Detoxification and regeneration system for wet desulphurization slurry poisoning

Abstract

The utility model relates to a detoxification and regeneration system for wet desulphurization slurry poisoning. The detoxification and regeneration system comprises a slurry discharge pump, a 1 # oxidation separator, a 1 # slurry plug-flow pump, a 2 # oxidation separator, a 2 # slurry plug-flow pump, a 3 # oxidation separator, a slurry recycling pump, an ozone adding system, a tail gas treatment system and a foam collecting system, wherein the slurry discharge pump is used for being connected with the lower part of a desulfurization absorption tower, and the outlet end of the slurry discharge pump is connected with the lower part of the 1 # oxidation separator; the inlet end of the 1 # slurry plug flow pump is connected with the upper part of the 1 # oxidation separator, and the outlet end of the 1 # slurry plug flow pump is connected with the lower part of the 2 # oxidation separator; the inlet end of the 2 # slurry plug flow pump is connected with the upper part of the 2 # oxidation separator, and the outlet end of the 2 # slurry plug flow pump is connected with the lower part of the 3 # oxidation separator; and the inlet end of the slurry recycling pump is connected with the upper part of the 3 # oxidation separator. By adopting the system, the deep regeneration of the slurry can be realized, and the applicability is wide.

Description

Technical Field

[0001] The utility model relates to a desulfurization tower poisoned slurry recycling technology, in particular to a detoxification and regeneration system for wet desulfurization slurry poisoning. Background Art

[0002] With the increasingly stringent national environmental protection policies, most of the in-service thermal power units and newly built thermal power units are equipped with flue gas desulfurization devices to ensure that the boiler flue gas meets the emission standards. At present, the most widely used flue gas desulfurization device in coal-fired power plants is the limestone-gypsum wet desulfurization process, in which limestone, as an absorbent of sulfur dioxide, is the main raw material of the limestone-gypsum wet desulfurization process. However, during the operation of the desulfurization system, the desulfurization tower slurry poisoning phenomenon may occur.

[0003] There are many different opinions on the causes of desulfurization tower slurry poisoning, which can basically be summarized as: 1. Limestone blind area; 2. High slurry density; 3. High dust content or high heavy metal content; 4. Insufficient oxidation air volume; 5. Poor process water quality; 6. High chloride ion content; 7. Excessive fluoride ion content; 8. Poor limestone quality; 9. Oil content in slurry. At present, the common measure taken after the desulfurization tower limestone slurry is poisoning is to replace the slurry, and gradually replace the poisoned slurry with fresh slurry. The replaced poisoned slurry is generally used to flush ash and slag, and some are directly discarded through the discard pipeline, resulting in waste of resources and increased operating costs. Although a small number of power plants have solved their own slurry poisoning problems through operation adjustment, chemical treatment and other methods, these methods are highly targeted and should not be promoted. Therefore, it is necessary to design a universal device for treating poisoned slurry in the desulfurization tower of a coal-fired power plant. Utility Model Content

[0004] In view of the above problems, the utility model provides a detoxification and regeneration system for wet desulfurization slurry poisoning, which adopts ozone technology to treat the slurry poisoning problem without introducing new additives, retains the original characteristics of the slurry to the greatest extent for regeneration, and the regenerated slurry is highly applicable for reuse in the desulfurization tower without affecting the original desulfurization process, and has wide practicality.

[0005] In order to solve this technical problem, the utility model adopts the following solutions:

[0006] A detoxification and regeneration system for wet desulfurization slurry poisoning, comprising a slurry discharge pump, a No. 1 oxidation separator, a No. 1 slurry plug flow pump, a No. 2 oxidation separator, a No. 2 slurry plug flow pump, a No. 3 oxidation separator, a slurry recycling pump, an ozone dosing system, an exhaust gas treatment system and a foam collection system; wherein,

[0007] The slurry discharge pump is used to be connected to the lower part of the desulfurization absorption tower, and the outlet end of the slurry discharge pump is connected to the lower part of the 1# oxidation separator; the inlet end of the 1# slurry plug flow pump is connected to the upper part of the 1# oxidation separator, and the outlet end of the 1# slurry plug flow pump is connected to the lower part of the 2# oxidation separator; the inlet end of the 2# slurry plug flow pump is connected to the upper part of the 2# oxidation separator, and the outlet end of the 2# slurry plug flow pump is connected to the lower part of the 3# oxidation separator; the inlet end of the slurry reuse pump is connected to the upper part of the 3# oxidation separator;

[0008] The foam collection system is connected to the top of the 1# oxidation separator, the 2# oxidation separator, and the 3# oxidation separator respectively, the ozone addition system is connected to the bottom of the 3# oxidation separator, the 1# oxidation separator, the 2# oxidation separator, and the 3# oxidation separator are connected in series in sequence, and the top of the 1# oxidation separator is connected to the exhaust gas treatment system, so that ozone passes through the bottom of the 3# oxidation separator, the top of the 3# oxidation separator, the bottom of the 2# oxidation separator, the top of the 2# oxidation separator, the bottom of the 1# oxidation separator, and the top of the 1# oxidation separator in sequence, and is discharged from the top of the 1# oxidation separator into the exhaust gas treatment system.

