[0079] Embodiment 2:

[0080] As Figure 2 shown, a water vapor dosing system includes a distributed control module 100, a timing module 200, a dosing module 300, a high-speed mixed bed detection module 400, and an alarm module 500;

[0081] The dosing module 300 is used to control and adjust the frequency conversion of the condensate dosing pump to dose the high-speed mixed bed;

[0082] The high-speed mixed bed detection module 400 is used to judge the working condition of the high-speed mixed bed and detect the water vapor index parameters, generate an operating state signal, and transmit it to the distributed control module 100;

[0083] The timing module 200 is used for timing, so that the distributed control module 100 periodically compares the water vapor index parameters;

[0084] The described distributed control module 100 is electrically connected to the timing module 200, the chemical dosing module 300, and the high-speed mixed bed detection module 400. The high-speed mixed bed condition is detected by the high-speed mixed bed detection module 400, and the distributed control module 100 controls the chemical dosing module 300 to perform water vapor chemical dosing for the high-speed mixed bed. The high-speed mixed bed includes the #1 unit mixed bed and the #2 unit mixed bed.

[0085] The described high-speed mixed bed module 400 includes the #1 unit mixed bed motorized valve detection circuit, the #2 unit mixed bed motorized valve detection circuit, the #1 unit mixed bed conductivity detection device, and the #2 unit mixed bed conductivity detection device;

[0086] The #1 unit mixed bed conductivity detection device and the #2 unit mixed bed conductivity detection device are respectively used to detect the feed water specific conductivity of the #1 unit mixed bed and the #2 unit mixed bed, and generate conductivity signals;

[0087] The #1 unit mixed bed and the #2 unit mixed bed respectively include two high-mixed effluent motorized valves. The #1 unit mixed bed motorized valve detection circuit and the #2 unit mixed bed motorized valve detection circuit are used to detect the opening and closing states of the two high-mixed effluent motorized valves of the #1 unit mixed bed and the #2 unit mixed bed, and generate motorized valve opening and closing signals.

[0088] As Figure 3 shown, the described chemical dosing module 300 includes a chemical dosing device 301, a first condensate chemical dosing pump 302, a second condensate chemical dosing pump 303, and a third condensate chemical dosing pump 304; the inlet ports of the first condensate chemical dosing pump 302, the second condensate chemical dosing pump 303, and the third condensate chemical dosing pump 304 are respectively connected to the chemical dosing device 301; the first condensate chemical dosing pump 302 and the third condensate chemical dosing pump 304 are respectively electrically connected to the distributed control module 100; the first condensate chemical dosing pump 302, the second condensate chemical dosing pump 303, and the third condensate chemical dosing pump 304 are variable frequency pumps; the outlet port of the first condensate chemical dosing pump 302 is connected to the #1 unit mixed bed, and the outlet port of the third condensate chemical dosing pump 304 is connected to the #2 unit mixed bed.

[0089] That is, the first condensate chemical dosing pump 302 controls the chemical dosing of the #1 unit mixed bed, and the third condensate chemical dosing pump 304 controls the chemical dosing of the #2 unit mixed bed. If the first condensate chemical dosing pump 302 and the third condensate chemical dosing pump 304 fail, the second condensate chemical dosing pump 303 is used for manual adjustment.

[0090] Example 3:

[0091] Example 3 applies the method described in Example 1 to Example 2, as Figures 1-3As shown in the figure, the distributed control module 100 controls the first condensate dosing pump 302 to dose the #1 unit mixed bed; the third condensate dosing pump 304 to dose the #2 unit mixed bed. The control method of the first condensate dosing pump 301 is the same as that of the third condensate dosing pump. In this embodiment, the first condensate dosing pump 301 adds ammonia to the #1 unit mixed bed, and the working condition is that a single high-speed mixed bed electric valve is put into operation. The base value of the specific conductivity of the feed water of the #1 unit is set as DD = 6.5 μs / cm:

