Incinerator system for treating phenol-ammonia wastewater

Abstract

The utility model provides an incineration device system for treating phenol-ammonia wastewater. The incineration device system comprises an oil removal unit, an evaporator, an incineration unit, an energy recovery unit and a flue gas treatment unit which are connected in sequence, the energy recovery unit comprises a boiler and a preheating device which are connected in sequence; and a combustion-supporting air outlet of the preheating device is connected with the incineration unit. According to the device disclosed by the utility model, the communication sequence of the devices is reasonably set, so that oil removal, evaporation, incineration and flue gas treatment of the phenol-ammonia wastewater can be realized in a relatively short process, and clean flue gas meeting the pollutant emission standard is obtained; and meanwhile, efficient recycling of heat in the system is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater treatment, and relates to a treatment device for phenolic ammonia wastewater, in particular to an incineration device system for treating phenolic ammonia wastewater. Background Art

[0002] Coal itself contains moisture. When coal is heated and pyrolyzed, wastewater containing ammonia and phenol is generated, commonly known as phenolic ammonia wastewater. The phenolic ammonia wastewater participates in the circulating cooling of the coal pyrolysis gas, and the excess needs to be discharged from this system. The discharged phenolic ammonia wastewater is usually called surplus ammonia water, also known as phenolic ammonia wastewater. However, the phenolic ammonia wastewater discharged into the surplus ammonia water tank is usually called surplus ammonia water, and after coming out of the surplus ammonia water tank, it is called phenolic ammonia wastewater or directly called ammonia water.

[0003] The treatment of phenolic ammonia wastewater is a recognized difficult problem in the coal chemical industry. This kind of wastewater has a complex composition and contains a large number of refractory and highly toxic pollutants, such as organic pollutants such as benzene series, phenols, polycyclic aromatic hydrocarbons, nitrogen and oxygen heterocyclic compounds, as well as inorganic pollutants such as heavy metals. It is a typical highly polluted and highly toxic industrial wastewater. The main characteristics of the wastewater are as follows: 1. It contains a large amount of oils. It is known from experiments that in addition to heavy oils mainly composed of polycyclic aromatic hydrocarbons and light oils mainly composed of straight-chain hydrocarbons, it also contains a large amount of emulsified oils. 2. It contains high concentrations of phenols and a certain concentration of cyanide pollutants. These two pollutants have biological toxicity, can coagulate proteins, and will cause poisoning to water treatment microorganisms. 3. The biodegradability is poor. In addition to phenolic substances, the organic matter in the wastewater is mainly coal tar substances, as well as polycyclic aromatic compounds and heterocyclic compounds containing nitrogen, oxygen, and sulfur, which have the characteristics of high toxicity and poor degradation. 4. The ammonia nitrogen concentration in the wastewater is relatively high. 5. The wastewater has a relatively high chromaticity. Due to the wastewater containing various chromogenic groups and auxochromic group substances, the chromaticity of the wastewater is as high as tens of thousands of times.

[0004] At present, most of the processes such as advanced oxidation method, biochemical method, steam stripping method, membrane method, wet oxidation, resin adsorption, etc. are used for treatment, which have problems such as long process flow, large investment, high operation cost, and unstable operation. In addition, the main process adopted in domestic similar projects is the process of "oil removal + ammonia distillation + phenol removal + biochemical treatment + advanced treatment". However, this treatment process is suitable for semi-coke production enterprises with large production scale and large amount of production wastewater. And in the operation process of this process route, a large amount of chemical agents need to be added in the processes of oil removal, ammonia distillation, and phenol removal, which is difficult to ensure the normal operation of the subsequent biochemical unit. At the same time, the large construction investment, long construction period, and large floor area of this treatment process have always been problems that trouble coking enterprises.

[0005] In summary, it is necessary to provide a device system with a simple process and capable of effectively treating phenolic ammonia wastewater. Content of the Utility Model

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide an incineration device system for treating phenolic ammonia wastewater. By reasonably setting the connection sequence of the devices, the present utility model can achieve oil removal, evaporation, incineration, and flue gas treatment of the phenolic ammonia wastewater in a shorter process, and obtain clean flue gas that meets the pollutant discharge standards.

[0007] To achieve this purpose, the present utility model adopts the following technical solutions:

[0008] The present utility model provides an incineration device system for treating phenolic ammonia wastewater, and the incineration device system includes an oil removal unit, an evaporator, an incineration unit, an energy recovery unit, and a flue gas treatment unit that are connected in sequence;

[0009] The energy recovery unit includes a boiler and a preheating device that are connected in sequence;

[0010] The combustion air outlet of the preheating device is connected to the incineration unit.

