Flue gas desulfurization system and method for thermal power generating unit

Abstract

The invention discloses a flue gas desulfurization system and method for a thermal power generating unit, and relates to the technical field of flue gas desulfurization, desulfurization simulation is performed on user conditions by adopting a plurality of to-be-divided marks, and consumption values, effect values and building values of different to-be-divided marks during desulfurization are obtained according to desulfurization simulation; then determining a target desulfurization method according to the relation that the target desulfurization method is in direct proportion to the effect value and is in inverse proportion to the consumption value and the set-up value, and performing desulfurization treatment by means of the target desulfurization method; therefore, the invention can provide a reasonable scheme for selecting an existing desulfurization construction method, can find a method most suitable for an enterprise by combining the cost and the effect, and is simple, effective and easy to use.

Description

Technical Field

[0001] The present invention belongs to the technical field of flue gas desulfurization, and specifically relates to a flue gas desulfurization system and method for thermal power units. Background Art

[0002] A patent with the publication number CN111773905A discloses a flue gas desulfurization system and a flue gas desulfurization method. The top of the flue gas desulfurization device of the system is connected with a flue gas outlet, and the lower part is provided with a flue gas inlet. A spray desulfurization absorption chamber is arranged inside the flue gas desulfurization device; the bottom end of the flue gas desulfurization device is provided with a subsequent pipeline of the desulfurization device, and one side of the subsequent pipeline of the desulfurization device is connected with a threaded connecting pipe. By using the desulfurization device of the present invention for flue gas desulfurization, it can effectively prevent the pipeline from being blocked by precipitates, improve the desulfurization effect and the recycling rate of wastewater, and reduce the maintenance cost.

[0003] However, for the flue gas desulfurization method, how to select the most suitable method for an enterprise from several desulfurization methods is a difficult problem. Based on this, a solution is provided. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art;

[0005] To this end, the present invention proposes a flue gas desulfurization method for thermal power units, which specifically includes the following steps:

[0006] Use several to-be-classified objects to perform desulfurization simulation on the user situation, and obtain the consumption value, effectiveness value, and construction value of different to-be-classified objects during desulfurization according to the desulfurization simulation; the to-be-classified objects here represent several existing desulfurization methods; the consumption value is used to represent the cost consumed for one desulfurization, and the construction value is used to represent the cost consumed for building the corresponding to-be-classified object; the effectiveness value is the detected desulfurization efficiency;

[0007] Then, determine a target desulfurization method according to the relationship that is proportional to the effectiveness value and inversely proportional to the consumption value and the construction value, and perform desulfurization treatment by means of the target desulfurization method.

[0008] Further, the to-be-classified objects are obtained in the following manner,

[0009] Obtain several existing desulfurization methods, delete the desulfurization methods that cannot be implemented at the technical level of the corresponding target object, mark the remaining ones as to-be-classified objects, and then perform simulation on the to-be-classified objects.

[0010] Further, the specific manner of performing simulation according to the to-be-classified objects is:

[0011] Reduce the to-be-classified objects by a set ratio, and apply them to the corresponding target object one by one in a miniaturized manner to perform desulfurization treatment on the flue gas of the thermal power unit and run for a set duration.

[0012] Further, the method for selecting the to-be-classified targets according to the consumption value, effectiveness value, and construction value is as follows:

[0013] Mark all the to-be-classified targets as Di, where i = 1,..., n; the corresponding consumption value, effectiveness value, and construction value are marked as Hi, Ci, and Zi in sequence, where i = 1,..., n, and Di, Hi, Ci, and Zi are in one-to-one correspondence; here, n is a positive integer, indicating that there are n to-be-classified targets;

[0014] Remove the dimensions of Hi, Ci, and Zi, and then calculate the evaluation value Pi of each to-be-classified target using the formula. The specific formula is:

[0015] Pi = (Ci - Q) / (K1 * Hi + K2 * Zi);

[0016] In the formula, Q is the target value of the desulfurization rate required for the target object pre-reviewed by the administrator; K1 and K2 are the weight values corresponding to the consumption value and construction value, which are preset by the administrator according to the enterprise requirements;

[0017] After calculating the evaluation value Pi, sort them in descending order of Pi, and mark the top three to-be-classified targets as the target desulfurization methods, recommend them to the user for selection, and determine the final target desulfurization method after selection.

[0018] Further, when obtaining the effectiveness value, it needs to be repeated several times to obtain several effectiveness values, and the final effectiveness value is determined according to the data distribution of the effectiveness values.

[0019] Further, the specific method for determining the final effectiveness value data is as follows:

[0020] Mark several effectiveness values as Tj, where j = 1,..., m;

[0021] Automatically calculate the mean U of Tj, screen out the Tj values that satisfy |Tj - U| > U1, mark the value obtained by dividing the number of such values by m as the deviation ratio. When the deviation ratio exceeds B1, it indicates that the data is chaotic. At this time, repeat the simulation for this to-be-classified target. If the deviation ratio still exceeds B1 for the second time, mark the minimum value among the Tj values before screening as the effectiveness value of the corresponding to-be-classified target;

[0022] If the deviation ratio does not exceed B1, at this time, mark the mean of the remaining Tj values after screening as the effectiveness value of the corresponding to-be-classified target;

[0023] Perform the same processing on all the other to-be-classified targets to obtain the effectiveness values of all the to-be-classified targets.

