CN111013374A - Method for configuring amount of multilayer spraying desulfurization slurry in wet desulfurization tower - Google Patents
Method for configuring amount of multilayer spraying desulfurization slurry in wet desulfurization tower Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The application provides a method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower, wherein the spraying amounts of the desulfurization slurry in spraying layers with different heights in the desulfurization tower are configured in unequal amounts; according to the method, the spraying amount of each spraying layer in the tower is matched with the falling dead time of the spraying layer in the flue gas, so that the utilization degree of an absorbent in the desulfurization slurry is improved, the molar ratio of calcium to sulfur and the liquid-gas ratio are reduced, and the desulfurization efficiency is improved; meanwhile, different spraying amounts cause different circulation flows and larger power difference of all the desulfurization slurry circulating pumps, the desulfurization slurry circulating pumps are switched on and off in an optimized sequence during load adjustment, and more power combination modes of desulfurization slurry circulating pump groups exist, so that the total power of all the desulfurization slurry circulating pumps is slowly, continuously and stably reduced or increased, the total power is more matched with the load change of a boiler, and the energy consumption loss of the desulfurization slurry circulating pumps is reduced.
Description
Technical Field
The invention relates to the technical field of wet flue gas desulfurization, in particular to a method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower.
Background
At present, the mainstream desulfurization technology adopted by domestic thermal power plants is desulfurization tower desulfurization adopting wet-process countercurrent multilayer spraying, the spraying amount of desulfurization slurry in each spraying layer is the same, but the spraying height of each spraying layer is different, so that the stagnation time of desulfurization slurry liquid drops sprayed by different spraying layers in the tower is different, the contact time of desulfurization slurry sprayed by different spraying layers and flue gas is different, the reaction degree of heat and mass transfer is different, and the utilization degree of an absorbent in the desulfurization slurry is also different.
The falling dead time of the desulfurization slurry sprayed from the lowest spraying layer is shortest, the contact process with the flue gas is insufficient, the utilization degree of the desulfurization slurry is the worst, and the required amount of the desulfurization slurry is the smallest; the longer the stagnation time of the desulfurization slurry sprayed out of the spraying layer positioned at a higher position is, the more sufficient the heat and mass transfer process with the flue gas is, the higher the utilization degree of the desulfurization slurry is, and more desulfurization slurry is needed to absorb more SO2. Therefore, the existing design of equal spraying amount of each spraying layer has the problem that the spraying amount of the desulfurization slurry of each spraying layer is not matched with the height of the spraying layer, so that the utilization degree of the absorbent in the desulfurization slurry is poor, and the desulfurization efficiency is low.
At present, each spraying layer of the wet-process multilayer spraying desulfurization tower is correspondingly communicated with one desulfurization slurry circulating pump, and the design flow of each desulfurization slurry circulating pump is the same. In the load adjustment, the number of the start-up desulfurization slurry circulating pumps is adjusted by the desulfurization system according to the amount of incoming flue gas to change the liquid-gas ratio, so that the requirement of load adjustment is met, and therefore, when the load of the boiler changes, each adjustment of the desulfurization system is to turn on or off one desulfurization slurry circulating pump, the adjustment is step-by-step and discontinuous, but the change of the load of the boiler is continuous, so that the energy consumption loss of the desulfurization slurry circulating pumps is caused.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a method for configuring amounts of multiple layers of spraying desulfurization slurry in a wet desulfurization tower, so as to overcome the problems of mismatch between the spraying amount of desulfurization slurry in each spraying layer in the existing desulfurization tower and the height of the spraying layer, and large energy consumption loss of a desulfurization slurry circulating pump during boiler load adjustment, and provide a configuration manner with unequal spraying amounts of desulfurization slurry in each spraying layer in the wet desulfurization tower, which is energy-saving and efficiency-improving, so as to improve desulfurization efficiency and reduce energy consumption loss of the desulfurization slurry circulating pump.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower is characterized in that the spraying amounts of the desulfurization slurry in spraying layers with different heights in the desulfurization tower are configured in unequal amounts;
the spraying amount of the desulfurization slurry in each spraying layer is G in sequence from low to high1、G2、…、Gm-1、GmWherein m is the mth spray layer from low to high, and m is 3, 4, 5, 6, 7, 8 or 9.
