A desulfurization double slurry supply system automatic control method, system and related equipment

Abstract

This invention provides an automatic control method and system for a desulfurization dual slurry supply system. It tracks the SO2 concentration in the clean flue gas by setting the output flow rate of the high-efficiency desulfurizing agent slurry supply equipment in the system, and tracks the pH value of the desulfurization tower slurry by setting the output flow rate of the limestone slurry supply equipment in the same system. This invention automatically controls the SO2 concentration in the clean flue gas using the high-efficiency desulfurizing agent and automatically controls the pH value of the desulfurization tower slurry using the pH buffering characteristics of the limestone desulfurizing agent. This solves the drawback of a single slurry supply method being unable to simultaneously coordinate the control of the two parameters, ultimately achieving precise control of the two important parameters of the desulfurization system. Simultaneously, a PID control strategy is employed to automate the slurry preparation and supply processes, eliminating the need for manual start / stop of the raw material pump and the slurry supply pump during these processes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of limestone desulfurization process in thermal power plants, and particularly relates to a desulfurization double slurry supply system automatic control method, system and related equipment. BACKGROUND

[0002] The desulfurization double slurry supply system belongs to a new high-efficiency desulfurization process, and both the slurry preparation and slurry supply are in the initial application stage, and mainly still rely on the most original manual operation mode. That is, in terms of slurry preparation, in addition to the aforementioned manual operation of limestone slurry preparation, the operation personnel also need to manually prepare the high-efficiency desulfurization agent, including starting and stopping the high-efficiency desulfurization agent stock solution pump, opening and closing the high-efficiency desulfurization agent dilution water flow regulating valve, etc.; in terms of slurry supply, the opening degree of the limestone slurry regulating valve and the high-efficiency desulfurization agent flow regulating valve is manually adjusted respectively to adjust the SO2 content of the clean flue gas, or the frequency of the frequency converter is changed to adjust the rotating speed of the limestone slurry supply pump and the high-efficiency desulfurization agent supply pump, so as to adjust the slurry supply flow, and then adjust the SO2 content of the clean flue gas.

[0003] Although the desulfurization double slurry supply system has higher desulfurization efficiency, the judgment and manual adjustment of the slurry supply amount of the two slurry supply systems are completely performed by manual operation, which is labor-intensive, including the slurry preparation and slurry supply operation of the limestone slurry and the high-efficiency desulfurization agent system, the coordinated control of the desulfurization tower slurry pH value and the SO2 content of the clean flue gas, etc. If the operation of the two slurry supply systems is not timely or the control is not proper, the following situations may occur: when the high-efficiency desulfurization agent is excessive, the pH value of the desulfurization tower slurry is falsely high, the gypsum crystallization is difficult, and the spray layer and the demister are blocked, etc.; when the supply amount of the high-efficiency desulfurization agent is insufficient, the desulfurization efficiency cannot reach the expected effect, and the significance of the double slurry supply high-efficiency desulfurization is lost. SUMMARY

[0004] Therefore, the present application aims to provide a desulfurization double slurry supply system automatic control method and device to solve the above problems existing in the manual adjustment of the desulfurization double slurry supply system.

[0005] In order to solve the above technical problems, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a desulfurization double slurry supply system automatic control method, which includes the following steps:

[0007] Set the expected SO2 concentration of the clean flue gas and the pH value of the desulfurization tower slurry as the first expected parameter set value and the second expected parameter set value respectively;

[0008] Set the output port flow of the high-efficiency desulfurization agent slurry supply equipment in the desulfurization double slurry supply system to track the first expected parameter set value, and set the output port flow of the limestone slurry supply equipment in the desulfurization double slurry supply system to track the second expected parameter set value;

[0009] PID control strategy is adopted to control the flow of two output ports of the desulfurization double slurry supply system to meet the requirements of corresponding expected parameter set values, and in the control process, the high-efficiency desulfurizer slurry supply equipment realizes automatic slurry preparation and automatic slurry supply operation based on the setting of equipment protection set values.

[0010] Further, when the high-efficiency desulfurizer slurry supply equipment realizes automatic slurry preparation, the setting of the equipment protection set values includes the following aspects:

[0011] The high-efficiency desulfurizer slurry pump control interlock protection trip condition, the high-efficiency desulfurizer slurry pump control interlock allowed start condition, the high-efficiency desulfurizer slurry pump control interlock automatic start condition, the high-efficiency desulfurizer dilution water regulating valve control interlock protection off condition, the high-efficiency desulfurizer dilution water regulating valve control interlock allowed open condition, and the high-efficiency desulfurizer dilution water regulating valve control interlock automatic open condition.

