Ammonium chloride drying circulation tail gas cooling finished product system

Abstract

The utility model discloses an ammonium chloride drying circulation tail gas cooling finished product system in the field of recycling of heat of an ammonium chloride closed-loop circulation drying system. After being purified and dehumidified by a tail gas closed-loop circulation system, tail gas of a steam rotary ammonium drying furnace exchanges heat with a high-temperature product, is heated and then is fed into the steam rotary ammonium drying furnace to be used as moisture-carrying gas. In the implementation process, high-temperature dry ammonium tail gas carrying water vapor, ammonia and dust is subjected to gas-solid separation, washing, cooling, dust removal, water removal and ammonia removal in an existing tail gas closed-loop circulation system and then fed into a product cooling fluidized bed to exchange heat with high-temperature discharged materials of a steam rotary dry ammonium furnace, heat brought out by a finished product is recycled, the temperature of the finished product is reduced, and the temperature of purified gas is increased. And the heated circulating tail gas enters the steam rotary dry ammonium furnace again to carry moisture. The device not only retains the advantage of the existing tail gas closed-loop cyclic utilization, but also realizes heat cyclic utilization, and plays the roles of energy conservation and emission reduction.

Description

Technical Field

[0001] The utility model relates to the field of heat recovery and utilization of an ammonium chloride closed-circuit circulation drying system, in particular to an ammonium chloride drying circulation tail gas cooling finished product system. Background Art

[0002] To reduce tail gas emissions, current ammonium chloride drying systems utilize a closed-loop tail gas cycle, but this results in high investment and operating costs. Compared to fluidized bed technology, the use of a steam rotary ammonium chloride drying furnace significantly reduces tail gas volumes, lowering both the investment and operating costs of a closed-loop tail gas cycle. However, in the existing closed-loop tail gas treatment process, after cooling and removing ammonia and water, the tail gas must be heated before entering the steam rotary ammonium chloride drying furnace to act as a moisture carrier. Furthermore, the high-temperature product must be cooled before packaging. This results in inefficient energy utilization in the entire system.

[0003] Based on this, the utility model designs an ammonium chloride drying cycle tail gas cooling finished product system to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide an ammonium chloride drying cycle tail gas cooling finished product system to solve the problem of insufficient energy utilization of the entire system in the existing tail gas closed-loop circulation process proposed in the above background art. The tail gas needs to be heated after cooling and removing ammonia and water before entering the steam rotary ammonium drying furnace to carry moisture. At the same time, the high-temperature product also needs to be cooled before packaging.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a system for cooling the finished product of ammonium chloride drying cycle tail gas, comprising a gas-solid heat exchange device and a steam rotary ammonium drying furnace, the gas-solid heat exchange device comprising: a high-temperature product feed port, a cold material discharge port, a cold cycle tail gas inlet and a hot cycle tail gas outlet, the high-temperature product feed port is sequentially connected to the conveying equipment, the steam rotary ammonium drying furnace discharge equipment, the steam rotary ammonium drying furnace discharge port, the steam rotary ammonium drying furnace and the feeding system, the cold material discharge port is sequentially connected to the gas-solid heat exchange equipment discharge equipment, the conveying equipment and the finished product crushing and packaging system; the cold cycle tail gas inlet is sequentially connected to the fan, the tail gas closed-loop circulation treatment system outlet, the tail gas closed-loop circulation treatment system and the steam rotary ammonium drying furnace through a pipeline, the hot cycle tail gas outlet is sequentially connected to the tail gas treatment system, the steam rotary ammonium drying furnace moisture inlet and the steam rotary ammonium drying furnace through a pipeline, the tail gas at the outlet of the steam rotary ammonium drying furnace is connected to the inlet of the tail gas closed-loop circulation treatment system.

[0006] Preferably, the gas-solid heat exchange equipment is a cooling fluidized bed.

[0007] Preferably, the exhaust gas treatment system includes: an exhaust gas dry dust removal system and a centrifugal fan, and the exhaust gas dry dust removal system includes: a cyclone separator, a bag dust collector, and an electrostatic precipitator.

[0008] Preferably, the moisture inlet of the steam rotary ammonium drying furnace is arranged at the head of the steam rotary ammonium drying furnace, carrying moisture and material downstream, or is arranged at the tail of the steam rotary ammonium drying furnace, carrying moisture and material countercurrent.

