CO2 carbonization maintenance device suitable for generating aggregate from steel slag-phosphogypsum solid waste

Abstract

The utility model discloses a CO2 carbonization maintenance device suitable for generating aggregate from steel slag-ardealite solid waste, which comprises a waste heat recovery system and a carbonization maintenance-solid waste aggregate generation system, and a gas outlet end (4) of the waste heat recovery system is connected with a gas inlet pipeline of the carbonization maintenance-solid waste aggregate generation system; gas flow controllers are arranged at the gas inlet end (5) and the gas outlet end (4) of the waste heat recovery system; and gas of the carbonization curing-solid waste aggregate generation system is discharged from the gas outlet pipeline (3). Industrial waste gas waste heat is used as a heating heat source, the internal temperature distribution of the equipment is uniform, the air permeability is good, the requirements of constant-temperature carbonization curing process conditions can be well met, the operation cost is low, and the carbonization curing, energy conservation and emission reduction effects are good. Meanwhile, the device is simple in overall design and convenient to operate, all parameters in the maintenance process can be accurately controlled, accurate maintenance can be achieved, and the overall maintenance efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of curing equipment, in particular to a CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste. Background Art

[0002] Phosphogypsum is produced during the preparation of phosphoric acid. It is a solid byproduct formed when sulfuric acid acts on phosphate ore. Its main component is CaSO4·2H2O, but it also includes some potentially harmful impurities such as phosphorus, fluorine, organic matter and silica. If these untreated byproducts are simply piled up, they will not only consume a lot of land, but may also pollute the soil, water sources and atmosphere. Similarly, steel slag is a solid waste produced in the steelmaking process. It is mainly composed of oxides formed by the oxidation of impurities in iron (such as silicon, manganese, phosphorus, and sulfur) and salts generated by their reaction with solvents. Unrecycled steel slag will not only pollute the environment, but also occupy land. Therefore, finding effective uses for phosphogypsum and steel slag is also of great significance to reducing land and environmental pollution.

[0003] In modern industrial production, waste gas and waste heat generated by high-temperature processes is a highly valued resource recovery area. Especially in the production process of products in the steel, building materials and other industries, the temperature of the discharged waste gas is usually between 100℃ and 200℃, which contains rich medium and low temperature waste heat resources. If these waste heat can be used reasonably, it can not only improve energy efficiency, but also help reduce carbon dioxide emissions in industrial processes. Using these medium and low temperature waste gas waste heat as a heat source for the production of low-temperature carbonized building materials meets the dual requirements of the carbonization curing process for a carbon dioxide content higher than 20% and a temperature control of 50-150℃. This move not only provides a new way to recover medium and low temperature waste heat, but also reduces the energy consumption of the carbonization curing process and promotes carbon emission reduction in industrial production.

[0004] Although the research and development and application of carbonization curing technology are becoming increasingly mature, many universities and enterprises have invested resources in research with the aim of applying this technology to the curing process of concrete and other building materials. However, at this stage, such technology is still mainly tested at the laboratory level, and the technology and equipment used in actual production are relatively limited.

[0005] In view of the limitations of existing technologies and the underutilized industrial waste heat resources, the utility model proposes an improved solution to improve the efficiency of solid waste and carbonization maintenance in the process of building materials production. Utility Model Content

[0006] The purpose of the utility model is to provide a CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste in response to the above-mentioned problems. The device uses the waste heat of industrial waste gas as a heating source, and the internal temperature distribution of the device is uniform, and the air permeability is good. The device can well meet the requirements of the constant temperature carbonization curing process conditions, and the operating cost is low, and the carbonization curing and energy saving and emission reduction effects are good. At the same time, the overall design of the device is simple, the operation is convenient, and all parameters of the curing process can be accurately controlled, which can not only accurately maintain, but also increase the overall curing efficiency.

[0007] The technical solution of the utility model is as follows:

[0008] A CO2 carbonization curing device suitable for steel slag-phosphogypsum solid waste aggregate generation, comprising a waste heat recovery system and a carbonization curing-solid waste aggregate generation system, wherein the gas outlet end of the waste heat recovery system is connected to the gas inlet pipeline of the carbonization curing-solid waste aggregate generation system; gas flow controllers are provided on the gas inlet and gas outlet ends of the waste heat recovery system; and the gas of the carbonization curing-solid waste aggregate generation system is discharged through the gas outlet pipeline.