[0011] In the present utility model, first, the light oil and heavy oil in the phenolic ammonia wastewater are efficiently separated through the oil removal unit; then, wastewater steam is obtained through the evaporator, flue gas is obtained through the incineration unit, and then the excess heat in the flue gas is recovered and utilized through the energy recovery unit to achieve heat recovery; finally, the flue gas is treated through the flue gas treatment unit to obtain clean flue gas that meets the pollutant discharge standards.

[0012] By reasonably setting the connection sequence of the devices, the present utility model can achieve oil removal, evaporation, incineration, and flue gas treatment of the phenolic ammonia wastewater in a shorter process, and obtain clean flue gas that meets the pollutant discharge standards; at the same time, the efficient recovery and utilization of the heat in the system are realized.

[0013] As a preferred technical solution of the present utility model, the content of sulfide in the phenolic ammonia wastewater < 2500 mg / L, for example, it can be 2400 mg / L, 2300 mg / L, 2200 mg / L, 2100 mg / L, 2000 mg / L, 1800 mg / L, or 1500 mg / L, etc., but not limited to the listed values, and other unlisted values within the numerical range are equally applicable;

[0014] The content of NH3 in the phenolic ammonia wastewater < 6000 mg / L, for example, it can be 5800 mg / L, 5600 mg / L, 5400 mg / L, 5200 mg / L, 5000 mg / L, or 4800 mg / L, etc., but not limited to the listed values, and other unlisted values within the numerical range are equally applicable;

[0015] The content of volatile phenol in the phenol-ammonia wastewater is < 5000 mg / L. For example, it can be 4800 mg / L, 4600 mg / L, 4400 mg / L, 4200 mg / L, 4000 mg / L, 3500 mg / L, etc., but is not limited to the listed values. Other unlisted values within the numerical range are equally applicable;

[0016] The content of total phenol in the phenol-ammonia wastewater is < 15000 mg / L. For example, it can be 14500 mg / L, 14000 mg / L, 13500 mg / L, 13000 mg / L, 12500 mg / L, 12000 mg / L, but is not limited to the listed values. Other unlisted values within the numerical range are equally applicable;

[0017] The content of COD in the phenol-ammonia wastewater is 38000 - 65000 mg / L. For example, it can be 38000 mg / L, 40000 mg / L, 45000 mg / L, 50000 mg / L, 55000 mg / L, 60000 mg / L, 65000 mg / L, but is not limited to the listed values. Other unlisted values within the numerical range are equally applicable;

[0018] The content of oil in the phenol-ammonia wastewater is 8000 - 12000 mg / L. For example, it can be 8000 mg / L, 9000 mg / L, 10000 mg / L, 11000 mg / L, 12000 mg / L, but is not limited to the listed values. Other unlisted values within the numerical range are equally applicable;

[0019] The content of SS in the phenol-ammonia wastewater is 300 - 3000 mg / L. For example, it can be 300 mg / L, 500 mg / L, 1000 mg / L, 1500 mg / L, 2000 mg / L, 2500 mg / L, 3000 mg / L, but is not limited to the listed values. Other unlisted values within the numerical range are equally applicable;

[0020] The pH of the phenol-ammonia wastewater is 8.5 - 9.5. For example, it can be 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4, 9.5, but is not limited to the listed values. Other unlisted values within the numerical range are equally applicable.

[0021] As a preferred technical solution of the present utility model, the oil removal unit includes a flocculation oil remover and a flotation oil remover connected in sequence.

[0022] In the present utility model, the purpose of the flocculation oil remover is to separate heavy oil in the phenol-ammonia wastewater; the purpose of the flotation oil remover is to separate light oil in the phenol-ammonia wastewater.

[0023] As a preferred technical solution of the present utility model, the incineration unit includes a burner and an incinerator which are connected in sequence.

[0024] In the present utility model, the function of the burner is to enable the full mixed combustion of raw coal gas, combustion-supporting air, and waste water steam; the function of the incinerator is to ensure that the combustion flue gas has a residence time of > 2 s at 1100 °C; the boiler is used to recover the heat of the high-temperature flue gas obtained after the waste water steam is incinerated in the incinerator.

[0025] As a preferred technical solution of the present utility model, the combustion-supporting air outlet of the preheating device is connected to the burner.

[0026] As a preferred technical solution of the present utility model, the preheating device is used to preheat the combustion-supporting air.

[0027] As a preferred technical solution of the present utility model, the preheating device includes a low-temperature air preheater and a high-temperature air preheater which are connected in sequence.

[0028] Preferably, the combustion-supporting air outlet of the high-temperature air preheater is connected to the burner.

[0029] Preferably, the burner is provided with a raw coal gas inlet.

[0030] As a preferred technical solution of the present utility model, the combustion-supporting air inlet of the low-temperature air preheater is connected to a combustion-supporting air blower.