[0012] Further, the setting of the equipment protection set values specifically includes:

[0013] The high-efficiency desulfurizer slurry pump control interlock protection trip condition is set as the minimum limit value of the high-efficiency desulfurizer slurry tank liquid level or the maximum limit value of the dilution tank liquid level;

[0014] The high-efficiency desulfurizer slurry pump control interlock allowed start condition is set as the non-low limit value of the high-efficiency desulfurizer slurry tank liquid level and the minimum limit value of the dilution tank liquid level;

[0015] The high-efficiency desulfurizer slurry pump control interlock automatic start condition is set as the minimum limit value of the high-efficiency desulfurizer dilution tank liquid level and the operation of any one high-efficiency desulfurizer slurry pump;

[0016] The high-efficiency desulfurizer standby slurry pump control interlock automatic start condition is set as the trip of the running high-efficiency desulfurizer slurry pump;

[0017] The high-efficiency desulfurizer dilution water regulating valve control interlock protection off condition is set as the maximum limit value of the high-efficiency desulfurizer dilution tank liquid level;

[0018] The high-efficiency desulfurizer dilution water regulating valve control interlock allowed open condition is set as the non-low limit value of the high-efficiency desulfurizer dilution tank liquid level;

[0019] The high-efficiency desulfurizer dilution water regulating valve control interlock automatic open condition is set as the minimum limit value of the high-efficiency desulfurizer dilution tank liquid level and the operation of any one high-efficiency desulfurizer slurry pump.

[0020] Further, when the high-efficiency desulfurizer slurry supply equipment realizes automatic slurry preparation, the setting of the equipment protection set values includes the following aspects:

[0021] The high-efficiency desulfurizer slurry pump control interlock protection trip condition, the high-efficiency desulfurizer slurry pump control interlock automatic start condition, the high-efficiency desulfurizer flow regulating valve control interlock permission open condition and the high-efficiency desulfurizer flow regulating valve control interlock protection close condition.

[0022] Further, the device protection setting value is set, and specifically includes:

[0023] The high-efficiency desulfurizer dilution tank liquid level minimum limit value or the high-efficiency desulfurizer flow regulating valve close is set as the high-efficiency desulfurizer slurry pump control interlock protection trip condition;

[0024] The high-efficiency desulfurizer dilution tank liquid level non-low limit value and the high-efficiency desulfurizer flow regulating valve open are set as the high-efficiency desulfurizer slurry pump control interlock automatic start condition;

[0025] The high-efficiency desulfurizer slurry pump is set to trip, and the standby high-efficiency desulfurizer slurry pump is started by interlock, as the high-efficiency desulfurizer standby slurry pump control interlock automatic start condition;

[0026] The high-efficiency desulfurizer slurry supply port corresponding to any one slurry circulating pump running is set as the high-efficiency desulfurizer flow regulating valve control interlock permission open condition;

[0027] The high-efficiency desulfurizer slurry supply port corresponding to all slurry circulating pumps stopping is set as the high-efficiency desulfurizer flow regulating valve control interlock protection close condition.

[0028] Further, the desulfurization double slurry supply system is automatically controlled by a distributed control system, and the distributed control system is provided with an automatic slurry supply control input and removal button.

[0029] Further, when the distributed control system is automatically controlled, the control interlock automatic start of different original liquid pumps or slurry pumps is respectively provided with a priority selection button of the corresponding pump.

[0030] In the second aspect, the application provides a desulfurization double slurry supply system automatic control system, including:

[0031] An expected parameter setting unit is used to set the expected net flue gas SO2 concentration and the desulfurization tower slurry pH value as the first expected parameter setting value and the second expected parameter setting value, respectively.

[0032] An expected control setting unit is used to set the output port flow of the high-efficiency desulfurizer slurry supply device in the desulfurization double slurry supply system to track the first expected parameter setting value, and the output port flow of the limestone slurry supply device in the desulfurization double slurry supply system to track the second expected parameter setting value.

[0033] The automatic control unit is used for controlling the flow of two output ports of the desulfurization double slurry supply system by using a PID control strategy to meet the requirements of corresponding expected parameter set values, and in the control process, the high-efficiency desulfurizer slurry supply equipment realizes automatic slurry preparation and automatic slurry supply operation based on the setting of the equipment protection set value.

[0034] In a third aspect, the present application provides a desulfurization double slurry supply system automatic control device, which comprises a processor and a memory:

[0035] The memory is used for storing a computer program and sending instructions of the computer program to the processor.