[0009] Preferably, the moisture-carrying gas inlet of the steam rotary ammonium drying furnace head is connected to the gas heating system and the tail gas treatment system in sequence through a pipeline; the moisture-carrying gas inlet at the furnace tail is connected to the tail gas treatment system through a pipeline.

[0010] Preferably, the steam rotary ammonium drying furnace is a steam rotary ammonium drying furnace that returns materials to itself or to an external source.

[0011] Preferably, the exhaust gas closed-loop circulation treatment system includes indirect condensation of the circulating exhaust gas by chilled water and indirect cooling of the circulating exhaust gas and circulating washing water.

[0012] Preferably, the exhaust gas closed-loop treatment system includes chilled water, which can be produced by utilizing waste heat from high-temperature steam condensate in the system.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the present invention solves the problem of high energy consumption in closed-loop exhaust gas treatment caused by first freezing and cooling the exhaust gas and then heating it up by cooling the fluidized bed, while eliminating the cooling system for the post-process products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 This is a schematic diagram of the utility model in which the moisture-carrying gas enters the rear end of the steam rotary ammonium drying furnace and flows countercurrently with the material;

[0016] Figure 2 This is a schematic diagram of the utility model of moisture-carrying gas flowing from the head of the steam rotary ammonium drying furnace into the material flow;

[0017] Figure 3 This is a schematic diagram of the structure of the cooling fluidized bed of the utility model from a front view;

[0018] Figure 4 This is a schematic diagram of the structure of the cooling fluidized bed of the utility model from the left perspective;

[0019] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0020] 1-steam rotary ammonium drying furnace, 2-cooling fluidized bed, 3-exhaust gas treatment system, 4-exhaust gas closed-loop circulation treatment system, 5-fan, 6-finished product crushing and packaging system, 7-feeding system, 8-gas heating system, 201-cold material discharge port, 202-hot cycle exhaust gas outlet, 203-high temperature product feed port, 204-cooling fluidized bed expansion section, 205-fluidized bed vulcanization section, 206-wind chamber, 207-cold cycle exhaust gas inlet. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Figures 1 to 4 , and describes the application in detail with reference to embodiments.

[0023] Example 1

[0024] As attached Figure 1 , Attachment Figure 3 and attached Figure 4 As shown, the gas-solid heat exchange equipment and the steam rotary ammonium drying furnace 1, the gas-solid heat exchange equipment includes: a high-temperature product feed port 203, a cold material discharge port 201, a cold cycle tail gas inlet 207 and a hot cycle tail gas outlet 202, which is characterized in that: the high-temperature product feed port 203 is sequentially connected to the conveying equipment, the steam rotary ammonium drying furnace discharge equipment, the steam rotary ammonium drying furnace discharge port, the steam rotary ammonium drying furnace 1 and the feeding system 7, and the cold material discharge port 201 is sequentially connected to the gas-solid heat exchange equipment discharge equipment, the conveying equipment, and the finished product crushing and packaging system 6; the cold cycle tail gas inlet 207 is sequentially connected to the fan 5, the tail gas closed-loop circulation treatment system 4 and the steam rotary ammonium drying furnace 1 through a pipeline, and the hot cycle tail gas outlet 202 is sequentially connected to the tail gas treatment system 3, the steam rotary ammonium drying furnace moisture inlet, and the steam rotary ammonium drying furnace 1 through a pipeline, and the tail gas at the outlet of the steam rotary ammonium drying furnace 1 is connected to the inlet of the tail gas closed-loop circulation treatment system 4.

[0025] As attached Figure 3 As shown, the gas-solid heat exchange equipment is a cooling fluidized bed 2.

[0026] As attached Figure 1 , Attachment Figure 3 and attached Figure 4 As shown, a cold material discharge port 201 is provided on the side wall of the shell, a hot cycle exhaust gas outlet 202 is provided on the upper middle part of the shell, a high-temperature product feed port 203 is provided on the upper part of the shell away from the middle, a cold cycle exhaust gas inlet 207 is provided on the side wall of the shell near the bottom, a cooling fluidized bed expansion section 204 is provided on the upper part of the shell, a fluidized bed vulcanization section 205 is provided below the cooling fluidized bed expansion section 204, and a wind chamber 206 is provided below the fluidized bed vulcanization section 205.