Preferably, when the desulfurization tower comprises 3 spraying layers in total, the spraying amount of the desulfurization slurry of each spraying layer is respectively as follows: 0.7G0-3≤G1≤0.85G0-3，0.9G0-3≤G2≤1.15G0-3，G0-3≤G3≤1.3G0-3Wherein G is0-3The single-layer spraying amount is the single-layer spraying amount when 3 spraying layers are totally included in the desulfurizing tower and each spraying layer is designed to be equal in spraying amount.
Preferably, when the desulfurization tower comprises 4 spraying layers in total, the spraying amount of the desulfurization slurry in each spraying layer is respectively as follows: 0.65G0-4≤G1≤0.8G0-4，0.8G0-4≤G2≤0.95G0-4，1.1G0-4≤G3≤1.35G0-4，G0-4≤G4≤1.2G0-4Wherein G is0-4The single-layer spraying amount is designed when 4 spraying layers are included in the desulfurization tower and the spraying layers adopt equal spraying amount.
Preferably, when the desulfurization tower comprises 5 spraying layers in total, the spraying amount of the desulfurization slurry in each spraying layer is respectively as follows: 0.6G0-5≤G1≤0.8G0-5，0.8G0-5≤G2≤0.95G0-5，0.95G0-5≤G3≤1.1G0-5，1.2G0-5≤G4≤1.4G0-5，G0-5≤G5≤1.3G0-5Wherein G is0-5The single-layer spraying amount is the single-layer spraying amount when the total 5 spraying layers are included in the desulfurizing tower and each spraying layer is designed to be equal in spraying amount.
Preferably, the spraying layer of each layer is communicated with a desulfurization slurry circulating pump so as to provide desulfurization slurry for nozzles in the spraying layer for spraying, and when the load of the boiler is reduced, the desulfurization slurry circulating pumps correspondingly communicated with the spraying layers are sequentially closed according to the sequence from low to high of the spraying layers;
when the load of the boiler is increased, the desulfurization slurry circulating pumps correspondingly communicated with the spraying layers are sequentially started according to the sequence from high to low of the spraying layers.
The application provides a method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower, wherein the spraying amounts of the desulfurization slurry in spraying layers with different heights in the desulfurization tower are configured in unequal amounts;
the spraying amount of the desulfurization slurry in each spraying layer is G in sequence from low to high1、G2、…、Gm-1、GmWherein m is the mth spray layer from low to high, and m is 3, 4, 5, 6, 7, 8 or 9;
in the application, the spraying amounts of the desulfurization slurry in the spraying layers with different heights in the desulfurization tower are configured in different amounts, so that the spraying amount of the desulfurization slurry in each spraying layer in the tower is matched with the falling dead time of the desulfurization slurry in flue gas, the utilization degree of an absorbent in the desulfurization slurry is improved, the calcium-sulfur molar ratio and the liquid-gas ratio are reduced, and the desulfurization efficiency is improved;
meanwhile, each spraying layer with different spraying amount is correspondingly communicated with each desulfurization slurry circulating pump, because the spraying amount of the desulfurization slurry of each spraying layer is equal to the outlet flow of each desulfurization slurry circulating pump, and because the spraying amount of the desulfurization slurry in each spraying layer adopts unequal amount configuration, the outlet flow of each desulfurization slurry circulating pump is different and the power difference is larger, compared with the prior desulfurization slurry circulating pump group with equal flow and basically equal power, during load adjustment, the desulfurization slurry circulating pump is switched on and off in an optimized sequence, more power combination modes of the desulfurization slurry circulating pump group exist, the step discontinuity of the load adjustment of the desulfurization system can be improved, so that the total power of all desulfurization slurry circulating pumps is slowly, continuously and smoothly reduced or increased, the method is more matched with the boiler load which is continuously and stably changed, and the energy consumption loss of the desulfurization slurry circulating pump is reduced.
Drawings
Fig. 1 is a schematic diagram of an operating principle of a configuration method of the amount of multi-layer spray desulfurization slurry in a wet desulfurization tower provided by the present application (the desulfurization tower in fig. 1 includes 4 spray layers in total).
In the figure: 1 desulfurizing tower, 2 spraying layers, 3 desulfurizing slurry circulating pumps and 4 nozzles.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate the features and advantages of the invention and not to limit the scope of the claims.
