DE202018004168U1 - Phosphor plant in air-technical construction - Google Patents

Abstract

Phosphoranlage in lufttechnischer execution, wherein
i. a separation stage (1) for phosphorus, P ₂ O ₅ as distillate in gaseous media,
ii. a separator (2) for distillate P ₂ O ₅ of gaseous media and
iii. a circuit (3) with distillate are provided in gaseous media.

Description

It is known about phosphorus P in sewage sludge, according to the sewage sludge regulation, to win this in the amount of 2 g P per EEC (population equivalent) and day out of the sewage sludge ash. For this separation of the phosphorus P from the ashes, further measures are necessary to first incorporate the phosphorus into the ashes after the evaporation of the P ₂ O ₅ , a thermochemical reaction at combustion temperatures, to obtain the raw material P with acids, wet-chemically from the ashes Separate raw material.

A process for the production of phosphorus (III) oxide by combustion of vaporous phosphorus with oxygen with the addition of nitrogen is known from the document DE 33 19 606 C2 according to which the cooling takes place in the third cooling stage with the addition of liquid phosphorus (III) oxide and liquid reaction mixture. For the liquefaction of a distillate of phosphorus P ₂ O ₅ from sewage sludge according to C01B 25/12 further measures are necessary.

Next is a dryer for sewage sludge according to the publication DE 29 43 528 C2 In Kyoto, in order to achieve higher calorific values, a flowable solid is indirectly heated as dry matter during drying without drying. Further measures are necessary to separate the distillate, P ₂ O ₅ .

Another method for recovering phosphorus from a fluidized bed combustion by thermochemical reaction with calcareous material is of the DE 10 2015 115 119 A1 according to which a phosphorus-enriched attrition with acid to achieve a phosphorus-enriched recyclable material is reacted. For the separation of the raw material P after combustion and the extraction of raw materials further measures are necessary.

A phosphorus recovery from ashes of a mono-combustion of the Werdhölzli sewage treatment plant according to the phos (4) life method is known from an ecological comparison of the production of phosphoric acid for a sewage treatment plant for 1,400,000 EWG according to Stefanie Hellweg. Further information: Prof. Stefanie Hellweg, Study on the Ecological Comparison of the Production of Phosphoric Acid, ETH Zurich, 2018. Further measures are necessary in the liquid waste incinerator (Werdhölzli) to capture evaporated phosphorus P ₂ O ₅ in ashes and after the thermochemical reactions a recovery / separation of phosphoric acid H ₃ PO ₄ from the reaction products at 1000 ° C, which are known to be acid-insoluble, to allow and to avoid the loss of phosphorus.

The specified in the protection claim 1 invention of a phosphorus plant in the extraction of phosphorus according to the prior art from sewage sludge ash is the problem at high water consumption with 254,000 m ³ / a to S. Hellweg, at a process uncertainty with the wet-chemical digestion and the loss of Phosphorus by acid-insoluble reaction products, a phosphorus plant for the thermal separation of phosphorus, propellant P ₂ O ₅ as a distillate to allow the recovery of the phosphorus as a raw material and a separation of the physical basis sewage sludge as distillate, and the production of P-containing Commercial products based on thermal processes. Another goal is the computational determination of the process data, which is possible in the context of thermal separation stages.

This problem is solved by the features listed in claim 1 protection, with a phosphorous plant in ventilation design, in which (i.) A separation stage for phosphorus, P ₂ O ₅ as a distillate in gaseous media, (ii.) A separator for distillate P ₂ O ₅ of gaseous media and (iii.) A circuit with distillate are provided in gaseous media and in particular (iiii.) An overflow valve is provided.

Advantageous developments and embodiments of the invention are possible by the, in the dependent claims 2 to 7 measures.

The advantages achieved by the invention are in particular that instead of a thermochemical treatment of the easily evaporable P ₂ O ₅ when burning and instead of thermochemical mixtures, a physical separation of distillate of P ₂ O ₅ in a separation stage is possible and the distillate in better purity the concentrate is evaporated. The particular distillate of the vaporous phosphorus can be condensed in separators in the embodiment of F28C 3/06 as a quench cooler and produced in higher purity.