[0027] As attached Figure 1 As shown, the exhaust gas treatment system 3 includes: an exhaust gas dry dust removal system and a centrifugal fan. The exhaust gas dry dust removal system includes: a cyclone separator, a bag dust collector, and an electrostatic precipitator.

[0028] As attached Figure 1 and attached Figure 2 As shown, the moisture inlet of the steam rotary ammonium drying furnace is set at the head of the steam rotary ammonium drying furnace 1, carrying moisture and material downstream, or is set at the tail of the steam rotary ammonium drying furnace 1, carrying moisture and material countercurrent.

[0029] As attached Figure 1 As shown, the steam rotary ammonium drying furnace 1 is a steam rotary ammonium drying furnace 1 that returns materials to itself or to the outside.

[0030] As attached Figure 1 As shown, the exhaust gas closed-loop circulation treatment system 4 includes indirect condensation of the circulating exhaust gas by chilled water and indirect cooling of the circulating exhaust gas and circulating washing water.

[0031] As attached Figure 1 As shown, the exhaust gas closed-loop treatment system 4 includes chilled water, which can be produced by utilizing the waste heat of high-temperature steam condensate in the system.

[0032] The principle of embodiment 1 work is: the present embodiment is for carrying moisture and entering from steam rotary ammonium drying furnace 1 afterbody, with material countercurrent.The cold cycle tail gas air inlet 207 pipelines of cooling fluidized bed 2 are connected to the tail gas outlet of tail gas closed-circuit circulation treatment system 4, both connecting pipes are provided with blower fan 5, the tail gas from tail gas closed-circuit circulation treatment system 4 is pressurized, tail gas is entered from cooling fluidized bed 2 bottom air chambers 206, in cooling fluidized bed 2, carry out direct heat exchange with the high-temperature material from steam rotary ammonium drying furnace 1, tail gas after heating up enters tail gas treatment system 3, after dry method removes dust in tail gas treatment system 3, under the centrifugal fan effect of tail gas treatment system 3, tail gas after heating up carries moisture inlet from steam rotary ammonium drying furnace 1 afterbody and enters steam rotary ammonium drying furnace 1.

[0033] The high-temperature product feed port 203 of the cooling fluidized bed 2 is connected to the discharge port of the steam rotary ammonium drying furnace 1 through a conveying and discharging device. The conveying device sends the high-temperature discharge of the steam rotary ammonium drying furnace 1 to the high-temperature product feed port 203 on the upper part of the cooling fluidized bed 2, and directly exchanges heat with the circulating exhaust gas from the exhaust closed-loop circulation treatment system 4. After cooling, it is pushed by the circulating exhaust gas to reach the cold material discharge port 201 of the cooling fluidized bed 2. The cold material discharge port 201 is connected to the finished product crushing and packaging system 6, and the two are connected by a conveying device.

[0034] Example 2

[0035] On the basis of Example 1, as shown in the attached Figure 2 As shown, the wet gas inlet arranged at the furnace head of the steam rotary ammonium drying furnace 1 is connected to the gas heating system 8 and the tail gas treatment system 3 in sequence through a pipeline, and the wet gas inlet arranged at the furnace tail is connected to the tail gas treatment system 3 through a pipeline.

[0036] In the present embodiment, the wet gas enters from the head of the steam rotary ammonium drying furnace 1 and flows downstream with the material. The cold cycle tail gas inlet 207 pipeline of the cooling fluidized bed 2 is connected to the tail gas outlet of the tail gas closed-circuit circulation treatment system 4. A blower 5 is provided on the connecting pipe of the two. The tail gas from the tail gas closed-circuit circulation treatment system 4 is pressurized and enters from the wind chamber 206 at the bottom of the cooling fluidized bed 2. Direct heat exchange is performed with the high-temperature discharging from the steam rotary ammonium drying furnace 1. The tail gas after heating enters the tail gas treatment system 3. After dry dust removal in the tail gas treatment system 3, it enters the gas heating system 8 and exchanges heat with the steam condensate from the steam rotary ammonium drying furnace 1. After further increasing the tail gas temperature, the wet gas inlet of the steam rotary ammonium drying furnace 1 burner enters the steam rotary ammonium drying furnace 1.