[0036] The processor executes a desulfurization double slurry supply system automatic control method according to the instructions of the computer program.

[0037] In a fourth aspect, the present application provides a computer storage medium, which stores a computer program, and the computer program is executed by a processor to realize a desulfurization double slurry supply system automatic control method according to the first aspect.

[0038] In summary, the present application provides a desulfurization double slurry supply system automatic control method and system, which tracks the SO2 concentration of the clean flue gas by setting the output port flow of the high-efficiency desulfurizer slurry supply equipment in the desulfurization double slurry supply system, and tracks the pH value of the desulfurization tower slurry by setting the output port flow of the limestone slurry supply equipment in the desulfurization double slurry supply system; the present application automatically controls the SO2 concentration of the clean flue gas by using the high-efficiency desulfurization performance of the high-efficiency desulfurizer, and automatically controls the pH value of the desulfurization tower slurry by using the pH value buffering characteristics of the limestone desulfurizer, thereby solving the disadvantage that a single slurry supply mode cannot simultaneously complete the coordinated control of two parameters, and finally realizing the accurate control of the two important parameters of the desulfurization system. Meanwhile, the PID control strategy is used to realize the automation of the slurry preparation and slurry supply process, and the original liquid pump and the slurry supply pump do not need to be manually started and stopped in the slurry preparation and slurry supply process. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0040] Figure 1 A flowchart of a desulfurization double slurry supply system automatic control method provided by the present application is shown in the figure.

[0041] Figure 2 A PID control strategy control schematic diagram provided by the present application is shown in the figure.

[0042] Figure 3 The process schematic diagram of the existing limestone-gypsum wet desulfurization process device provided for the embodiment of the present application is shown in the figure.

[0043] Figure 4 The process schematic diagram of the desulfurization double slurry supply system process device provided for the embodiment of the present application is shown in the figure.

[0044] In the figure: 1, desulfurization tower, 2, atomizing nozzle, 3, demister, 4, agitator at the lower part of the desulfurization tower, 5, slurry circulating pump, 6, gypsum discharge pump, 7, oxidizing air system, 8-1, limestone slurry tank, 9-1, limestone slurry tank agitator, 10-1, limestone slurry supply pump, 11-1, limestone slurry regulating valve, 12, limestone powder bin, 13-1, dilution water regulating valve;

[0045] 14, high-efficiency desulfurization agent stock solution tank, 15, high-efficiency desulfurization agent stock solution pump, 8-2, high-efficiency desulfurization agent dilution tank, 9-2, high-efficiency desulfurization agent slurry tank agitator, 10-2, high-efficiency desulfurization agent slurry supply pump, 11-2, high-efficiency desulfurization agent flow regulating valve, 13-2, high-efficiency desulfurization agent dilution water regulating valve. DETAILED DESCRIPTION

[0046] To make the objectives, characteristics, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0047] Please refer to Figure 1 The desulfurization double slurry supply system automatic control method provided by the embodiment of the present application comprises the following steps:

[0048] S1: set the expected net flue gas SO2 concentration and the desulfurization tower slurry pH value as the first expected parameter set value and the second expected parameter set value, respectively;

[0049] S2: set the output port flow of the high-efficiency desulfurization agent slurry supply equipment in the desulfurization double slurry supply system to track the first expected parameter set value, and set the output port flow of the limestone slurry supply equipment in the desulfurization double slurry supply system to track the second expected parameter set value;

[0050] S3: adopt a PID control strategy to control the two output port flows of the desulfurization double slurry supply system to meet the requirements of the corresponding expected parameter set values, and in the control process, the high-efficiency desulfurization agent slurry supply equipment realizes automatic slurry preparation and automatic slurry supply operation based on the setting of the equipment protection set value.

[0051] For example,Figure 2 As shown, the principle of the PID control strategy is as follows: by comparing the deviations between the actual values ​​and the expected values ​​(actual net flue gas SO2 concentration and expected net flue gas SO2 concentration, actual desulfurization tower slurry pH value and expected desulfurization tower slurry pH value), the positive and negative deviations and their magnitudes are fed back to the flow regulator in the form of the required adjustment of the opening degree of the flow regulating valve, thereby controlling the change in the opening degree of the flow regulating valve and ultimately realizing the automatic control of the dual slurry supply system.

[0052] This invention utilizes the high efficiency of the desulfurizing agent to automatically control the SO2 concentration in the flue gas (parameter 1) and utilizes the pH buffering characteristics of the limestone desulfurizing agent to automatically control the pH value of the desulfurization tower slurry (parameter 2). This solves the drawback that a single slurry supply method cannot simultaneously complete the coordinated control of the two parameters, and ultimately achieves precise control of the two important parameters of the desulfurization system.