The application provides a method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower, wherein the spraying amounts of the desulfurization slurry in the spraying layers 2 with different heights in the desulfurization tower 1 are configured in unequal amounts;
the spraying amount of the desulfurization slurry of each spraying layer 2 is G in sequence from low to high according to the sequence of the spraying layers 21、G2、…、Gm-1、GmWherein m is the mth spray layer from low to high, and m is 3, 4, 5, 6, 7, 8 or 9.
In one embodiment of the present application, when a total of 3 spray layers 2 are included in the desulfurization tower 1, the spray amounts of the desulfurization slurry in each spray layer 2 are: 0.7G0-3≤G1≤0.85G0-3，0.9G0-3≤G2≤1.15G0-3，G0-3≤G3≤1.3G0-3Wherein G is0-3The single-layer spraying amount is designed when 3 spraying layers 2 are included in the desulfurization tower 1 and each spraying layer 2 is equal in spraying amount.
In one embodiment of the present application, when a total of 4 spray layers 2 are included in the desulfurization tower 1, the spray amounts of the desulfurization slurry in each spray layer 2 are: 0.65G0-4≤G1≤0.8G0-4，0.8G0-4≤G2≤0.95G0-4，1.1G0-4≤G3≤1.35G0-4，G0-4≤G4≤1.2G0-4Wherein G is0-4The single-layer spraying amount is designed when 4 spraying layers 2 are included in the desulfurization tower 1 and each spraying layer 2 is equal in spraying amount.
In one embodiment of the present application, when a total of 5 spray layers 2 are included in the desulfurization tower 1, the spray amount of the desulfurization slurry in each spray layer 2 is: 0.6G0-5≤G1≤0.8G0-5，0.8G0-5≤G2≤0.95G0-5，0.95G0-5≤G3≤1.1G0-5，1.2G0-5≤G4≤1.4G0-5，G0-5≤G5≤1.3G0-5Wherein G is0-5The single-layer spraying amount is designed when a total of 5 spraying layers 2 are included in the desulfurizing tower 1 and each spraying layer 2 is equal in spraying amount.
In one embodiment of the application, the spraying layer 2 of each layer is communicated with a desulfurization slurry circulating pump 3 so as to provide desulfurization slurry for spraying to the nozzles 4 in the spraying layer 2 by the desulfurization slurry circulating pump 3, and when the boiler load is reduced, the desulfurization slurry circulating pumps 3 correspondingly communicated with the spraying layers 2 are sequentially closed according to the sequence from low to high of the spraying layers 2;
when the load of the boiler is increased, the desulfurization slurry circulating pumps 3 correspondingly communicated with the spraying layers 2 are sequentially started according to the sequence from high to low of the spraying layers 2.
In order to further understand the present invention, the following will explain the configuration method of the multilayer spraying desulfurization slurry amount in the wet desulfurization tower provided by the present invention in detail with reference to the following examples, and the protection scope of the present invention is not limited by the following examples.
Example 1
A method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower is characterized in that the spraying amounts of the desulfurization slurry in spraying layers 2 with different heights in a desulfurization tower 1 are configured in unequal amounts;
the desulfurizing tower 1 comprises 3 layers of spraying layers 2 in total, and the spraying amount of the desulfurizing slurry of each spraying layer 2 is respectively as follows: g1＝0.75G0-3，G2＝1.15G0-3，G3＝1.05G0-3Wherein G is0-3The single-layer spraying amount is that when 3 layers of spraying layers 2 are included in the desulfurizing tower 1 and each spraying layer 2 adopts equal spraying amount design;
each spraying layer 2 is communicated with a desulfurization slurry circulating pump 3 so as to provide desulfurization slurry for spraying to the nozzles 4 in the spraying layer 2 through the desulfurization slurry circulating pump 3, and when the load of the boiler is reduced, the desulfurization slurry circulating pumps 3 correspondingly communicated with the spraying layers 2 are sequentially closed according to the sequence from low to high of the spraying layers 2;
when the load of the boiler is increased, the desulfurization slurry circulating pumps 3 correspondingly communicated with the spraying layers 2 are sequentially started according to the sequence from high to low of the spraying layers 2.