[0031] In the present utility model, the combustion-supporting air is pressurized by the combustion-supporting air blower and then enters the low-temperature air preheater and the high-temperature air preheater in sequence to be heated to above 1100 °C;

[0032] More specifically, after the combustion-supporting air is heated to > 120 °C by the low-temperature air preheater, it is heated again by the high-temperature air preheater, avoiding the corrosion problem of the boiler caused by the low-temperature combustion-supporting air.

[0033] As a preferred technical solution of the present utility model, the flue gas treatment unit includes a economizer, a bag filter, an alkali scrubber, a flue gas heater, an induced draft fan, and a chimney which are connected in sequence.

[0034] In the present utility model, the economizer can reduce the flue gas temperature to below 200 °C, improve the efficiency of heat recovery, and is used to preheat the boiler water; the bag filter is used to remove particulate matter in the flue gas; the alkali scrubber is used to remove acidic gases (mainly sulfur dioxide in the flue gas) in the flue gas; the flue gas heater is used to dewhite the flue gas; the induced draft fan and the chimney are used to discharge the purified flue gas.

[0035] The system refers to an equipment system, a device system, or a production device.

[0036] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0037] (1) The process of treating phenolic ammonia wastewater by using the incineration device system provided by the present utility model is relatively short. After the wastewater is subjected to oil removal treatment and evaporation, it is directly incinerated, and then clean flue gas meeting the pollutant discharge standards is obtained through the flue gas treatment unit.

[0038] (2) By using the incineration device system provided by the present utility model, the recovery of heat in the flue gas by the boiler is realized, and the incineration temperature is raised to above 1100 °C only by using low calorific value waste gas.

[0039] (3) In the present utility model, by reasonably arranging the connection sequence of each device in the flue gas treatment unit, efficient cleaning treatment of the flue gas is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the incineration device system for treating phenolic ammonia wastewater provided by the present utility model;

[0041] Wherein: 1 is a flocculation oil separator, 2 is a flotation oil separator, 3 is an evaporator, 4 is a burner, 5 is an incinerator, 6 is a boiler, 7 is a high-temperature air preheater, 8 is a economizer, 9 is a bag filter, 10 is an alkali scrubber, 11 is a flue gas heater, 12 is an induced draft fan, 13 is a chimney, 14 is a combustion-supporting fan, and 15 is a low-temperature air preheater. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] It should be understood that in the description of the present utility model, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation of the present utility model.

[0043] It should be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "connected", "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0044] The technical solution of the present utility model will be further described below with reference to the drawings and through specific embodiments.

[0045] In a specific embodiment, the present utility model provides an incineration device system for treating phenolic ammonia wastewater as shown in Figure 1 which. The incineration device system includes an oil removal unit, an evaporator 3, an incineration unit, an energy recovery unit, and a flue gas treatment unit connected in sequence;

[0046] The energy recovery unit includes a boiler 6 and a preheating device connected in sequence;

[0047] The combustion air outlet of the preheating device is connected to the incineration unit.

[0048] The oil removal unit includes a flocculation oil remover 1 and an air flotation oil remover 2 connected in sequence; the incineration unit includes a burner 4 and an incinerator 55 connected in sequence; the combustion air outlet of the preheating device is connected to the burner 4; the burner 4 is provided with a raw coal gas inlet;

[0049] The preheating device is used to preheat the combustion air. The preheating device includes a low-temperature air preheater 15 and a high-temperature air preheater 7 connected in sequence; the combustion air outlet of the high-temperature air preheater 7 is connected to the burner 1;

[0050] The combustion air inlet of the low-temperature air preheater 15 is connected to a combustion air blower 14;

[0051] The flue gas treatment unit includes a economizer 8, a bag filter 9, an alkali washing tower 10, a flue gas heater 11, an induced draft fan 12, and a chimney 13 connected in sequence.

[0052] Example 1

[0053] This example provides an incineration device system for treating phenolic ammonia wastewater as shown in Figure 1 which. The incineration device system includes an oil removal unit, an evaporator 3, an incineration unit, an energy recovery unit, and a flue gas treatment unit connected in sequence;

[0054] The energy recovery unit includes a boiler 6 and a preheating device connected in sequence;

[0055] The combustion air outlet of the preheating device is connected to the incineration unit.

[0056] The oil removal unit includes a flocculation oil remover 1 and an air flotation oil remover 2 connected in sequence; the incineration unit includes a burner 4 and an incinerator 55 connected in sequence; the combustion air outlet of the preheating device is connected to the burner 4; the burner 4 is provided with a raw coal gas inlet;

[0057] The preheating device is used to preheat the combustion-supporting air. The preheating device includes a low-temperature air preheater 15 and a high-temperature air preheater 7 connected in sequence; the combustion-supporting air outlet of the high-temperature air preheater 7 is connected to the burner 1;

[0058] The combustion-supporting air inlet of the low-temperature air preheater 15 is connected to the combustion-supporting air blower 14;

[0059] The flue gas treatment unit includes a economizer 8, a bag filter 9, an alkali scrubber 10, a flue gas heater 11, an induced draft fan 12 and a chimney 13 connected in sequence.