[0053] To further illustrate the features of the automatic control method for the desulfurization dual slurry supply system provided in this embodiment, the existing limestone-gypsum wet desulfurization process device and desulfurization dual slurry supply device are introduced below.

[0054] 1. Limestone-gypsum wet desulfurization process unit

[0055] A schematic diagram of the existing limestone-gypsum wet desulfurization process is shown below. Figure 3 As shown, the main components include a desulfurization tower 1, an atomizing nozzle 2 and a demister 3 at the top of the desulfurization tower, an agitator 4 at the bottom of the desulfurization tower, a slurry circulation pump 5, a gypsum discharge pump 6, an oxidation air system 7, a limestone slurry tank 8-1, a limestone slurry tank agitator 9-1, a limestone slurry supply pump 10-1, a limestone slurry regulating valve 11-1, a limestone powder silo 12, a dilution water regulating valve 13-1, as well as equipment such as a limestone slurry densitometer, a limestone slurry flow meter, an absorption tower slurry densitometer, an absorption tower slurry pH meter, and online monitoring instruments for pollutants (SO2) in the clean flue gas.

[0056] In the above structure, the original flue gas containing a high concentration of SO2 enters from the lower part of the desulfurization tower 1 and is discharged from the top; the slurry in the desulfurization tower is extracted from the bottom of the desulfurization tower by multiple slurry circulating pumps 5, sprayed from the top through multiple layers of atomizing nozzles 2, and contacted and chemically absorbed with the original flue gas entering the desulfurization tower, thereby removing SO2 in the flue gas; the slurry in the desulfurization tower contains a certain concentration of CaCO3, which is mixed with dilute water in the limestone powder bin 12 and made into a slurry of a certain concentration in the limestone slurry tank 8-1, supplied to the desulfurization tower 1 by the limestone slurry pump 10-1, and the amount of slurry entering the desulfurization tower is adjusted by the flow regulating valve 11-1 (limestone slurry pump frequency converter), which simultaneously serves to control the concentration of pollutants (SO2) in the clean flue gas and adjust the pH value of the slurry in the desulfurization tower; the oxidation air system 7 includes an oxidation air fan, an oxidation air pipe and other equipment, and the oxidation air outlet is located below the desulfurization tower and below the slurry surface of the desulfurization tower, which is used to forcibly oxidize the calcium sulfite (CaSO3) generated after the reaction of CaCO3 and SO2 into gypsum (CaSO4); the gypsum discharge pump 6 is used to transport the slurry in the desulfurization tower to the gypsum dewatering system to reduce the gypsum content in the desulfurization tower.

[0057] For the limestone slurry preparation method of the single limestone desulfurization process, the limestone slurry preparation method of the single limestone desulfurization process is completely completed manually, and the limestone slurry preparation method is also manually started to start the slurry pump, and then the slurry flow is adjusted. Although the slurry flow adjustment method can realize a certain automatic control method, the opening of the limestone slurry regulating valve 11-1 cannot simultaneously ensure that the SO2 content of the clean flue gas and the pH value of the slurry in the desulfurization tower are within the expected range, and the response time is also very slow, so it is easy to have problems of losing one to gain the other, thereby causing the irrationality of the control method.

[0058] 2. Desulfurization double slurry supply system

[0059] When the removal efficiency of SO2 is improved, a process method (desulfurization double slurry process) of adding a set of high-efficiency desulfurizing agent (strong alkali stock solution) slurry supply equipment to the above structure is used. This process method effectively combines the respective advantages and disadvantages of the single limestone desulfurization process, which has limited desulfurization capacity, the single strong alkali desulfurization process, which has high operating cost and is not conducive to gypsum formation, and can ensure that the SO2 in the clean flue gas meets the emission standard while controlling the pH value of the slurry in the desulfurization tower within a reasonable range. The process flow diagram of the process device is as follows Figure 4The main equipment of the dual slurry supply desulfurization process includes: a high-efficiency desulfurizer stock solution tank 14, high-efficiency desulfurizer stock solution pumps 15 (generally two, one in operation and one in standby), a high-efficiency desulfurizer dilution tank 8-2, a high-efficiency desulfurizer slurry tank agitator 9-2, a high-efficiency desulfurizer dilution water regulating valve 13-2, high-efficiency desulfurizer slurry supply pumps 10-2 (generally two, one in operation and one in standby), a high-efficiency desulfurizer flow regulating valve 11-2, and a high-efficiency desulfurizer stock solution flow meter, a high-efficiency desulfurizer dilution water flow meter, a high-efficiency desulfurizer slurry supply flow meter, etc. Among them, the high-efficiency desulfurizer stock solution is delivered by the stock solution pump 15 to the dilution tank 8-2 and diluted with water to the required proportion, and the diluted high-efficiency desulfurizer is sent by the high-efficiency desulfurizer slurry supply pump 10-2 to the inlet of the slurry circulating pump 5 of the desulfurization tower, and directly sprayed into the desulfurization tower 1 through the atomizing nozzle 2, realizing the pH value partitioning in time and space of the upper and lower parts of the desulfurization tower, that is, the upper part of the desulfurization tower is a high-pH value zone where strong alkali exists, and the lower part is a low-pH value zone where the strong alkali has completed the desulfurization reaction, finally realizing the high-efficiency desulfurization mode of dual desulfurizers. The amount of high-efficiency desulfurizer is realized by controlling the flow regulating valve 11-2 (or the high-efficiency desulfurizer slurry supply pump frequency converter).