[0009] Furthermore, the top of the 3# oxidation separator is connected to the bottom of the 2# oxidation separator through a pipeline, and the top of the 2# oxidation separator is connected to the bottom of the 1# oxidation separator through a pipeline, so that the 1# oxidation separator, the 2# oxidation separator, and the 3# oxidation separator are connected in series in sequence.

[0010] Furthermore, the foam collection system includes a foam trap.

[0011] Furthermore, the ozone dosing system includes an ozone generator and a fan.

[0012] Furthermore, the slurry discharge pump is a mortar pump.

[0013] Furthermore, the slurry recycling pump is a stainless steel slurry pump.

[0014] Furthermore, the outlet end of the slurry recycling pump is connected to the desulfurization absorption tower.

[0015] By adopting the above technical solution, the utility model has the following advantages compared with the prior art:

[0016] 1. This system can be used as a universal method to solve the problem of slurry poisoning, with strong applicability and promotion value;

[0017] 2. The system can quickly restore the desulfurization efficiency without affecting the original desulfurization process, and thus will basically not cause load limit on the unit and affect power generation;

[0018] 3. The system uses a multi-stage circulation detoxification and regeneration system to realize the recycling of slurry and achieve deep detoxification and regeneration of slurry;

[0019] 4. The system is equipped with a foam collection system, which can solve the problem of large amounts of foaming in the absorption tower and relieve the pressure on the blower;

[0020] 5. The system is used to regenerate slurry regularly, which improves the quality of gypsum, increases the comprehensive utilization value of gypsum, and avoids the environmental risks of storing and transporting muddy gypsum. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the device provided by the embodiment of the utility model;

[0022] Explanations in the figure: 1-desulfurization absorption tower; 2-slurry discharge pump; 3-1# oxidation separator; 4-1# slurry plug flow pump; 5-2# oxidation separator; 6-foam collection system; 7-2# slurry plug flow pump; 8-3# oxidation separator; 9-slurry reuse pump; 10-ozone dosing system; 11-exhaust gas treatment system. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1:

[0027] refer to Figure 1 A detoxification and regeneration system for wet desulfurization slurry poisoning includes a desulfurization absorption tower 1, the lower part of the desulfurization absorption tower 1 is connected to the inlet end of a slurry discharge pump 2, the outlet end of the slurry discharge pump 2 is connected to the lower part of a No. 1 oxidation separator 3, and the slurry discharge pump 2 is used to pump the poisoned slurry in the desulfurization absorption tower 1 to the No. 1 oxidation separator 3 for preliminary stripping and separation.

[0028] The inlet end of the 1# slurry plug flow pump 4 is connected to the upper part of the 1# oxidation separator 3, and the outlet end of the 1# slurry plug flow pump 4 is connected to the lower part of the 2# oxidation separator 5. The 1# slurry plug flow pump 4 is used to pump the poisoned slurry after preliminary stripping and separation in the 1# oxidation separator 3 to the 2# oxidation separator 5 for preliminary oxidation.

[0029] The inlet end of the 2# slurry plug flow pump 7 is connected to the upper part of the 2# oxidation separator 5, and the outlet end of the 2# slurry plug flow pump 7 is connected to the lower part of the 3# oxidation separator 8. The 2# slurry plug flow pump 7 is used to pump the poisoned slurry after preliminary oxidation in the 2# oxidation separator 5 to the 3# oxidation separator 8 for deep oxidation.

[0030] The inlet end of the slurry recycling pump 9 is connected to the upper part of the 3# oxidation separator 8. The slurry recycling pump 9 is used to recycle the poisoned slurry after deep oxidation in the 3# oxidation separator 8. For example, it can be recycled to the desulfurization absorption tower 1. At this time, the outlet end of the slurry recycling pump 9 is connected to the desulfurization absorption tower 1, and is combined with the original fresh slurry to enter the desulfurization absorption tower 1.

[0031] In the above system, the slurry discharge pump is a mortar pump, which can be applied to a variety of different poisoned slurries, and the slurry recycling pump is a stainless steel slurry pump.

[0032] In the above system, the ozone dosing system 10 is connected to the bottom of the 3# oxidation separator 8, so that ozone passes through the bottom of the 3# oxidation separator, the top of the 3# oxidation separator, the bottom of the 2# oxidation separator, the top of the 2# oxidation separator, the bottom of the 1# oxidation separator and the top of the 1# oxidation separator in sequence, and is discharged from the top of the 1# oxidation separator to enter the tail gas treatment system 11 for tail gas treatment. In a specific embodiment, the ozone dosing system 10 includes an ozone generator and a fan.