[0024] A flue gas desulfurization system for a thermal power unit, which uses the aforementioned desulfurization method to carry out flue gas desulfurization of the thermal power unit.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The present invention simulates desulfurization of user conditions by using several sub - targets to be divided, obtains the consumption value, effectiveness value and construction value of different sub - targets to be divided during desulfurization according to the desulfurization simulation; then determines a target desulfurization method according to the relationship that is directly proportional to the effectiveness value and inversely proportional to the consumption value and construction value, and performs desulfurization treatment by means of the target desulfurization method;

[0027] The present application can provide a reasonable scheme for selecting the existing desulfurization method, can find the most suitable method for the enterprise by comprehensively considering cost and effect. The present invention is simple and effective, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flowchart of the method of the present invention;

[0029] Figure 2 is a flowchart of the second embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0031] Please refer to Figure 1 - Figure 2 , the present application provides a flue gas desulfurization method for thermal power units;

[0032] As the first embodiment of the present application, the method specifically includes the following steps:

[0033] Step 1: Perform desulfurization simulation before flue gas desulfurization to determine a desulfurization method suitable for the target object according to the desulfurization simulation. The target object is the enterprise that needs to perform desulfurization. The specific desulfurization simulation process is as follows:

[0034] Obtain several existing desulfurization methods. Here, the desulfurization method is a desulfurization method in the prior art, specifically including common methods such as wet desulfurization, dry desulfurization, and semi - dry desulfurization. Wet desulfurization includes limestone - gypsum method, double - alkali method and ammonia method. Dry desulfurization includes spray drying method, in - furnace calcium injection with flue gas humidification at the tail process; semi - dry desulfurization includes flue gas circulating fluidized bed desulfurization process, humidified ash circulation desulfurization technology;

[0035] The administrator screens the desulfurization methods. The specific simulation method is to reduce the set ratio of the object to be sub - labeled and apply it to the corresponding target objects one by one in a miniaturized manner for desulfurization treatment of the flue gas of thermal power units and run for a set duration;

[0036] The reduced set ratio here is reduced proportionally according to the actual situation of the thermal power unit;

[0037] Collect all the simulation information when the object to be sub - labeled is applied to the target object. The simulation information includes consumption value, effectiveness value, and construction value. Here, the consumption value refers to the value of raw materials consumed when using the method corresponding to the object to be sub - labeled for treatment, that is, the cost amount that the enterprise needs to pay when using the method of the object to be sub - labeled. The effectiveness value refers to the purification efficiency during desulfurization treatment corresponding to the object to be sub - labeled, that is, the desulfurization rate after desulfurization treatment; the construction value refers to the cost paid when constructing the object to be sub - labeled;

[0038] Complete the simulation to obtain the consumption value, effectiveness value, and construction value of all objects to be sub - labeled;

[0039] Step 2: Substitute the consumption value, effectiveness value, and construction value obtained from the simulation into the adaptability model for analysis. The specific method is as follows:

[0040] First, mark all objects to be sub - labeled as Di, where i = 1,..., n; the corresponding consumption value, effectiveness value, and construction value are marked as Hi, Ci, and Zi respectively, where i = 1,..., n, and Di, Hi, Ci, and Zi are in one - to - one correspondence; here, n is a positive integer, indicating that there are n objects to be sub - labeled;

[0041] Remove the dimensions of Hi, Ci, and Zi, and then calculate the evaluation value Pi of each object to be sub - labeled using the formula. The specific formula is:

[0042] Pi=(Ci - Q) / (K1 * Hi+K2 * Zi);

[0043] In the above formula, Q is the target value of the desulfurization rate required for the target object pre - reviewed by the administrator. This value shall not be lower than the local specified standard value. If the administrator sets it lower than the standard value, it will be automatically adjusted to the local standard value; K1 and K2 are the weight values corresponding to the consumption value and construction value, which are preset by the administrator according to the enterprise's needs; generally, K1 is 0.61 and K2 is 0.39;

[0044] After calculating the evaluation value Pi, sort them in descending order of Pi, and mark the top three objects to be sub - labeled as the target desulfurization methods and recommend them to the user for selection. After selection, determine the final target desulfurization method;

[0045] Step 3: Operate according to the determined target desulfurization method;

[0046] Of course, as the second embodiment of the present application, this embodiment is implemented on the basis of the first embodiment. The difference is that when obtaining the effectiveness value in this embodiment, a reproduction process needs to be performed. The specific method of the reproduction process is as follows:

[0047] For any sub-target to be divided, during the simulation, instead of simulating once, several repeated simulations are performed while keeping the simulation environment unchanged each time, so as to obtain the effectiveness values of several simulations, which are separately marked as Tj, where j = 1,..., m, indicating that m simulations are performed, and m is a positive integer;

[0048] Automatically calculate the mean value U of Tj. Then, select the Tj values that satisfy |Tj - U| > U1. Mark the value obtained by dividing the number of such values by m as the deviation ratio. When the deviation ratio exceeds B1, it indicates that the data is chaotic. At this time, repeat the simulation for this sub-target to be divided. If the deviation ratio still exceeds B1 for the second time, mark the minimum value among the Tj values before screening as the effectiveness value of the corresponding sub-target to be divided;

[0049] If the deviation ratio does not exceed B1, at this time, mark the mean value of the remaining Tj values after screening as the effectiveness value of the corresponding sub-target to be divided;

[0050] Perform the same processing for all the other sub-targets to be divided to obtain the effectiveness values of all sub-targets to be divided.

[0051] Of course, the present application is also used to provide a flue gas desulfurization system for thermal power units. This system uses the above desulfurization method to determine the sub-targets to be divided and thus perform desulfurization treatment on the flue gas of thermal power units.

[0052] The above embodiments are only used to illustrate the technical method of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A flue gas desulfurization method for a thermal power unit, characterized in that, The method specifically includes the following steps: Use several sub - targets to perform desulfurization simulation on the user situation. According to the desulfurization simulation, obtain the consumption value, effectiveness value, and construction value of different sub - targets during desulfurization. Here, the sub - targets represent several existing desulfurization methods; the consumption value is used to represent the cost consumed for one - time desulfurization, the construction value is used to represent the cost consumed for building the corresponding sub - target; the effectiveness value is the detected desulfurization efficiency. Then, determine a target desulfurization method according to the relationship that is proportional to the effectiveness value and inversely proportional to the consumption value and the construction value, and perform desulfurization treatment by means of the target desulfurization method.

2. The method for flue gas desulfurization of a thermal power unit according to claim 1, characterized in that, The sub - targets are obtained according to the following method: Obtain several existing desulfurization methods, delete the desulfurization methods that cannot be realized at the technical level of the corresponding target object, mark the remaining ones as sub - targets, and then perform simulation on the sub - targets.

3. A flue gas desulfurization method for a thermal power unit according to claim 1, wherein, The specific method for performing simulation according to the sub - targets is as follows: Reduce the sub - targets by a set ratio, and apply them to the corresponding target object one by one in a miniaturized manner to perform desulfurization treatment on the flue gas of the thermal power unit and run for a set duration.

4. A flue gas desulfurization method for a thermal power unit according to claim 1, characterized in that, The method for selecting sub - targets according to the consumption value, effectiveness value, and construction value is as follows: Mark all sub - targets as Di, where i = 1,..., n; mark the corresponding consumption value, effectiveness value, and construction value as Hi, Ci, and Zi in sequence, where i = 1,..., n, and Di, Hi, Ci, and Zi are in one - to - one correspondence; here, n is a positive integer, indicating that there are n sub - targets. Remove the dimensions of Hi, Ci, and Zi, and then use the formula to calculate the evaluation value Pi of each sub - target. The specific formula is: Pi=(Ci - Q) / (K1*Hi + K2*Zi); In the formula, Q is the target value of the desulfurization rate required for the target object pre - reviewed by the administrator; K1 and K2 are the weight values corresponding to the consumption value and the construction value, which are preset by the administrator according to the enterprise requirements; After calculating the evaluation value Pi, sort them in descending order of Pi, and mark the top three sub - targets as the target desulfurization methods and recommend them to the user for selection. After selection, determine the final target desulfurization method.

5. A method for desulfurizing flue gas of a thermal power unit according to claim 1, characterized in that When obtaining the effectiveness value, it is necessary to repeat it several times to obtain several effectiveness values, and determine the final effectiveness value according to the data distribution of the effectiveness values.

6. A method for flue gas desulfurization of a thermal power unit according to claim 5, characterized in that, The specific method for determining the final effectiveness value data is as follows: Mark several effectiveness values as Tj, where j = 1,..., m; Automatically calculate the mean U of Tj, screen out the Tj values that satisfy |Tj - U|>U1, mark the value obtained by dividing the number of such values by m as the deviation ratio. When the deviation ratio exceeds B1, it indicates that the data is chaotic. At this time, repeat the simulation for this sub - target. If the deviation ratio still exceeds B1 for the second time, mark the minimum value among the Tj values before screening as the effectiveness value of the corresponding sub - target; If the deviation ratio does not exceed B1, at this time, mark the mean value of the remaining Tj values after screening as the effectiveness value of the corresponding sub - target; Perform the same processing on all other sub - targets to obtain the effectiveness values of all sub - targets.

7. A flue gas desulfurization system for a thermal power unit, characterized in that, The system uses the method described in any one of claims 1-6 to carry out flue gas desulfurization for thermal power generation units.

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