[0060] Although the dual slurry supply desulfurization system has higher desulfurization efficiency, the required slurry supply amount of the two slurry supply systems is completely judged and manually adjusted by artificial, which is laborious, including the slurry preparation and supply operation of the limestone slurry and the high-efficiency desulfurizer two systems, the coordinated control of the desulfurization tower slurry pH value and the SO2 content of the clean flue gas, etc. If the operation of the two slurry supply systems is not timely or the control is not proper, the following situations may occur: when the high-efficiency desulfurizer is excessive, the desulfurization tower slurry pH value is artificially high, gypsum crystallization is difficult, and the spray layer and demister are blocked, etc.; when the supply amount of the high-efficiency desulfurizer is insufficient, the desulfurization efficiency does not reach the expected effect, and the significance of the dual slurry supply high-efficiency desulfurization is lost.

[0061] It can be seen that the above two schemes are difficult to coordinate the control of the desulfurization tower slurry pH value and the SO2 content of the clean flue gas.

[0062] The automatic control method provided by the embodiment utilizes the PID control strategy (proportional, integral, and differential control) to realize the automatic preparation of the high-efficiency desulfurizer slurry and the automatic slurry supply operation of the dual desulfurizers to the desulfurization tower in the dual slurry supply desulfurization system under the control requirements of the system equipment protection setting value, the expected system parameter setting value, etc. Among them, the PID control strategy can be executed by the distributed control system DCS.

[0063] The method is based on the high pH value and high desulfurization efficiency of the high-sulfur desulfurizing agent in the double slurry supply system, in order to fully exert the high-efficiency desulfurization performance and avoid the influence on the gypsum formation reaction, the slurry is directly sprayed into the spray layer of the desulfurization tower from the inlet of the slurry circulating pump, and the desulfurization reaction is completed at the upper part of the desulfurization tower; the pH value of the limestone slurry is low, and the dissolution speed is slow, which can be improved in the acidic environment of the desulfurization tower slurry, so the limestone slurry is directly introduced into the desulfurization tower slurry pool from the wall of the desulfurization tower, which is beneficial to buffer the pH value of the slurry of the absorption tower and reduce the corrosion risk of the desulfurization tower.

[0064] In an embodiment of the present application, the automatic slurry preparation operation of the high-efficiency desulfurizing agent slurry supply system is realized by setting the high-efficiency desulfurizing agent stock solution pump control interlocking protection tripping condition, the high-efficiency desulfurizing agent stock solution pump control interlocking permission starting condition, the high-efficiency desulfurizing agent stock solution pump control interlocking automatic starting condition, the high-efficiency desulfurizing agent dilution water regulating valve control interlocking protection closing condition, the high-efficiency desulfurizing agent dilution water regulating valve control interlocking permission opening condition, and the high-efficiency desulfurizing agent dilution water regulating valve control interlocking automatic opening condition.

[0065] The high-efficiency desulfurizing agent stock solution pump control interlocking protection tripping condition is that the liquid level of the high-efficiency desulfurizing agent stock solution tank is lower than the preset liquid level A or the liquid level of the dilution tank is higher than the preset liquid level B.

[0066] The high-efficiency desulfurizing agent stock solution pump control interlocking permission starting condition is that the liquid level of the high-efficiency desulfurizing agent stock solution tank is higher than the preset liquid level A, and the liquid level of the high-efficiency desulfurizing agent dilution tank is lower than the preset liquid level C.