[0033] In the above system, the foam generated at the top of the three oxidation separators is collected and processed by the foam collection system 6. In a specific embodiment, the foam collection system 6 may include a fully automatic foam trap.

[0034] The above system was used to treat the desulfurization tower slurry of flue gas desulfurization in a coal-fired power plant. The utilization rate of ozone exceeded 95%, and the reuse rate of the treated regenerated slurry exceeded 90%.

[0035] Comparative Example 1:

[0036] This comparative example adopts a single-stage oxidation separator to treat the desulfurization tower slurry of flue gas desulfurization in a coal-fired power plant. Specifically, the treatment system includes a desulfurization absorption tower 1, the lower part of the desulfurization absorption tower 1 is connected to the inlet end of a slurry discharge pump 2, and the outlet end of the slurry discharge pump 2 is connected to the lower part of a 1# oxidation separator 3. The slurry discharge pump 2 is used to pump the poisoned slurry in the desulfurization absorption tower 1 to the 1# oxidation separator 3 for stripping and separation, and the upper part of the 1# oxidation separator 3 is connected to the inlet end of a slurry recycling pump 9.

[0037] In the above system, the ozone dosing system 10 is connected to the bottom of the 1# oxidation separator 3, so that ozone runs through the bottom of the 1# oxidation separator, the upper part of the 1# oxidation separator, and is discharged from the upper part of the 1# oxidation separator to enter the tail gas treatment system 11 for tail gas treatment. In a specific embodiment, the ozone dosing system 10 includes an ozone generator and a fan. The foam generated at the top of the 1# oxidation separator is collected and processed by the foam collection system 6. In a specific embodiment, the foam collection system 6 can include a fully automatic foam trap.

[0038] When the above-mentioned single-stage oxidation separator is used, the utilization rate of ozone is less than 20%, and the regenerated slurry after treatment cannot be directly recycled to the desulfurization absorption tower because the chloride ion content and the fluoride ion content exceed the standard.

[0039] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A detoxification and regeneration system for wet desulfurization slurry poisoning, characterized in that: It includes slurry discharge pump, 1# oxidation separator, 1# slurry plug flow pump, 2# oxidation separator, 2# slurry plug flow pump, 3# oxidation separator, slurry recycling pump, ozone dosing system, tail gas treatment system and foam collection system; among which, The slurry discharge pump is used to be connected to the lower part of the desulfurization absorption tower, and the outlet end of the slurry discharge pump is connected to the lower part of the 1# oxidation separator; the inlet end of the 1# slurry plug flow pump is connected to the upper part of the 1# oxidation separator, and the outlet end of the 1# slurry plug flow pump is connected to the lower part of the 2# oxidation separator; the inlet end of the 2# slurry plug flow pump is connected to the upper part of the 2# oxidation separator, and the outlet end of the 2# slurry plug flow pump is connected to the lower part of the 3# oxidation separator; the inlet end of the slurry reuse pump is connected to the upper part of the 3# oxidation separator; The foam collection system is connected to the top of the 1# oxidation separator, the 2# oxidation separator, and the 3# oxidation separator respectively, the ozone addition system is connected to the bottom of the 3# oxidation separator, the 1# oxidation separator, the 2# oxidation separator, and the 3# oxidation separator are connected in series in sequence, and the top of the 1# oxidation separator is connected to the exhaust gas treatment system, so that ozone passes through the bottom of the 3# oxidation separator, the top of the 3# oxidation separator, the bottom of the 2# oxidation separator, the top of the 2# oxidation separator, the bottom of the 1# oxidation separator, and the top of the 1# oxidation separator in sequence, and is discharged from the top of the 1# oxidation separator into the exhaust gas treatment system.

2. The detoxification and regeneration system for wet desulfurization slurry poisoning according to claim 1 is characterized in that: The top of the 3# oxidation separator is connected to the bottom of the 2# oxidation separator through a pipeline, and the top of the 2# oxidation separator is connected to the bottom of the 1# oxidation separator through a pipeline, so that the 1# oxidation separator, the 2# oxidation separator, and the 3# oxidation separator are connected in series in sequence.

3. The detoxification and regeneration system for wet desulfurization slurry poisoning according to claim 1 is characterized in that: The foam collection system includes a foam trap.

4. The detoxification and regeneration system for wet desulfurization slurry poisoning according to claim 1 is characterized in that: The ozone dosing system comprises an ozone generator and a fan.

5. The detoxification and regeneration system for wet desulfurization slurry poisoning according to any one of claims 1 to 4, characterized in that: The slurry discharge pump is a mortar pump.

6. The detoxification and regeneration system for wet desulfurization slurry poisoning according to any one of claims 1 to 4, characterized in that: The slurry recycling pump is a stainless steel slurry pump.

7. The detoxification and regeneration system for wet desulfurization slurry poisoning according to any one of claims 1 to 4, characterized in that: The outlet end of the slurry recycling pump is connected to the desulfurization absorption tower.

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