[0037] The high-temperature product feed port 203 of the cooling fluidized bed 2 is connected to the discharge port of the steam rotary ammonium drying furnace 1 through a conveying and discharging device. The conveying device sends the high-temperature discharge of the steam rotary ammonium drying furnace 1 to the high-temperature product feed port 203 on the upper part of the cooling fluidized bed 2, and directly exchanges heat with the circulating exhaust gas from the exhaust gas closed-loop circulation treatment system 4. After cooling, it is pushed to the cold material discharge port 201 of the cooling fluidized bed 2 by the circulating exhaust gas. The cold material discharge port 201 is connected to the finished product crushing and packaging system 6 below, and the two are connected through a conveying device.

[0038] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0039] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An ammonium chloride drying cycle tail gas cooling finished product system, comprising a gas-solid heat exchange device and a steam rotary ammonium drying furnace (1), wherein the gas-solid heat exchange device comprises: The high-temperature product feed port (203), the cold material discharge port (201), the cold cycle tail gas inlet (207) and the hot cycle tail gas outlet (202) are characterized in that: the high-temperature product feed port (203) is sequentially connected to the conveying equipment, the steam rotary ammonium drying furnace (1) discharge equipment, the steam rotary ammonium drying furnace discharge port, the steam rotary ammonium drying furnace (1) and the feeding system (7); the cold material discharge port (201) is sequentially connected to the gas-solid heat exchange equipment discharge equipment, the conveying equipment , finished product crushing and packaging system (6); the cold cycle tail gas inlet (207) is connected to the fan (5), the tail gas closed-circuit cycle treatment system (4) and the steam rotary ammonium drying furnace (1) in sequence through a pipeline, and the hot cycle tail gas outlet (202) is connected to the tail gas treatment system (3), the steam rotary ammonium drying furnace moisture inlet, and the steam rotary ammonium drying furnace (1) in sequence through a pipeline, and the tail gas at the outlet of the steam rotary ammonium drying furnace (1) is connected to the inlet of the tail gas closed-circuit cycle treatment system (4).

2. A finished product cooling system for drying and circulating ammonium chloride tail gas according to claim 1, characterized in that: The gas-solid heat exchange equipment is a cooling fluidized bed (2).

3. A finished product cooling system for drying and circulating ammonium chloride tail gas according to claim 1, characterized in that: The tail gas treatment system (3) comprises: a tail gas dry dust removal system and a centrifugal fan, and the tail gas dry dust removal system comprises: a cyclone separator, a bag dust collector, and an electrostatic precipitator.

4. The ammonium chloride drying cycle tail gas cooling finished product system according to claim 3, characterized in that: The steam rotary ammonium drying furnace moisture inlet is arranged at the steam rotary ammonium drying furnace (1) furnace head, carrying moisture and material in the same flow, or is arranged at the steam rotary ammonium drying furnace (1) furnace tail, carrying moisture and material in the opposite flow.

5. The ammonium chloride drying cycle tail gas cooling finished product system according to claim 3, characterized in that: The moisture-carrying gas inlet at the furnace head of the steam rotary ammonium drying furnace (1) is connected to the gas heating system (8) and the tail gas treatment system (3) in sequence through a pipeline; the moisture-carrying gas inlet at the furnace tail is connected to the tail gas treatment system (3) through a pipeline.

6. The ammonium chloride drying cycle tail gas cooling finished product system according to claim 5, characterized in that: The steam rotary ammonium drying furnace (1) is a steam rotary ammonium drying furnace (1) that returns materials to itself or to an external source.

7. The ammonium chloride drying cycle tail gas cooling finished product system according to claim 1, characterized in that: The tail gas closed-circuit circulation treatment system (4) includes indirect condensation of the circulating tail gas by chilled water and indirect cooling of the circulating tail gas and circulating washing water.

8. The ammonium chloride drying cycle tail gas cooling finished product system according to claim 3, characterized in that: The tail gas closed-loop circulation treatment system (4) includes chilled water, which can be produced by utilizing the waste heat of high-temperature steam condensed water in the system.

Images