[0009] Furthermore, the gas flow controllers on the air inlet and air outlet of the waste heat recovery system adjust the gas flow to be consistent.

[0010] Furthermore, a temperature detector and a CO2 concentration detector are also provided on the air intake end of the waste heat recovery system.

[0011] Furthermore, the waste heat recovery system also includes a heat exchanger, which connects the air inlet end and the air outlet end.

[0012] Furthermore, the carbonization curing-solid waste aggregate generation system is provided with a steel slag-phosphogypsum concentration detector.

[0013] Furthermore, the bottom plate of the carbonization curing-solid waste aggregate generation system is provided with a breathable bottom plate.

[0014] Furthermore, the carbonization curing-solid waste aggregate generation system is also provided with detectors, which include a CO2 concentration detector, a temperature and humidity detector, and a steel slag-phosphogypsum dosage detector.

[0015] Furthermore, the carbonization curing-solid waste aggregate generation system also includes an aggregate storage for storing aggregates that have not been carbonized and cured.

[0016] Furthermore, the aggregate generated in the carbonization curing-solid waste aggregate generation system is discharged from a discharge port.

[0017] Compared with the existing technology, the beneficial effects of the utility model are:

[0018] A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste. The device has a simple overall structure, reasonable design and simple operation, so that the curing process can reach an ideal curing state and improve work efficiency. The strength and durability of the aggregate are improved, making it more suitable for use as a building material. By using CO2 in industrial waste gas, greenhouse gas emissions are reduced, and the solid waste problems of steel slag and phosphogypsum are solved. The design of the entire process focuses on the efficient use of energy, reduces additional energy consumption, improves the overall energy efficiency of the system, and can subsequently use the flow accumulation results and CO2 concentration detection results to statistically analyze the carbon sequestration rate and CO2 utilization rate of the curing process. The utility model as a whole supports subsequent improvements and can adapt to a variety of environments and maintenance needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the overall structure of a CO2 carbonization curing device suitable for generating aggregates from steel slag-phosphogypsum solid waste.

[0020] Figure 2 The present invention is a schematic diagram of the structure of a waste heat recovery system of a CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste.

[0021] Figure 3 The present invention is a structural schematic diagram of a carbonization curing system of a CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste.

[0022] Figure numerals: 1-concentration detector, 2-discharge port, 3-air outlet pipe, 4-air outlet end, 5-air inlet end, 6-heat exchanger, 7-breathable bottom plate, 8-detector, 9-aggregate storage. DETAILED DESCRIPTION

[0023] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0024] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0025] See also Figure 1-3, a CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste, such as Figure 1 As shown, it includes a waste heat recovery system and a carbonization curing-solid waste aggregate generation system, the gas outlet end 4 of the waste heat recovery system is connected to the gas inlet pipe of the carbonization curing-solid waste aggregate generation system; the gas inlet end 5 and the gas outlet end 4 of the waste heat recovery system are both provided with a gas flow controller; the gas of the carbonization curing-solid waste aggregate generation system is discharged from the gas outlet pipe 3.

[0026] like Figure 2 As shown, the gas flow controllers on the inlet end 5 and the outlet end 4 of the waste heat recovery system adjust the gas flow to be consistent. According to the needs, the heat flow on the inlet pipe outside the waste heat recovery system is adjusted to enter the controller, and the inlet end temperature detector and the CO2 concentration detector are observed. When the temperature and CO2 concentration in the system meet the requirements, the outlet end flow controller is adjusted to keep the inlet end 5 and the outlet end 4 flow consistent.

[0027] The air inlet end 5 of the waste heat recovery system is also provided with a temperature detector and a CO2 concentration detector.

[0028] The waste heat recovery system further includes a heat exchanger 6 , which is connected to the air inlet 5 and the air outlet 4 .

[0029] like Figure 3 As shown, the carbonization curing-solid waste aggregate generation system is provided with a steel slag-phosphogypsum concentration detector 1.

[0030] The bottom plate of the carbonization curing-solid waste aggregate generation system is provided with a breathable bottom plate 7.

[0031] The carbonization curing-solid waste aggregate generation system is also provided with a detector 8, which includes a CO2 concentration detector, a temperature and humidity detector and a steel slag-phosphogypsum dosage detector.