[0067] The high-efficiency desulfurizing agent stock solution pump control interlocking automatic starting condition is that the automatic is put into operation, the liquid level of the high-efficiency desulfurizing agent dilution tank is lower than the preset liquid level D, and any one of the high-efficiency desulfurizing agent slurry pumps is running; the automatic is put into operation, the high-efficiency desulfurizing agent stock solution pump is tripped, and the standby high-efficiency desulfurizing agent stock solution pump is started.

[0068] The high-efficiency desulfurizing agent dilution water regulating valve control interlocking protection closing condition is that the liquid level of the high-efficiency desulfurizing agent dilution tank is higher than the preset liquid level B.

[0069] The high-efficiency desulfurizing agent dilution water regulating valve control interlocking permission opening condition is that the liquid level of the high-efficiency desulfurizing agent dilution tank is lower than the preset liquid level C.

[0070] The high-efficiency desulfurizing agent dilution water regulating valve control interlocking automatic opening condition is that the automatic is put into operation, the liquid level of the high-efficiency desulfurizing agent dilution tank is lower than the preset liquid level D, and any one of the high-efficiency desulfurizing agent stock solution pumps is running.

[0071] In one embodiment of the present application, by setting the high-efficiency desulfurizer slurry pump control interlock protection trip condition, the high-efficiency desulfurizer slurry pump control interlock automatic start condition, the high-efficiency desulfurizer flow regulating valve control interlock open condition, the high-efficiency desulfurizer flow regulating valve control interlock protection close condition, and using the PID control strategy, the automatic tracking of the preset value of the SO2 concentration of the clean flue gas and the automatic adjustment of the limestone slurry flow regulating valve opening (or the limestone slurry pump frequency converter frequency) to complete the automatic tracking of the preset value of the desulfurization tower slurry pH value are achieved. The PID control strategy is associated with the automatic slurry supply control input and removal buttons set in the DCS, and the one-key automatic slurry supply control of the dual slurry supply system is ultimately achieved.

[0072] The high-efficiency desulfurizer slurry pump control interlock protection trip condition is that the high-efficiency desulfurizer dilution tank liquid level is lower than the preset liquid level E or the high-efficiency desulfurizer flow regulating valve is closed.

[0073] The high-efficiency desulfurizer slurry pump control interlock automatic start condition is that the automatic is input, the high-efficiency desulfurizer dilution tank liquid level is higher than the preset liquid level E, and the high-efficiency desulfurizer flow regulating valve is open; the automatic is input, and the running slurry pump trips, and the standby slurry pump is started.

[0074] The high-efficiency desulfurizer flow regulating valve control interlock open condition is that the high-efficiency desulfurizer slurry port corresponds to any one of the slurry circulating pumps running.

[0075] The high-efficiency desulfurizer flow regulating valve control interlock protection close condition is that the high-efficiency desulfurizer slurry port corresponds to all the slurry circulating pumps stopping.

[0076] It should be noted that the letters representing the values of the above preset liquid levels A to E can be the same or different numbers.

[0077] In addition, in order to achieve convenient control, the input and removal buttons of the automatic slurry supply control are set in the DCS. When the dual slurry supply system needs to be controlled for desulfurization, the high-efficiency desulfurizer flow regulating valve is manually opened, and the automatic slurry supply control button is clicked, and the automatic slurry preparation of the high-efficiency desulfurizer and the automatic slurry supply of the dual desulfurizer mode are entered.

[0078] In order to meet the needs of the periodic switching of different original liquid pumps or slurry pumps in the automatic control state, the priority selection buttons of the corresponding pumps are set for the control interlock automatic start of different original liquid pumps or slurry pumps.

[0079] When the control value of the SO2 concentration of the clean flue gas or the slurry pH value of the desulfurization tower needs to be adjusted, the preset value of the automatic tracking of the SO2 concentration of the clean flue gas and the slurry pH value of the desulfurization tower can be adjusted.

[0080] The automatic pulp preparation and double desulfurizer automatic pulp supply mode of the high-efficiency desulfurizer proposed in the embodiment realizes the automation of the pulp preparation and supply process, and the original liquid pump and the pulp supply pump do not need to be started and stopped manually during the pulp preparation and supply process. Through automatic judgment of whether one of the original liquid pumps or the pulp supply pump trips during operation, the start and stop of the standby pump are determined, thereby avoiding the contradictory problem that two original liquid pumps or pulp supply pumps are started simultaneously due to mutual default as standby when starting pulp preparation or supply. The process is simple and has strong operability, and the amount of manual operation is greatly reduced.