[0092] S1: The detection circuit of the high-speed mixed bed electric valve of the #1 unit detects the switch states of the two high-speed mixed bed effluent electric valves of the #1 unit, generates an electric valve switch signal, and determines that the working condition is that a single high-speed mixed bed electric valve is put into operation;

[0093] S2: The timing module 200 is used for timing. Every 30 minutes, the conductivity detection device of the #1 unit mixed bed detects the specific conductivity of the feed water of the high-speed mixed bed;

[0094] S3: The first condensate dosing pump 302 is set to a variable frequency command of 35%; when the specific conductivity of the feed water of the high-speed mixed bed is between 6.2 μs / cm and 6.8 μs / cm, the variable frequency of the first condensate dosing pump 302 is kept at 35% unchanged;

[0095] Whenever the specific conductivity of the feed water of the high-speed mixed bed > 6.9 μs / cm; the variable frequency of the first condensate dosing pump 302 is automatically decreased by 8%, with a delay of 1800S;

[0096] Whenever the specific conductivity of the feed water of the high-speed mixed bed < 6.2 μs / cm, the variable frequency of the first condensate dosing pump 302 is automatically increased by 8% with a delay of 1800S.

[0097] Adjustment is only carried out once within a time period, and comparison continues in the next time period until the water vapor index is qualified.

[0098] S4: When the specific conductivity of the feed water of the high-speed mixed bed exceeds the range value of 5.5 μs / cm - 7.5 μs / cm, it is determined that the water vapor index is abnormal, and the alarm module 500 is started for alarm.

[0099] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. An automatic control method for a steam and water dosing system, used for adding ammonia to a high-speed mixed bed; characterized in that, It includes the following steps: S1: Determine the working conditions; the actual working conditions include that the high-speed mixed bed is not put into operation, a single high-speed mixed bed motorized valve is put into operation, and two high-speed mixed bed motorized valves are put into operation; S2: Every 30 minutes, detect the specific conductivity of the feed water of the high-speed mixed bed and compare it with the set water vapor index; S3: Adjust the frequency conversion of the condensate dosing pump according to the specific conductivity of the feed water of the high-speed mixed bed detected each time and the actual working conditions; only one adjustment is made within a time period, and comparison continues in the next time period until the water vapor index is qualified; Under the condition that the high-speed mixed bed is not put into operation: S311: Set the base value DD of the specific conductivity of the feed water of the high-speed mixed bed to 6.5 μS / cm, and set the frequency conversion command of the condensate dosing pump to 25%; S312: When the specific conductivity of the feed water of the high-speed mixed bed is between 6.2 μS / cm and 6.8 μS / cm, keep the frequency conversion of the condensate dosing pump unchanged; S313: Whenever the specific conductivity of the feed water of the high-speed mixed bed > 6.9 μS / cm, automatically reduce the frequency conversion of the condensate dosing pump by 5% and delay for 1800 s; S314: Whenever the specific conductivity of the feed water of the high-speed mixed bed < 6.2 μS / cm, automatically increase the frequency conversion of the condensate dosing pump by 5% and delay for 1800 s; Under the condition that a single high-speed mixed bed motorized valve is put into operation: S321: Set the base value DD of the specific conductivity of the feed water of the high-speed mixed bed to 6.5 μS / cm, and set the frequency conversion command of the condensate dosing pump to 35%; S322: When the specific conductivity of the feed water of the high-speed mixed bed is between 6.2 μS / cm and 6.8 μS / cm, keep the frequency conversion of the condensate dosing pump unchanged; S323: Whenever the specific conductivity of the feed water of the high-speed mixed bed > 6.9 μs / cm, automatically reduce the frequency conversion of the condensate dosing pump by 8% and delay for 1800 s; S324: Whenever the specific conductivity of the feed water of the high-speed mixed bed < 6.2 μS / cm, automatically increase the frequency conversion of the condensate dosing pump by 8% and delay for 1800 s; Under the condition that two high-speed mixed bed motorized valves are put into operation: S331: Set the base value DD of the specific conductivity of the feed water of the high-speed mixed bed to 6.5 μS / cm, and set the frequency conversion command of the condensate dosing pump to 60%; S332: When the specific conductivity of the feed water of the high-speed mixed bed is between 6.2 μS / cm and 6.8 μS / cm, keep the frequency conversion of the condensate dosing pump unchanged; S333: Whenever the specific conductivity of the feed water of the high-speed mixed bed > 6.9 μS / cm, automatically reduce the frequency conversion of the condensate dosing pump by 10% and delay for 1800 s; S334: Whenever the specific conductivity of the feed water of the high-speed mixed bed < 6.2 μS / cm, automatically increase the frequency conversion of the condensate dosing pump by 10% and delay for 1800 s; S4: If the specific conductivity of the feed water of the high-speed mixed bed exceeds the normal range, the alarm module alarms to remind the operator to intervene.