[0060] Using the device system provided in this embodiment to treat phenol-ammonia wastewater, the treated flue gas can meet the relevant emission standards of GB18484 and GB31571;

[0061] The sulfide content in the phenol-ammonia wastewater is 2000 mg / L; the NH3 content is 5500 mg / L; the volatile phenol content is 4500 mg / L; the total phenol content is 14500 mg / L; the COD content is 50000 mg / L; the oil content is 10000 mg / L; the SS content is 2000 mg / L; pH = 9.

[0062] Example 2

[0063] The present embodiment provides an incineration device system for treating phenol-ammonia wastewater. The difference between the incineration device system and that in Example 1 is only that:

[0064] The low-temperature air preheater 15 is omitted in this embodiment.

[0065] Compared with Example 1, omitting the low-temperature air preheater 15 will cause the low-temperature combustion-supporting air to directly enter the high-temperature air preheater, thereby causing corrosion to the boiler.

[0066] Comparative Example 1

[0067] The present comparative example provides an incineration device system for treating phenol-ammonia wastewater. The difference between the incineration device system and that in Example 1 is only that:

[0068] The preheating device is omitted in this comparative example.

[0069] If this comparative example wants to incinerate the wastewater steam in the burner 4, additional heat needs to be supplemented to make the temperature in the burner 4 reach 1100 °C for incineration;

[0070] Therefore, compared with Example 1, the device system provided in this comparative example cannot realize the recovery and utilization of heat in the boiler.

[0071] Comparative Example 2

[0072] This comparative example provides an incineration device system for treating phenolic ammonia wastewater. The difference between the incineration device system and that of Example 1 is only that:

[0073] Evaporator 3 is omitted in this comparative example.

[0074] Compared with Example 1, omitting Evaporator 3 causes the incineration temperature in the incineration unit to only reach 700 - 900 °C, far from meeting the incineration requirement of 1100 °C, unable to achieve the full incineration of phenolic ammonia wastewater, and making the discharged flue gas unable to meet the emission standards.

[0075] In summary, the present utility model can achieve the removal of oil, evaporation, incineration of phenolic ammonia wastewater, and flue gas treatment in a shorter process by reasonably setting the device connection sequence, obtaining clean flue gas that meets the pollutant emission standards; meanwhile, the efficient recovery and utilization of heat in the system are realized.

[0076] The applicant declares that the above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model fall within the protection scope and the disclosure scope of the present utility model.

Claims

1. An incineration device system for treating phenolic ammonia wastewater, characterized in that, The incineration device system includes an oil removal unit, an evaporator, an incineration unit, an energy recovery unit, and a flue gas treatment unit that are connected in sequence; The energy recovery unit includes a boiler and a preheating device that are connected in sequence; The combustion air outlet of the preheating device is connected to the incineration unit.

2. The incineration device system for treating phenolic ammonia wastewater according to claim 1, wherein The oil removal unit includes a flocculation oil remover and a flotation oil remover that are connected in sequence.

3. The incineration device system for treating phenolic ammonia wastewater according to claim 1, characterized in that, The incineration unit includes a burner and an incinerator that are connected in sequence.

4. The incineration device system for treating phenolic ammonia wastewater according to claim 3, wherein, The combustion air outlet of the preheating device is connected to the burner.

5. The incineration device system for treating phenolic ammonia wastewater according to claim 3, characterized in that, The burner is provided with a raw gas inlet.

6. The incineration device system for treating phenolic ammonia wastewater according to claim 1, characterized in that, The preheating device is used to preheat the combustion air.

7. The incineration device system for treating phenolic ammonia wastewater according to claim 6, wherein, The preheating device includes a low-temperature air preheater and a high-temperature air preheater that are connected in sequence.

8. The incineration device system for treating phenolic ammonia wastewater according to claim 7, characterized in that, The combustion air outlet of the high-temperature air preheater is connected to the burner.

9. The incineration device system for treating phenolic ammonia wastewater according to claim 7, characterized in that, The combustion air inlet of the low-temperature air preheater is connected to the combustion air blower.

10. The incineration device system for treating phenolic ammonia wastewater according to claim 1, characterized in that, The flue gas treatment unit includes a economizer, a bag filter, an alkali scrubber, a flue gas heater, an induced draft fan, and a chimney that are connected in sequence.

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