[0081] The height of the high-efficiency desulfurizer original liquid tank and the dilution tank is 6 meters, the preset value of the SO2 concentration of the net flue gas is 30 mg / m3, and the preset value of the desulfurizing tower slurry pH is 5.5. The specific implementation of the method is as follows: 3

[0082] (I) High-efficiency desulfurizer automatic pulp preparation

[0083] The high-efficiency desulfurizer original liquid pump control interlocking protection trip condition is set as: the high-efficiency desulfurizer original liquid tank liquid level is lower than 1 meter or the dilution tank liquid level is higher than 5.5 meters.

[0084] The high-efficiency desulfurizer original liquid pump control interlocking allowed start condition is set as: the high-efficiency desulfurizer original liquid tank liquid level is higher than 1 meter, and the dilution tank liquid level is lower than 5 meters.

[0085] The high-efficiency desulfurizer original liquid pump control interlocking automatic start condition is set as: put into automatic, the high-efficiency desulfurizer dilution tank liquid level is lower than 3 meters, and any one of the high-efficiency desulfurizer pulp supply pumps is running; put into automatic, the high-efficiency desulfurizer original liquid pump trips, and the standby high-efficiency desulfurizer original liquid pump is started.

[0086] The high-efficiency desulfurizer dilution water regulating valve control interlocking protection off condition is set as: the high-efficiency desulfurizer dilution tank liquid level is higher than 5.5 meters.

[0087] The high-efficiency desulfurizer dilution water regulating valve control interlocking allowed open condition is set as: the high-efficiency desulfurizer dilution tank liquid level is lower than 5 meters.

[0088] The high-efficiency desulfurizer dilution water regulating valve control interlocking automatic open condition is set as: put into automatic, the high-efficiency desulfurizer dilution tank liquid level is lower than 3 meters, and any one of the high-efficiency desulfurizer original liquid pumps is running.

[0089] (II) High-efficiency desulfurizer automatic pulp supply

[0090] The high-efficiency desulfurizer pulp supply pump control interlocking protection trip condition is set as: the high-efficiency desulfurizer dilution tank liquid level is lower than 1 meter or the high-efficiency desulfurizer flow regulating valve is closed.

[0091] ​The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0092] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0093] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0094] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips. 3 The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0095] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0096] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0097] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0098] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0099] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0100] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0101] The automatic starting condition of the high-efficiency desulfurizer slurry pump control interlock is set as: automatic input, the liquid level of the high-efficiency desulfurizer dilution tank is higher than 1 meter, and the high-efficiency desulfurizer flow regulating valve is opened; automatic input, the standby high-efficiency desulfurizer slurry pump is started in interlock when the running high-efficiency desulfurizer slurry pump trips.

[0102] The processor executes the instructions of the computer program to perform the automatic control method of the dual slurry supply system for desulfurization according to the foregoing embodiment.

[0103] In another embodiment of the present application, a computer storage medium is provided, and a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the automatic control method of the dual slurry supply system for desulfurization according to the foregoing embodiment.

[0104] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described herein.

[0105] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for automatically controlling a dual slurry supply system for desulfurization, characterized by, The method comprises the following steps: setting expected net flue gas SO2 concentration and desulfurization tower slurry pH value as first and second expected parameter set values respectively; setting output port flow of high-efficiency desulfurizer slurry supply equipment in the desulfurization double slurry supply system to track the first expected parameter set value, and setting output port flow of limestone slurry supply equipment in the desulfurization double slurry supply system to track the second expected parameter set value; controlling the two output port flows of the desulfurization double slurry supply system by using a PID control strategy to meet the requirements of the corresponding expected parameter set values, and in the control process, the high-efficiency desulfurizer slurry supply equipment realizes automatic slurry preparation and automatic slurry supply operation based on the setting of equipment protection set values.

2. The automatic control method of a dual slurry supply desulfurization system according to claim 1, characterized in that, When the high-efficiency desulfurizer slurry supply equipment realizes automatic slurry preparation, the setting of the equipment protection set values comprises the following aspects: high-efficiency desulfurizer original solution pump control interlock protection tripping condition, high-efficiency desulfurizer original solution pump control interlock allowed start condition, high-efficiency desulfurizer original solution pump control interlock automatic start condition, high-efficiency desulfurizer dilution water regulating valve control interlock protection closing condition, high-efficiency desulfurizer dilution water regulating valve control interlock allowed opening condition, and high-efficiency desulfurizer dilution water regulating valve control interlock automatic opening condition.