2. The automatic control method of a water vapor dosing system according to claim 1, characterized in that, The upper limit of the frequency conversion of the condensate dosing pump is 90% and the lower limit is 15%, otherwise the condensate dosing pump is locked.

3. The automatic control method of a water vapor dosing system according to claim 1, characterized in that Step S4 is specifically that when the specific conductivity of the feed water of the high-speed mixed bed exceeds the range of 5.5 μS / cm - 7.5 μS / cm, it is judged that the water vapor index is abnormal, and the alarm module is started for alarm.

4. The automatic control method of a water vapor dosing system according to claim 1, characterized in that, The automatic control method of the water vapor dosing system is applied to a water vapor dosing system, which includes a distributed control module, a timing module, a dosing module, a high-speed mixed bed detection module, and an alarm module; The dosing module is used to control the variable frequency of the condensate dosing pump to dose the high-speed mixed bed; The high-speed mixed bed detection module is used to judge the working condition of the high-speed mixed bed and detect the water vapor index parameters, generate an operation state signal, and transmit it to the distributed control module; The timing module is used for timing, so that the distributed control module periodically compares the water vapor index parameters; The distributed control module is electrically connected to the timing module, the dosing module, and the high-speed mixed bed detection module. The working condition of the high-speed mixed bed is detected by the high-speed mixed bed detection module, and the distributed control module controls the dosing module to dose water vapor to the high-speed mixed bed. The high-speed mixed bed includes the #1 unit mixed bed and the #2 unit mixed bed.

5. The automatic control method of a steam and water dosing system according to claim 4, characterized in that, The high-speed mixed bed detection module includes a #1 unit mixed bed motorized valve detection circuit, a #2 unit mixed bed motorized valve detection circuit, a #1 unit mixed bed conductivity detection device, and a #2 unit mixed bed conductivity detection device; The #1 unit mixed bed conductivity detection device and the #2 unit mixed bed conductivity detection device are respectively used to detect the feed water specific conductivity of the #1 unit mixed bed and the #2 unit mixed bed, and generate a conductivity signal; The #1 unit mixed bed and the #2 unit mixed bed respectively include two high-mixed effluent motorized valves. The #1 unit mixed bed motorized valve detection circuit and the #2 unit mixed bed motorized valve detection circuit are respectively used to detect the opening and closing states of the two high-mixed effluent motorized valves of the #1 unit mixed bed and the #2 unit mixed bed, and generate a motorized valve opening and closing signal.

6. The automatic control method of a water vapor dosing system according to claim 5, characterized in that, The dosing module includes a dosing device, a first condensate dosing pump, a second condensate dosing pump, and a third condensate dosing pump; the inlet ports of the first condensate dosing pump, the second condensate dosing pump, and the third condensate dosing pump are respectively connected to the dosing device; the first condensate dosing pump and the third condensate dosing pump are respectively electrically connected to the distributed control unit; the first condensate dosing pump, the second condensate dosing pump, and the third condensate dosing pump are variable frequency pumps; the outlet port of the first condensate dosing pump is connected to the #1 unit mixed bed, and the outlet port of the third condensate dosing pump is connected to the #2 unit mixed bed.

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