Another advantage consists in the predictability of the separation stages performance in that instead of expensive experiments on the reaction equilibrium of the hot mixing processes, the thermal separation of the Distillates in known conditions, by sublimation at 362 ° C, is given in the separation stages; significant advantage: The calculation and use of software such as ASPEN.

Another advantage of treating the product P is that, in particular, phosphorus vaporized, P ₂ O ₅ instead of incineration with the sewage sludge and the formation of water- and acid-insoluble P compounds and instead of the loss of phosphorus in the thermal separation, a distillate of higher purity is obtained in a cycle, which is prepared for various products.

The main advantage: the apparatus list of the phosphor plant with a separation stage TU 100, a separator AB 101 (a-x), fan V 102 and the overflow valve UEV 103; Another advantage: the process described by the apparatus list.

A major advantage, instead of the consumption of large amounts of water (250,000 m ³ / year), in a separation stage for phosphorus, P ₂ O ₅ as a distillate and a cycle with distillate. Advantage: raw material extraction, emission-free. See example.

An advantageous embodiment of the invention is specified in protection claim 2. The development according to claim 2 makes it possible that with an overflow valve, which is provided, excess gases, N ₂ , H ₂ O and air are discharged from starting operations; Advantage: Setup of constant conditions.

An advantageous embodiment of the invention is specified in protection claim 3. The development according to claim 3 makes it possible, phosphorus P ₂ O ₅ , which is present in flowable solid, using the respective substances and sewage sludge, which are supplied as heat transfer agent in separation stages, as distillate P ₂ O ₅ by vaporization and sublimation in vapor form win; Another advantage: the purification of P.

An advantageous embodiment of the invention is specified in protection claim 4. The development according to claim 4 makes it possible to use separators, which are each provided in a different form in the circuit, for the production of different products of phosphorus in a simple manner.

An advantageous embodiment of the invention is specified in protection claim 5. The development according to claim 5 makes it possible to use separators, which are each provided in a pipeline for excess distillate, for the production of different products in a simple manner.

An advantageous embodiment of the invention is specified in protection claim 6. The development according to claim 6 makes it possible to ventilators, which are provided in the circuit, in each case to the necessary pressure gradient (delta) p of the circuit, in a simple manner to set. Advantage: detailed ventilation planning.

An advantageous embodiment of the invention is specified in protection claim 7. The development according to claim 7 makes it possible, separators, which are designed as Quench cooler according to F28 C 3/06 with separation stages, with free-flowing alkaline earths and cooled phosphoric acid H ₃ PO ₄ as a heat transfer medium for the production of various intermediate and final phosphorus products and for a Use heat recovery.

• 1 eine Phosphoranlage

An embodiment of the invention is illustrated in the drawing and will be described in more detail below. Show it:

• 1 a phosphorus plant

• ✓ fließfähiger Klärschlamm als Wärmetauschmittel 8 zuführbar ist,
• ✓ das Destillat von P₂O₅ durch Sublimation bei entsprechenden Temperaturen getrennt wird,
• ✓ eine Phosphorsäure H₃PO₄ als Rohstoff in dem Abscheider 2 gewonnen wird,
• ✓ die Wärme in dem Abscheider 2, in der Ausführung als Quench Kühler nach F28C 3/06, gewonnen wird.

A Phosphoranlage is as a flow diagram with apparatus in 1 represented by a heated separation stage 1 for the separation of distillate as P ₂ O ₅ from a flowable concentrate as a heat transfer medium of the separation stages, a separator 2 for distillate in gaseous media, a cycle 3 for gaseous media (N ₂ , H ₂ O) with distillate passing through the separation stage 1 and the separator 2 guided, a fan 4 and an overflow valve 5 in a discharge line 6 with further separators 7 , in aerodynamic design, is executed in such a way that

• ✓ flowable sewage sludge as a heat transfer medium 8th can be fed
• ✓ the distillate of P ₂ O _{5 is} separated by sublimation at appropriate temperatures,
• ✓ a phosphoric acid H ₃ PO ₄ as raw material in the separator 2 is won,
• ✓ the heat in the separator 2 , in the version as Quench cooler according to F28C 3/06 won.

In addition to the above separation of the phosphorus from flowable sewage sludge are other uses of the phosphorus plant for separation / purification and recovery of a purified phosphoric acid H ₃ PO ₄ in the task of crude acid in the separation stage 1 possible, which are not listed in detail. It is important that raw materials in different forms as P ₂ O _{5 are} thermally separated as distillate, so that the advantages of the invention, namely the extraction of raw materials as phosphoric acid H ₃ PO ₄ to C01B 15/18, which is purified, are achieved.