[0032] The carbonization curing-solid waste aggregate generation system also includes an aggregate storage 9 for storing aggregates that have not been carbonized and cured.

[0033] The aggregate generated in the carbonization curing-solid waste aggregate generation system is discharged from the discharge port 2.

[0034] How it works

[0035] Before use, the steel slag and phosphogypsum are mixed and crushed to a suitable particle size, and evenly laid on the breathable bottom plate 7 of the carbonization curing-solid waste aggregate generation system. The waste heat recovery of industrial waste gas is turned on, and the waste gas enters from the air intake pipe of the waste heat recovery system, passes through the gas flow controller, temperature detector and CO2 concentration detector at the air intake end, and preheats the waste heat recovery system through the heat exchanger 6. Continuous air intake increases the heat of the system, and at the same time, the flow controller 4 at the air outlet end is adjusted to ensure that the flow rates of the two flow controllers are consistent. According to the conditions of carbonization curing, the CO2 concentration detector, temperature and humidity detector and steel slag-phosphogypsum dosage detector on the upper part of the carbonization curing-solid waste aggregate generation system are controlled to set the appropriate CO2 concentration, temperature, humidity and steel slag-phosphogypsum dosage. Solid waste generation and carbonization curing of aggregates are carried out in the carbonization curing-solid waste aggregate generation system. The curing environment is continuously monitored and adjusted to ensure that the reaction is complete. After the curing is continued for a specified period of time, the air inlet 5 and the air outlet 4 of the waste heat recovery system are closed, the discharge port 2 is opened and the aggregate is completely discharged. The system repeats the above operation and starts the next curing.

[0036] It should be noted that the carbonization reaction will produce water, and the mixed exhaust gas will carry away the water vapor. Therefore, the inlet and outlet gas flow rates during the curing process should not be set too small.

[0037] It should be noted that the concentration of the carbon dioxide mixed gas is controlled by the flow rate of air and pure carbon dioxide, and the proportion of carbon dioxide in the mixed gas is determined by the flow rate ratio.

[0038] It should be noted that industrial waste gas itself has a certain temperature. Using industrial waste gas for maintenance can take away more water vapor and make the maintenance effect better. The same result can also be achieved by heating the air.

[0039] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste, characterized in that: The invention comprises a waste heat recovery system and a carbonization curing-solid waste aggregate generation system, wherein the gas outlet end (4) of the waste heat recovery system is connected to the gas inlet pipeline of the carbonization curing-solid waste aggregate generation system; the gas inlet end (5) and the gas outlet end (4) of the waste heat recovery system are both provided with a gas flow controller; the gas of the carbonization curing-solid waste aggregate generation system is discharged through the gas outlet pipeline (3).

2. A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste according to claim 1, characterized in that: The gas flow controllers on the air inlet (5) and the air outlet (4) of the waste heat recovery system adjust the gas flow to be consistent.

3. A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste according to claim 1 or 2, characterized in that: A temperature detector and a CO2 concentration detector are also provided on the air inlet end (5) of the waste heat recovery system.

4. A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste according to claim 3, characterized in that: The waste heat recovery system further comprises a heat exchanger (6), wherein the heat exchanger (6) is connected to the air inlet (5) and the air outlet (4).

5. The CO2 carbonization curing device for aggregate generated from steel slag-phosphogypsum solid waste according to claim 1, characterized in that: The carbonization curing-solid waste aggregate generation system is provided with a steel slag-phosphogypsum concentration detector (1).

6. A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste according to claim 1 or 5, characterized in that: The bottom plate of the carbonization curing-solid waste aggregate generation system is provided with a breathable bottom plate (7).

7. A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste according to claim 6, characterized in that: The carbonization curing-solid waste aggregate generation system is also provided with a detector (8), which includes a CO2 concentration detector, a temperature and humidity detector and a steel slag-phosphogypsum dosage detector.

8. A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste according to claim 7, characterized in that: The carbonization curing-solid waste aggregate generation system also includes an aggregate storage (9) for storing aggregates that have not been carbonized and cured.

9. A CO2 carbonization curing device suitable for aggregate generated from steel slag-phosphogypsum solid waste according to claim 1, characterized in that: Aggregates generated in the carbonization curing-solid waste aggregate generation system are discharged from a discharge port (2).

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