3. The automatic control method of a dual slurry supply desulfurization system according to claim 2, characterized in that, The setting of the equipment protection set values specifically comprises: setting a high-efficiency desulfurizer original solution tank liquid level minimum limit value or a dilution tank liquid level maximum limit value as the high-efficiency desulfurizer original solution pump control interlock protection tripping condition; setting a high-efficiency desulfurizer original solution tank liquid level non-low limit value and a dilution tank liquid level minimum limit value as the high-efficiency desulfurizer original solution pump control interlock allowed start condition; setting a high-efficiency desulfurizer dilution tank liquid level minimum limit value and any one high-efficiency desulfurizer slurry pump running as the high-efficiency desulfurizer original solution pump control interlock automatic start condition; setting that if a high-efficiency desulfurizer original solution pump trips, a standby high-efficiency desulfurizer original solution pump is started as the high-efficiency desulfurizer standby original solution pump control interlock automatic start condition; setting a high-efficiency desulfurizer dilution tank liquid level maximum limit value as the high-efficiency desulfurizer dilution water regulating valve control interlock protection closing condition; setting a high-efficiency desulfurizer dilution tank liquid level non-low limit value as the high-efficiency desulfurizer dilution water regulating valve control interlock allowed opening condition; setting a high-efficiency desulfurizer dilution tank liquid level minimum limit value and any one high-efficiency desulfurizer original solution pump running as the high-efficiency desulfurizer dilution water regulating valve control interlock automatic opening condition.

4. The automatic control method of a dual slurry supply desulfurization system according to claim 1, characterized by, When the high-efficiency desulfurizer slurry supply equipment realizes automatic slurry supply, the setting of the equipment protection set values comprises the following aspects: high-efficiency desulfurizer slurry pump control interlock protection tripping condition, high-efficiency desulfurizer slurry pump control interlock automatic start condition, high-efficiency desulfurizer flow regulating valve control interlock allowed opening condition, and high-efficiency desulfurizer flow regulating valve control interlock protection closing condition.

5. The automatic control method of a dual slurry supply desulfurization system according to claim 4, characterized in that, The setting of the equipment protection set values specifically comprises: setting a high-efficiency desulfurizer dilution tank liquid level minimum limit value or a high-efficiency desulfurizer flow regulating valve closing as the high-efficiency desulfurizer slurry pump control interlock protection tripping condition; setting a high-efficiency desulfurizer dilution tank liquid level non-low limit value and a high-efficiency desulfurizer flow regulating valve opening as the high-efficiency desulfurizer slurry pump control interlock automatic start condition; Setting the running efficient desulfurizer slurry pump trip, the standby efficient desulfurizer slurry pump is started as the control interlock automatic starting condition of the efficient desulfurizer standby slurry pump; Setting the efficient desulfurizer slurry port corresponding to any one slurry circulating pump running as the efficient desulfurizer flow regulating valve control interlock allowed open condition; Setting the efficient desulfurizer slurry port corresponding to all slurry circulating pumps stop as the efficient desulfurizer flow regulating valve control interlock protection off condition.

6. The automatic control method of a dual slurry supply desulfurization system according to claim 1, characterized by, The desulfurization double slurry supply system is automatically controlled by a distributed control system, and the distributed control system is provided with automatic slurry supply control input and removal buttons.

7. The automatic control method of a dual slurry supply desulfurization system according to claim 6, characterized by, When the distributed control system is automatically controlled, the control interlock automatic starting of different original liquid pumps or slurry pumps is respectively provided with a priority selection button of the corresponding pump.

8. A desulfurization double slurry supply system automatic control system, characterized by, It comprises: An expected parameter setting unit is configured to set expected net flue gas SO2 concentration and desulfurization tower slurry pH value as first and second expected parameter setting values, respectively; An expected control setting unit is configured to set the output port flow of the efficient desulfurizer slurry supply equipment in the desulfurization double slurry supply system to track the first expected parameter setting value, and the output port flow of the limestone slurry supply equipment in the desulfurization double slurry supply system to track the second expected parameter setting value; An automatic control unit is configured to use a PID control strategy to control the two output port flows of the desulfurization double slurry supply system to meet the requirements of the corresponding expected parameter setting values, and in the control process, the efficient desulfurizer slurry supply equipment is automatically grinded and supplied based on the setting of the equipment protection value.

9. A desulfurization dual slurry supply system automatic control device, characterized by, The device comprises a processor and a memory: The memory is used to store a computer program and send instructions of the computer program to the processor; The processor executes the instructions of the computer program to perform the automatic control method of the desulfurization double slurry supply system according to any one of claims 1-7.

10. A computer storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the automatic control method of the desulfurization double slurry supply system according to any one of claims 1-7.

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