Through detection, the configuration method of the desulfurization slurry amount in the embodiment 1 is adopted, so that the spraying amount of the desulfurization slurry in each spraying layer 2 in the tower is matched with the falling dead time of the desulfurization slurry in flue gas, the utilization degree of an absorbent in the desulfurization slurry is improved, the calcium-sulfur molar ratio and the liquid-gas ratio are reduced, and the desulfurization efficiency is improved; during load adjustment, the desulfurization slurry circulating pump 3 is switched on and off in an optimized sequence in the embodiment 1, and more power combination modes of the desulfurization slurry circulating pump groups exist, so that the step discontinuity of the load adjustment of the desulfurization system can be improved, the total power of all the desulfurization slurry circulating pumps 3 is slowly, continuously and stably reduced or increased, the boiler load which is continuously and stably changed is more matched, and the energy consumption loss of the desulfurization slurry circulating pump 3 is reduced.
Example 2
A method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower is characterized in that the spraying amounts of the desulfurization slurry in spraying layers 2 with different heights in a desulfurization tower 1 are configured in unequal amounts;
the desulfurizing tower 1 comprises 4 spraying layers 2 in total, and the spraying amount of the desulfurizing slurry of each spraying layer 2 is respectively as follows: g1＝0.7G0-4，G2＝0.85G0-4，G3＝1.3G0-4，G4＝1.15G0-4Wherein G is0-4The single-layer spraying amount is that when the desulfurizing tower 1 comprises 4 spraying layers 2 in total and each spraying layer 2 adopts the design of equal spraying amount;
each spraying layer 2 is communicated with a desulfurization slurry circulating pump 3 so as to provide desulfurization slurry for spraying to the nozzles 4 in the spraying layer 2 through the desulfurization slurry circulating pump 3, and when the load of the boiler is reduced, the desulfurization slurry circulating pumps 3 correspondingly communicated with the spraying layers 2 are sequentially closed according to the sequence from low to high of the spraying layers 2;
when the load of the boiler is increased, the desulfurization slurry circulating pumps 3 correspondingly communicated with the spraying layers 2 are sequentially started according to the sequence from high to low of the spraying layers 2.
Through detection, the configuration method of the desulfurization slurry amount in the embodiment 2 is adopted, so that the spraying amount of the desulfurization slurry in each spraying layer 2 in the tower is matched with the falling dead time of the desulfurization slurry in flue gas, the utilization degree of an absorbent in the desulfurization slurry is improved, the calcium-sulfur molar ratio and the liquid-gas ratio are reduced, and the desulfurization efficiency is improved; during load adjustment, the desulfurization slurry circulating pump 3 is switched on and off in an optimized sequence in the embodiment 2, and more power combination modes of the desulfurization slurry circulating pump groups exist, so that the step discontinuity of the load adjustment of the desulfurization system can be improved, the total power of all the desulfurization slurry circulating pumps 3 is slowly, continuously and stably reduced or increased, the boiler load which is continuously and stably changed is more matched, and the energy consumption loss of the desulfurization slurry circulating pump 3 is reduced.
Example 3
A method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower is characterized in that the spraying amounts of the desulfurization slurry in spraying layers 2 with different heights in a desulfurization tower 1 are configured in unequal amounts;
the desulfurizing tower 1 comprises 5 spraying layers 2 in total, and the spraying amount of the desulfurizing slurry of each spraying layer 2 is respectively as follows: g1＝0.65G0-5，G2＝0.8G0-5，G3＝1.1G0-5，G4＝1.35G0-5，G5＝1.1G0-5Wherein G is0-5The single-layer spraying amount is that when the desulfurizing tower 1 comprises 5 spraying layers 2 in total and each spraying layer 2 adopts the design of equal spraying amount;
each spraying layer 2 is communicated with a desulfurization slurry circulating pump 3 so as to provide desulfurization slurry for spraying to the nozzles 4 in the spraying layer 2 through the desulfurization slurry circulating pump 3, and when the load of the boiler is reduced, the desulfurization slurry circulating pumps 3 correspondingly communicated with the spraying layers 2 are sequentially closed according to the sequence from low to high of the spraying layers 2;
when the load of the boiler is increased, the desulfurization slurry circulating pumps 3 correspondingly communicated with the spraying layers 2 are sequentially started according to the sequence from high to low of the spraying layers 2.