Further advantages are shown in the calculation using the example of the treatment plant Werdhölzli, with the following data: P - nominal quantity 800 kg P / year Quantity at 8,000 h / year (M = 62) 100 kg P / h Mol amount P 100/62 1.61 MOL / h Chemical composition P ₂ O ₅ x 3 H ₂ O P-3 hydrate MOL - Quantity: P-3 hydrate 1.61 x 4 6.45 MOL / h Gas amount 6.45 x 22.41 144 Nm ³ / h Phosphorus distillate at 200 ° C: 144 * 573/273 250 m ³ / h TU area, separation level with F-factor = 1 1 m ² Gas volume in the circulation at F-factor = 1 3,600 m ³ / h dilution factor 3,600 / 250 14.4: 1 TU - diameter at 1 m ² 1.13 m Ø

Further advantages are shown by the extraction of the P-containing raw material. End product: phosphoric acid H ₃ PO ₄ by Molecular weights: ✓ acid 198 kg / MOL ✓ P-phosphor 62 kg / MOL ✓ Factor 3.3 Technical data of the product for Antirust / descaling density 1.9 kg / liter Trade price, 85% acid 4,2 € / liter Raw material data for Werdhölzli P amount 800 tp / year Crude acid 100% 800 t * 3.3 2,640 t of acid volume 1,320 m ³ / year Crude acid - 85% 1,320 / 0,85 1,552 m ³ / year Proceeds: end user 1,552,000 * 4,19 € € 6,506,000 In Zurich, at € 0.9 / CHF 6,506,000 / 0.9 7,200,000 CHF / year Proceeds per inhabitant 7,200,000 / 1,400,000 5.16 CHF / year Nominal data at 2 g P / inhabitant: Werdhölzli phosphorus 2 g P * 1,400 / 24 h 116 kg P / h revenues 7,200,000 CHF * 1.16 CHF 8,350,000 / year Proceeds per inhabitant CHF 5.16 * 1.16 5.98 CHF / year

1. (1) Phosphoranlage für Rohstoffe und Endprodukte,
2. (2) thermische Aufbereitung und Reinigung der P-Säure H₃PO₄,
3. (3) Produktion der P-Rohstoffe ohne Chemikalien, mit Wärmerückgewinn,
4. (4) berechenbar und planbar z.B. mit ASPEN,
5. (5) Erhöhung des Heizwertes Hu von Klärschlamm.

Achieved benefits

1. (1) phosphorus plant for raw materials and final products,
2. (2) thermal treatment and purification of the P-acid H ₃ PO ₄ ,
3. (3) Production of P raw materials without chemicals, with heat recovery,
4. (4) calculable and plannable eg with ASPEN,
5. (5) Increase of the heating value Hu of sewage sludge.

LIST OF REFERENCE NUMBERS

1 -

Separation stage, heated

2 -

Separator, cooled

3 -

Circulation for gaseous media

4 -

fans

5 -

overflow

6 -

outflow

7 -

Separator (a-c)

8th -

Heat transfer agent of the separation stage 1

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3319606 C2 [0002]
• DE 2943528 C2 [0003]
• DE 102015115119 A1 [0004]

Claims (7)

Phosphoranlage in lufttechnischer execution, where i. a separation stage (1) for phosphorus, P ₂ O ₅ as distillate in gaseous media, ii. a separator (2) for distillate P ₂ O ₅ of gaseous media and iii. a circuit (3) with distillate are provided in gaseous media. Phosphoranlage according to the above protection claim, wherein an overflow valve (5) is provided. Phosphor plant according to one of the preceding claims, wherein phosphorus P ₂ O _{5 is provided} in a flowable solid for separation. Phosphor plant according to one of the preceding claims, wherein separators (8) are provided in the circuit (3). Phosphor plant according to one of the preceding claims, wherein separators (7) are provided in a pipeline (6) for excess distillate. Phosphor plant according to one of the preceding claims, wherein a fan (4) in the circuit (3) is provided. Phosphor plant according to one of the preceding claims, wherein the separators (2, 7) are provided as quench cooler with separation stages.

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