Through detection, the configuration method of the desulfurization slurry amount in the embodiment 3 is adopted, so that the spraying amount of the desulfurization slurry in each spraying layer 2 in the tower is matched with the falling dead time of the desulfurization slurry in flue gas, the utilization degree of an absorbent in the desulfurization slurry is improved, the calcium-sulfur molar ratio and the liquid-gas ratio are reduced, and the desulfurization efficiency is improved; during load adjustment, the desulfurization slurry circulating pump 3 is switched on and off in an optimized sequence in the embodiment 3, and more power combination modes of the desulfurization slurry circulating pump groups exist, so that the step discontinuity of the load adjustment of the desulfurization system can be improved, the total power of all the desulfurization slurry circulating pumps 3 is slowly, continuously and stably reduced or increased, the boiler load which is continuously and stably changed is more matched, and the energy consumption loss of the desulfurization slurry circulating pump 3 is reduced.
Methods and devices not described in detail in the present invention are all the prior art and are not described in detail.
The principles and embodiments of the present invention are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (5)
1. A method for configuring the amount of multilayer spraying desulfurization slurry in a wet desulfurization tower is characterized in that the spraying amounts of the desulfurization slurry in spraying layers with different heights in the desulfurization tower are configured in unequal amounts;
the spraying amount of the desulfurization slurry in each spraying layer is G in sequence from low to high1、G2、…、Gm-1、GmWherein m is the mth spray layer from low to high, and m is 3, 4, 5, 6, 7, 8 or 9.
2. The method for allocating the amount of the multilayer sprayed desulfurization slurry in the wet desulfurization tower according to claim 1, wherein when the desulfurization tower comprises a total of 3 spraying layers, the spraying amount of the desulfurization slurry in each spraying layer is: 0.7G0-3≤G1≤0.85G0-3，0.9G0-3≤G2≤1.15G0-3，G0-3≤G3≤1.3G0-3Wherein G is0-3The single-layer spraying amount is the single-layer spraying amount when 3 spraying layers are totally included in the desulfurizing tower and each spraying layer is designed to be equal in spraying amount.
3. The method for allocating the amount of the multilayer sprayed desulfurization slurry in the wet desulfurization tower according to claim 1, wherein when the desulfurization tower comprises a total of 4 spraying layers, the spraying amount of the desulfurization slurry in each spraying layer is: 0.65G0-4≤G1≤0.8G0-4，0.8G0-4≤G2≤0.95G0-4，1.1G0-4≤G3≤1.35G0-4，G0-4≤G4≤1.2G0-4Wherein G is0-4The single-layer spraying amount is designed when 4 spraying layers are included in the desulfurization tower and the spraying layers adopt equal spraying amount.
4. The method for configuring the amount of the multilayer sprayed desulfurization slurry in the wet desulfurization tower according to claim 1, wherein when the desulfurization tower comprises a total of 5 spraying layers, the spraying amount of the desulfurization slurry in each spraying layer is: 0.6G0-5≤G1≤0.8G0-5，0.8G0-5≤G2≤0.95G0-5，0.95G0-5≤G3≤1.1G0-5，1.2G0-5≤G4≤1.4G0-5，G0-5≤G5≤1.3G0-5Wherein G is0-5The single-layer spraying amount is the single-layer spraying amount when the total 5 spraying layers are included in the desulfurizing tower and each spraying layer is designed to be equal in spraying amount.
5. The method for configuring the amount of the multilayer sprayed desulfurization slurry in the wet desulfurization tower according to any one of claims 1 to 4, wherein a desulfurization slurry circulating pump is connected to each spraying layer so that desulfurization slurry is supplied from the desulfurization slurry circulating pump to the nozzles in the spraying layer for spraying, and when the boiler load is reduced, the desulfurization slurry circulating pumps connected to the spraying layers are sequentially turned off in the order of the spraying layers from low to high;
when the load of the boiler is increased, the desulfurization slurry circulating pumps correspondingly communicated with the spraying layers are sequentially started according to the sequence from high to low of the spraying layers.
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|---|---|---|---|---|
| CN113655824A (en) * | 2021-07-05 | 2021-11-16 | 国能龙源环保有限公司 | Wet desulphurization spraying amount and spraying slurry pH value coupling control optimization method |
| CN113655824B (en) * | 2021-07-05 | 2022-04-22 | 国能龙源环保有限公司 | Wet desulphurization spraying amount and spraying slurry pH value coupling control optimization method |
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Application publication date: 20200417 |